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Seamless and Welded Austenitic Stainless Steel Tubing from China Factory – Top Suppliers for General Service
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
Q
What is ASTM A269/A269M and what is it used for?
ASTM A269/A269M is a standard specification covering seamless and welded austenitic stainless steel tubing intended for general corrosion-resisting and low- or high-temperature service. It is widely used in industries such as chemical processing, food and beverage, pharmaceutical, and instrumentation.
Q
What steel grades are available under ASTM A269?
Common grades include TP304, TP304L, TP316, TP316L, TP321, and TP347, among others. Each grade has specific chemical composition limits for elements such as carbon, chromium, nickel, and molybdenum as defined by ASTM A959.
Q
What is the difference between seamless and welded tubing under this standard?
Seamless tubing is produced by piercing or extrusion processes, resulting in no weld seam. Welded tubing is manufactured using automatic welding without filler metal, and the weld seam must undergo heat treatment to ensure uniform properties along the tube length.
Q
What testing and inspection requirements apply to ASTM A269 tubing?
Hydrostatic or nondestructive testing (NDT) is required unless specifically waived by the purchaser. For welded tubing, flattening, reverse bend, or flange tests may also be required. If specified, an intergranular corrosion test per ASTM A262 must be performed, and mill test reports must comply with the standard.
Q
What information should buyers provide when placing an order?
Buyers should specify the quantity (length and number of pieces), material grade (e.g., TP304, TP316), dimensions (OD and wall thickness), condition (annealed or cold-worked), required tests (hydrostatic or NDT), and any certification or special marking requirements.
Q
How is ASTM A269 tubing marked and certified?
Each tube must be clearly marked with the manufacturer's name or trademark, material grade, heat number, size, and the standard designation — either A269 for imperial units or A269M for metric units. Certification is provided through mill test reports that must fully comply with the standard's requirements.