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China Suppliers of ASTM A269/A269M Austenitic Stainless Steel Tubing - Seamless & Welded Factory Direct
Ordering Information
Buyers should include:
- Quantity (length, number of pieces)
- Material grade (e.g., TP304, TP316)
- Dimensions (OD, wall thickness)
- Condition (annealed, cold-worked)
- Test requirements (hydrostatic, nondestructive testing)
- Certification or special marking needs
Steel Grades & Chemical Composition
Common austenitic grades include:
- TP304, TP304L, TP316, TP316L, TP321, TP347, etc.
- Composition limits for carbon, chromium, nickel, molybdenum, and other elements are specified per ASTM A959.
Mechanical Properties
- Tensile strength, yield strength, elongation requirements vary by grade and condition (annealed / cold-worked).
- Hardness limits may apply.
Manufacturing & Process Requirements
- Seamless tubing: Produced by piercing / extrusion.
- Welded tubing: Made via automatic welding without filler metal; weld seams must be heat-treated.
Inspection & Testing
- Hydrostatic or nondestructive testing (NDT): Required unless waived.
- Flattening, reverse bend, or flange tests: For welded tubing.
- Intergranular corrosion test (if specified): Per ASTM A262.
- Certification: Mill test reports must comply with the standard.
Surface Finish & Defects
- Tubing must be free of scale, cracks, and imperfections detectable by visual inspection.
- Minor imperfections removable within wall thickness limits are permitted.
Certification & Marking
Each tube must be marked with: manufacturer's name, grade, heat number, size, and standard designation (A269 or A269M for metric).
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Frequently Asked Questions
What is ASTM A269 / A269M used for?
ASTM A269 / A269M covers seamless and welded austenitic stainless steel tubing intended for general service applications, including instrumentation, heat exchangers, and fluid handling systems where corrosion resistance is required.
What steel grades are available under ASTM A269?
Common grades include TP304, TP304L, TP316, TP316L, TP321, and TP347. Each grade has specific chemical composition limits for elements such as carbon, chromium, nickel, and molybdenum as defined by ASTM A959.
What is the difference between seamless and welded tubing under this standard?
Seamless tubing is manufactured by piercing or extrusion, resulting in no weld seam. Welded tubing is produced by automatic welding without filler metal, and the weld seams must be heat-treated to restore corrosion resistance and mechanical properties.
What testing is required for ASTM A269 tubing?
Standard requirements include hydrostatic or nondestructive testing (NDT). For welded tubing, flattening, reverse bend, or flange tests may be required. An intergranular corrosion test per ASTM A262 can also be specified by the buyer.
What information should I provide when placing an order?
Buyers should specify quantity (length and number of pieces), material grade (e.g., TP304, TP316), dimensions (OD and wall thickness), condition (annealed or cold-worked), required test methods, and any special certification or marking requirements.
What marking is required on each ASTM A269 tube?
Each tube must be clearly marked with the manufacturer's name or trademark, material grade, heat number, size, and the standard designation — A269 for inch-pound units or A269M for metric units.