Ninthore Overseas is one of the Leading Manufacturer And Exporter of high quality Stainless Steel 310H Washers, which is an authenticate stainless steel developed for use in high temperature corrosion resistant applications. SS 310H Flat Washers resists oxidation up to 2010 Degree F (1100 Degree C) under mildly cyclic conditions. Because of its high chromium and moderate nickel content, SS 310H Lock Washers is resistant to suffixation and can also be used in moderately carburizing atmospheres. The more severe carburizing atmospheres of thermal process equipment usually require nickel alloys such as SS 310H Sealing Washers.

When heated between 1202 Degree F – 1742 Degree F (650 Degree C – 950 Degree C), Stainless Steel 310H Split Washers is subject to sigma phase precipitation. Stainless Steel 310H Slot Washers can be utilized in slightly oxidizing, nitriding, cementing and thermal cycling applications, albeit, the maximum service temperature must be reduced. Stainless Steel 310H Machine Washers also finds usage in cryogenic applications with low magnetic permeability and toughness down to -450 Degree F (-268 Degree C).

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A solution annealing treatment of SS 310H Star Washers at 2012 Degree F – 2102 Degree F (1100 Degree C – 1150 Degree C) will restore a degree of toughness. Due to high resistivity and strength these Stainless Steel 310H Spring Washers are highly useful in various industries and applications like Chemical processing plants, automobile, mechanical parts factories are the firms that insist for such fittings on a daily basis.

SS 310H Washer Specifications
Specifications : ASTM A 479 ASME SA 479
Standard : DIN, ASTM, BS and all International Standards
Length : M02 to M33
Size : 3 mm to 200 mm
Type : Flat Washer, Lock Washer, Sealing Washer, Split Washer, Slot Washer, Machine Washer, Star Washer SPRINGS – Wire Spring & Flat Spring

310H Stainless Steel Washers Chemical Composition

Grade C Mn Si P S Cr Mo Ni N
SS 310H 0.04 – 0.10 2 max 1.00 max 0.045 max 0.030 max 24.00 – 26.00 19.00 – 21.00 53.885 min

Stainless Steel 310H Washer Mechanical Properties

Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
7.9 g/cm3 1402 °C (2555 °F) Psi – 75000 , MPa – 515 Psi – 30000 , MPa – 205 40%

Equivalent Grades for 310H Stainless Steel Washer

SS 310H S31009

SS 310H Washers 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

310H Steel Washers 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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