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01
GOST 9941 Seamless Stainless Steel Pipes for Corrosion-Resistant and Heat-Resistant Applications
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)
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.
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.
Mechanical Properties
- Tensile strength, yield strength, elongation requirements are specified per steel grade.
- Hardness limits may apply for certain grades.
Inspection & 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).
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.
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.
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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