JIS G3460 STPL380 Seamless Steel Tubes

JIS G3460 STPL380 Seamless Steel Tubes
 
Standard:JIS G3460
Steel tubes for low temperature service
 
JIS G3460 STPL380 Steel tubes for piping used at particularly low temperature below freezing.
JIS G3460 STPL380 Steel tubes usually applies to pipes with an outer diameter of 10.5 mm to 660.4 mm.
 
JIS G3460 STPL380 Steel Tubes Quick Details
Manufacturing:Seamless; Electric resistance welding
Type:Hot finished,Cold finished,welded.
Wall thickness(WT): 12.7mm——50 mm.
Outer diameter (OD): 10.5mm——660.4mm
Length: 6M or specified length as required.
Ends: Plain End, Beveled End, Treaded
 
Additional Info
Port of Shipment: Tianjin, China
Payment Terms:T / T, LC
Delivery: 7-15 days after payment
Surface: Tubes will be varnished (Outside only) to prevent rust.
Marking: Standard + Steel Grade + Size + Heat No + Lot No
Package:Standard export package,suit for all kinds of transport, or as required
 

Manufacturing method
The tube is made of fine-grained killed steel, STPL 380 is manufactured seamlessly or by electrical resistance welding.
The end of the pipe is plain end unless otherwise specified.
 
Heat treatment of JIS G3460 STPL380 

Grade	Heat treatment
STPL380	Normalized, Normalized, Post-tempered, Or quenching and tempering

 
 
Chemical composition of JIS G3460 STPL380 

Letter symbol of grade	Chemical Composition %
	C	Si	Mn	P	S	Ni
STPL 380	0.25 max.	0.35 max.	1.35 max.	0.035 max.	0.035 max.	-

 

Mechanical properties of JIS G3460 STPL380 

Letter symbol of grade	Mechanical properties
	Tensile strength	Yield point or proof stress	Elongation %
	kgf/mm2 {N/mm2}	kgf/mm2 {N/mm2}	No. 11 or No. 12 test piece	No. 5 test piece	No. 4 test piece
			Longitudinal	Transverse	Longitudinal	Transverse
STPL 380	39 {382}min.	21{206} min.	35 min.	25 min.	30 min.	22 min.

 
Note 1N / mm2 = 1 MPa
Note) For tubes with an outside diameter of less than 40 mm, the elongation in this table does not apply.
 

 
Dimensional tolerances
Tolerances on Outside Diameter, Wall Thickness and Deviation in Wall Thickness

Division	Tolerance on outside diameter	Tolerance on wall thickness	Tolerances on deviation in wall thickness
Hot-finished seamless steel pipe	Up to 50 mm 【 0.5mm	Up to 4mm【0.5mm	Within 20% of wall thickness
	50mm or over,【1% up to 160mm	4mm and over【12.5%
	160mm and over,【1.6mm up to 200mm
	200mm or over 【 0.8%
	However, for pipes 350mm or over in diameter, the length of circumference may be used as a bases for tolerance. In this case, the tolerances shall be 【 0.5%
Cold-finished seamless steel pipe, electric-resistance welded pipe	Up to 40mm 【 0.3mm	Up to 2mm【0.2mm	-
	40mm and over 【 0.8%	2mm and over【10%
	However, for pipes 350mm or over in diameter, the length of circumference may be used as a bases for tolerances. In this case, the tolerance shall be 【 0.5 %

 
Appearance
a) tube must be practical and straight and both ends are perpendicular to the tube axis.
b) the inner surface of the tube is good in finishing, and there is no defect which is harmful to use.
c) in the case of surface treatment, it may be necessary for grindstone or machining, but the thickness of the product after the care must be within the tolerance of thickness.
d) the ruins must be smoothly formed in the shape of the tube.
 
Testings
Analysis testing
Mechanical testing
Tensile testing
Flattening testing
Bending testing
Charpy impact testing
Hydraulic or non-destructive testing

Marking
a) type of symbol
b) a symbol representing a manufacturing method
The symbols representing the manufacturing method are as follows. However,-may be blank.
1) Hot finish seamless steel pipe -S-H
2) Cold finish seamless steel pipe -S-C
3) Electric resistance welded as-is steel pipe -E-G
4) Hot finish electric resistance welded steel pipe -E-H
5) Cold finish electric resistance welded steel pipe -EC
 
c) Dimensions. The dimensions indicate the nominal diameter and nominal thickness, or the outer diameter and thickness.
Example 50A × Sch40 or 60.5 × 3.9
d) Manufacturer name or its code
e) Symbol Z representing designation of special quality regulations (when designated)

Report
We will submit inspection documents to the order.