Ninthore Overseas is one of The Leading Manufacturer And Exporter Of High Quality Stainless Steel 347H Pipes, which is easily welded, but the welding procedure is different than that used with carbon steel. These Stainless Steel 347H Seamless Pipes has excellent properties at both extremes of the temperature scale, which can be used down to liquid nitrogen temperatures and some up to about 1800 Degree F. Stainless Steel 347H Welded Pipes can be recycled 100 %, which can be re-melted to make new stainless steel. The typical amount of recycled Stainless Steel 347H EFW Pipes that is used to make new stainless steel is between 65 % & 80 %.

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Stainless Steel 347H Pipes

Stainless Steel 347H Pipes

When Stainless Steel 347H ERW Pipes contains more than approximately 10 % Chromium it can be classified as a stainless steel. This is because Chromium in Stainless Steel 347H Round Pipes has a high affinity for Oxygen and forms a stable Oxide film on the surface of the steel, where this film is resistant to further chemical or physical change. Incorrect specification, fabrication or subsequent handling may cause Stainless Steel 347H Square Pipes to stain or discolour, impairing the overall look.

This brown discolouration in Stainless Steel 347H Rectangular Pipes is referred to as “tea staining” and has been identified predominantly on external applications in the overseas. These Stainless Steel 347H Electropolish Pipes can be controlled and does not affect the structural integrity or the longevity of the material.

SS 347H Seamless Pipes Specifications
Specifications : ASTM A 312 ASME SA 312 / ASTM A 358 ASME SA 358
Dimensions : ASTM, ASME and API
SS 347H Pipes : 1/2″ NB – 16″ NB
ERW 347H Pipes : 1/2″ NB – 24″ NB
EFW 347H Pipes : 6″ NB – 100″ NB
Size : 1/8″NB TO 30″NB IN
Specialized in : Large Diameter Size
Schedule : SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS
Type : Seamless / ERW / Welded / Fabricated / LSAW Pipes
Form : Round, Square, Rectangular, Hydraulic Etc
Length : Single Random, Double Random & Cut Length.
End : Plain End, Beveled End, Treaded
347H Stainless Steel Pipe Available Sizes
NB Sizes Sch 5 Sch 10 Sch 40 Sch 80 Sch 160
1 1/4″
1 1/2″
2 1/2″
347H Stainless Steel Pipes Chemical Composition
Grade C Mn Si P S Cr Mo Ni N
347H min. 0.04 17.0 3.00 9.0
max. 0.10 2.0 1.00 0.045 0.030 19.0 4.00 13.0
Stainless Steel 347H Pipe Mechanical Properties
Grade Tensile Strength (MPa) min Yield Strength 0.2% Proof (MPa) min Elongation (% in 50mm) min Hardness
Rockwell B (HR B) max Brinell (HB) max
347H 515 205 40 92 201
Stainless Steel 347H Pipes Physical Properties
Grade Density (kg/m3) Elastic Modulus (GPa) Mean Coefficient of Thermal Expansion (m/m/0C) Thermal Conductivity (W/m.K) Specific Heat 0-1000C (J/kg.K) Electrical Resistivity (n.m)
0-1000C 0-3150C 0-5380C at 1000C at 5000C
347H 8000 193 17.2 17.8 18.4 16.2 21.5 500 720
Equivalent Grades for 347H Stainless Steel Pipe
Grade UNS No Old British Euronorm Swedish SS Japanese JIS
BS En No Name
347H S34709 1.4961
SS 347H Seamless / Welded Pipes Application Industries
  • Off-Shore Oil Drilling Companies
  • Power Generation
  • Petrochemicals
  • Gas Processing
  • Specialty Chemicals
  • Pharmaceuticals
  • Pharmaceutical Equipment
  • Chemical Equipment
  • Sea Water Equipment
  • Heat Exchangers
  • Condensers
  • Pulp and Paper Industry
347H Steel Pipes Test Certificates

We at Ninthore Overseas provide Manufacturer TC (Test Certificate) in accordance to EN 10204/3.1B, Raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report. We also provide Standard certificates like EN 10204 3.1 and additional requirement like. NACE MR 01075. FERRIT CONTENT as per norms if requested by clients.

• EN 10204/3.1B,
• Raw Materials Certificate
• 100% Radiography Test Report
• Third Party Inspection Report, etc

Material Testing

We at Ninthore Overseas ensure that all our materials go through strict quality tests before dispatching them to our clients.

• Mechanical Testing Such as Tensile of Area
• Hardness Test
• Chemical Analysis – Spectro Analysis
• Positive Material Identification – PMI Testing
• Flattening Test
• Micro and Macro Test
• Pitting Resistance Test
• Flaring Test
• Intergranular Corrosion (IGC) Test


• Commercial Invoice which includes HS Code
• Packing List including net weight and gross weight, number of boxes, Marks and Numbers
• Certificate of Origin legalized/attested by Chamber of Commerce or Embassy
• Fumigation Certificates
• Raw Material Test Reports
• Material Traceability Records
• Quality Assurance Plan (QAP)
• Heat Treatment Charts
• Test Certificates certifying NACE MR0103, NACE MR0175
• Material Test Certificates (MTC) as per EN 10204 3.1 and EN 10204 3.2
• Guarantee Letter
• NABL approved Laboratory Test Reports
• Welding Procedure Specification/Procedure Qualification Record, WPS/PQR
• Form A for the purposes of the Generalized System of Preferences (GSP)