GB 20Cr 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 20Cr steel Annealing delivery hardenss less than 250HB.20Cr With a lower carbon content range, So GB 20Cr alloy steel have good weldability.
|
20Cr Chemical Composition
|
|
Grade
|
The Element Max (%)
|
|
C
|
Si
|
Mn
|
Cr
|
Mo
|
|
20Cr
|
0.18-0.24
|
0.17-0.37
|
0.50-0.80
|
0.70-1.00
|
|
|
Ni
|
V
|
W
|
B
|
Ti
|
|
Grade
|
|
20Cr Mechanical Property
|
|
Thickness
|
Yield
|
Tensile
|
|
20Cr
|
mm
|
Min Mpa
|
Mpa
|
|
6-50
|
540
|
835
|
|
50-200
|
540
|
835
|
Heat treatment Related
Annealing of 20Cr 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 20Cr alloy steel will get MAX 250 HB （Brinell hardness.
Hardening of GB Alloy structural steel 20Cr
First quenching heated slowly to 880°C, Then after adequate soaking at this temperature quench in oil or water. Temper as soon as tools reach room temperature.Second quenching heat to 780-820°C， then quenching in oil or water.Tempering of 20Cr Alloy structural steel,Heat to 20°C, then cool in water or oil.normal delivery hardness 179HB Min.
Contact our experienced sales team to help you with your 20Cr alloy steel questionsadn enquiry by Email or Telphone. The questions will be reply in 24 hours.
