Ninthore Overseas is one of The Leading Manufacturer And Exporter Of High Quality Stainless Steel 310 Tubes, which is one of the most common man-made materials in the world, with tons of it produced annually. Qualities of Stainless Steel 310 Seamless Tubes include such things as the hardness, quenching behavior, need for annealing, tempering behavior, yield strength, and tensile strength of the resulting steel. The increase in the strength Stainless Steel 310S Welded Tubes as compared to pure iron is only possible by reducing iron’s ductility.

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Stainless Steel 310 Tubes

Stainless Steel 310 Tubes

Stainless Steel 310 ERW Tubes is often produced in bloomery furnaces for thousands of years, but its large – scale, industrial use only began after more efficient production methods were devised, with the production of blister steel and then crucible steel. This was followed by the Siemens – Martin process and then the Gilchrist – Thomas process that refined the quality of Stainless Steel 310S EFW Tubes. With their introductions, Stainless Steel 310 Round Tubes steel replaced wrought iron.

Further refinements in the process of Stainless Steel 310S Square Tubes, such as basic oxygen steelmaking (BOS), largely replaced earlier methods by further lowering the cost of production and increasing the quality of the product. Stainless Steel 310 Rectangular Tubes is generally identified by various grades defined by assorted standards organizations. The carbon content of Stainless Steel 310S Electropolish Tubes is between 0.002 % and 2.1 % by weight for plain iron – carbon alloys.

SS 310/310S Welded Tubes Specifications
Specifications : ASTM A/ASME SA213/A249/A269
Dimensions : ASTM, ASME and API
SS 310/310S Tubes Size
: 1/8″NB TO 30″NB IN
Thickness : 0.35mm to 6.35mm OD in thickness ranging from 0.1mm to 1.2mm.
Schedule : SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS
Type : Seamless / ERW / Welded / Fabricated / LSAW Tubes
Form : Round, Square, Rectangular, Hydraulic Etc
Length : Single Random, Double Random & Cut Length.
End : Plain End, Beveled End, Treaded
310/310S Stainless Steel Tubes Available Sizes
NB Sizes Sch 5 Sch 10 Sch 40 Sch 80 Sch 160
1 1/4″
1 1/2″
2 1/2″
310/310S Stainless Steel Tube Chemical Composition
Grade C Mn Si P S Cr Mo Ni N
310 min.  24.0 0.10  19.0
max.  0.015 2.0 0.15 0.020 0.015  26.0  21.0
310S min. 24.0 0.75 19.0
max. 0.08 2.0 1.00 0.045 0.030 26.0 22.0
Stainless Steel 310/310S Tubes 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
310 515 205 40 95 217
310S 515 205 40 95 217
Stainless Steel 310/310S Tube 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
310 7750 200 15.9 16.2 17.0 14.2 18.7 500 720
310S 7750 200 15.9 16.2 17.0 14.2 18.7 500 720
Equivalent Grades for 310/310S Stainless Steel Tubes
Grade UNS No Old British Euronorm Swedish SS Japanese JIS GOST
BS En No Name
310 S31000 304S31 58E 1.4841 X5CrNi18-10 2332 SUS 310 20Ch25N20S2
310S S31008 304S31 58E 1.4845 X5CrNi18-10 2332 SUS 310S 20Ch23N18
SS 310/310S Seamless / Welded Tubes 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
SS 310/310S Steel Tube 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)



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