GOST 9941-2022 defines the technical conditions for seamless stainless steel pipes in pressure and high-purity applications across Russia and CIS regions. Understanding this standard is crucial for suppliers targeting LNG, petrochemical, and high-purity pipeline systems.
This guide explains the scope, dimensional standards, material grades, and mechanical properties of GOST 9941-2022 and how YIGE Steel can support your project with compliant solutions.
Let’s explore how GOST 9941-2022 compares to EN and ASTM standards, and what you should consider when sourcing for cryogenic or high-purity applications.
Overview of the Standard (Scope, Applications, Structure)
GOST 9941-2022 is a Russian national standard for seamless stainless steel pipes used in high-pressure and high-purity environments. It replaces the earlier GOST 9941-81 version and aligns more closely with ISO and EN requirements.
The standard applies to:
- Seamless cold- or hot-deformed stainless steel pipes
- Used in cryogenic, corrosive, or high-temperature environments
- Common in LNG, petrochemical, food-grade, and pharmaceutical industries
It specifies:
- Dimensional tolerances
- Surface condition requirements
- Mechanical properties
- Acceptance and test procedures
Dimensional and Tolerance Requirements (OD, WT, Length)
GOST 9941-2022 provides a clear dimensional range:
- Outer Diameter (OD): 6 mm to 530 mm
- Wall Thickness (WT): 0.5 mm to 30 mm
- Pipe Length:
- Random (4–12 m)
- Fixed length available upon agreement
Tolerances:
- OD: ±0.5% to ±1% depending on size and manufacturing method
- WT: ±10% typical
- Straightness: max 1.5 mm per meter
- Surface: free from scale, cracks, dents; pickling or bright annealing required
These tolerances support high precision applications, including vacuum and clean-gas lines.
Material Grades and Chemical Composition
GOST 9941-2022 references a wide range of austenitic and ferritic stainless steels. Some common grades include:
| GOST Grade | Equivalent | Typical Application |
|---|---|---|
| 08Х18Н10Т | AISI 321 / 1.4541 | High-temp, stabilized |
| 12Х18Н10Т | AISI 321 / 1.4541 | Corrosion-resistant, LNG pipelines |
| 10Х17Н13М2Т | AISI 316Ti / 1.4571 | Marine, chloride resistance |
| 06ХН28МДТ | – | Heat-exchanger tubes |
All grades follow GOST 5632 for chemical requirements and guarantee strict limits on carbon, sulfur, and phosphorus to improve weldability and corrosion resistance.
Mechanical Properties (Yield, Tensile, Elongation, Impact)
Depending on the steel grade and pipe condition (annealed or normalized), mechanical requirements typically include:
- Yield Strength: ≥ 205 MPa (for austenitic steels)
- Tensile Strength: 500–750 MPa
- Elongation (A50): ≥ 35%
- Impact Toughness: Tested at room or sub-zero temperatures for critical applications (e.g., LNG)
Pipes intended for low-temperature operation (e.g., cryogenic LNG gas recovery systems) often require certification via separate impact testing.
Typical Applications and Recommended Uses
GOST 9941-2022 pipes are widely used in high-demand environments requiring corrosion resistance, pressure endurance, and precision:
- LNG pipelines and vapor recovery
- Cryogenic tanks and filling stations
- Petrochemical plants (acids, solvents, high-temp flowlines)
- Pharmaceutical and food-grade fluid transport
- High-purity gas lines in semiconductor industries
- Nuclear power and steam lines
Because of their high cleanliness and mechanical strength, they are also used in vacuum systems and steam recovery setups.
Comparison with Other Standards (EN 10216-5, ASTM A312)
| Standard | Region | Process | Key Difference |
|---|---|---|---|
| GOST 9941-2022 | Russia/CIS | Seamless | Strict Ra control, widely used in LNG and vacuum |
| EN 10216-5 | EU | Seamless | Broader coverage, similar grades, CE marking |
| ASTM A312 | US | Seamless/Welded | More flexible on tolerances, commonly used in oil & gas |
GOST 9941-2022 is favored in Russia and CIS markets, especially for projects that require precise surface finish (Ra ≤ 3.2μm) and traceable metallurgy.
Our Supply Capability and Compliance
YIGE Steel supports full compliance with GOST 9941-2022, particularly for customers working in:
- LNG cryogenic lines
- Steam recovery units
- Petrochemical processing
We offer:
- Material: 06Cr19Ni10 (12Х18Н10Т), 304/316L, others
- Size: 57×3mm and beyond
- Surface Options: Pickling, polished (Ra ≤ 3.2μm), shot blasting
- Certificates: Mill Test Certificate (EN10204 3.1), Impact Testing, GOST compliance
- MOQ: 1 ton
- Quick delivery: Fast-track available for standard sizes
We help you convert project drawings into precise pipe supply — with support in unit conversion, Ra confirmation, and custom cutting.
Conclusion
GOST 9941-2022 is a crucial standard for stainless steel piping in pressure and purity-sensitive industries, especially across Russia, Central Asia, and LNG applications. With its precise mechanical and surface requirements, it ensures safety and longevity under extreme conditions.
At YIGE Steel, we provide tailor-made solutions that meet or exceed GOST 9941-2022 — with technical consultation, dimensional precision, and full compliance. Let us be your partner in high-purity and cryogenic pipe supply.
