JIS G3460 Steel Pipes for low temperature service

Categories	Boiler Tubes
Brand	fushun
Model	JIS G3460
Type	Hot Rolled / Cold Drawn
Delivery Condition	As Rolled, Cold Drawn, Normalizing Rolled
Update Time	Apr 23,2024

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JIS G3460 Steel pipes for low temperature service

JIS G3460 Steel pipes used for piping at extremely low temperatures of freezing point or under

JIS G3460 Steel pipes Manufacturing method

The manufacturing method shall be as follows.

The pipes shall be manufactured from fine-grained killed steels. Pipes of STPL380 shall be seamless or electric resistance welded, and those of STPL450 and STPL690 shall be seamless.

JIS G3460 Steel pipes dimensional and tolerances

Outside diameter: 10.5-660.4mm

wall thickness: sch 10-160

dimensional and tolerances: +/-1% OD ; +/- 1.6mm WT

JIS G3460 Steel pipes Chemical composition

Symbol of grade	C	Si	Mn	P	S	Ni
STPL380	0.25 max.	0.35 max.	1.35 max.	0.035 max.	0.035 max.	/
STPL450	0.18 max.	0.10 to 0.35	0.30 to 0.60	0.030 max.	0.030 max.	3.20 to 3.80
STPL690	0.13 max.	0.10 to 0.35	0.90 max.	0.030 max.	0.030 max.	8.50 to 9.50

JIS G3460 Steel pipes Mechanical properties

Symbol of grade	Tensile strength N/mm²	Yield point or proof stress N/mm²	Elongation %
			Tensile test piece and tensile test direction
			Test piece No. 11 or No. 12	Test piece No. 5	Test piece No. 4
			Parallel to pipe axis	Perpendicular to pipe axis	Parallel to pipe axis	Perpendicular to pipe axis
STPL380	380 min.	205 min.	35 min.	25 min.	30 min.	22 min.
STPL450	450 min.	245 min.	30 min.	20 min.	24 min.	16 min.
STPL690	690 min.	520 min.	21 min.	15 min.	16 min.	10 min.

JIS G3460 Steel pipes Heat treatment

STPL380/STPL450 Normalizing, normalizing followed by tem pering, or quenching followed by tempering

STPL690 Normalizing twice followed by tempering, or quenching followed by tempering

JIS G3460 Steel pipes Appearance

Appearance shall be as follows.

a) The pipes shall be straight, and the both ends shall be perpendicular to the pipe axis for practical purposes.

b) Both the internal and external surfaces of pipes shall be smoothly finished and free from defects detrimental to use.

c) Pipes may be repaired by grinding or machining, provided that the wall thickness of the product after repairing satisfies the specified tolerances. Repair by weldingis not permitted.

d) The surface of the repaired part shall be smooth along the contour of the pipe.

e) The external surface of the part where a weld bead was removed shall be smooth along the contour of the pipe.