Specifications

OD:25-356mm
WT:4-70mm
length:4-12m
standard:ASTM,JIS,GB,ect.
main markets:south america,Estern europe,southeast Asica,ect.

Seamless HF tube Grade St52.3 Spec Protocol for ARTIGIANTUBI

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)

Process: EAF + LF(VD) + HOT TUBING + SURFACE INSPECTION + PACKAGE

3) The tolerance data above mentioned should be determined based on the nominal dimension.   4) Straightness:

Max 4mm over 1000mm for OD<φ180mm, and max 5mm over 1000mm for OD>φ180mm.

5)

General Porosity≤2.5 level, Center Porosity≤2.5 level, Segregation≤2.5 level.

6) Mechanical properties (as hot rolled finished):

STEEL GRADE	Yield Strengt	Tensile Strength	Elongation	Charpy (V) Impact Test	Hardness
ST52.3	Rp0.2(Mpa)	Rm(MPa)	A(%)	J (-20°C)	BHN/HBW
	≥330	≤700	≥20	≥27	149—192

NOTE:For WT≤8mm tube impact test, only the calculation value of it should be accepted for reference, which will not be supposed as one of delivery prerequisite.

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