Let's talk about several commonly used ones, I hope it is useful to you:
1, 45-high-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, which has good comprehensive mechanical properties, low hardenability, and is prone to cracks during water quenching. Small pieces should be tempered, and large pieces should be normalized.
Application example: Mainly used to manufacture high-strength moving parts, such as turbine impeller and compressor piston. Shafts, gears, racks, worms, etc. Pay attention to the preheating of welded parts before welding, and stress relief annealing after welding.

2, Q235A (A3 steel)-the most commonly used carbon structural steel.
Main features: It has high plasticity, toughness and welding performance, cold stamping performance, and certain strength and good cold bending performance.
Application examples: Widely used for parts and welding structures with general requirements. Such as low-tension tie rods, connecting rods, pins, shafts, screws, nuts, ferrules, brackets, machine bases, building structures, bridges, etc.

3, 40Cr-one of the most widely used steel types, is an alloy structural steel.
Main features: After tempering, it has good comprehensive mechanical properties, low temperature impact toughness and low notch sensitivity, good hardenability, high fatigue strength when oil cooling, and complex shape when water cooling The parts are easy to crack, and the cold bending plasticity is medium. The cutting workability after tempering or tempering is good, but the weldability is not good, and the cracks are easy to be generated. It should be preheated to 100 ~ 150 before welding, generally used in the tempered state , Can also be carbonitrided and high frequency surface quenching treatment.
Application example: After quenching and tempering, it is used to manufacture medium-speed and medium-load parts, such as machine tool gears, shafts, worms, spline shafts, thimble sleeves, etc. After quenching and tempering and high-frequency surface quenching, it is used to manufacture high surface Hardness and wear-resistant parts, such as gears, shafts, main shafts, crankshafts, mandrels, sleeves, pins, connecting rods, screws and nuts, intake valves, etc., are used to manufacture heavy-duty, medium-duty, hardened and tempered High-speed impact parts, such as oil pump rotors, sliders, gears, main shafts, sleeves, etc., are used to manufacture heavy-duty, low-impact, wear-resistant parts such as worms, main shafts, shafts, and sleeves after quenching and low temperature tempering At the carbonitriding site, the transmission parts such as shafts and gears with larger size and higher impact toughness at low temperature are manufactured.

4. HT150Gray cast iron
Application examples: gear box, machine bed, box, hydraulic cylinder, pump body, valve body, flywheel, cylinder head, belt wheel , Bearing cover, etc.

5, 35Commonly used materials for various standard parts and fasteners
Main features: Appropriate strength, good plasticity, high cold plasticity, and acceptable weldability. Under cold conditions, it can be partially upset and drawn. Low hardenability, use after normalizing or quenching and tempering
Application examples: Suitable for the manufacture of small-section parts, parts that can bear large loads: such as crankshafts, levers, connecting rods, shackles, etc., various standard parts, Fasteners

6, 65MnCommonly used spring steel
Application examples: small size various flat, round springs, seat cushion springs, spring springs, can also be made into spring rings, valve springs , Clutch reed, brake spring, cold coil spiral spring, snap spring, etc.

7, 0Cr18Ni9The most commonly used stainless steel (US Steel No. 304, Japanese Steel No. SUS304)
Characteristics and Application: It is the most widely used as stainless heat-resistant steel, such as food equipment , General chemical equipment, originally used in industrial equipment

8, Cr12-commonly used cold work die steel (US steel number D3, Japanese steel number SKD1)
Characteristics and applications: Cr12 steel is a widely used cold work die steel , Is a high-carbon high-chromium type of cladding steel. The steel has good hardenability and good wear resistance; because the carbon content of Cr12 steel is up to 2.3%, the impact toughness is poor, brittle cracking, and uneven eutectic carbides are easily formed;
Because Cr12 steel has good wear resistance, it is mostly used to manufacture punches, dies, drills, drills and drills for cold wear dies, punches, blanking dies, cold heading dies, cold extrusion dies, which require low wear resistance under low impact load. Sets, gauges, wire drawing dies, stamping dies, thread rolling plates, drawing dies and cold stamping dies for powder metallurgy, etc.

9, DC53Commonly used cold work die steel imported from Japan
Characteristics and application: High strength and toughness cold work die steel, Japan Datong Special Steel Co., Ltd. steel number. After high temperature tempering, it has high hardness, high toughness, and good linear cutting. 9 Used for precision cold stamping die, drawing die, thread rolling die, cold punching die, punch, etc.

10, SM45Ordinary carbon plastic mold steel (Japanese steel number S45C)

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