What are the characteristics of commonly used mechanical mold steel and what are its uses? Now let me introduce it to you.
luminum alloy castings
1. 45- high-quality carbon structural steel, which 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 is prone to cracking during water quenching. Small parts should be treated with quenching and tempering, while large parts should be treated with normalizing. Application example: Mainly used for manufacturing high-strength moving parts, such as turbine impellers and compressor pistons. Shafts, gears, racks, worms, etc. Pay attention to preheating before welding and stress relief annealing after welding.
2. Q235A (A3 steel) - the most commonly used carbon structural steel
Main features: high plasticity, toughness, welding performance, cold stamping performance, as well as certain strength and good cold bending performance. Application example: Widely used for general requirements of parts and welded structures. Such as tension rods, connecting rods, pins, shafts, screws, nuts, collars, brackets, machine bases, building structures, bridges, etc. that are not subjected to significant force.
3. 40Cr - one of the most widely used steel grades, belonging to alloy structural steel
Main features: After quenching and tempering treatment, it has good comprehensive mechanical properties, low temperature impact toughness, and low notch sensitivity. It has good hardenability and can achieve high fatigue strength when oil cooled. Complex shaped parts are prone to cracking when water cooled, with moderate cold bending plasticity. After tempering or quenching, it has good machinability, but poor weldability and is prone to cracking. It should be preheated to 100-150 ℃ before welding. It is generally used in a quenched and tempered state, and can also be subjected to carbon nitrogen co infiltration and high-frequency surface quenching treatment. Application example: After quenching and tempering, it is used to manufacture parts with medium speed and medium load, such as machine tool gears, shafts, worm gears, spline shafts, top pin sleeves, etc. After quenching and high-frequency surface quenching, it is used to manufacture parts with high surface hardness and wear resistance, such as gears, shafts, spindles, crankshafts, mandrels, sleeves, pins, connecting rods, screws and nuts, intake valves, etc. After quenching and tempering at medium temperature, it is used to manufacture parts with heavy load and medium speed impact, such as oil pump rotors, sliders, gears, spindles, sleeve rings, etc. After quenching and low-temperature tempering, it is used to manufacture parts with heavy load, low impact, and wear resistance, such as worms, spindles, shafts, sleeve rings, etc. The dimensions of carbon and nitrogen infiltration are then manufactured. Transmission parts with larger and higher low-temperature impact toughness, such as shafts, gears, etc.
4. HT150- Grey cast iron
Application examples: gear box, machine bed, box, hydraulic cylinder, pump body, valve body, flywheel, cylinder head, pulley, bearing cover, etc.
5. 35- Common 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 locally upset and drawn. Low hardenability, used after normalizing or quenching. Examples of applications: Suitable for manufacturing small section parts that can withstand large loads, such as crankshafts, levers, connecting rods, hooks, etc., various standard parts, fasteners.
6. 65Mn - commonly used spring steel
Application examples: Various small-sized flat and round springs, seat cushion springs, spring springs, can also be made into spring rings, valve springs, clutch springs, brake springs, cold coil coil springs, snap springs, etc.
7. 0Cr18Ni9- The most commonly used stainless steel (American grade 304, Japanese grade SUS304)
Characteristics and applications: As a stainless and heat-resistant steel, it is widely used in food equipment, general chemical equipment, and industrial equipment.
8. Cr12- Commonly used cold work mold steel (American grade D3, Japanese grade SKD1)
Characteristics and applications: Cr12 steel is a widely used cold work mold steel, belonging to the high carbon and high chromium type of martensitic steel. This steel has good hardenability and good wear resistance; Due to the high carbon content of 2.3% in Cr12 steel, its impact toughness is poor, it is prone to brittle cracking, and uneven eutectic carbides are easily formed; Due to its excellent wear resistance, Cr12 steel is often used to manufacture cold stamping dies, punches, cutting dies, cold heading dies, cold extrusion dies with low impact loads and high wear requirements, as well as punch and concave dies, drill sleeves, gauges, drawing dies, stamping dies, wire drawing plates, deep drawing dies, and cold pressing dies for powder metallurgy.
9. DC53- Commonly Used Cold Work Mold Steel Imported from Japan
Features and applications: High strength and toughness cold work mold steel, steel grade from Japanese Datong Special Steel (Company) manufacturer. After high-temperature tempering, it has high hardness, high toughness, and good wire cutting performance. Used for precision cold stamping dies, drawing dies, wire rolling dies, cold punching dies, punches, etc. 10. SM45- ordinary carbon plastic mold steel (Japanese steel grade S45C)
10. DCCr12MoV - wear-resistant chromium steel
Domestically produced. Compared to Cr12 steel, this steel has a lower carbon content and the addition of Mo and V improves the unevenness of carbides. MO can reduce carbide segregation and improve hardenability, while V can refine grains and increase toughness. This steel has high hardenability, and can be completely quenched below 400mm in cross-section. It can still maintain good hardness and wear resistance at 300-400 ℃, and has higher toughness than Cr12. The volume change during quenching is small, and it also has high wear resistance and good comprehensive mechanical properties. Therefore, it can manufacture various molds with large cross-section, complex shape, and withstand large impacts, such as ordinary drawing molds, punching concave molds, punching molds, material dropping molds, trimming molds, and rolling molds. Dies, drawing dies, cold extrusion dies, cold cutting scissors, circular saws, standard tools, measuring tools, etc.