Haihao Group has successfully completed the production and shipment of a batch of GOST 8734-75 ST20 seamless pipe products for a valued customer in Latvia. The order consists of multiple sizes of cold drawn seamless steel pipes manufactured from ST20 carbon steel, meeting the dimensional tolerance, mechanical property, and chemical composition requirements specified by the customer.
As an experienced manufacturer of industrial piping products, Haihao Group continues to provide customized solutions for customers across Europe, supplying high-quality seamless steel pipes for machinery manufacturing, pressure equipment, heat exchangers, hydraulic systems, and industrial pipeline projects.
Product Specification
| Product | Size | Material | Standard | Length |
| Cold Drawn Seamless Steel Pipe | 22.0 × 1.5 mm | ST20 | GOST 8734-75 | 5–8 m |
| Cold Drawn Seamless Steel Pipe | 10.0 × 1.0 mm | ST20 | GOST 8734-75 | 6 m Fixed Length |
| Cold Drawn Seamless Steel Pipe | 20.0 × 1.4 mm | ST20 | GOST 8734-75 | 6 m Fixed Length |
| Cold Drawn Seamless Steel Pipe | 16.0 × 3.5 mm | ST20 | GOST 8734-75 | 7–8 m |
| Cold Drawn Seamless Steel Pipe | 12.0 × 2.0 mm | ST20 | GOST 8734-75 | Approx. 7 m |
Precision Manufacturing for European Standards
This shipment features GOST 8734-75 ST20 seamless pipe manufactured through the cold drawing process, providing excellent dimensional accuracy and smooth surface quality. Tight tolerance control helps ensure reliable installation in precision mechanical equipment and industrial piping systems.
The customer’s requested dimensional tolerances include:
- Outer Diameter:±0.15 mm to ±0.30 mm (depending on size)
- Wall Thickness:±10%
- Weight Tolerance:+10/-0% or +0/-10% according to specification
Every GOST 8734-75 ST20 seamless pipe is inspected throughout production to maintain stable dimensions and consistent product quality.
GOST 8734 75 ST20 cold drawn seamless steel pipes manufactured by Haihao Group
Stable Chemical Composition
Haihao Group carefully controls the chemical composition of every heat to ensure compliance with the ST20 material specification.
| Element | Requirement |
| Carbon (C) | 0.17–0.24% |
| Silicon (Si) | 0.17–0.37% |
| Manganese (Mn) | 0.35–0.65% |
| Phosphorus (P) | ≤0.030% |
| Sulfur (S) | ≤0.035% |
| Chromium (Cr) | ≤0.25% |
| Copper (Cu) | ≤0.30% |
| Nickel (Ni) | ≤0.30% |
Strict chemical control allows the GOST 8734-75 ST20 seamless pipe to deliver reliable weldability, machinability, and mechanical performance.
Mechanical Performance and Quality Inspection
To satisfy the Latvian customer’s technical requirements, all pipes undergo comprehensive quality inspection before shipment.
Mechanical properties at room temperature include:
- Minimum Tensile Strength: 412 MPa
- Minimum Yield Strength: 245 MPa
- Minimum Elongation: 21%
- Maximum Hardness: HB 156
In addition, Haihao Group performed:
- Hydraulic Pressure Test
- Non-Destructive Testing (NDT)
- Dimensional Inspection
- Surface Quality Inspection
- Material Traceability Verification
These inspection procedures ensure every GOST 8734-75 ST20 seamless pipe complies with customer specifications before delivery.
Reliable Seamless Pipe Solutions from Haihao Group
With decades of manufacturing experience, Haihao Group supplies seamless steel pipes, pipe fittings, flanges, and customized piping products to customers worldwide. Whether your project follows GOST, ASTM, ASME, EN, DIN, or JIS standards, our engineering and production teams can provide tailored manufacturing solutions with complete quality documentation.
If you are sourcing GOST 8734-75 ST20 seamless pipe or other precision seamless steel pipes for industrial applications, Haihao Group is ready to support your project with dependable products, strict quality control, and timely delivery.
