Specifications

OD:25-356mm
WT:4-70mm
standard:ASTM,GB,JIS,ect...
main markets:South America,Eastern Europe,Southeast Asia,Africa

TECHNICAL PROTOCOL FOR SEAMLESS STEEL TUBES SAE (AISI/ASTM)4340

1)Chemistry(%):

GRADE		C	Si	Mn	P	S	Cr	Mo	Ni	H	Cu
SAE4340	min	0.38	0.15	0.60			0.70	0.20	1.65
	max	0.43	0.30	0.80	0.035	0.035	0.90	0.30	2.00	3ppm	0.25

NOTE:The chemical composition permissible tolerance should be conformed with the following table:

C	Si	Mn	P	S	Cr	Ni
±0.01	±0.03	±0.03	+0.005	+0.005	±0.03	±0.05

 

2) Smelting Process: EAF +LF+VD/RH

 

3) Tolerance: OD: +1%,WT: +10%.

The tolerance data above mentioned should be determined based on the nominal dimension. 

  4) microcleanliness- inclusion ratings meet within the maximum level per ASTM E45 method A.

/ype	A	B	C	D
Thin	2.5	2.0	2.0	2.0
/Heavy	1.5	1.5	1.5	1.5

5)grain size 5—8 per ASTM E112

6) Surface of the material should be free of defects such as cracks, overlapping, bubble, scabs, skin slag etc..

7) Delivery condition:annealed.

8)

Any matters occurred during production and transactions will be amiably settled down by both parties.

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