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Tianjin Sanon Steel Pipe Co., Ltd. is a stockist. Our stock factory is in Cangzhou City, Hebei Province. Our main sources of goods are boiler pipes, and the representative materials are ASTM A335 P5/P11/P91/P92, ASME SA-106/SA-106M GR.B, GB/T 3087-2008 10#/20#. The representative materials of pipeline pipes are API 5L, API 5CT, the representative materials of petroleum cracking pipes GB/T 9948 are 15MoG/12CrMoVG. GB/T 6479-2013 represents the material 10#/20#, heat exchanger tubes SA179/SA210/SA192, etc., mechanical tubes GB/T 8162 represent the material 10#/20#/Q345/42CrMo, EN10210 represents the material S355JOH/S355J2H, gas cylinder tubes GB1 8248, represent the material 34CrMo4/30CrMo.
Sanonpipe – Your Trusted GOST Standard Steel Pipe Supplier for the Russian Market
1. Overview of the Russian GOST Seamless Steel Pipe Standard System
The Russian GOST standard system is one of the most rigorous industrial standards in the world, widely applied in oil, gas, chemical, power, construction, and machinery manufacturing sectors. For hot‑rolled seamless steel pipes, the core standards consist of dimension specifications and technical conditions – both must be used together and are inseparable.
| Standard | Full Name | Purpose |
|---|---|---|
| GOST 8732-78 | Hot‑deformed seamless steel pipes – Dimensional range | Specifies outside diameter, wall thickness, length and other dimensional parameters |
| GOST 8731-74 | Hot‑deformed seamless steel pipes – Technical conditions | Specifies chemical composition, mechanical properties, inspection rules, etc. |
Important Note: GOST 8732-78 will be replaced by GOST 8732-2025 on March 1, 2026. sanonpipe can supply products conforming to both the old and new standards, ensuring full compliance for your projects.
2. GOST 8732-78: Detailed Dimensional Standard
GOST 8732-78 applies to general‑purpose hot‑deformed (hot‑rolled) seamless steel pipes, manufactured according to outside diameter, wall thickness and length.
Dimensional range:
Typical outside diameters: 32 – 426 mm
Wall thickness: adjusted according to application
Length: available in random or fixed lengths, up to 30 metres
Outside diameter tolerances:
| OD range | Permissible deviation |
|---|---|
| 32 – 50 mm | ± 0.5 mm |
| 51 – 219 mm | ± 1% |
Wall thickness tolerances:
| Wall thickness range | Permissible deviation |
|---|---|
| 3 – 15 mm | +12.5% / –15% |
| 16 – 30 mm | ± 12.5% |
| 32 – 45 mm | +10% / –12.5% |
3. Material Steel 20 (Ст20) Explained
Steel 20 (Russian designation Ст20) is the most commonly used quality carbon structural steel in Russian standards, widely applied in pressure piping and structural components.
Chemical composition (%)
| Element | Content range |
|---|---|
| C (Carbon) | 0.17 – 0.24 |
| Si (Silicon) | 0.17 – 0.37 |
| Mn (Manganese) | 0.35 – 0.65 |
| S (Sulphur) | ≤ 0.040 |
| P (Phosphorus) | ≤ 0.035 |
| Cr (Chromium) | ≤ 0.15 |
| Ni (Nickel) | ≤ 0.30 |
| Cu (Copper) | ≤ 0.30 |
Mechanical properties
| Property | Value |
|---|---|
| Tensile strength (σb) | ≥ 410 MPa |
| Yield strength (σs) | ≥ 245 MPa |
| Elongation after fracture (δ5) | ≥ 21% – 24% |
| Impact toughness | ≥ 35 J/cm² |
| Hardness (HB) | ≤ 207 HB |
International equivalent grades
| Standard system | Equivalent grade |
|---|---|
| China (GB) | 20# / 20G |
| USA (ASTM) | A106 Gr.B |
| Europe (EN) | P235GH |
| Germany (DIN) | St45.8 |
Typical application areas
Thanks to its excellent overall performance, Steel 20 seamless steel pipes are widely used in the following fields:
Oil & gas: oil and gas transmission pipelines, high‑pressure drilling
Power industry: boiler tubes, superheaters, economisers
Chemical industry: pressure vessels, chemical pipelines
Construction & machinery: building structures, mechanical parts, hydraulic cylinders
4. Supporting Standard System
sanonpipe supplies products in strict accordance with the complete GOST standard system, ensuring full compliance with Russian market access requirements:
| Standard | Role |
|---|---|
| GOST 8732-78 | Dimensional specifications (OD, wall thickness, length) |
| GOST 8731-74 | Technical conditions (chemical composition, mechanical properties, inspection rules) |
| GOST 9567-75 | Dimensional specifications for high‑precision steel pipes (when tighter tolerances are required) |
Quality assurance:
Each batch is supplied with a complete MTC (Material Test Certificate)
EN 10204 3.1/3.2 certificates available upon request
Third‑party inspections by SGS, BV, TÜV etc. are supported
5. Why Choose sanonpipe?
| Our Advantages | Details |
|---|---|
| Standard expertise | Deep understanding of GOST system – accurate interpretation of Russian technical requirements |
| Material guarantee | Steel 20 fully compliant with GOST 8731‑74, equivalent to ASTM A106 Gr.B |
| Fast delivery | Relying on 20,000 tonnes of regular stock, urgent orders delivered in 7‑15 days |
| Full‑service package | From enquiry, background checks and quotation to documentation and logistics – one‑stop delivery |
| Zero‑risk commitment | 240+ internal quality control checkpoints, zero discrepancy on documents |
| Green & low‑carbon | Product carbon footprint reports available to support ESG compliance |
Example of standard specification description:
*Труба стальная бесшовная горячедеформированная 114×6 ГОСТ 8732-78 / В 20 ГОСТ 8731-74*
(Hot‑rolled seamless steel pipe 114×6, conforming to GOST 8732‑78 dimension standard, material Steel 20, conforming to GOST 8731‑74 technical conditions)
6. Contact Us
sanonpipe is committed to providing high‑quality GOST‑standard seamless steel pipe products to customers in Russia and the CIS markets. Whether you require standard specifications or custom sizes, we offer professional technical support and flexible supply solutions.
Post time: Jun-18-2026
