Haihao Group recently completed the production and shipment of a batch of GOST 8734-75 cold drawn seamless steel pipes for a customer in Latvia. The order includes precision cold drawn seamless tubes manufactured from ST20 carbon steel, with strict requirements for mechanical performance, hydrostatic testing, and non-destructive inspection.
As industrial projects in Eastern Europe continue to demand higher dimensional accuracy and stable mechanical properties, GOST 8734-75 cold drawn seamless steel pipe products are widely used in pressure systems, machinery manufacturing, heat exchange equipment, hydraulic applications, and structural engineering projects.
The supplied pipes were manufactured in accordance with the customer’s technical specifications and underwent comprehensive quality control procedures before delivery.
Haihao Group GOST 8734 75 ST20 cold drawn seamless steel pipes
Product Specification Overview
| Product | Specification | Material | Standard | Length |
| Cold Drawn Seamless Steel Pipe | 48 × 1.5 mm | ST20 / 20# Steel | GOST 8734-75 | 7–9 meters |
Technical Requirements for the ST20 Seamless Pipe
To ensure reliable performance under industrial operating conditions, the customer required the pipes to meet strict chemical composition and mechanical property standards.
Chemical Composition of ST20 Steel
| Element | Requirement |
| Carbon (C) | 0.17 – 0.24% |
| Manganese (Mn) | 0.35 – 0.65% |
| Phosphorus (P) | ≤ 0.03% |
| Sulfur (S) | ≤ 0.035% |
| Silicon (Si) | 0.17 – 0.37% |
| Chromium (Cr) | ≤ 0.25% |
| Copper (Cu) | ≤ 0.30% |
| Nickel (Ni) | ≤ 0.30% |
Mechanical Properties at Room Temperature
| Property | Minimum Requirement |
| Tensile Strength | 412 N/mm² |
| Yield Strength | 245 N/mm² |
| Elongation | 21% |
| Hardness | ≤ 156 HB |
Why Choose GOST 8734-75 Cold Drawn Seamless Steel Pipes?
Compared with ordinary hot-finished tubes, GOST 8734-75 cold drawn seamless steel pipe products offer several important advantages:
- Higher dimensional precision
- Better surface finish
- Improved mechanical consistency
- Excellent pressure resistance
- Reliable weldability and machinability
- Stable performance in hydraulic and mechanical systems
These characteristics make cold drawn seamless pipes especially suitable for industries that require strict tolerance control and dependable long-term operation.
Comprehensive Inspection and Testing
Before shipment, Haihao Group carried out multiple inspection procedures to ensure product reliability and compliance with project requirements.
Inspection Scope
| Inspection Item | Status |
| Hydrostatic Pressure Test | Completed |
| Non-Destructive Testing (NDT) | Completed |
| Dimensional Inspection | Completed |
| Surface Quality Inspection | Completed |
| Mechanical Property Verification | Completed |
Applications of ST20 Cold Drawn Seamless Steel Pipe
The supplied products are commonly used in:
- Hydraulic systems
- Heat exchanger equipment
- Mechanical processing industries
- Oil and gas transportation systems
- Boiler and pressure equipment
- Structural engineering
- Industrial machinery manufacturing
Due to its balanced strength and machinability, GOST 8734-75 seamless steel tube ST20 remains one of the preferred materials for industrial projects across Europe and Central Asia.
Haihao Group Supports International Industrial Projects
With decades of manufacturing experience, Haihao Group supplies a complete range of seamless pipes, pipe fittings, flanges, and customized piping components for global customers.
Our production team strictly follows international standards including:
- GOST
- ASTM
- ASME
- EN
- DIN
- ISO
From raw material control to final inspection, every order is managed with attention to quality, delivery efficiency, and customer requirements.
If you are looking for a reliable supplier of GOST 8734-75 cold drawn seamless steel pipe, Haihao Group can provide professional technical support and stable global delivery services.
FAQ
What is GOST 8734-75?
GOST 8734-75 is a Russian standard covering cold drawn seamless steel tubes with precise dimensions and good mechanical properties for industrial applications.
What is ST20 steel?
ST20 is a low-carbon steel grade similar to 20# steel, known for good weldability, strength, and machinability.
Why are hydrostatic and NDT tests important?
These inspections help ensure the pipe can withstand pressure safely and detect internal or surface defects before delivery.
What industries use cold drawn seamless steel pipes?
These pipes are widely used in hydraulic systems, machinery manufacturing, heat exchangers, oil & gas projects, and industrial equipment.
Can Haihao Group customize seamless pipe specifications?
Yes. Haihao Group can manufacture customized sizes, wall thicknesses, materials, and inspection requirements according to project specifications.
