Performance and use of tool steel
T7, T7A sub-eutectoid steel. Has good plasticity, toughness and strength, and a certain hardness, can withstand shock and impact loads, but poor cutting ability. Used to manufacture tools that are not subject to impact load, and require appropriate hardness and wear resistance, and good toughness, such as forging dies, chisels, hammers, punches, metal shears, reamers, steel stamps, woodworking Tools, pneumatic tools, machine tool tops, fitter tools, drilling tools, blunt surgical instruments, etc.
T8, T8A eutectoid steel. When quenching and heating, it is easy to overheat, the deformation is also large, the plasticity and strength are relatively low, it is not suitable to manufacture tools that withstand large impact, but after heat treatment, it has higher hardness and wear resistance. Used to manufacture tools whose cutting edges do not heat up during work, such as woodworking tools, pneumatic tools, fitter tools, simple molds, rivet punches, center hole punches and punches, tools for cutting steel, bearings, tools, aluminum tin Die-casting plates and cores, and various types of springs.
T8Mn, T8MnA eutectoid steel. It has high hardenability and hardness, but low plasticity and strength. Used to manufacture woodworking tools, hand saw blades, marking tools, rivet dies, clockwork, band saw blades, circular saw blades, coal mine chisels, masonry chisels, etc.
T9, T9A hypereutectoid steel. Has a higher hardness, but lower plasticity and strength. It is used to manufacture various tools that require higher hardness and certain toughness, such as marking tools, rivet dies, press dies, punches, woodworking tools, agricultural machinery cutting parts, rock drilling tools, and mold shunt nails.
T10, T10A hypereutectoid steel. The grains are fine, and they do not overheat during quenching and heating (temperature up to 800℃), and can still maintain the fine grain structure; after quenching, there are undissolved excess carbides in the steel, so they have higher wear resistance than T8 and T8A steels. , But the toughness is low.
Used to make tools with cutting edges that do not heat up during work, tools with sharp edges and a little toughness that do not withstand impact loads, such as tools for processing wood, hand saws, hand wood tools, machine fines Wood tools, twist drills, drawing dies, punching dies, cold heading dies, screw cones, reamer tools, thread rolling plates, turning tools, planers, milling cutters, currency stamping dies, cold cut edges and punching dies with uniform small cross-sections , Low-precision and simple-shaped pallets, fitter scrapers, hard rock drills, tools for making rivets and nails, screwdrivers, files, chisels for carving, cutters for cutting paper and tobacco leaves, etc.
T11, T11A hypereutectoid steel. It has good comprehensive mechanical properties (such as hardness, wear resistance and toughness, etc.), the grains are finer, and it is less sensitive to the growth of grains and the formation of carbide networks when heated. Used to make tools whose cutting edges do not become hot during work, such as saws, chisel knives, taps, files, scrapers, springs, gauges, reamers, die cutting tools, tobacco cutting tools, small size and no sharp cross-section Varying cold dies and woodworking tools.
Tool steel T12, T12A hypereutectoid steel. Due to the high carbon content. After quenching, there are still many excess carbides, so the hardness and wear resistance are high, but the toughness is low, and the quenching deformation is large. Not suitable for manufacturing tools with high cutting speed and impact load. Used to manufacture tools that are not subject to impact load, the cutting speed is not high, and the cutting edge is not hot, such as turning tools, milling cutters, drill bits, reamers, reamers, taps, dies, scrapers, gauges, blades, small punches Heads, steel files, saws, clockwork, knives for cutting tobacco leaves, and cold-cutting dies and punching dies with small cross-sectional dimensions.
It is used to manufacture metal cutting tools that are not subject to impact loads but require extremely high hardness, such as razors, scrapers, wire drawing tools, files, carving tools, drills, and tools for hard rock processing and carving. Tool steel properties and uses T7, T7A subeutectoid steel. Has good plasticity, toughness and strength, and a certain hardness, can withstand shock and impact loads, but poor cutting ability. Used to manufacture tools that are not subject to impact load, and require appropriate hardness and wear resistance, and good toughness, such as forging dies, chisels, hammers, punches, metal shears, reamers, steel stamps, woodworking Tools, pneumatic tools, machine tool tops, fitter tools, drilling tools, blunt surgical instruments, etc.
T8, T8A eutectoid steel. When quenching and heating, it is easy to overheat, the deformation is also large, the plasticity and strength are relatively low, it is not suitable to manufacture tools that withstand large impact, but after heat treatment, it has higher hardness and wear resistance. Used to manufacture tools whose cutting edges do not heat up during work, such as woodworking tools, pneumatic tools, fitter tools, simple molds, rivet punches, center hole punches and punches, tools for cutting steel, bearings, tools, aluminum tin Die-casting plates and cores, and various types of springs.
T8Mn, T8MnA eutectoid steel. It has high hardenability and hardness, but low plasticity and strength. Used to manufacture woodworking tools, hand saw blades, marking tools, rivet dies, clockwork, band saw blades, circular saw blades, coal mine chisels, masonry chisels, etc.
T9, T9A hypereutectoid steel. Has a higher hardness, but lower plasticity and strength. It is used to manufacture various tools that require higher hardness and certain toughness, such as marking tools, rivet dies, press dies, punches, woodworking tools, agricultural machinery cutting parts, rock drilling tools, and mold shunt nails.
T10, T10A hypereutectoid steel. The grains are fine, and they do not overheat during quenching and heating (temperature up to 800℃), and can still maintain the fine grain structure; after quenching, there are undissolved excess carbides in the steel, so they have higher wear resistance than T8 and T8A steels. , But the toughness is low.
Used to make tools with cutting edges that do not heat up during work, tools with sharp edges and a little toughness that do not withstand impact loads, such as tools for processing wood, hand saws, hand wood tools, machine fines Wood tools, twist drills, drawing dies, punching dies, cold heading dies, screw cones, reamer tools, thread rolling plates, turning tools, planers, milling cutters, currency stamping dies, cold cut edges and punching dies with uniform small cross-sections , Low-precision and simple-shaped pallets, fitter scrapers, hard rock drills, tools for making rivets and nails, screwdrivers, files, chisels for carving, cutters for cutting paper and tobacco leaves, etc.
T11, T11A hypereutectoid steel. It has good comprehensive mechanical properties (such as hardness, wear resistance and toughness, etc.), the grains are finer, and it is less sensitive to the growth of grains and the formation of carbide networks when heated. Used to make tools whose cutting edges do not become hot during work, such as saws, chisel knives, taps, files, scrapers, springs, gauges, reamers, die cutting tools, tobacco cutting tools, small size and no sharp cross-section Varying cold dies and woodworking tools.
Tool steel T12, T12A hypereutectoid steel. Due to the high carbon content. After quenching, there are still many excess carbides, so the hardness and wear resistance are high, but the toughness is low, and the quenching deformation is large. Not suitable for manufacturing tools with high cutting speed and impact load. Used to manufacture tools that are not subject to impact load, the cutting speed is not high, and the cutting edge is not hot, such as turning tools, milling cutters, drill bits, reamers, reamers, taps, dies, scrapers, gauges, blades, small punches Heads, steel files, saws, clockwork, knives for cutting tobacco leaves, and cold-cutting dies and punching dies with small cross-sectional dimensions.
It is used to manufacture metal cutting tools that are not subject to impact loads but require extremely high hardness, such as razors, scrapers, wire drawing tools, files, carving tools, drills, and tools for hard rock processing and carving.
