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JIS G3458 STPA22 Alloy Steel Pipes
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JIS G3458 STPA22 Alloy Steel Pipes
JIS G3458 STPA22 Alloy Steel Pipes mainly used form high temperature service.
Standard:JIS G3458
This Japanese Industrial Standard specifies the alloy steel pipes,mainly used form high temperature service.
JIS G3458 STPA22 Alloy Steel Pipes Quick Details
Type:Seamless; Hot finished,Cold finished
Wall thickness(WT): 12.7mm——26 mm.
Outer diameter (OD): 19.05mm——219.1mm
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
Pipes are manufactured seamlessly and the finishing method is as per Table 1.
Table 1-manufacturing methods
| Grades | Symbol indicating the manufacturing method | |||
| Pipe making method | Finishing method | Display of symbols representing manufacturing methods | ||
| Chrome molybdenum steel pipe | STPA22 | No seam: S | Hot finish: H Cold finish: C |
A note representing the manufacturing method The indication of the item is according to Clause 12 b). |
The pipe is subjected to the heat treatment in Table 2.
Table 2-Heat treatment
| Grades | Heat treatment |
| STPA22 | Low temperature annealing, isothermal annealing, full annealing, or normalizing and post tempering |
The end of the pipe is plain end unless otherwise specified.
Chemical composition of JIS G3458 STPA22
Table 3-Chemical composition
| Letter symbol of grade | Chemical Composition % | ||||||
| C | Si | Mn | P | S | Cr | Mo | |
| STPA 22 | 0.15max. | 0.50 max. | 0.30~0.60 | 0.035 max. | 0.035 max. | 0.80~1.25 | 0.45~0.65 |
Mechanical properties of JIS G3458 STPA22
Table 4-Tensile strength, yield point or yield strength, and elongation
| Grade | Mechanical properties | |||||
| Tensile strength | Yield point or proofstress | 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 | |||
| STPA 22 | 42{412}min. | 21{206} min. | 30 min. | 25 min. | 24 min. | 19 min. |
Note 1N / mm2 = 1 MPa
Note) For pipes with an outer diameter of less than 40 mm, the elongation values in this table do not apply. However, it must be recorded.
Dimensional Tolerances
Table 5 Tolerances on Outside Diameter, Wall Thickness and Deviation in Wall Thickness
| Division | Tolerances on outside diameter | Tolerances on wall thickness | Tolerance on deviation in wall thickness |
| Up to 50mm 【 0.5mm | ≤Up to 4mm 【 0.5mm ≤4mm and over 【 12.5% |
Up to and incl. 20% of wall thickness |
|
| Hot finished seamless steel pipe |
50mm and over, up to 160mm 【 1% | ||
| 160mm and over, up to 200mm 【 1.6mm | |||
| 200mm and over 【 0.8 % | |||
| However, for pipes 350mm and over in diameter, the length of circumference may substitute as | |||
| a basis for the tolerances. In this case, the tolerances shall be 【 0.5%. | |||
| Cold finished seamless steel pipe |
Up to 40mm 【 0.4mm | ≤Up to 2mm 【 0.2mm ≤2mm and over 【10% |
---- |
| 40mm and over 【 0.8% However, for pipes 350mm and over in diameter, the length of circumference may substitute as |
|||
| a basis for tolerances. Inthis case, the tolerances shall be 【 0.5% |
Appearance
a) The pipe should be practically straight and at both ends perpendicular to the pipe axis.
b) The inner and outer surfaces of the pipe shall be well finished and have no detrimental disadvantages in use.
c) If surface treatment is to be carried out, it may be by grinder or machining.
d) The marks of care must follow the shape of the tube smoothly.
Test
Analysis test
Tensile test
Flattening test
Water pressure test or nondestructive test
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
c) Dimensions. The dimensions are nominal diameter × nominal thickness, or outer diameter × thickness.
Example 50A × Sch40 or 60.5 × 3.9
d) Manufacturer name or its code
e) Symbol indicating the designation of special quality regulations: Z (when designated)
Report
We will submit the inspection documents to the orderer.
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