1. 45- High quality carbon structural steel, which is the most commonly used medium carbon quenched and tempered steel.
Main features: Medium carbon quenched and tempered steel, which is most commonly used for precision Machine element processing, has good comprehensive mechanical properties, low hardenability, and is easy to crack during water quenching. Small parts should be quenched and tempered, while large parts should be normalized.
Application example: mainly used for manufacturing high-strength moving parts, such as turbine impellers and compressor pistons. Shafts, gears, racks, worms, etc. The welding area should be preheated before welding and stress relieved and annealed after welding.
2. Q235A (A3 steel) - The most commonly used carbon structural steel.
Main characteristics: high plasticity, toughness, and welding performance, good cold stamping performance, and certain strength, 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, rings, brackets, frames, building structures, bridges, etc.
3. 40Cr - one of the most widely used steel grades, is an alloy structural steel.
Main characteristics: after tempering treatment, it has good comprehensive mechanical properties, low impact toughness and notch sensitivity at low temperature, good hardenability, high fatigue strength can be obtained by oil cooling, parts with complex water-cooled shapes are easy to crack, medium plasticity, and good quenching and tempering workability after cold bending tempering or cutting, but poor weldability, easy to crack, and should be preheated to 100~150 ℃ before welding, generally used in the quenching and tempering state, It can also be used for carbonitriding and high-frequency surface quenching treatment.
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, local upsetting and wire drawing can be carried out. Low hardenability, used after normalizing or tempering
Application example: Suitable for manufacturing small cross-section parts that can withstand large loads, such as crankshafts, levers, connecting rods, shackles, and various standard parts and fasteners
6. 65Mn - commonly used spring steel
Application examples: various small-sized flat and round springs, seat cushion springs, spring springs, as well as spring rings, valve springs, clutch springs, brake springs, cold coil coil springs, snap springs, etc. can also be made.
