Customization: | Available |
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Type: | Seamless |
Technique: | Cold Drawn |
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Process | Tolerance on outside diameter | Tolerance on wall thickness | ||
Hot Rolled Seamless Pipes |
<=50mm | ±0.5mm | <=4mm | ±0.5mm |
>50-160mm | ±1% | |||
>160-200mm | ±1.6mm | >4mm | ±12.5% | |
>200mm | ±0.8% | |||
More that 350mm, the Tolerance is ±0.5% |
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Cold Drawn Seamless Pipes and Electric Resistant Welded Pipes |
<=40mm | ±0.3mm | <=2mm | ±0.2mm |
>40mm | ±0.8% | >2mm | ±10% | |
More than 350 mm the Tolerance is ±0.5% |
Grade | C | Si | Mn | P | S | Cr | Mo |
STPA 12 | 0.10~0.20 | 0.10~0.50 | 0.30~0.80 | 0.035 max. | 0.035 max. | - | 0.45~0.65 |
STPA 20 | 0.10~0.20 | 0.10~0.50 | 0.30~0.60 | 0.035 max. | 0.035 max. | 0.50~0.80 | 0.45~0.65 |
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 |
STPA 23 | 0.15max. | 0.50~1.00 | 0.30~0.60 | 0.030 max. | 0.030 max. | 1.00~1.50 | 0.45~0.65 |
STPA 24 | 0.15max. | 0.50 max. | 0.30~0.60 | 0.030 max. | 0.030 max. | 1.90~2.60 | 0.87~1.13 |
STPA 25 | 0.15max. | 0.50 max. | 0.30~0.60 | 0.030 max. | 0.030 max. | 4.00~6.00 | 0.45~0.65 |
STPA 26 | 0.15max. | 0.25~1.00 | 0.30~0.60 | 0.030 max. | 0.030 max. | 8.00~10.00 | 0.90~1.10 |
Grade | 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 | |||
STPA 12 | 39{382}min. | 21{206} min. | 30 min. | 25 min. | 24 min. | 19 min. |
STPA 20 | 42{412}min. | 21{206} min. | 30 min. | 25 min. | 24 min. | 19 min. |
STPA 22 | 42{412}min. | 21{206} min. | 30 min. | 25 min. | 24 min. | 19 min. |
STPA 23 | 42{412}min. | 21{206} min. | 30 min. | 25 min. | 24 min. | 19 min. |
STPA 24 | 42{412}min. | 21{206} min. | 30 min. | 25 min. | 24 min. | 19 min. |
STPA 25 | 42{412}min. | 21{206} min. | 30 min. | 25 min. | 24 min. | 19 min. |
STPA 26 | 42{412}min. | 21{206} min. | 30 min. | 25 min. | 24 min. | 19 min. |