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Seamless Stainless Steel Tubes for Boilers & Heat Exchangers - China Suppliers & Factory Standards GB/T13296
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)
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.
Mechanical Properties
- Tensile strength, yield strength, elongation requirements vary by steel grade and heat treatment condition.
- Hardness limits may apply depending on the application.
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.
Inspection & 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).
Marking and Packaging
Each tube shall be marked with:
-
Required markings:
- 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).
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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Frequently Asked Questions (FAQ)
Q
What is GB/T 13296 and what does it cover?
GB/T 13296 is a Chinese national standard that specifies the requirements for seamless stainless steel tubes used in boilers and heat exchangers. It covers chemical composition, mechanical properties, manufacturing conditions, inspection methods, marking, and packaging for various stainless steel grades.
Q
Which stainless steel grades are included in GB/T 13296?
The standard covers multiple grades including 06Cr19Ni10 (304), 022Cr19Ni10 (304L), 06Cr17Ni12Mo2 (316), 022Cr17Ni12Mo2 (316L), 06Cr18Ni11Ti (321), and 06Cr25Ni20 (310S), among others spanning austenitic, ferritic, and martensitic types.
Q
What testing is required under GB/T 13296?
Required testing typically includes hydrostatic testing or non-destructive testing (ultrasonic or eddy current), flattening, flaring, or bending tests for specific applications, grain size assessment for austenitic steels, and intergranular corrosion testing where applicable.
Q
How are GB/T 13296 tubes manufactured?
Tubes complying with GB/T 13296 are produced by hot-rolling or cold-drawing processes, followed by solution treatment or annealing. The finished tubes must be free from surface defects such as cracks, folds, or seams.
Q
What information should I provide when placing an order?
When ordering, you should specify the standard number (GB/T 13296), the required steel grade, dimensions (outer diameter, wall thickness, and length), delivery condition (annealed or solution-treated), and any special requirements such as non-destructive testing or hydrostatic pressure testing.
Q
How does GB/T 13296 compare to ASTM standards for stainless steel tubes?
GB/T 13296 is the Chinese equivalent to standards such as ASTM A213 for seamless ferritic and austenitic alloy-steel boiler tubes. While both cover similar grades and testing requirements, there are differences in specific chemical composition limits, mechanical property values, and testing procedures. Buyers should verify compatibility when substituting one standard for another.