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GOST9940-81

GOST 9940-81 is a Russian national standard that specifies the requirements for seamless stainless steel pipes intended for use in various applications, including industrial, chemical, and mechanical sectors. This standard outlines the technical conditions, dimensions, tolerances, and quality specifications for the production of these pipes.

Key Features of GOST 9940-81:

1. Scope:
   • This standard applies to seamless pipes made from stainless steel grades suitable for various purposes, including high-pressure and high-temperature applications.
2. Materials:
   • The standard covers various grades of stainless steel, such as austenitic, martensitic, and ferritic steels. These grades are selected based on their corrosion resistance, strength, and temperature tolerance.
3. Dimensions and Tolerances:
   • The standard specifies the outer diameter, wall thickness, and length of the pipes. It includes permissible deviations and tolerances for these dimensions to ensure uniformity and compatibility in their applications.
4. Mechanical Properties:
   • GOST 9940-81 defines the required mechanical properties of the pipes, including tensile strength, yield strength, elongation, and hardness. These properties ensure that the pipes can withstand the mechanical stresses encountered in their intended applications.
5. Chemical Composition:
   • The standard outlines the acceptable chemical composition for the different grades of stainless steel. This includes the percentages of elements such as carbon, chromium, nickel, molybdenum, and others, which contribute to the steel's properties.
6. Testing and Inspection:
   • The standard specifies the types of tests that must be performed to verify the quality and conformity of the pipes. These tests may include tensile tests, hardness tests, hydrostatic tests, and non-destructive testing methods like ultrasonic testing.
7. Marking and Certification:
   • GOST 9940-81 requires proper marking of the pipes, including information such as the manufacturer's name, steel grade, dimensions, and batch number. Certification ensures that the pipes meet the specified requirements and have passed the necessary inspections.

Applications:

• Seamless stainless steel pipes produced according to GOST 9940-81 are widely used in industries such as chemical processing, petrochemical, oil and gas, power generation, and food processing due to their excellent corrosion resistance and mechanical properties.

In summary, GOST 9940-81 provides comprehensive guidelines for the production and quality control of seamless stainless steel pipes, ensuring their suitability for various demanding applications.