Hot rolled DIN1.7225 / SAE4140 / GB42CrMo, JIS SCM440, Forged Alloy Steel Rings
Description:
1.DIN1.7225/SAE4140/GB42CrMo,JIS SCM440 alloy steel plate
2.Hot rolled or forged condition, annealing or harden, black or milled surface
3.Pre-heat treatment:
- Annealing : heat to 840-860°c, keep 2H, furnace cold, hardness≤217HBS
- High temperature tempering : heat to 680-700°c, air cold, hardness ≤217HBS
4.Heat treatment:
- Normalization: heating to 840 to 880 ° C, maintenance, furnace cooling to 600 ° C, then in air.
- Stress relieving: after rough heat to 500 ° C, maintenance raff. In oven to 400 ° C, then in air.
- Hardening: preheating from 600 to 650 ° C austenitizing at 840 to 880 ° C, quenching in oil.
- Tempering: heating to 550 - 650 ° C and maintenance regime, again depending on the
- mechanica properties
5.Hot rolled technology:EAF+LF+VD
Forged technology: EAF+LF+VD+ESR+Forging +Q T + Machined surface
6.Ultrasonic test standard: SPE1921-GR3, CLASS C/C or D/D
7.Production leadtime: 7~10 days
8. Chemical composition:
|
C |
Mn |
Si |
Cr |
Ni |
Cu |
P |
S |
|
0.17-0.23 |
0.30-0.60 |
0.15-0.40 |
1.25-1.75 |
3.25-3.75 |
≤0.25 |
≤0.030 |
≤0.030 |
9.Compared grades(based on usage):
|
Chinese |
American |
German |
Japanese |
|
GB |
AISI |
DIN |
JIS |
|
42CrMO4 |
4140 |
1.7225 |
SCM440 |
Applications:
- General service industries (petroleum, food, chemical, paper, fertilizer, Fabric, aviation and
- nuclear)
- Fluid, gas and oil transport
