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What are the types of wood?

 (1) Classification of trees Trees are divided into coniferous and broad-leaved trees. Coniferous trees, such as Chinese fir, Korean pine, white pine and yellow flower pine, have slender leaves, most of which are evergreen trees. Its trunk is straight and tall, texture straight, wood is soft, easy to process, it is also known as soft wood. Its apparent density is small, the strength is high, the expansion shrinkage deformation is small, is the main material in the construction engineering. Broad leaved trees, such as birch, elm, Fraxinus mandshurica, etc., have broad leaves and are mostly deciduous trees. The straight part of the trunk is short, and the wood is hard, so it is difficult to process, so it is also called hard (Miscellaneous) wood. Its apparent density is large, easy to expand and shrink, warpage, cracking, commonly used as interior decoration, secondary load-bearing components, plywood, etc. (2) Classification of wood According to the different uses and processing, wood can be divided into three types: raw wood, log, common sawn timber, special timber and wood-based artificial board. The original strip refers to the timber that has been peeled, roots and treetops, but has not been processed into the specified wood type according to a certain size. Log is a kind of wood with specified diameter and length which is processed from the original strip according to a certain size. It is divided into direct use log and processing log. Direct use of logs for roof trusses, purlins, rafters, piles, poles, etc; The processing logs are used for sawing common sawn timber and plywood. Ordinary sawn timber refers to the wood that has been processed and sawn into timber. Where the width is 3 times or more than 3 times the thickness, it is called plate; Less than 3 times is called Fang material. The length of common sawn timber is 1-8 m for coniferous trees and 1-6 m for broad-leaved trees. Length grading: 0.5m for more than 2m and 0.2m for less than 2m in Northeast China; In other areas, it is graded as 0.2m. Wood properties and characteristics Manglietia fordiana Origin: China Macrostructure characteristics: the difference of border forest is obvious. Sapwood grayish yellow, heartwood small, light yellow brown. The texture is straight, the structure is fine and the material is light. The ring is obvious, narrow and uniform, and there are thin lines in the ring boundary. Porous materials. There are a little more and smaller holes in the tube, and the distribution is uniform. The wood rays are less and finer, and the distribution is uneven. The wood ray stripes on the radial surface are not obvious. Wood properties: air dry density is 0.437g/cm & sup3;, Light. It is easy to dry and shrink. The heartwood is resistant to termites and insects. Cinnamomum camphora Origin: China The difference between heartwood and sapwood is obvious or slightly obvious. Sapwood broad, yellowish brown to grayish brown, heartwood reddish brown or dyed with dark stripes. The wood has a typical camphor smell. It is glossy, with oblique or interlaced texture and fine structure. The ring is obvious with uneven width. The early wood band is wider and the late wood band is dark. Loose hole to Hetian porous material. From early wood to late wood, the tube hole gradually became smaller. The axial parenchyma is fasciculate and a few are pterygoid; The wood ray is fine and the radial surface is mottled. Wood properties: air dry density 0.535g/cm & sup3;, Light. Drying is easy to warpage and diameter crack, dry shrinkage. It is not easy to rot and moth, durable and smooth. nanmu Origin: China The difference between heartwood and sapwood was not obvious. The wood is yellowish brown with a greenish tinge. It is glossy and fragrant, with oblique texture and fine structure. The growth rings are obvious. There are dark brown lines on the rim. Porous materials. The tube hole is fine. The axial parenchyma is ring tube bundle. The wood ray is thin, narrow and uneven, and the radial surface is shot through the stripes fine and dense. Wood properties: air dry density is 0.61g/cm & sup3;, Medium. It has warping phenomenon when drying, durable, easy processing and smooth section; The paint and adhesion are good. Dalbergia hupeana Origin: China The difference between heartwood and sapwood is not obvious, and the wood is light yellow brown. The annual ring is slightly obvious and uneven in width. In loose porous materials, the tube holes are slightly small, small to medium, and most of them are distributed separately. The axial parenchyma is rich, paratubular, pterygoid, off tubular, zonal, wheel boundary, wood ray is fine, slightly small, light color. The surface of the string is wavy. Wood properties: air dry density 0.987g/cm & sup3;, Heavy. Drying is slow. It is resistant to corrosion but easy to be damaged by insects. The material is hard, the cutting is difficult and the section is smooth. Wear resistant, impact resistant. Sophora japonica Origin: China Sapwood is narrow, yellowish white and dark gray brown. The texture is straight, the structure is slightly thick, and the growth rings are obvious. Usually the windows are not even. Ring hole material. The pores of early wood are medium to slightly larger, usually 2-3 rows wide, and brown gum is often found in heartwood, while the pores of late wood are slightly smaller, or round or short tangent. Wood rays are thin and few, light in color. Wood properties: air dry density 0.722g/cm & sup3;, Medium, wear-resistant, but sapwood is easy to be moth eaten, easy to cut, smooth section. Robinia pseudoacacia Origin: China The difference between heartwood and sapwood is obvious; The heartwood is dark yellowish brown, with glossy wood, straight grain, thick structure, obvious ring, and usually wide and uneven. Ring hole material. The pores of the early wood are medium to large, 2 to several rows wide, dense, and completely filled with infill in the heartwood. The pores of late wood are small and few, the middle part is scattered, and the edges are arranged in a group or laterally connected into intermittent concentric belts. The axial parenchyma is rich, paratracheal ring tubular, pterygoid, poly pterygoid, wood ray to medium, radial surface ray stripes are not obvious. Wood properties: air dry density 0.792g/cm & sup3, The heartwood is durable, moisture resistant and fire-resistant, sapwood is not rotten and resistant to insects. It is difficult to process and cut, and the section is smooth. The paint and adhesion are very good. Ormosia hosiei Origin: China The difference between heartwood and sapwood is very obvious. Sapwood is light yellow brown; The heartwood is dark brown with yellow (chocolate color), with oblique texture, medium structure and luster. The wood rays are fine, slightly visible to the naked eye, and there are ripples on the chord surface. The growth rings are not obvious. Porous materials. Tube holes are small, visible to the naked eye, single or multiple tube holes (mostly 2-3). There is white sediment in the tube hole, and the axial parenchyma is rich, which is obvious under the naked eye. Properties: hard weight, air dry density 0.742g/cm & sup3;, Drying is not easy, sapwood and heartwood chord shrinkage difference is big, often crack at the junction of heartwood, sapwood is resistant to decay, but sapwood is easy to be moth eaten. Wood is easy to process, easy to cut, good adhesion and paint properties. Strong nail holding power. Liquidambar formosana Origin: China The difference between heartwood and sapwood was not obvious. The wood is grayish brown to grayish red. Sapwood is easy to turn green, with crisscross texture and fine structure. The growth rings are not obvious. Porous materials. The holes are small and evenly distributed, and the wood rays are fine. In the cross section, the rubber channel of the axial injured tree is chord line and often contains white sediment. Wood properties: air dry density 0.588g/cm & sup3;, Therefore, it must be dried slowly and not resistant to decay. The heartwood is easy to rot when standing, and the sapwood is easy to change color after cutting; Rotten wood has a dark "boundary". It's not easy to split. Paint coloring and bonding properties are good. Alnus cremastogyne Origin: China The difference between heartwood and sapwood is not obvious. The wood is yellow and reddish brown after a long time. The texture is straight. The structure is thin and loose. The ring boundary is in the form of thin line and wave. The number of pipe holes is large and small. It is evenly distributed, single or in 2 to several diameter rows. There are two kinds of wood rays: broad ray and narrow ray. On the radial plane, the broad ray stripes are slightly obvious, slightly the same color as the wood, and often with pith spot. Wood properties: light air dry density. It is easy to dry without excessive warping and cracking, and easy to set shape after drying. It is easy to be treated with anti-corrosion, but it is not resistant to corrosion. The wood section must be sawn in time, otherwise it is easy to produce green brown color change. The paint and adhesive properties are good. Quercus acutissima Origin: China The difference between heartwood and sapwood is obvious. Sapwood grayish brown or dark brown, slightly wider. Heartwood reddish brown or chestnut brown. The wood is glossy. The texture is straight or oblique, the structure is thick, the ring is obvious and uneven. Ring hole material. The diameter of the early wood tube is large to very large, with 1 to several series, and there are many infilling bodies. The late wood has small pores, row of diameter or flame, light color. There are abundant axial parenchyma, ring tube type and strip off tube. There are two kinds of wood rays: wide and narrow. The former is very wide and has beautiful and obvious ray markings on the radial surface. Wood properties: air dry density 0.93g/cm & sup3;, Heavy. It is not easy to dry and easy to produce radial crack and warpage. The wood has medium corrosion resistance and wear resistance. The paint and bonding properties are good. Oak (Quercus mongolica) Origin: China The difference between heartwood and sapwood is obvious. Sapwood yellowish white with brown, heartwood brown to dark brown, sometimes slightly yellow. It's glossy. The longitude and latitude are straight or oblique, and the structure is thick. The ring is very obvious and wavy. Ring hole material. The pores of late wood are small to very small, and most of them are arranged in a radial pattern. There is an intrusive body. The axial parenchyma is tubular and detached. There are two kinds of wood rays: broad ray and narrow ray. The former is few in number, light in color, wide in diameter, and glossy in ray, forming extremely obvious stripes. Wood properties: air dry density is 0.766 g / cm & sup3;, Heavy, difficult to dry, easy to warp and crack, water resistant, wear-resistant. The nail holding force is large, the paint coloring performance is good, and the adhesion is not easy. Juglans regia` Origin: China The difference between heartwood and sapwood is obvious. Sapwood is light yellowish brown with gray color; Heartwood red brown color with wood, even with dark brown, often with dark stripes, long dew in the air is chocolate color. The texture is straight or oblique, the structure is slightly fine, glossy, and the ring boundary is microwave-shaped. It is a kind of porous material. The tube hole is small and visible to the naked eye. The pores of early wood tubes are clear and slightly annular; It gradually decreases to the outer edge of the ring. Most of the tube holes are single or multiple, with radial or oblique rows, and a few contain infilling bodies. The wood rays are thin and numerous, I am shallow, and can be seen with naked eyes, and a few of them contain intrusive bodies. Wood rays are thin and numerous, light in color, visible to the naked eye, and ray stripes on the radial surface. Properties: the material is slightly hard and heavy, and the density is 0.672g/cm & sup3;, The color is beautiful; Drying is slow, stable after drying, no deformation. In the process of drying, a little inattention will result in splitting, wear resistance, good paint and adhesive properties. Engelhardtia roxburghiana Origin: China The difference between heartwood and sapwood is obvious to slightly obvious. The wood is grayish brown to light reddish brown, beautiful in color, straight or oblique in texture, cumbersome in structure, slightly obvious in annual rings and wide in width. From scattered hole to loose hole material, the pipe hole is small; The early wood tube holes are easy to be seen by naked eyes. Multiple tube holes (2 to several) are common, radial or oblique. The axial parenchyma is well developed and mainly linear in the detached segment. The wood ray is fine, slightly visible to the naked eye, and there are ray stripes on the radial surface. Properties: the material is slightly light, and the density is 0.569g/cm & sup3;, Drying is not difficult, less cracking and no deformation after drying. Wood is elastic and easy to process. In the paint properties, the adhesive force is good, the nail holding force is medium, but it does not split. Pterocarya stenoptera Origin: China The difference between heartwood and sapwood is not obvious, and the wood is light brown and yellowish. The wood is glossy, the texture is often interlaced and the structure is medium. Ring slightly distinct, wide. Semi porous to loose porous. The tube hole is slightly small to medium. It is easy to see under the naked eye. Axial parenchyma can be seen under magnifying microscope, which is mainly tangential (light color, thin and many) off the tube, showing intermittent chord line. The wood rays are fine and clear under the microscope, and the wood ray stripes on the radial surface are visible. Material properties: the material is soft and the density is 0.386g/cm & sup3;, When drying, it is easy to warp and not resistant to corrosion. The paint and adhesive properties are good. The nail holding state is not strong, but it does not split. Casuarina equisetifolia Origin: China The difference between heartwood and sapwood was not obvious or slightly obvious. Sapwood is broad and reddish brown. The heartwood is narrow and reddish brown. The wood has turbulent texture, oblique to crisscross, fine structure, and the ring is not obvious to slightly obvious. Porous materials. Most of the pores are scattered or oblique in diameter, and the axial parenchyma is well developed. Off tube banding. Wood rays are fine. The radial surface ray pattern is visible. Wood properties: air dry density is 1.043g/cm & sup3;, It's heavy. The material is strong and strong. The wood is difficult to dry and crack seriously. In the south, without antiseptic treatment, it is very easy to rot and moth. Ulmus propinqua Origin: China Sapwood is narrow, dark yellow, and heartwood is dark purple and grayish brown. The wood texture is straight and the structure is rough. The annual ring is very obvious, the width is extremely uneven. Ring hole material. The hole of early wood tube is big. The late wood tube holes are small to very small, and they are arranged in discontinuous waves along the annual rings. Axial parenchyma is not easy to see. The wood rays are thin and few, and they are evenly distributed. Horizontal or spot ray stripes can be seen on the radial surface. Wood properties: air dry density is 0.59g/cm & sup3;, Medium. It is difficult to dry and easy to ring crack and warpage. It is not resistant to corrosion and preservatives are easy to inject. Ulmus pumila Origin: China Sapwood is yellow brown and heartwood is dark reddish brown. The wood is glossy. The texture is straight and the structure is thick. The ring is obvious, narrow to very wide, slightly wavy. A few of them contain infilling bodies. The latewood tube hole is very small, in the form of multiple tube holes and tube hole clusters, forming intermittent tangent shape, axial thin-walled tissue ring tube, usually around the latewood tube hole wavy band. Wood rays are few, fine to very fine. Wood properties: air dry density is 0.639g/cm & sup3;, Medium. It is difficult to dry, big shrinkage, easy to warp and crack, strong durability and easy anti-corrosion treatment. Coloring and paint properties are good. Bonding is easy. Zelkova schneideriana Origin: China The difference between heartwood and sapwood is obvious. Sapwood broad, yellowish brown or reddish brown, heartwood reddish brown. It has luster, straight texture, fine to medium structure, obvious and uneven ring, and significant difference between early and late wood. Ring hole wood, early wood, large tube hole. It contains red brown gum. Late wood has small holes, oblique, tangent or wavy. The axial parenchyma is paratubular. In the wood ray, the radial surface ray pattern is obvious. Wood properties: air dry density is 0.81g/cm & sup3;, Heavy, difficult to dry, easy to crack due to improper drying, strong durability and easy anti-corrosion treatment. The paint and adhesive properties are good. Schima superba Origin: China The difference between heartwood and sapwood was not obvious. Wood yellowish brown to reddish brown, glossy. The texture is straight or oblique, and the structure is fine. The ring is slightly obvious, and there is dark late wood band in the ring boundary. Porous materials. The tube holes are many and small, most of them are single and evenly distributed, and the axial parenchyma is not seen. The wood ray is very thin, and the radial surface has fine brown red wood ray stripes. Wood properties: air dry density is 0.623g/cm & sup3;, Medium. It is easy to crack and dry easily. The decay resistance of wood is weak. It is easy to process, with medium holding force, but easy to split. The paint and adhesion are good. Phellodendron amurense Origin: North Korea, far east of Soviet Union and Japan The difference between heartwood and sapwood is obvious. Sapwood is yellow white with gray color, very narrow, generally 2-5mm; Heartwood dark chestnut brown. The texture is straight, the structure is thick and glossy. The material color and pattern are very beautiful. It has a bitter taste. The ring is obvious, narrow and even. Ring hole material. The diameter of the early wood tube is medium to slightly larger, which is clear under the naked eye. Wood rays are fine to very fine, few in number, slightly visible to the naked eye, light in color. Properties: the material is light and soft, and the density is 0.499g/cm & sup3;, The paint and adhesive properties are good, the nail holding force is medium, and it is not easy to split. Ailanthus altissima Origin: China The difference between heartwood and sapwood is slightly obvious. Sapwood is yellowish white and heartwood is light yellowish brown. The texture is straight, the structure is thick, the wood has silk light, and the taste is slightly bitter. The ring is distinct, wide and even. Ring hole material. The pores of early wood tubes are large and obvious to the naked eye. Containing gum; The holes of latewood are small and few, which can not be seen by naked eyes. Wood ray is few, slightly wide to fine, the former is obvious under the naked eye, the color is light, the radial surface ray speckle is visible, the chord surface ray is clear. Wood properties: the wood weight is medium, the density is 0.637g/cm & sup3;, It is easy to dry. If it is not handled properly, warpage and small cracks will occur occasionally; It's not resistant to rot and turns blue. Melia azedarach Origin: China The difference between heartwood and sapwood is obvious. Sapwood yellow white, very narrow; Heartwood purplish brown to red. The texture is straight or oblique, the structure is thick and glossy, the annual ring is obvious, very wide and uneven. Ring hole material. The diameter of early wood tube hole is medium, and the inner eye is easy to see. It contains reddish brown gum; There are a few holes in the late wood tube, very small to small, visible to the naked eye. Wood rays are fine, light color, visible to the naked eye; There are ray marks on the radial surface. Wood properties: the wood weight is medium, the density is 0.6g/cm & sup3;, The sapwood is easy to be damaged by borers. The wood is easy to process and cut, and the section is smooth. Pistacia chinensis Origin: China The difference between heartwood and sapwood is obvious. Sapwood grayish yellow or grayish brown, broad, heartwood yellowish brown, exposed to the atmosphere is dark brown, in the longitudinal plane sometimes with ginger yellow stripes. The texture is straight or oblique, the structure is fine and glossy. The ring is obvious, slightly wide and uneven. Ring hole material. The pore size of early wood tube is medium and can be seen by naked eyes. There are a lot of late wood tube holes, few of which can be seen under a magnifying glass. The wood ray is fine, visible to the naked eye and light in color; There are ray marks on the radial surface. Properties: the material is hard and heavy, and the density is 0.764g/cm & sup3;, It is easy to dry, but easy to produce radial splitting; Strong toughness, easy to dry bending. Acer mono Origin: Soviet Union, North Korea, Japan The difference between heartwood and sapwood is not obvious. The flesh of wood is red, and there are often grayish purple pseudoheartwood with green spots. The texture is straight, the structure is fine and glossy. The pith spot is obvious. The ring is slightly obvious, narrow and uniform, and the boundary between rings is dark and thin. The rim is angular and slightly spider like. Porous materials. The wood rays are fine, light in color and clear under the naked eye. On the radial surface, the ray pattern is obvious and beautiful; The chordal surface is short linear and obvious under the magnifying glass. Wood properties: the wood is slightly heavy and hard, with a density of 0.709g/cm & sup3;, Wood drying is slow and often cracked, but the phenomenon of warping is not serious; The corrosion resistance is medium and it is difficult to inject preservative. High mechanical strength, high elasticity and wear resistance. Fraxinus mandshurica Origin: China The difference between heartwood and sapwood is obvious. Sapwood yellow white, narrow; The heartwood is grayish brown. The texture is straight, the pattern is beautiful, the structure is thick and glossy. The growth rings are obvious and uniform in width. Ring hole material. The pores of the early wood tube are medium to large and obvious to the naked eye. The diameter of the late wood tube is very small, which can be seen under the magnifying microscope. The wood ray is fine and can only be distinguished by naked eyes. Wood properties: the wood is slightly heavy and hard, and the density is 0.686g/cm & sup3;, It is not easy to dry and shrinkage, and easy to produce warping and cracking defects; It is more resistant to corrosion and water. The material is tough and has good bending resistance. The paint and bonding properties are good. Shorea pclysperma Origin: Philippines Sapwood is yellow or grayish brown, narrow; The heartwood is reddish brown to dark reddish brown with purple, and the growth ring is not obvious. However, due to the dry and wet seasons, there are unclear whorls, crisscross texture, beautiful banded pattern, medium to thick structure, loose porous material, large pipe hole, very clear to the naked eye, and evenly distributed with infilling body. The rays of wood are very thin, which are barely visible on the chord surface under the naked eye. Wood properties: general dry condition, medium durability. Pentacme contorta Origin: Philippines The difference between heartwood and sapwood was not very obvious. Sapwood turned to light gray brown after yellowish white; Heartwood pale gray to yellowish brown with peach color. The axial parenchyma is not visible to the naked eye, but can be seen under the magnifying microscope. The paratubular type is sparse, short wing and chordal banded, and the off tube type is scattered or banded around the tree path. Properties: the material is light to hard, and the density is 0.38-0.53g/cm & sup3;, It is characterized by slow drying, low durability, easy processing, general sawing, good planing performance and good adhesion. Swietenia mahagoni Origin: West Indies, South America, Cuba Sapwood is white to light yellow; The heartwood is light reddish brown to reddish brown to reddish red with silk luster. It is beautiful and crisscross in texture, or with wavy banded pattern. Its structure is slightly thick and dense. No special smell, porous material. The tube hole is visible to the naked eye, evenly distributed, sensitive and independent. The tube hole contains white substance or gum, and the catheter is visible to the naked eye. The wood rays are clear under a magnifying glass. Properties: the material is moderately hard and soft, and the air dry density is 0.60-0.68g/cm & sup3;, The absolute dry density was 0.55g/cm & sup3; About, easy to dry, not easy to crack and warp. Caesalpina sappan Origin: Vietnam, Myanmar, India The heartwood is fresh and orange red, and turns to deep auspicious red when exposed to the atmosphere; Sapwood is narrow, grayish white, straight texture, fine and uniform structure. It has a slight aroma when it is raw, but no obvious smell after drying. The wood in radial section is glossy. Porous materials. Growth rings distinct, slightly broad, usually uniform. The tube hole is small and visible to the naked eye. Wood properties: less warpage after drying, cracks easily occur if the drying is improper. High durability. The material is very hard and heavy, and the density is 0.95g/cm3. After wood processing, the planed surface is very smooth. Pterocarpus santalinus Origin: Mysore state, southern India The difference between sapwood and heartwood is obvious. Sapwood is narrow and white, and changes rapidly from sapwood to heartwood; The newly cut heartwood is orange red. After a long time, it becomes red grape wine color, which is purple black or almost black. It is glossy, oblique in texture, cumbersome in structure, compact in section and loose in porosity. The tube hole is medium to small or few, barely visible to the naked eye. There is no infilling body in the pipe hole, and most of them contain red brown gum or white sediment or no. the wood ray is very fine, and it is not clear and slightly dense under the magnifying glass. Wood properties: it is difficult to dry, slow, but less cracking, heartwood has immunity to tree rot fungi, termites and other pests, and has strong durability, so it does not need antiseptic treatment in use. The wood is tough. The wood is tough, hard and hard. Oblique texture. Santalum album Origin: India, Southeast Asia, Australia Sapwood is white, odorless and heartwood. It is light yellowish brown when it is newly cut, dark brown when exposed to the atmosphere, and dark reddish brown after a long time. The wood is fragrant and fragrant. This kind of special fragrance will not disperse for thousands of years. It has no special taste, and occasionally presents weak wavy texture or rare bird eye pattern on the radial section, with extremely fine and uniform structure. Porous materials. The wood rays are very thin and can be seen under a magnifying glass. Properties: the material is fine and heavy, and the density is 0.92g/cm & sup3; when the moisture content is 12%;, The texture is straight or slightly wavy and dense. The drying is slow and the durability is strong. Diospyros ebemum Origin: India, Sri Lanka Sapwood is white or yellowish white, wide. The heartwood is dark jade with light black stripes. After the wood is polished, it has black metal luster, the processing surface is hard and smooth, the texture is irregular or wavy, the structure is very fine, dense and uniform, without special smell, the wood ray is very fine, and the heartwood is a thin white band. Properties: the material is dense, especially hard and heavy. The air dry density is 1.16g/cm & sup3;, It is not easy to dry. It is easy to crack at the end or surface during the drying process. It has strong durability and immunity to pink beetle. Teak (Tectona grandis) Origin: India, Malaya, Myanmar and Thailand The difference between heartwood and sapwood is obvious, sapwood is light yellow brown; The heartwood is golden yellow and becomes dark yellowish brown over a long period of time. In dry growing areas, the heartwood is mostly brown in longitude and latitude. The chord surface is parabolic pattern. The wood is glossy. The new wood has a slight pungent smell, no taste, and a greasy feeling. There is a touch of grease on the pomelo wood. The texture is usually straight, but in the same production area, there are also interlaced textures. The structure is medium to coarse, and the ring hole wood has obvious growth rings, Very wide, uneven. There are many rays in wood, which can be seen under the naked eye. Wood properties: the density of teak from Myanmar is 0.60g/cm & sup3;. The drying condition of wood is good, and it is necessary to cover the wood when it is dried naturally to prevent it from drying too fast; The wood color is easy to change, but the color after drying is the same. It has strong corrosion resistance, strong corrosion resistance, and is difficult to be treated. Sapwood is easy to be damaged by insects, but heartwood has strong resistance to termites and wood rotting organisms in the sea. It has good mechanical properties and corrosion resistance.
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