Are they usually steel 45? Under what circumstances do you need special treatment? Such as conditioning? Seek great God pointing! Be deeply grateful！
Cost considerations should be taken into account in mechanical design. If the material used in the design is too good, resulting in the overall cost is too high, it will make the loss of enterprises. The 45 steel is a slightly higher quality carbon structural steel, only in some major components or shaft parts only use 45 steel, and more use of lower strength Q235 and other carbon structural steel.
If you pay attention, you will find that the country with the largest amount of steel, steel, steel and other materials is a low cost Q235 material, followed by Q345 and other materials, only in the shaft parts of important requirements, has high hardness and comprehensive strength, it needs conditioning, with 45 steel quenched and tempered steel or 40Cr like the.
Material selection principle is to meet the strength requirements of the premise, the use of the lowest price material.
