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    A brief description of the characteristics and uses of 24 co
    1, 45 - quality carbon structural steel is the most commonly used medium carbon quenched and tempered steel.

    Main features: the most commonly used medium carbon quenched and tempered steel has good comprehensive mechanical properties, low hardenability, and easy to crack when water quenched. Small parts should be treated with quenching and tempering, and large parts should be treated with normalizing.

    Examples are mainly used for manufacturing high strength moving parts, such as turbine impeller and compressor piston. Shaft, gear, rack, worm and so on. The welds should be preheated before welding, and stress relieving after welding.

    2, Q235A (A3 steel) - the most commonly used carbon structural steel

    Main features: high plasticity, toughness and welding properties, cold stamping properties, and certain strength, good cold bending properties.

    Application examples: widely used in general requirements of parts and welding structure. Such as less tensile rod, connecting rod, pin, shaft, screw, nut, ring, bracket, frame, building structure, bridge and so on.

    3. 40Cr, one of the most widely used steels, belongs to alloy structural steel.

    Main features: after quenched and tempered, it has good comprehensive mechanical properties, low temperature impact toughness and low notch sensitivity, good hardenability and high fatigue strength when oil is cold. When water is cold, the parts of complex shape are easy to produce cracks, cold bending plasticity is medium, and the machinability is good after tempering or tempering, but weldability Bad, easy to produce cracks, before welding should be preheated to 100~150 degrees, generally in the state of quenching and tempering, carbon and nitrogen co permeation and high frequency surface quenching treatment.

    Application examples: after quenching and tempering, it is used to make parts of medium speed and medium load, such as machine gear, shaft, worm, spline shaft, and thimble sleeve, etc., and are quenched and quenched for high hardness and wear-resistant parts, such as gear, shaft, spindle, crankshaft, shaft, sleeve, pin, screw nut and screw nut. The parts of heavy load and medium speed impact, such as oil pump rotor, slider, gear, spindle, ring, etc. after quenching and tempering, are used to make heavy load, low impact and wear-resistant parts such as worm, spindle, shaft and ring after quenching and low temperature tempering. Transmission parts with low temperature impact toughness, such as shafts, gears, etc.

    4, HT150 - gray cast iron

    Examples are: gear box, machine tool bed, box, hydraulic cylinder, pump body, valve body, flywheel, cylinder head, pulley, bearing cap and so on.

    5, 35 - commonly used materials for various standard parts and fasteners.

    Main features: suitable strength, good plasticity, high cold plasticity and weldability. The local upsetting and drawing can be made in the cold state. Low hardenability, used after normalizing or tempering.

    Application examples: parts suitable for the manufacture of small section parts, which can bear large loads, such as crankshaft, lever, connecting rod, hook and ring, all kinds of standard parts and fasteners.

    6, 65Mn - common spring steel

    Application examples: small size, round spring, cushion spring, spring spring, and can also make spring ring, valve spring, clutch spring, brake spring, cold coil spring, spring coil, etc.

    7, 0Cr18Ni9 -- the most commonly used stainless steel (American steel number 304, Japan steel SUS304)

    Characteristics and applications: as the most widely used stainless steel, such as food equipment, general chemical equipment, originally used for industrial equipment.

    8, Cr12 - commonly used cold work die steel (American steel D3, Japan steel SKD1)

    Characteristics and application: Cr12 steel is a widely used cold working die steel, which belongs to the high carbon and high chromium type Laixing steel. The steel has better hardenability and good wear resistance, because the carbon content of Cr12 steel is as high as 2. 3%, the impact toughness is poor, brittle fracture, and easy to form an uneven eutectic carbide; Cr12 steel, because of its good wear resistance, is used to manufacture cold punch die, punch, die, cold heading die, die, die, drill sleeve, gauge, drawing die, which require low impact load. Impression die, rubbing wire plate, drawing die and cold pressing die for powder metallurgy.

    9, DC53 - commonly used cold work die steel imported from Japan

    Characteristics and applications: high strength and toughness cold working die steel, Japan Datong special steel (strain) manufacturer steel number. After high temperature tempering, it has high hardness, high toughness and good wire cutting performance. It is used for precision cold stamping die, drawing die, wire rolling die, cold punching die, punch and so on.

    10, Cr12MoV - wear-resistant chromium steel

    Homemade. The carbon content of Cr12 steel is lower than that of Mo and V, and the non uniformity of carbides is improved. MO can reduce the segregation of carbide and increase the hardenability, and V can refine the grain increase toughness. The steel has high hardenability. The section can be completely quenched below 400mm and can still maintain good hardness and wear resistance at 300~400 C. It has higher toughness than Cr12, small change in volume, high wear resistance and good comprehensive mechanical properties. So we can make various moulds with large cross section and complex shape, such as ordinary drawing die, punch die, punch die, blanking die, edge die, roller die, drawing die, cold extrusion die, cold cut scissors, circular saw, standard tools, measuring tools and so on.

    11, SKD11 - ductile chromium steel

    Japanese Hitachi plant type production. The casting structure in the steel is improved technically and the grain is refined. The toughness and wear resistance of Cr12mov are improved. The service life of the die has been prolonged.

    12, D2 -- high carbon and high chromium cold steel

    It is made in the United States. It has high hardenability, hardenability, wear resistance, good oxidation resistance at high temperature, good resistance to corrosion and low heat treatment after quenching and polishing. It is appropriate to make various cold working dies with high precision and long life, tools and measuring tools such as tensile die, cold extrusion die, cold shear knife and so on.

    13, SKD11 (SLD) -- high chromium steel with non deformation toughness

    Japanese Hitachi plant type production. As the content of MO and V in steel is increased, the casting structure in steel is improved, grain refinement is refined and the morphology of carbide is improved. Therefore, the strength and toughness of the steel (flexural strength, deflection, impact toughness, etc.) are higher than that of SKD1, D2, and wear resistance, and have higher resistance to fire resistance. Practice has proved that the life of this steel die is higher than that of Cr12mov. We often manufacture moulds that require high requirements, such as drawing die, mold for impacting grinding wheel, etc.

    14, DC53 -- high toughness and high chromium steel

    Japanese Datong plant type production. The hardness of heat treatment is higher than that of SKD11. High temperature (520-530) can reach 62-63HRC high hardness after tempering, and DC53 exceeds SKD11 in strength and wear resistance. The toughness is two times that of SKD11. Toughness of DC53 rarely occurs cracks and cracks in cold working dies. The service life is greatly improved. The residual stress is small. The residual stress is reduced by turning back at high temperature. Because the cracks and deformation after wire cutting are suppressed. The machinability and abrasiveness are more than SKD11. For precision stamping die, cold forging, deep drawing die and so on.

    15, SKH-9 -- general high speed steel with high wear resistance and toughness

    Japanese Hitachi plant type production. It is used for cold forging die, cutting machine, drill bit, reamer, punch and so on.

    16, ASP-23 - PM high speed steel

    It is made in Sweden. Carbide distribution is extremely uniform, wear resistant, high toughness, easy to process, heat treatment size is stable. It is used for various kinds of long life cutting tools, such as punch, deep drawing die, drill die, milling cutter and cutting blade.

    17, P20 - the size of plastic moulds that are generally required

    It is made in the United States. Electrical erosion operation. Out of the factory prehardened HB270-300. The hardness of quenching is HRC52.

    18, 718 -- high required size plastic moulds

    It is made in Sweden. Especially the electric corrosion operation. Out of the factory prehardened HB290-330. Quenching hardness HRC52

    19, NAK80 - high mirror, high precision plastic mold

    Japanese Datong plant type. Out of the factory prehardened HB370-400. Quenching hardness HRC52

    20, S136 -- plastic mold for corrosion prevention and mirror polishing.

    It is made in Sweden. Out of the factory prehardened HB<215. The hardness of quenching is HRC52.

    21, H13 -- common die casting die

    Used for die-casting of aluminum, zinc, magnesium and alloy. Hot stamping die, aluminum extrusion die.
    22, SKD61 - advanced die casting die
    The Japanese Hitachi plant has been significantly improved in its service life compared with H13 through the electric ballast redissolution technology. Hot stamping die, aluminum extrusion die.

    23, 8407 -- advanced die casting die

    It is made in Sweden. Hot stamping die, aluminum extrusion die.

    24, FDAC - adding sulfur to strengthen its chippability

    The hardness of pre hardened factory is 338-42HRC, which can be directly carved and processed without quenching and tempering. For small batch mold, simple mold, all kinds of resin products, sliding parts, short delivery mold parts, zipper mold, spectacle frame mold.

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