Stainless Steel 347 Seamless Pipe Specifications

Sachiya Steel International carries seamless pipes that conform to ASTM A312/ASME SA312 TP347. The following table provides a list of the most important procurement specifications for these pipes.

Property Details
StandardASTM A312 / ASME SA312
Nominal Bore (Seamless)1/2 inch NB to 24 inch NB
Outer Diameter1/8 inch to 30 inch NB
Wall Thickness0.6 mm to 12.7 mm
ScheduleSCH 5S, 10S, 20, 30, 40, STD, 60, 80, XS, 120, 140, 160, XXS
LengthSingle Random, Double Random, Cut-to-Length
End TypePlain End, Bevelled End, Threaded End
FinishMill Finish, Bright Annealed, Polished (No.4, No.8 Mirror), Electropolished
FormsHot-Finished, Cold-Finished (Cold-Drawn)
ShapeRound (Primary), Square, Rectangular
Dimensional StandardASME B36.19M
General RequirementsASTM A999

Stainless Steel 347 Seamless Pipe Size Chart

SS 347 seamless pipes are available from 1/2″ NB to 24″ NB (seamless) and 6″ NB to 100″ NB (EFW), with wall thickness ranging from 0.6 mm to 12.7 mm, in schedules SCH 5S through SCH XXS.

Parameter Range
Nominal Pipe Size (NPS)1/2 inch to 24 inch (Seamless), up to 100 inch (EFW)
Outside Diameter (OD)21.3 mm to 609.6 mm (Seamless)
Schedules5S, 10S, 40S, 80S, 160S, XXS
Wall Thickness0.6 mm to 12.7 mm (Standard range)
Standard Lengths6-metre Single Random, 12-metre Double Random
FormsRound, Square, Rectangular, Hydraulic

Stainless Steel 347 Seamless Pipe Weight Chart

This SS 347 seamless pipe weight chart provides precise mass calculations based on standard wall thicknesses and diameters.

NPS OD (inch / mm) SCH 10S (kg/m) SCH 40S (kg/m) SCH 80S (kg/m)
1/2"0.840 / 21.30.81.271.62
1"1.315 / 33.42.092.53.24
2"2.375 / 60.33.935.447.48
4"4.500 / 114.38.6316.0722.32
8"8.625 / 219.120.0642.5564.64

Stainless Steel 347 Seamless Pipe Price

SS 347 seamless pipe prices start from approximately ₹250/kg (India market), while in the US and other countries, they range between $2.40 and over $5 per kilogram. Final pricing depends on outer diameter, wall thickness, schedule, length, quantity, surface finish, and whether it's TP347 or TP347H. Cold-drawn pipes carry a higher per-kilogram cost than hot-finished variants. Request a quote for current international market rates.

Chemical Composition of Stainless Steel 347 Seamless Pipes

SS 347 seamless pipes (UNS S34700) contain the following elements per ASTM A312 / ASME SA312. All values are in weight percentage.
Using Columbium to prevent intergranular corrosion, this grade contains 17-19% Chromium and 9-13% Nickel. It provides exceptional weldability and high-heat performance for the most demanding industrial and aerospace piping requirements.

CarbonC
0.08 max
ManganeseMn
2.00 max
PhosphorusP
0.045 max
SulfurS
0.030 max
SiliconSi
1.00 max
ChromiumCr
17.0-19.0
NickelNi
9.0-13.0
Columbium + TantalumNb+Ta
10xC min, 1.00 max
IronFe
Balance

Mechanical Properties of Stainless Steel 347 Seamless Pipes

ASTM A312 TP347 seamless pipe meets the following minimum mechanical requirements. These values apply to the solution-annealed condition.
SS 347 can handle temperatures up to 870°C and tensile strengths up to 515 MPa. Its high density and 35% elongation make it work well in areas with high pressure and great heat, such power boilers and aerospace exhausts.

75 / 515
ksi / MPa (min)
Tensile Strength
30 / 205
ksi / MPa (min)
Yield Strength
35%
(min)
Elongation
160/190
HB
Hardness
Property Value
Tensile Strength (min)515 MPa (75 ksi)
Yield Strength (min)205 MPa (30 ksi)
Elongation (min)35%
Hardness160-190 HB (Brinell)
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Equivalent Designations for Stainless Steel 347 Seamless Pipes

SS 347 seamless pipe carries multiple international designations. The table below cross-references each standard so procurement teams can match local specifications to the correct alloy.

Standard Designation
UNSUNS S34700
EN / DIN1.4550, X6CrNiNb18-10
JISSUS 347
GB/T06Cr18Ni11Nb, 0Cr18Ni11Nb
AFNORZ6CNNb18-10
BS347S17
GOST08Ch18N12B

Industrial Applications of Stainless Steel 347 Seamless Pipes

SS 347 seamless pipes serve major industrial sectors where intergranular corrosion resistance and high-temperature creep strength are non-negotiable: power generation, chemical and petrochemical processing, oil and gas, and aerospace.

Power Generation

SS 347 handles high-temperature boiler steam better and is essential for steam header systems.

Chemical and Petrochemical Processing

Reactor piping and distillation columns for hot organic acid processing.

Oil and Gas

Type 347 seamless pipe is used in refinery heating tubes, catalytic reformer pipework, and high-pressure hydrogen lines. It's cheaper than higher-nickel alloys and doesn't need post-weld annealing in most refineries due to creep strength above 500°C.

Aerospace

SS 347 is used in aerospace exhaust manifolds, engine piping, and turbochargers for high-temperature oxidation resistance.

Get the Best Price on SS 347 Seamless Pipes.

Stainless Steel 347 vs 304 Seamless Pipe Comparison

While 304 and 316 are industry standards for general and marine use, SS 347 is the technical choice for high-heat welded environments. Its niobium content ensures structural integrity where other austenitic grades would fail due to intergranular attack.

Feature Stainless Steel 347 Stainless Steel 304
Stabilizing ElementNiobium (Columbium)None
Service Temperature425 C to 815 CUp to 425 C (max)
Welding PropertyHigh resistance to sensitisationRisk of carbide precipitation
Creep StrengthSuperior at high temperaturesLower thermal stability
Best ApplicationExhaust manifolds, boilersGeneral purpose/decorative

Stainless Steel 347 vs 316 Seamless Pipe Comparison

Compared to SS 316, SS 347 is better at resisting intergranular corrosion when welded and has a greater creep strength above 500°C. SS 316 is more resistant to corrosion in general when it is in a chloride environment at room temperature.

Feature Stainless Steel 347 Stainless Steel 316
Alloying FocusThermal stability (Niobium)Corrosion resistance (Molybdenum)
Chloride ResistanceModerateExcellent (Pitting resistance)
High-Temp CreepHigher than 500 CLower than 347
EnvironmentOxidation/High heatMarine/Chemical processing
Cost FactorGenerally higherStandard premium

Shipping & Packaging

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

We strictly follow seaworthy export handling standards to protect SS 347 seamless 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 Sizes are Available for SS 347 Seamless Pipes? +
SS 347 seamless pipeline wall thickness spans SCH 5S to SCH XXS (0.6 mm to 12.7 mm). You can find sizes ranging from 1/2″ NB to 24″ NB. Options for lengths include single random, double random, and cut-to-length.
What is the Maximum Operating Temperature for SS 347 Seamless Pipes? +
SS 347 seamless pipe handles 815–870°C (1,500–1,600°F) continuously in oxidising atmospheres. Its Nb stabilisation maintains structural integrity and prevents carbide precipitation. This grade effectively resists sensitisation up to the stated heat limit.
What is the Difference Between SS 347 and SS 304 Seamless Pipes? +
SS 347 contains niobium (columbium), which prevents intergranular corrosion after welding. SS 304 lacks this stabiliser and is sensitive to sensitisation in the 425-815°C range. Choose 347 if the pipe will be subjected to heavy welding and elevated temperatures.
Is SS 347 Seamless Pipe Better Than SS 316 Pipe? +
SS 347 offers superior intergranular corrosion resistance in welded condition and higher creep strength above 500°C. SS 316 provides better chloride pitting resistance at ambient temperatures. It's the operating temperature and corrosive environment that determine the right choice.
What is the Price of SS 347 Seamless Pipes? +
In India, you’ll find prices starting at ₹250 per kilogram. Factors like outside diameter, wall thickness, schedule, volume, and finish dictate the price. Contact Sachiya Steel International for a current estimate.
What ASTM Specification Covers SS 347 Seamless Pipes? +
The primary specification is ASTM A312 / ASME SA312 for general service. ASTM A376 / ASME SA-376 applies to high-temperature central-station service. Dimensions follow ASME B36.19M.
Can SS 347 Seamless Pipes be Used for Exhaust Manifolds? +
Yes. SS 347's creep resistance and Nb stabilisation suit turbo exhaust manifold applications. The alloy handles continuous service up to 815°C and won't sensitise under thermal cycling.
What is the Difference Between SS 347 and SS 347H Seamless Pipes? +
SS 347H has a higher minimum carbon content (0.04–0.10%) compared to standard 347 (0.08% max). This gives 347H greater creep strength above 525°C. It's preferred for power plant superheater tubing and boiler applications. TP347H typically costs more due to tighter carbon control and additional testing requirements.

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