ASTM A312 / ASME SA-312 Stainless Steel Welded Pipe Specifications

These specifications describe the sizes, wall thickness schedules, manufacturing methods and standards for ASTM A312 TP347 welded pipe, intended for high-temperature service and resistance to intergranular corrosion in demanding industrial applications.

Specification Details
Standard ASTM A312 / ASME SA-312, ASTM A358 / ASME SA-358
Pipe Size (NB) 1/2” to 24” NB (ERW/Welded); 6” to 100” NB (EFW per ASTM A358)
OD Range A312: up to 24” NB (610 mm OD)
A358/A409: larger diameters up to ~100” NB
Wall Thickness 1 mm to 30 mm
Schedules SCH 5S, 10S, 40S, 80S, STD, XS, SCH 60, 80, 120, 140, 160, XXS
Length Single Random (5–7 m), Double Random (10–12 m), Cut Length
End Finish Plain End, Bevelled End, Threaded End
Forms Round, ASTM A554 (Square, Rectangular)
Manufacturing Method ERW, EFW (ASTM A358)
Dimensions Standard ASME B36.19

Stainless Steel 347 Welded Pipe Sizes & Dimensions

The table below shows the usual sizes and dimensions of Stainless Steel 347 welded pipes used in high-temperature and corrosion-resistant applications.

Parameter Specification
Outer Diameter (OD) 6.00 mm to 1219.2 mm
Wall Thickness 0.5 mm to 25.0 mm
NPS Size Range 1/8" to 48" NB
Pipe Schedules SCH 5 to XXS
Length Single Random, Double Random, Cut-to-Size (as required)

Stainless Steel 347 Welded Pipe Price

Stainless Steel 347 welded pipe prices range from ₹250 to ₹400 per kilogram in India and approximately $2.00 and $5.00 USD per kg. Many factors influence the final price, including pipe outside diameter, wall thickness, schedule, length ordered, quantity, surface finish, specification (A312 or A358), and current nickel and chromium prices. Individual piece prices range from US $1 to $80, depending on size. Contact Sachiya Steel International for accurate quotes tailored to your project.

Chemical Composition of Stainless Steel 347 Welded Pipe

The chemical composition of ASTM A312 TP347 welded pipe creates a stable structure that resists intergranular corrosion, performs well at high temperatures, and works reliably in tough industrial conditions.

Carbon C
Max 0.08%
Manganese Mn
Max 2.00%
Phosphorus P
Max 0.045%
Sulfur S
Max 0.030%
Silicon Si
Max 1.00%
Chromium Cr
17.0 – 19.0%
Nickel Ni
9.0 – 13.0%
Niobium + Tantalum Nb+Ta
10×C min, 1.00% max

Mechanical Properties of Stainless Steel 347 Welded Pipe

The table below shows the mechanical properties of ASTM A312 TP347 welded pipe, including its strength and ductility for reliable use at high temperatures and pressures.

75 / 515
MPa (ksi)
Tensile Strength
30 / 205
MPa (ksi)
Yield Strength
35%
(min)
Elongation
Parameter Specification
Tensile Strength (min) 75 (515) ksi (MPa)
Yield Strength, 0.2% Offset (min) 30 (205) ksi (MPa)
Elongation (min) 35 %
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Equivalent Designations of Stainless Steel 347 Welded Pipe

SS 347 welded pipe is recognised under multiple international standards. The table below maps equivalent designations across many regions.

Parameter Specification
UNS S34700
Japan (JIS) SUS 347
China (GB/T) 06Cr18Ni11Nb
France (AFNOR) Z6CNNb18-10
South Korea (KS) STS 347
India (IS) IS 6911 347

Industrial Applications of Stainless Steel 347 Welded Pipe

SS 347 welded pipe is mainly used in four industries where high heat and corrosion resistance are important: petroleum refining, power generation, chemical processing and heat exchanger manufacturing.

Petroleum Refining and Petrochemical Industry

Refineries use 347 stainless steel welded pipe in catalytic reformer units, crude distillation columns and transfer lines operating at high temperatures.

Power Generation

Boiler tube headers, superheater connections, and main steam piping in thermal power plants rely on ASTM A312 TP347 welded pipe.

Chemical Processing

Alloy 347 welded pipe handles oxidising and moderately reducing chemical environments. Reactors, condensers and piping systems in fertiliser plants, pharmaceutical facilities and acid-handling operations are common installations.

Heat Exchanger Systems

Shell-and-tube heat exchangers use Type 347 welded pipe for tube-to-tubesheet joints.

Shipping & Packaging

Main export packaging setup Heavy-duty wooden boxes Packing
Export Packaging Standard

We strictly follow seaworthy export handling standards to protect 347 welded pipe from transit damage, moisture ingress, and surface contamination during long-distance dispatch.

  • Heavy-duty wooden boxes with moisture barrier lining
  • HDPE stretch film wrapping on all bundles
  • Plastic end caps on threaded and plain-end pipes
  • Silica gel desiccants to minimize moisture exposure
  • ISPM-15 fumigated wooden packaging for export
shipping preparation Pipe Bundle Yard Staging
Shipping packaging Container End-Cap Protection
Shipping stock Wrapped Export-Ready Bundles

We Export Worldwide

Sachiya Steel International supplies stainless steel products to major industrial markets across North America, Europe, the Middle East, Asia and Africa with export-ready documentation and logistics support.

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Frequently Asked Questions:

What is SS 347 Welded Pipe used for? +
SS 347 welded pipe is used in petroleum refining, power generation, chemical processing, and heat exchanger systems. Niobium stabilisation prevents intergranular corrosion between 800 and 1500°F, ideal for welded equipment.
What Sizes are available for Stainless Steel 347 Welded Pipe? +
Sachiya Steel supplies SS 347 welded pipes, ranging from 1/2” NB to 24” NB, or 21.3 to 610 mm OD. We offer wall thicknesses from 1 to 30 mm, and schedules 5S to XXS, available in both standard and custom cut lengths.
What is the difference between SS 347 and SS 321 Welded Pipe? +
SS 347 uses niobium stabilisation; SS 321 uses titanium. SS 347 gives better aqueous corrosion resistance and usually avoids post-weld annealing. SS 321 suits continuous temperatures above 1000°F.
What ASTM specification covers 347 Stainless Steel Welded Pipe? +
ASTM A312 or ASME SA-312 covers seamless and welded TP347 pipe. ASTM A358 or ASME SA-358 covers electric fusion-welded pipe. ASTM A409 covers larger diameter welded pipe.
Is SS 347 Welded Pipe suitable for high-temperature service? +
SS 347 welded pipe resists creep and carbide precipitation between 800 and 1500°F. Niobium stabilisation prevents sensitisation in the heat-affected zone, suiting refinery and power plant piping.

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