EN 31 Alloy Steel

Grade

C

Mn

P

S

Si

Ni

Cr

Mo

EN31

0.95-1.10

0.40-.0.70

0.035 max

0.030max

0.10-0.35

-

1.20-0.35

-

Thermal Conductivity at C

W / (m*K)

20

44.5

350

45

700

46

Soft Annealing C

700-800

Cooling

Furnace

Hardness HB

max. 207

Stress-relief Annealing C

600-650

1st Pre-Heating C

up to approx. 400 in an air-circulating furnace

2nd and 3rd

800 and 900

Hardening C

800-820

Quenching

520C Oil Quench

Tempering C

at least twice 150-200

Hardness after Temperature HRC

61-63