GB 40CR alloy Steel is a high quality Quenched and Tempered Alloy Structural steel, It belong to the high quality low carbon,Low alloy chromium, molybdenum, nickel case hardening steel. Oil Quenched & Tempered Hardness is 28-34 HRc. GB 40CR steel Annealing delivery hardenss less than 250HB. 40CR With a lower carbon content range, So GB 40CR alloy steel have good weldability.
Equivalent Of 40Cr alloy Structure Steel
|5140 / G51400||41Cr4 / 1.7035||40Cr||SCr440||42C4||530A40 / 530M40||41Cr4||2245|
Heat treatment Related
- Annealing of 40CR Alloy structural steel
Slowly heated to 850 ℃ and allow enough times, let the steel to be thoroughly heated, Then cool slowly in the furnace. The 40CR alloy steel will get MAX 250 HB （Brinell hardness）.
- Hardening of 40CR Alloy structural steel
Heated slowly to 880-920°C, Then after adequate soaking at this temperature quench in oil. Temper as soon as tools reach room temperature.