Technical Requirements for Austenitic Stainless Steel welded Pipes with Large Diameter Used for Petrochemical Equipment (HG 20537.4-92)
In order to ensure the quality assurance of austenitic stainless steel welded pipe with large diameter used for petrochemical equipment, the Peoples Republic of China issued HG 20537.4-92 Technical Requirements for Austenitic Stainless Steel Welded Pipe with Large Diameter Used for Petrochemical Equipment. This standard is applicable to austenitic stainless steel welded pipes with large diameter below DN500 (Φ500mm) for general equipment and DN600 (Φ600mm) for pressure piping used in petrochemical equipment. It is divided into 13 chapters and one appendix.
Chapter 1 General Requirements
This chapter stipulates some general requirements for the production of large diameter austenitic stainless steel welded pipes. It stipulates that the standard should apply to general equipment and pressure vessels. The actual design drawings, drawings and other technical documents should be followed. It also points out that unless otherwise specified, the products that meet the requirements of this standard should be produced, inspected and tested throughout the entire process.
Chapter 2 Technical Requirements
This chapter mainly describes the technical requirements for the production of large diameter welded pipes from austenitic stainless steel. This includes material selection, chemical composition, mechanical properties, pipe-making (including cutting and welding requirements), post-weld processing, heat treatment and non-destructive test requirements. Chapter 3 Option Requirements
This chapter mainly describes some optional requirements for the production of large diameter welded pipes from austenitic stainless steel, such as surface requirements and surface mechanical properties. The color of the surface can also be specified according to the users requirements.
Chapter 4 Inspection Requirements
This chapter describes the requirements for product inspection, including random inspection, before-delivery inspection and in-process inspection. It mainly describes the requirements for the inspection of functions, appearance, mechanical properties, weight and quantity, and the qualification criteria for each kind of inspection item.
Chapter 5 Marking and Delivery Requirements
This chapter describes the requirements for product marking and delivery requirements. Marking regulations mainly include standard certification, pipe top mark, special product number mark, logo mark, special criteria, etc. The delivery requirements mainly include the completion time, packaging transportation and environmental requirements of the products.
Chapter 6 Remarks
This chapter provides some additional information and suggestions, mainly including the analysis of chemical composition, problems in welding and heat treatment, etc.
Chapter 7 Test Methods
This chapter describes the test methods for the products under this standard, including non-destructive testing and destructive testing.
Chapter 8, 9, 10 and 11 are some specific appendixes, respectively about ultrasonic inspection, pickling, chemical composition and non-destructive test methods.
Chapter 12 and 13 are some general appendixes. The 12th is the analysis and explanation of the logo on the mark, and the 13th is the fracture diameter of austenitic stainless steel welded pipe with large diameter applied in petrochemical equipment.
In summary, the HG 20537.4-92 Technical Requirements for Austenitic Stainless Steel Welded Pipe with Large Diameter Used for Petrochemical Equipment contain all the related standards for the production of large diameter welded pipes in petrochemical equipment, covering chemical composition, mechanical properties, pipe making, post weld processing, heat treatment and non destructive testing, marking and delivery , inspection requirements, quality system and other required contents, making sure that the products have reliable quality assurance and excellent performance.
