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Austenitic Stainless Steel Pipes - Seamless, Welded, and Cold Worked | China Suppliers & Factory
Ordering Information
Buyers must specify:
- Quantity (length, number of pipes)
- Material (grade, UNS number)
- Manufacturing method (seamless, welded, or cold worked)
- Dimensions (NPS, schedule, or wall thickness)
- Heat treatment requirements
- Test requirements (hydrostatic, nondestructive testing)
- Certification and inspection needs
- Any additional requirements (e.g., special finishes)
Steel Grades and Chemical Composition
Common grades include:
- TP304/304L, TP316/316L, TP321, TP347, TP310S (full list in Table 1)
- UNS designations (e.g., S30400, S31603) and composition limits (Cr, Ni, C, Mo, etc.) are specified
Mechanical Properties
- Tensile strength, yield strength, and elongation requirements per grade (Table 2)
- Hardness limits may apply for certain grades
Manufacturing Methods
- Seamless: Produced by hot working or cold working
- Welded: Made by automatic welding without filler metal; weld seams must pass nondestructive testing
- Cold Worked: Heavy cold working for enhanced strength
Heat Treatment
- Solution annealing is mandatory for all grades (quenched in water or rapidly cooled)
- Specific temperatures and cooling methods vary by grade
Inspection and Testing
- Hydrostatic Testing: Required unless replaced by nondestructive testing (NDT)
- Nondestructive Testing: Eddy current, ultrasonic, or radiographic testing for welded pipes
- Chemical Analysis: Per heat/lot
- Mechanical Tests: Tensile, hardness, flattening, flare, or bend tests as applicable
Certification and Marking
Manufacturer must provide certification of compliance. Pipes must be marked with:
- Manufacturer's name / logo
- Grade (e.g., TP304)
- Heat number
- Size and schedule
- ASTM standard (A312/A312M)
Keywords
Austenitic stainless steel · Seamless pipe · Welded pipe · Corrosion resistant · High temperature service
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❓ Frequently Asked Questions (FAQ)
Q
What information must buyers provide when ordering ASTM A312/A312M stainless steel pipes?
Buyers must specify the quantity, material grade (UNS number), manufacturing method (seamless, welded, or cold worked), dimensions (NPS, schedule, or wall thickness), heat treatment requirements, test requirements, certification needs, and any additional special requirements such as surface finishes.
Q
What are the most common steel grades covered under ASTM A312/A312M?
The most commonly used grades include TP304, TP304L, TP316, TP316L, TP321, TP347, and TP310S. Each grade has a corresponding UNS designation (e.g., S30400 for TP304) and defined chemical composition limits for elements such as Cr, Ni, C, and Mo.
Q
What manufacturing methods are permitted under ASTM A312/A312M?
Three manufacturing methods are recognized: Seamless (produced by hot or cold working), Welded (made by automatic welding without filler metal, with weld seams verified by nondestructive testing), and Cold Worked (heavily cold-worked for enhanced mechanical strength).
Q
Is heat treatment mandatory for ASTM A312/A312M pipes?
Yes. Solution annealing is mandatory for all grades covered under ASTM A312/A312M. The pipes must be quenched in water or rapidly cooled after annealing. Specific temperatures and cooling methods may vary depending on the grade.
Q
What testing and inspection methods are required for ASTM A312/A312M pipes?
Required tests include hydrostatic testing (unless substituted by NDT), nondestructive testing (eddy current, ultrasonic, or radiographic for welded pipes), chemical analysis per heat/lot, and mechanical tests such as tensile, hardness, flattening, flare, or bend tests as applicable.
Q
What markings are required on ASTM A312/A312M certified pipes?
Each pipe must be clearly marked with the manufacturer's name or logo, steel grade (e.g., TP304), heat number, size and schedule, and the applicable ASTM standard designation (A312/A312M). The manufacturer must also provide a certification of compliance with the standard.