Customized large-diameter thick-walled stainless steel pipe

When your industrial project demands superior strength, exceptional pressure resistance, and long-term durability in aggressive environments, customized large-diameter thick-walled stainless steel pipes are the solution. These pipes are specifically engineered for applications that standard schedule pipes simply cannot handle-where high internal pressures, extreme temperatures, or heavy mechanical loads are routine.

Our large diameter thick wall stainless steel pipes are manufactured in strict compliance with ASTM A312/ASME SA312, the globally recognized specification covering seamless, straight-seam welded, and heavily cold worked austenitic stainless steel pipe intended for high-temperature and general corrosive service. The standard dimensions follow ASME B36.19, and we can also produce pipes with custom dimensions outside standardized schedules while maintaining full compliance with all other specification requirements.

Whether you need seamless construction for maximum integrity or welded pipe for cost-efficient large diameters, our team delivers precision-engineered thick-walled piping solutions tailored to your exact project specifications.

Products Description

Parameter	Available Range / Options
Standard	ASTM A312, ASTM A358, ASTM A778, ASME SA312, JIS G3459, EN 10216-5, GB/T 14976
Grade	TP304, TP304L, TP316, TP316L, TP321, TP347, TP310S, 904L
Outer Diameter (OD)	Seamless: 6mm – 630mm (0.24″ – 24.8″) Welded: up to 2,031mm (80″)
Wall Thickness (WT)	0.5mm – 140mm (0.02″ – 5.5″). Thick walls from Sch 40S, Sch 80S, Sch 160S to XXS, or custom specification
Length	6m (standard), up to 24m, or custom cut
Surface Finish	Mill finish, pickled, polished (No.1/No.2B/No.4/No.8/BA), brushed
Technique	Seamless (hot rolled / cold drawn / extruded), Straight-seam welded (TIG/Plasma/Laser), Heavy cold worked
End Type	Plain ends, beveled ends, threaded

Our large diameter stainless steel pipe covers OD ranges from 500mm to 1000mm with wall thicknesses from 3mm to 50mm as customer required.

Mechanical Properties & Material Composition

All grades meet the stringent mechanical property requirements of ASTM A312. Below are the key performance parameters for the most commonly specified grades:

Grade	Yield Strength (min MPa)	Tensile Strength (min MPa)	Elongation (min %)	Key Alloy Elements
TP304	205	515	35%	18-20% Cr, 8-11% Ni
TP304L	170	485	35%	18-20% Cr, 8-12% Ni, Low C (≤0.035%)
TP316	205	515	35%	16-18% Cr, 10-14% Ni, 2-3% Mo
TP316L	170	485	35%	16-18% Cr, 10-14% Ni, 2-3% Mo, Low C
TP321	205	515	35%	17-19% Cr, 9-12% Ni + Ti stabilization
TP347	205	515	35%	17-19% Cr, 9-13% Ni + Nb stabilization
TP310S	205	515	35%	24-26% Cr, 19-22% Ni

Source: ASTM A312/ASME SA312 Technical Data Sheet.

Product Advantages

Superior Mechanical Strength & Pressure Bearing Capacity

Our thick-walled stainless steel pipes feature an optimized wall thickness-to-diameter ratio for exceptional load-bearing capacity and thermal fatigue resistance. Typical austenitic mechanical properties: tensile strength ≥515 MPa, yield strength ≥205 MPa, elongation ≥35%. Seamless variants withstand pressures up to 80 MPa and temperatures from -196°C to 550°C, suitable for main steam lines, superheaters, and refinery piping.

Exceptional Corrosion Resistance Across Harsh Media

Corrosion resistance comes from chromium forming a self-healing passive layer. Our 316L and duplex 2205/2507 large-diameter pipes provide outstanding pitting, crevice, and stress corrosion cracking resistance in chloride-rich environments-critical for offshore platforms, seawater injection, and chemical plants. For severe acidic conditions, 904L grade replaces titanium pipes with nearly 30% cost savings.

Custom Manufacturing Excellence - Seamless & Welded Options

Seamless thick-walled pipe: hot-pierced from solid billets, hot-rolled (1,100–1,250°C), and precision cold-drawn, ideal for high-pressure, high-temperature, no-weld-seam applications; sizes up to 24″ NPS. Welded large-diameter pipe: formed from certified HRAP/2B coil or plate using TIG, plasma, or submerged arc welding with full argon shielding, followed by full solution annealing (1,050–1,150°C) to restore toughness. Welded offers diameters up to 48″ and beyond, with 25% lower cost and faster delivery versus seamless.

Full-Path Quality Control & Complete Traceability

Comprehensive inspection: raw material spectro analysis → 100% dimensional and visual checks → mechanical testing (tensile, hardness, flattening, flaring) → 100% hydrostatic test or NDT (ET/UT/RT) → optional intergranular corrosion test → final surface inspection and protective packaging. All results are documented on mill test certificates and are fully traceable to the heat number. Third-party inspection (SGS, BV, TÜV) available on request.

Global Packaging & Export Logistics

Standard packaging: bundled wooden or steel frame crates with plastic cap protection at both ends, suitable for container shipping. Custom crating is available for oversized items. We serve clients across the USA, Canada, Saudi Arabia, Brazil, Southeast Asia, Europe, and the Middle East.