Hot Products
- Carbon & Carbon Alloy Steel
- Stainless Steel
- Copper & Nickel Alloy
- Heat Efficiency Tubes
- Pipe Fittings
- Pipe Flanges
- Gasket, Stud Bolt &Nut
- Industrial Valves
0102030405
Seamless Hot-Deformed Stainless Steel Pipes for Industrial Uses - China Suppliers & Factory GOST 9940
Ordering Information
When ordering pipes according to GOST 9940, the following must be specified:
- Pipe dimensions (outer diameter, wall thickness, length)
- Steel grade (chemical composition)
- Mechanical property requirements (tensile strength, yield strength, elongation)
- Type of heat treatment (annealed, quenched, etc.)
- Non-destructive testing (NDT) requirements (ultrasonic, hydraulic, eddy current)
- Additional testing (intergranular corrosion resistance, flattening, flaring, etc.)
- Marking and packaging requirements
Steel Grades & Chemical Composition
The standard covers austenitic, ferritic, and martensitic stainless steels, including:
- Austenitic grades: 12Х18Н10Т (AISI 321), 08Х18Н10 (AISI 304), 10Х17Н13М2Т (AISI 316Ti), etc.
- Ferritic/martensitic grades: 12Х13 (AISI 410), 20Х13 (AISI 420), etc.
🔑 Key Requirements:
- Chemical composition must comply with GOST 5632 or equivalent international standards (e.g., ASTM, EN).
- Permissible deviations in alloying elements are specified.
Manufacturing & Heat Treatment
- Pipes are produced by hot deformation (piercing, rolling, or extrusion).
- Heat treatment (annealing, quenching, tempering) is mandatory unless otherwise agreed.
- Surface finish must be free from cracks, laps, and other defects affecting performance.
Mechanical Properties
- Tensile strength, yield strength, and elongation must meet standard values based on steel grade.
- Hardness requirements (for martensitic grades).
- Impact toughness (if specified).
Inspection & Testing Requirements
-
Non-destructive testing (NDT):
- Ultrasonic testing (for defect detection).
- Hydraulic pressure testing (optional, as per customer request).
- Eddy current testing (for surface defects).
-
Destructive testing (sampling-based):
- Flattening test (for ductility verification).
- Flaring test (for pipe ends).
- Intergranular corrosion test (for austenitic grades, per GOST 6032).
-
Dimensional inspection:
- Outer diameter, wall thickness, and length tolerances must comply with GOST 9940.
Marking & Packaging
Each pipe must be marked with:
- Manufacturer's name/trademark.
- Steel grade.
- Heat number.
- Pipe dimensions.
- Standard number (GOST 9940).
📦 Packaging: Pipes are bundled, crated, or wrapped to prevent damage during transport.
Certification & Compliance
Manufacturer must provide a certificate of conformity including:
- Chemical composition.
- Mechanical test results.
- Heat treatment details.
- NDT reports (if applicable).
✅ Conclusion
GOST 9940 ensures the quality of seamless hot-deformed stainless steel pipes through strict chemical, mechanical, and NDT requirements. Compliance with this standard guarantees suitability for high-pressure, high-temperature, and corrosive environments.
📩 Want to order the same? Contact us Now to send your request!
❓ Frequently Asked Questions (FAQ)
Q
What is GOST 9940 and what does it cover?
GOST 9940 is a Russian/CIS standard that governs the technical requirements for seamless hot-deformed stainless steel pipes. It covers dimensions, steel grades, chemical composition, mechanical properties, heat treatment, inspection, marking, and packaging requirements.
Q
Which steel grades are covered under GOST 9940?
GOST 9940 covers austenitic grades such as 12Х18Н10Т (AISI 321), 08Х18Н10 (AISI 304), and 10Х17Н13М2Т (AISI 316Ti), as well as ferritic and martensitic grades like 12Х13 (AISI 410) and 20Х13 (AISI 420).
Q
What non-destructive testing (NDT) methods are required by GOST 9940?
GOST 9940 specifies ultrasonic testing for internal defect detection, eddy current testing for surface defects, and optional hydraulic pressure testing upon customer request. These tests ensure the structural integrity and reliability of each pipe.
Q
Is heat treatment mandatory for pipes produced under GOST 9940?
Yes. Heat treatment — including annealing, quenching, or tempering — is mandatory for pipes produced under GOST 9940 unless otherwise agreed upon between the manufacturer and the customer. This ensures optimal mechanical properties and microstructure.
Q
What information must be included in the manufacturer's certificate of conformity?
The certificate of conformity must include the chemical composition of the steel, results of mechanical tests (tensile strength, yield strength, elongation), details of heat treatment performed, and NDT reports where applicable.
Q
What applications are GOST 9940 stainless steel pipes suitable for?
GOST 9940 seamless stainless steel pipes are suitable for demanding industrial applications including high-pressure systems, high-temperature environments, and corrosive media — such as chemical processing, oil & gas, power generation, and food industry pipelines.