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

 1. Scope  

This standard applies to seamless stainless steel tubes used in boilers, superheaters, heat exchangers, and condenser pipelines, including dimensions, technical requirements, inspection methods, and marking.

 2. Ordering Information  

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)  

 3. Steel Grades and Chemical Composition  

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.  

 4. Mechanical Properties  

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

- Hardness limits may apply depending on the application.  

 5. Manufacturing and Delivery Conditions  

- 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.  

 6. Inspection and Testing Requirements  

- 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).  

 7. Marking and Packaging  

- 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).  

 8. Comparison with Previous Versions  

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.  

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