gnee pipe team
GB3087 low and medium pressure boiler tubes: used to manufacture various low and medium pressure boilers, superheated steam pipes, boiling water pipes, water-cooled wall tubes and superheated steam pipes for locomotive boilers, large smoke pipes, small smoke pipes and arch brick pipes, etc. Hot-rolled or cold-rolled (dialed) seamless steel pipes are made of high-quality carbon structural steel. Mainly made of No. 10 and No. 20 steel, in addition to ensuring the chemical composition and mechanical properties, hydrostatic tests, curling, flaring, flattening and other tests are required. Hot-rolled products are delivered in a hot-rolled state, and cold-rolled (rolled) products are delivered in a heat-treated state.
Equivalent steel number
| Grade | Standard | Country |
| 10 | GB 3087 | China |
| ST35.8 | DIN 17175 | Germany |
| STB340 | JIS G3461 | Japan |
Chemical composition of GB 3087 Grade 10 steel pipe
| Standard | Grade | Chemical Composition(%) | |||||||
| C | Si | Mn | P | S | Cr | Cu | Ni | ||
| GB3087 | 10 | 0.07～0.13 | 0.17～0.37 | 0.38～0.65 | ≤0.030 | ≤0.030 | 0.3～0.65 | ≤0.25 | ≤0.30 |
Grade 10 Seamless pipe
Mechanical properties of GB 3087 Grade 10 Seamless pipe
| Standard | Steel pipe | Wall thickness (mm) |
Tensile strength (MPa) |
Yield Strength (MPa) |
Elongation % |
| ≥ | |||||
| GB3087 | 10 | / | 335～475 | 195 | 24 |
Process testing
Steel pipes should be hydrostatically tested one by one.
Eddy current testing can be used instead of hydraulic testing. Ultrasonic flaw detection or magnetic flux leakage detection can also be used instead of hydraulic flaw detection. When eddy current flaw detection is used, the Class A hole of GB/T 7735-1994 should be used; when ultrasonic flaw detection is used, the depth grade of the longitudinal notch groove on the outer surface of the comparison sample pipe should comply with the requirements of C8 in GB/T5777-1996; The outer surface of the comparison sample pipe The longitudinal notch groove should comply with the provisions of N12.5 in GB/T 12606-1999, with a minimum depth of 0.5mm and a maximum depth of 1.5mm.
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