Our high-quality stainless steel seamless pipes are manufactured via advanced hot-extrusion, cold-drawn, or cold-rolled processes, offering weldless construction, dense microstructure, excellent corrosion resistance, and high pressure-bearing capacity. Widely used in oil & gas, chemical processing, power generation, pharmaceuticals, food & beverage, offshore engineering, and high-end manufacturing, these pipes meet the most stringent requirements for material purity, structural integrity, and corrosion resistance. With superior oxidation resistance, high-temperature strength, and low-temperature toughness, they are the reliable solution for critical applications under extreme conditions.
Key Features
Standards:
International:
ASTM A312 (Seamless austenitic stainless steel pipe)
ASTM A213 (Seamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes)
ASTM A269 (Seamless and welded austenitic stainless steel tubing)
ASTM A789/A790 (General-purpose seamless/ferritic-austenitic stainless steel pipe)
ISO 1127 (Stainless steel seamless tubes-dimensions, tolerances, mass)
EN 10216-5 (Seamless steel tubes for pressure purposes-Part 5: Stainless steels)
Chinese:
GB/T 14976 (Seamless stainless steel pipes for fluid transport)
GB/T 13296 (Seamless stainless steel tubes for boiler and heat exchangers)
Specialty Standards:
NACE MR0175 / ISO 15156 (Sour service compliance)
PED 2010/35/EU (CE Marking for pressure equipment)
Materials:
Austenitic Stainless Steels:
304/304L, 316/316L (Mo-enhanced, chloride resistance)
321 (Ti-stabilized), 347 (Nb-stabilized, high-temp stability)
Duplex Stainless Steels:
2205 (S32205): High strength, excellent chloride SCC resistance
2507 (S32750): Super duplex for severe environments
Special Alloys:
904L, 6Mo (S31254), 800H (N08810), etc., for extreme service
Dimensions:
OD: 6 mm –1000 mm
WT: 0.5 mm – 100 mm
Length: Fixed (6m, 12m), up to 30m
Tolerances (ASTM A312 / GB/T 14976):
OD: ±0.75% or ±0.1mm (precision)
WT: +12.5% / -10% (up to ±8% for cold-drawn)
Surface Finish:
Hot-finished (Pickled, No.1)
Cold-drawn (Bright Annealed, BA)
Mechanically Polished (Ra ≤ 0.8μm, for pharma/food)
Applications:
Oil & Gas: Refinery, ethylene, hydroprocessing units
LNG: Cryogenic transfer lines (-196°C)
Power: Supercritical boiler superheaters
Pharma/Food: Sterile fluid systems (GMP compliant)
Offshore: Seawater cooling, desalination plants
Water Treatment: RO, EDI systems
Aerospace/Semiconductor: High-purity hydraulic/processing lines
Certifications:
Classification Society Approvals:
CCS, ABS, DNV, BV, LR, NK material & factory approval
MTC (Type 3.1/3.2) with class stamp, third-party inspection supported
End-User & Engineering Company Qualifications:
Owners: CNPC, CNOOC, Sinopec, Shell, BP, TotalEnergies, ADNOC, Saudi Aramco,Sabic,BHEL,EIL,Sasol,Petrobras,KOC,KNPC,PDO,JGC,
EPCs: Fluor, Bechtel, TechnipFMC, Saipem, Linde, Worley, SEG, COOEC
Global Projects: Supplied to refineries, LNG plants, offshore platforms in Middle East, Asia, Africa.
Quality & System Certifications:
ISO 9001:2015, ISO 14001:2015, ISO 45001:2018
PED 2010/35/EU (CE Mark)
NACE MR0175 / ISO 15156
AD2000-W0
Full traceability from billet heat number to final inspection
Common Customer Questions (Q&A Format)
Q: Are your stainless steel pipes seamless? What are the advantages over welded?
A: Yes, they are hot-extruded or cold-drawn seamless pipes. Seamless pipes have no weld defects, higher pressure rating, uniform corrosion resistance, and better integrity for critical services.
Q: Do you comply with ASTM A312 or GB/T 14976? Can you provide MTC?
A: Yes, fully compliant. We provide Mill Test Certificates (MTC Type 3.1/3.2) with full chemical, mechanical, intergranular corrosion, and NDT data.
Q: Can you supply 316L or 2205 duplex steel? Resistant to chloride stress corrosion?
A: Yes. 2205 duplex offers excellent resistance to chloride-induced stress corrosion cracking (SCC), ideal for offshore and chemical environments.
Q: What is your minimum wall thickness? Suitable for instrumentation tubing?
A: As thin as 0.5mm (OD ≥6mm), suitable for instrumentation, capillary, and hydraulic systems with high dimensional accuracy.
Q: Are you approved by International Oil, EPC company ?
A: Yes. We are technically qualified by Sabic,BHEL,EIL,Sasol,Petrobras,KOC,KNPC,PDO,JGC,Shell, Saudi Aramco, ADNOC, and TotalEnergies for long-term supply.
Q: What is the lead time? Do you have stock for common sizes?
A: Lead time: 45–60 days. Common sizes (e.g., 316L 1" Sch 10S) are in stock for urgent projects.
Q: Do you provide NDT reports (ET, UT, hydrotest)?
A: Yes. We provide ET, UT, hydrostatic, and pneumatic test reports to ensure defect-free integrity.
Q: Can you manufacture per customer MDS or drawing?
A: Yes. Custom production available per MDS, technical spec, or drawing, including special tolerances, surface finish, heat treatment, and passivation.
Q: Suitable for cryogenic LNG service? Can you provide -196°C impact data?
A: Yes. 304L/316L are suitable for LNG. We provide Charpy V-notch impact tests at -196°C to verify low-temperature toughness.
Q: What is your export packaging? Suitable for long-term storage?
A: Vacuum-sealed plastic bags + rust preventive oil + wooden crates + desiccants, with end caps-ensures protection during sea freight and long-term storage.
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