Our high-quality SS welded pipe are manufactured from premium stainless steel strips or plates using High-Frequency Welding (HFW) or TIG / GTAW welding, followed by solution annealing and pickling / polishing to ensure consistent mechanical properties between weld and base metal, excellent surface finish, and superior corrosion resistance. Featuring excellent corrosion resistance, good mechanical strength, high dimensional accuracy, stable weld quality, and cost advantage over seamless pipes, these pipes are widely used in oil & gas, chemical, pharmaceutical, food & beverage, power, offshore, water treatment, and high-end architectural applications.
Compared to seamless pipes, welded stainless pipes offer better cost efficiency and delivery flexibility for large-diameter, thin-wall, and long-length applications, making them an essential solution in modern industrial systems.
Key Features
Standards:
International:
ASTM A312: Seamless, welded, and heavily cold-worked austenitic stainless steel pipes;
ASTM A789/A790: Ferritic and austenitic stainless mechanical tubes;
ASME SA312: For pressure applications;
ISO 1127: Dimensions, tolerances, and technical delivery conditions;
European:
EN 10217-7: Welded stainless steel tubes for pressure purposes;
EN 10297-2: Mechanical use;
Chinese:
GB/T 12771: Welded stainless steel pipes for fluid transport;
GB/T 19228.2: For press-fitting plumbing systems;
Custom: Available per MDS, SPEC, ASME B31.3/B31.1.
Materials:
Austenitic: 304/304L, 316/316L (Mo-enhanced), 316Ti, 321 (Ti-stabilized), 347 (Nb-stabilized);
Duplex: 2205 (S32205), 2507 (S32750);
Ferritic/Martensitic: 430, 410;
Raw materials from TISCO, Baowu, Tsingshan, or international suppliers (Outokumpu, Acerinox).
Dimensions:
OD: 10 mm – 3000 mm (1/4" – 118")
WT: 0.5 mm – 80 mm
Length: 6m, 12m, up to 13.5m
Tolerances: Per ASTM A312 / GB/T 12771
Surface Finish: 2B, BA, No.4, 8K, Pickled
Applications:
Oil & Gas, Chemical, Pharma, Food & Beverage, Power, Desalination, Offshore, Architecture, Semiconductor.
Certifications:
Classification Societies: CCS, ABS, DNV, BV, LR;
End Users: Shell, BASF, Pfizer, CNOOC, etc.;
EPCs: Fluor, TechnipFMC, Worley, SEI;
System Certs: ISO 9001, ISO 14001, PED, FDA, GMP compatibility;
Traceability: Full test reports including chemistry, tensile, impact, intergranular corrosion (ASTM A262), RT/UT.
Common Customer Questions (Q&A Format)
Q: What welding process do you use? Is solution annealing performed?
A: TIG for small OD (≤89mm), HFW/TIG for large. All pipes are solution annealed.
Q: Do you comply with ASTM A312? Suitable for pressure systems?
A: Yes, compliant with ASTM A312, suitable for ASME B31.3/B31.1 pressure piping.
Q: Can you supply 316L, 2205? Do you perform intergranular corrosion tests?
A: Yes. We provide ASTM A262 testing (e.g., Practice E) with reports.
Q: Is it FDA-compliant? Suitable for food & beverage?
A: Yes, meets FDA 21 CFR, with electropolished (EP) interior for hygienic applications.
Q: Suitable for pharmaceutical use? Can you supply GMP-compliant tubing?
A: Yes, Ra ≤ 0.4μm EP finish, compliant with ASME BPE, for pharma/biotech.
Q: Do you have class approvals? Suitable for offshore platforms?
A: Yes, approved by CCS, ABS, DNV, used in offshore instrumentation and cooling systems.
Q: What is the lead time? Do you have stock?
A: 30–60 days. Common sizes (304/316L DN15–DN500) partially in stock.
Q: Do you provide NDT reports (RT/UT)?
A: Yes, all welds inspected by RT or UT.
Q: Can you provide custom fabrication (bends, reducers, flanged pipes)?
A: Yes, we offer prefabricated pipe spools per drawings.
Q: What is your export packaging?
A: Plastic wrap + wooden/steel crates + end caps, with optional rust preventive oil.
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