Hot Rolled Forged Alloy Steel Round Bar Aisi 4140 / Din1.7225

 

Hot Rolled Forged Alloy Steel Round Bar AISI 4140 / DIN1.7225

 

 4140 Alloy  Steel Round Bar / 1.7225 Alloy  Steel Rod  

 

Description:

 

1.DIN1.7225 / SAE4140 / GB42CrMo / JIS SCM440 Alloy Steel  Round Bar /  Steel Rod 

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 mechanical 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
42CrMo	4140	1.7225	SCM440

 

Specifications:

 

Hot rolled condition	Steel round bar (mm)		Mill name
	Diameter	Length
	¢16~¢255	2000~5800	Dongbei,XiNing, BengGang, ShouGang steel
Forged condition	¢150~¢600	2500~4000	Local mill with 6000tons fluid forged machine

 

 

4140 Alloy Steel Applications:

 

General service industries (petroleum, food, chemical, paper, fertilizer,  Fabric, aviation and nuclear)

Fluid, gas and oil transport

Pressure and heat transmission

Construction and ornament

Boiler heat exchangers

 

 

Competitive Advantage:

 

  Good purity and homogeneity.

  Good machinability(Roughing, grinding and drilling).

  Good dimensional stability during heat treatment.

  Excellent preparation for nitriding, both ionic and gaseous, induction hardening to increase the mechanical properties.

  Competitive price

  Fast production leadtime

  All the material are inspected with 3 times to meet the highly standards