offer Seamless HF tube Grade ST52 with high quanlity and low price

Specifications

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

1) Chemistry(%):

C	Si	Mn	P	S	Cr	Ni	Cu	V
≤0.22	≤0.55	≤1.60	≤0.035	≤0.035	≤0.40	≤0.20	≤0.30	0.05-0.09

 

2)

Smelting Process: EAF + REFINE

 

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

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

 

4) Straightness:

Max 3mm over 1000mm for OD<φ180mm, and max 4mm over 1000mm for OD>φ180mm.

 

5) Macro-structure:             

General Porosity≤2.5 level,    Segregation≤2.5 level.

 

6) Mechanical properties (as hot rolled finished):

STEEL GRADE	Yield Strength	Tensile Strength	Elongation	Charpy (V) Impact Test)	Hardness
ST52	Rp0.2(Mpa)	Rm(MPa)	A(%)	J (-20°C)	BHN/HBW
	≥330	≤700	≥21	≥27	149—192

NOTE:For WT≤8mm,the tube impact test value will not be supplied.

 

7) Surface of the material should be free of defects such as cracks, overlapping, bubble, scabs, skin slag etc.. Other defects with the depth limited into the WT minus tolerance can be accepted.

 

8) Delivery condition: hot finished.

 

9)

MTR, Packing and Marking will be followed HUBEI XINYEGANG STEEL’ s exporting Specs.

 

10)

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