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Seamless Stainless Steel Pipes for Corrosion & Heat Resistance - China Suppliers & Factory GOST 9941
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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Frequently Asked Questions (FAQ)
What is GOST 9941 and what does it cover?
GOST 9941 is a Russian standard that specifies requirements for seamless cold-drawn and cold-rolled stainless steel pipes used in corrosion-resistant and heat-resistant applications. It covers dimensions, steel grades, mechanical properties, heat treatment, testing, marking, and packaging.
Which stainless steel grades are available under GOST 9941?
The standard includes austenitic grades such as 12Х18Н10Т (AISI 321) and 08Х18Н10 (AISI 304), ferritic grades like 08Х13 (AISI 409) and 12Х17 (AISI 430), and martensitic grades such as 20Х13 (AISI 420) and 30Х13 (AISI 420 mod.).
What information is required when placing an order for GOST 9941 pipes?
When ordering, you must specify pipe dimensions (outer diameter, wall thickness, length), steel grade, mechanical property requirements, heat treatment condition, testing types, and any additional requirements such as surface finish, end preparation, and packaging.
What testing and inspection methods are applied to GOST 9941 pipes?
Pipes undergo hydrostatic testing, non-destructive testing (ultrasonic or eddy current), visual inspection, dimensional verification, chemical composition analysis, and mechanical tests including tensile, hardness, flattening, flaring, or bending tests as specified.
How are GOST 9941 pipes manufactured?
Pipes are produced through hot rolling, cold rolling, or cold drawing processes. Mandatory heat treatment — such as annealing, quenching, or tempering — is applied depending on the steel grade to achieve the required mechanical and corrosion-resistant properties.
Is a certificate of compliance provided with GOST 9941 pipes?
Yes. The manufacturer is required to provide a certificate of compliance that includes test results. Optional third-party inspection can also be arranged if specified at the time of ordering.