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JIS G3460 STPL450 Seamless Steel Tubes
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JIS G3460 STPL450 Seamless Steel Tubes
Standard:JIS G3460
Steel tubes for low temperature service
JIS G3460 STPL450 Steel tubes usually applies to pipes with an outer diameter of 10.5 mm to 660.4 mm,used at particularly low temperature below freezing.
JIS G3460 STPL450 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 of JIS G3460 STPL450
(1)The tube is made of fine-grained killed steel, STPL 450 and STPL 690 are manufactured seamlessly.
(2)The pipe is heat-treated in Table 1. However, when performing heat treatments other than those in Table 1, it is based on the agreement between the delivery parties. Cold-finished tubes are heat-treated after cold-finishing.
Table 1-Heat treatment
| Grade | Heat treatment |
| STPL450 | Normalized, Normalized, Post-tempered, Or quenching and tempering |
c) The end of the pipe is plain end unless otherwise specified. If the orderer specifies a bevel end, the shape shall be in accordance with the agreement between the delivering and receiving parties, in particular when no shape is specified, according to Figure 1.
Chemical composition of JIS G3460 STPL450
|
Letter symbol of grade |
Chemical Composition % | |||||
| C | Si | Mn | P | S | Ni | |
| STPL 450 | 0.18 max. | 0.10~0.35 | 0.30~0.60 | 0.030 max. | 0.030 max. | 3.20 ~ 3.80 |
| STPL 690 | 0.13 max. | 0.10~0.35 | 0.90 max. | 0.030 max. | 0.030 max. | 8.50 ~ 9.50 |
Mechanical properties of JIS G3460 STPL450
| 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 450 | 46{451}min | 25{245} min. | 30 min. | 20 min. | 24 min. | 16 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.
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