GOST 9941 Seamless Stainless Steel Pipes for Corrosion-Resistant and Heat-Resistant Applications

 1. Scope  

GOST 9941 specifies the requirements for seamless stainless steel pipes used in corrosion-resistant and heat-resistant applications, including those for mechanical engineering, chemical industries, and high-temperature service.  

 2. Ordering Information  

When ordering pipes under GOST 9941, the following must be specified:  

- Pipe dimensions (outer diameter, wall thickness, length)  

- Steel grade (chemical composition)  

- Mechanical properties (if special requirements apply)  

- Heat treatment condition  

- Type of testing and inspection (non-destructive testing, hydrostatic testing, etc.)  

- Additional requirements (surface finish, end preparation, marking, packaging)  

 3. Steel Grades and Chemical Composition  

The standard covers austenitic, ferritic, and martensitic stainless steels, including but not limited to:  

- Austenitic: 12Х18Н10Т (AISI 321), 08Х18Н10 (AISI 304), 10Х17Н13М2Т (AISI 316Ti)  

- Ferritic: 08Х13 (AISI 409), 12Х17 (AISI 430)  

- Martensitic: 20Х13 (AISI 420), 30Х13 (AISI 420 mod.)  

Exact chemical composition limits are specified in the standard for each grade.  

 4. Manufacturing and Heat Treatment  

- Pipes are produced by hot rolling, cold rolling, or cold drawing.  

- Mandatory heat treatment (annealing, quenching, tempering) depending on the steel grade.  

 5. Mechanical Properties  

- Tensile strength, yield strength, elongation requirements are specified per steel grade.  

- Hardness limits may apply for certain grades.  

 6. Inspection and Testing Requirements  

- Hydrostatic testing (unless exempted for certain applications).  

- Non-destructive testing (NDT) (ultrasonic or eddy current testing as required).  

- Visual inspection for surface defects.  

- Dimensional checks (outer diameter, wall thickness, straightness).  

- Chemical analysis (verification of composition).  

- Mechanical tests (tensile, hardness, flattening, flaring, or bending tests if specified).  

 7. Surface Quality & Defect Limitations  

- Pipes must be free from cracks, laps, and other harmful defects.  

- Minor surface imperfections may be allowed if within permissible limits.  

 8. Marking and Packaging  

- Each pipe must be marked with:  

  - Manufacturer’s name/trademark  

  - Steel grade  

  - Heat number  

  - Pipe dimensions  

  - Standard designation (GOST 9941)  

- Packaging must ensure protection against damage during transport.  

 9. Certification & Compliance  

- Manufacturer must provide a certificate of compliance with test results.  

- Optional third-party inspection if specified in the order.  

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