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High-Quality Seamless Stainless Steel Pipes for Corrosion-Resistant Applications - China Suppliers & Factory
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
What is GOST 9941 and what types of pipes does it cover?
GOST 9941 is a Russian standard that specifies requirements for seamless stainless steel pipes used in corrosion-resistant and heat-resistant applications. It covers austenitic, ferritic, and martensitic stainless steel grades produced by hot rolling, cold rolling, or cold drawing.
Which steel grades are available under GOST 9941?
GOST 9941 includes a wide range of grades: austenitic grades such as 12Х18Н10Т (AISI 321), 08Х18Н10 (AISI 304), and 10Х17Н13М2Т (AISI 316Ti); ferritic grades such as 08Х13 (AISI 409) and 12Х17 (AISI 430); and martensitic grades such as 20Х13 (AISI 420) and 30Х13 (AISI 420 mod.).
What testing and inspection methods are required for GOST 9941 pipes?
Required inspections include hydrostatic testing, non-destructive testing (ultrasonic or eddy current), visual inspection for surface defects, dimensional checks, chemical composition verification, and mechanical tests such as tensile, hardness, flattening, flaring, or bending tests as specified.
What information must be included when placing an order for GOST 9941 pipes?
When ordering, you must specify the pipe dimensions (outer diameter, wall thickness, length), steel grade, mechanical property requirements, heat treatment condition, required testing types, and any additional requirements such as surface finish, end preparation, marking, and packaging.
What markings are required on GOST 9941 pipes?
Each pipe must be marked with the manufacturer's name or trademark, the steel grade, heat number, pipe dimensions, and the standard designation (GOST 9941). Packaging must also be adequate to protect the pipes from damage during transportation.
Is a certificate of compliance required for GOST 9941 pipes?
Yes. The manufacturer is required to provide a certificate of compliance that includes test results confirming the pipes meet GOST 9941 requirements. Third-party inspection can also be arranged if specified in the purchase order.