4340 steel Round Bar EN24,817M40 ,SNCM439 

 

1. Standards:  AISI 4340 8620 8640 4320 , JIS SNCM8  GB:40CrNiMoA 

 

2. Specification: Dia: 80~450mm  Length:2000-13000mm or as required

  

3. Process:  EAF+LF+VD ( necessary)    UT+ Peeled +Turned + Heat Treatment (optional)

 

4. Machine Capability

 

Tensile strength (N/mm2Mpa): >=980(100)
Elongation: >=12
Yield strength: >=835(85)
Hardness:( HBS 100/3000)<=269
Reduction of area:>=55

Akv(J)>=78  akv(J/cm2):>=98(10)

 

5. Chemical Composition (%):www.forgedroundbar.com

 

C	Si	Mn	S	P	Cr	Ni	Cu	Mo
0.37-0.44	0.17-0.37	0.40-0.80	0.025(max)	0.025(max)	0.60-0.90	1.25-1.65	0.025(max)	0.15-0.25

  

6. Inspection: 100% Ultrasonic according to the test standards:SEP1921-84,GR.3 CLASS C/C 

 

7. Packing situation: standard seaworthy packing or as customer required

 

8. Delivery time: 20 days after order confirmed

 

9. Payment: T/T or L/C at sight.

 

10.Application:High strength,high toughness, large sectionand and important modified parts 

 

Note:

1. According to national standard (GB)for our products, if not, supply according to national standards(GB) or agreement.

 

 

2. We can not only provide electric furnace +LF+VD and electroslag re-melting(ESR)steel forging materials, but also forging products of piece, bar, etc.

 

 

3. Our company is equipped with roll equipment and can provide our customers with roll billets or finished.

 

 

4. Please send us your detailed specifications when inquire.We will reply to you ASAP.