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Seamless Stainless Steel Tubes for Boilers & Heat Exchangers - China Suppliers & Factory Quality Standards
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:
- 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 requirements for seamless stainless steel tubes used in boilers and heat exchangers. It covers steel grades, chemical composition, mechanical properties, manufacturing conditions, inspection requirements, and marking/packaging rules.
Q Which steel grades are covered under GB/T 13296?
The standard covers a range of austenitic, ferritic, and martensitic stainless steel grades including 06Cr19Ni10 (304), 022Cr19Ni10 (304L), 06Cr17Ni12Mo2 (316), 022Cr17Ni12Mo2 (316L), 06Cr18Ni11Ti (321), and 06Cr25Ni20 (310S), among others.
Q What information must be specified when placing an order under GB/T 13296?
When ordering, buyers must specify the standard number (GB/T 13296), steel grade, dimensions (outer diameter, wall thickness, length), delivery condition (e.g., annealed or solution-treated), and any special requirements such as non-destructive testing or hydrostatic pressure testing.
Q What testing and inspection methods are required by GB/T 13296?
The standard requires hydrostatic testing or equivalent non-destructive testing (such as ultrasonic or eddy current testing). Additional tests such as flattening, flaring, or bending tests may be required based on the application. Grain size assessment and intergranular corrosion testing (e.g., GB/T 4334) may also be specified.
Q How are GB/T 13296 seamless stainless steel tubes manufactured?
Tubes are produced through hot-rolling or cold-drawing processes, followed by either solution treatment or annealing to achieve the required mechanical properties. The surface must be free from cracks, folds, and other defects to meet quality standards.
Q What marking requirements apply to tubes produced under GB/T 13296?
Each tube must be marked with the manufacturer's name or trademark, steel grade, standard number (GB/T 13296), heat number, and dimensions. Tubes must also be packaged in a manner that prevents damage during transportation, such as bundling with protective coatings.