Hebei Haihao Group, as an integrated industrial and trading comprehensive service provider, leverages its advantages in whole-industry-chain collaboration to offer customers one-stop solutions encompassing material selection, customized production, and international logistics. Recently, we successfully fulfilled an order for a Latvian client, delivering a batch of GOST 8734-75 20# seamless pipes. The technical specifications of these products are as follows:
GOST 8734-75 20# seamless pipes
Key Product Parameters
- Standard Compliance: GOST 8734-75 (Russian national standard for seamless steel tubes, applicable to general-purpose seamless pipes)
- Material Specification: 20# steel (in accordance with ГОСТ 1050-2013, specifying chemical composition for carbon structural steels)
- Manufacturing Process: Advanced cold deformation precision forming technology, employing multi-pass cold rolling/drawing processes to ensure dimensional accuracy reaching H9 tolerance class
- Length Specifications: Single pipe length ranges from 6 to 10 meters (customizable cutting services available upon request)
Chemical Composition Control (Unit: wt%)
| Element | C | Mn | P | S | Si | Cr | Cu | Ni |
|---|---|---|---|---|---|---|---|---|
| Content Range | 0.17-0.24 | 0.35-0.65 | ≤0.030 | ≤0.035 | 0.17-0.37 | ≤0.25 | ≤0.30 | ≤0.30 |
Room Temperature Mechanical Properties
| Parameter | Minimum Requirement |
|---|---|
| Temporary resistor | 412 N/mm² |
| Yield Strength (Rp0.2) | 245 N/mm² |
| Elongation After Fracture | 21% |
| Brinell Hardness | ≤156 HB |
Quality Assurance System
- Material Traceability: Each pipe batch equipped with furnace number tracking system, accompanied by electric arc furnace steelmaking + LF refining process records
- Inspection Protocol: 100% ultrasonic testing (UT) and eddy current testing (ET) for non-destructive quality verification
- Certification: Acquired Eurasian Economic Union EAC Certification (CU-TR), compliant with TP TC 032/2013 pressure equipment safety regulations
Application Domains
This batch of 20# cold-deformed seamless pipes, with their superior comprehensive performance, is particularly suitable for:
- Oil and gas transmission pipelines (resistant to sulfide stress corrosion)
- Hydraulic machinery manufacturing (featuring high-precision internal bore surface roughness ≤1.6μm Ra)
- Boiler and pressure vessel applications (validated through -20°C low-temperature impact testing)
- Automotive drive shafts and construction machinery structural components
Hebei Haihao Group remains committed to maintaining a comprehensive “material performance database,” supported by ISO 9001 quality management system certification. We provide metal material solutions compliant with multiple international standards including GOST, ASTM, and DIN, striving to become a reliable bridge connecting global industrial demands and contributing to infrastructure development along the “Belt and Road” initiative.
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