Parts commonly used in large-scale machining:
1. Q235A (A3 steel)
Q235A is the most commonly used carbon structural steel at present.
Main features: high plasticity, high toughness, high welding performance, high cold stamping performance, and certain strength cold bending performance.
It is mainly used in mechanical parts and welded structural parts with low requirements, such as pull rods, connecting rods, pins, shafts, screws, nuts, brackets, bases, etc.
2.40Cr
40Cr is one of the most widely used alloy structural steels at present.
Main features: after quenching and tempering, it has good comprehensive mechanical properties, low temperature impact toughness, low notch sensitivity and good hardenability. Higher strength can be obtained when oil is cooled, and parts are easy to crack when water is cooled. After tempering or tempering, the machinability is good, but the weldability is not good, and cracks are easy to occur.
Mainly used for: after quenching and tempering, it is used to manufacture mechanical parts with medium speed movement, such as machine tool gears, shafts, worms, etc. After tempering and high-frequency surface quenching, it is used to manufacture parts with high surface hardness and wear resistance, such as gears, shafts, spindles, crankshafts, spindles, sleeves, pins, connecting rods, etc. Used for manufacturing heavy metals after quenching and medium temperature tempering.
Mechanical parts with load and medium speed movement, such as oil pump rotor, sliding block, gear, spindle, etc. After quenching and low temperature tempering, it is used to manufacture heavy-duty, low impact and wear-resistant mechanical parts, such as worm, spindle, shaft, etc. At the carbonitriding place, the transmission parts with large size and high low-temperature impact toughness, such as shafts and gears, are manufactured.
3.45#
45 # is a high-quality carbon structural steel, which is the most commonly used medium carbon quenched and tempered steel at present.
Main features: it has good comprehensive mechanical properties, low hardenability, and is prone to cracks during water quenching. The weldment needs to be preheated before welding and annealed after welding.
It is mainly used for manufacturing high-strength mechanical moving parts, such as impeller, piston, shaft, gear, rack, worm, etc.
4.35#
35 # is a common material for various standard parts and fasteners
Main features: moderate strength, good plasticity, high cold plasticity and good weldability. Low hardenability, used after normalizing or quenching and tempering.
It is mainly used for manufacturing mechanical parts that can bear large loads, such as crankshaft, lever, connecting rod, shackle, etc.
5.HT150
HT150 is grey cast iron.
Mainly used for: machine bed, box, hydraulic cylinder, pump body, valve body, cylinder head, flywheel, pulley, bearing cover, etc.
6.0Cr18Ni9
0Cr18Ni9 is the most commonly used stainless steel material, American steel 304, Japanese steel SUS304.
It is mainly used for: food equipment, chemical equipment, and raw energy industrial equipment.
7.Cr12
Cr12 is a commonly used cold working die steel, American steel D3 and Japanese steel skd1.
Main features: good hardenability and wear resistance, poor impact toughness, easy to embrittle, and easy to form uneven eutectic carbides.
It is mainly used for manufacturing cold stamping dies, punches, blanking dies, cold upsetting dies, punches and dies of cold extrusion dies, drill sleeves, gauges, wire drawing dies, stamping dies, wire rolling plates, deep drawing dies, and cold stamping dies for powder metallurgy, which require high wear resistance and are subject to small impact loads.
8.D2
D2 is a high carbon and high chromium cold worked steel.
Main features: high hardenability, high hardenability, high wear resistance, good high temperature oxidation resistance, good corrosion resistance after quenching and polishing, and small deformation after heat treatment.
Mainly used for: manufacturing high-precision, long-life cold working molds, cutting tools and measuring tools. Such as drawing die, cold extrusion die, etc.
The materials commonly used in large-scale machining include the above 8 kinds. Only by understanding the characteristics and related uses of these materials can we better select the materials needed in large-scale machining and process parts that are more suitable for mechanical equipment.