What's the 45# steel tensile strength?

Tensile strength of 45# steel

The GB / T699-1999 standard stipulates that the tensile strength of 45# steel is 600 MPa min., the yield strength is 355 MPa min., the elongation is 16% min., the section shrinkage is 40%, and the impact energy is 39J.

After quenching 45# steel, is the tensile strength higher than before?

1. there are two concepts to clarify, one is called tensile strength, which is a concept in mechanics. Another is called the allowable tensile strength, which is a concept in engineering. It divides the tensile strength in the mechanical test by the safety factor. Generally, 1.5 to 3 is selected. The value obtained is the strength that can be used in engineering calculations.
2. After quenching 45# steel, its plasticity is reduced, its toughness is reduced, its hardness is increased, and its resistance to deformation is strong. The tensile strength of elastic deformation is improved, but the breaking strength is not changed much.
3. So this question is actually not very accurate, but generally you can guess based on the actual situation, you want to ask to start with unrecoverable tensile strength. Therefore, you just have to check in to see which one is needed. If you do an experiment, the result can definitely be more than 1,000, and the experimental result is mechanical strength. It is not the allowable tensile strength used in engineering.