GB/T13296 Standard Specification for Seamless Stainless Steel Tubes for Boilers and Heat Exchangers

When ordering, the following should be specified:  

- Standard number (GB/T 13296)  

- Steel grade (e.g., 06Cr19Ni10, 022Cr17Ni12Mo2, etc.)  

- Dimensions (outer diameter, wall thickness, length)  

- Delivery condition (annealed, solution-treated, etc.)  

- Special requirements (e.g., non-destructive testing, hydrostatic pressure test)

The standard covers multiple austenitic, ferritic, and martensitic stainless steel grades, including:  

- Common grades:  

  - 06Cr19Ni10 (304)  

  - 022Cr19Ni10 (304L)  

  - 06Cr17Ni12Mo2 (316)  

  - 022Cr17Ni12Mo2 (316L)  

  - 06Cr18Ni11Ti (321)  

  - 06Cr25Ni20 (310S)  

- Chemical composition limits (C, Si, Mn, P, S, Cr, Ni, Mo, etc.) are specified for each grade.

- Tensile strength, yield strength, elongation requirements vary by steel grade and heat treatment condition.  

- Hardness limits may apply depending on the application.

- Tubes are manufactured by hot-rolling or cold-drawing followed by solution treatment or annealing.  

- Surface quality must be free from cracks, folds, and other defects.

- Hydrostatic test (or non-destructive testing like ultrasonic or eddy current) is required unless otherwise specified.  

- Flattening test, flaring test, or bending test may be required for certain applications.  

- Grain size assessment for austenitic steels (if specified).  

- Intergranular corrosion test (e.g., ASTM A262 Practice E or GB/T 4334 for acid-resistant applications).

- Each tube shall be marked with:  

  - Manufacturer’s name/trademark  

  - Steel grade  

  - Standard number (GB/T 13296)  

  - Heat number  

  - Dimensions  

- Packaging should prevent damage during transport (e.g., bundled with protective coatings).

The latest version may include updates on:  

- New steel grades (e.g., improved corrosion-resistant alloys).  

- Stricter inspection requirements (e.g., enhanced non-destructive testing).  

- Revised mechanical property limits for better performance.  

Conclusion  

GB/T 13296 ensures the quality of seamless stainless steel tubes for high-temperature and corrosive environments. Buyers should specify requirements clearly, and manufacturers must comply with chemical composition, mechanical properties, and testing standards.