Application of JIS G 3456 Carbon (ERW) Seamless Steel Pipe
Pipe ordered under this specification is used mainly for piping subjected to a temperature over 350℃。For example: transporting steam,water etc.Details of JIS G 3456 Carbon (ERW) Seamless Steel Pipe We can supply
Manufacture:seamless pipe (hot finished or cold finished) / Electric resistance welded pipe Size: O.D.: 15.0～660mm W.T.: 2～50mm Grade:STPT370 ,STPT410,STPT480 Length: 6M or specified length as required. Ends: Plain End, Beveled End.Manufacturing Process of JIS G 3456 Carbon (ERW) Seamless Steel Pipe
By a seamless process: hot finished and cold finished Electric resistance weldedChemical Composition and mechanical properties JIS G3456 (Carbon ERW) Alloy Seamless Steel tubes
Grade and Chemical Composition (％)| Grade | C≤ | Si | Mn | P≤ | S≤ |
| STPT370 | 0.25 | 0.10~0.35 | 0.30~0.90 | 0.035 | 0.035 |
| STPT410 | 0.30 | 0.10~0.35 | 0.30~1.00 | 0.035 | 0.035 |
| STPT480 | 0.33 | 0.10~0.35 | 0.30~1.00 | 0.035 | 0.035 |
| Mechanical Properties | ||||||
| Grade | Tensile strength | Yield strength | Elongation % | |||
| N/ m㎡ | N/ m㎡ | No.11 or No.12 test pieces | No. 5 test pieces | No. 4 test piece | ||
| Longitudinal | Transverse | Longitudinal | Transverse | |||
| STPT370 | 370 min | 215 min | 30 min | 25 min | 28 min | 23 min |
| STPT410 | 410 min | 245 min | 25 min | 20 min | 24 min | 19 min |
| STPT480 | 480 min | 275 min | 25 min | 20 min | 22 min | 17 min |
| 1. The above elongation value is not applicable to tubes with outer diameter <40mm. But it must be recorded.2. The sample meets the requirements of JIS Z2201 standard; 3. For the tube with wall thickness <8mm, when the sample No. 12 or No. 5 is used, the minimum value of the elongation is reduced by 1mm according to the wall thickness, and 1.5% is subtracted from the above value. | ||||||
Tolerance of outside diameter and wall thickness
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- Tolerance of OD and W.T
Division
Tolerance on O.D
Tolerance on W.T
Hot finished Seamless Steel Pipe
D＜50m
±0.5 mm
S＜4mm
S≥4mm
±0.5mm
±12.5%
50mm≤D＜160mm
±1%
160mm≤D＜200
±1.6 mm
D≥200mm
±0.8%
Cold finished Seamless Steel Pipe
D＜40m
±0.3 mm
S＜2mm
±0.2mm
D≥40mm
±0.8%
S≥2mm
±10%
ERW Steel Pipe D＜40m
±0.3 mm
S＜2mm
±0.2mm
D≥40mm
±0.8%
S≥2mm
±10%
For pipes of nominal size 350A or over,the tolerance on O.D maybe determined by the circumferential length. In this case,the tolerance shall be +/-0.5%
- Tolerance of OD and W.T
Appearance for JIS G3441 Alloy Seamless Steel tubes
Practicality is straight, the end is cut perpendicularly, and there are no harmful defects on the inner and outer surfaces. Defects can be removed, but the minimum wall thickness must be ensured.Delivery Condition
Hot finished seamless(ERW) steel pipe: Low temperature annealing or normalizing maybe applied Cold finished seamless(ERW) steel pipe: low temperature annealing or normalizingMarking
Grade Manufacture method code(hot finished seamless steel pipe: S-H; Cold finished seamless steel pipe: S-C). Dimensions(nominal diameter X nominal wall thickness or outside diameter X wall thickness). Manufacturer’s name or its identifying brand. Manufacture method(hot finished ERW steel pipe: E-H; Cold finished ERW steel pipe: E-C). Dimensions(nominal diameter X nominal wall thickness or outside diameter X wall thickness). Symbol Z to denominate the special quality requirement.Packing for JIS G3441 Alloy Seamless Steel tubes
Bare pipe, black coating ( customized); 6" and below sizes In bundles with two cotton slings, other sizes in loose; Both ends with end protectors; Plain end, bevel end (Positive deviation is allowed, and no negative deviation is allowed) Marking.