Table of Contents
- SS 310/310S/310H Washers Overview
- SS 310/310S/310H Washers Specifications
- SS 310 Series Technical Properties & Composition
- Grades Comparison: SS 310 vs. SS 310S vs. SS 310H
- Why Industries Prefer SS 310/310S/310H Washers
- Types of SS 310 Washers
- Key Technical Advantages
- Key Applications of SS 310/310S/310H Washers
- Quality Testing & Inspection
- Global Export Markets
- Frequently Asked Questions
- Contact Aurum Overseas
SS 310/310S/310H Washers Suppliers & Exporters
Aurum Overseas is a premier SS 310/310S/310H Washers Supplier and SS 310/310S/310H Washers Exporter, stocking high-temperature, 25Cr-20Ni austenitic stainless steel washers designed for extreme heat resistance and uniform bolt torque distribution.
Manufactured in full compliance with ASME B18.21.1, DIN 125, and ISO 7089 standards, these UNS S31000 / S31008 / S31009 Washers deliver exceptional resistance to cyclic oxidation, thermal fatigue, and carburizing gas atmospheres in continuous elevated heat applications up to 1150°C.
As a worldwide SS 310/310S/310H Washers Exporter, Aurum Overseas distributes fully certified and traceable bolting hardware across North America (USA, Canada, Mexico), Europe (Germany, UK, France, Italy, Netherlands, Norway), the Middle East (UAE, Saudi Arabia, Qatar, Kuwait, Oman), and Asia-Pacific (Singapore, Malaysia, Australia).
SS 310/310S/310H Washers Specifications
| Parameter | Technical Specification / Standard Range |
|---|---|
| Material Grades | Stainless Steel 310, 310S, 310H |
| UNS Designations | UNS S31000 / S31008 / S31009 Washers |
| Werkstoff Numbers | 1.4841 / 1.4845 |
| Manufacturing Standards | ASTM A240 / ASME SA240, ASTM A276, ASTM F844 |
| Dimensional Specifications | ASME B18.21.1, DIN 125 A/B, DIN 127 B, DIN 9021, ISO 7089 |
| Washer Types | Plain Flat, Heavy Duty Structural, Spring Lock, Belleville Washers, Tab Washers |
| Size Range | Imperial: #4 to 4" NB | Metric: M3 to M100 |
| Thickness Range | 0.5 mm to 12 mm (Custom gauges available on order) |
| Hardness Range | Annealed: HRB 95 max (217 HBW max) |
| Surface Finishes | Bright Annealed, Passivated, Pickled, Electro-polished, High-Temp Ceramic Coated |
| Certification | EN 10204 3.1 MTR, PMI Testing Report, Hardness Verification |
SS 310 Series Technical Properties & Composition
Chemical Composition of UNS S31000 Washers (%)
| Element | SS 310 (S31000) | SS 310S (S31008) | SS 310H (S31009) |
|---|---|---|---|
| Carbon (C) | 0.25 max | 0.08 max | 0.04 – 0.10 |
| Manganese (Mn) | 2.00 max | 2.00 max | 2.00 max |
| Silicon (Si) | 1.50 max | 1.50 max | 1.00 max |
| Phosphorus (P) | 0.045 max | 0.045 max | 0.045 max |
| Sulfur (S) | 0.030 max | 0.030 max | 0.030 max |
| Chromium (Cr) | 24.0 – 26.0 | 24.0 – 26.0 | 24.0 – 26.0 |
| Molybdenum (Mo) | — | — | — |
| Nickel (Ni) | 19.0 – 22.0 | 19.0 – 22.0 | 19.0 – 21.0 |
| Iron (Fe) | Balance | Balance | Balance |
Mechanical Properties of UNS S31000 Washers
| Property / Parameter | SS 310 | SS 310S | SS 310H |
|---|---|---|---|
| Tensile Strength (MPa) min | 515 | 515 | 515 |
| Yield Strength 0.2% Proof (MPa) min | 205 | 205 | 205 |
| Elongation (% in 50mm) min | 40 | 40 | 40 |
| Rockwell Hardness B (HR B) max | 95 | 95 | 95 |
| Brinell Hardness (HB) max | 217 | 217 | 217 |
| Density (g/cm³) | 7.9 | 7.9 | 7.9 |
| Melting Point | 1402°C (2555°F) | 1402°C (2555°F) | 1402°C (2555°F) |
Equivalent Grades of SS 310 / 310S / 310H Washers
| Standard / System | SS 310 | SS 310S | SS 310H |
|---|---|---|---|
| UNS Designation | S31000 | S31008 | S31009 |
| Werkstoff Nr. | 1.4841 | 1.4845 | 1.4845 |
| JIS Standard | SUS 310 | SUS 310S | — |
| BS Standard | 310S24 | 310S16 | — |
| GOST Standard | 20Ch25N20S2 | 20Ch23N18 | — |
| EN Standard | X15CrNi25-20 | X8CrNi25-21 | — |
Grades Comparison: SS 310 vs. SS 310S vs. SS 310H
| Feature | SS 310 | SS 310S | SS 310H |
|---|---|---|---|
| Carbon Content | High (0.25% max) | Low (0.08% max) | Controlled High (0.04% - 0.10%) |
| Max Service Temp. | Up to 1150°C continuous | Up to 1150°C (optimized thermal cycling) | Up to 1150°C (optimized creep rupture) |
| Weld Heat Zone | Susceptible to carbide precipitation | Resists intergranular corrosion | Optimized for sustained high stress |
| Grain Structure | Standard commercial | Fine grain toughness | Controlled coarse grain for creep resistance |
| Best Used For | Furnace hardware & kiln fixtures | Welded high-temp ducting & piping | Thermal power boilers & steam reformers |
Why Industries Prefer SS 310/310S/310H Washers
Prevents High-Temperature Oxidation: 25% chromium content forms a adherent protective oxide scale up to 1150°C.
Resists Carburization & Sulfidation: High nickel concentration (up to 22%) prevents carbon absorption in reducing gas streams.
Prevents Thermal Fatigue Cracking: Resists thermal shock during rapid furnace heating and cooling cycles.
Maintains Load Under Elevated Creep: High-carbon 310H variants prevent relaxation and sagging under sustained high-temperature tension.
Eliminates Weld Sensitization: Low-carbon 310S variants allow direct field welding without post-weld heat treatment.
Types of SS 310 Washers
Aurum Overseas supplies a comprehensive range of stainless steel washer configurations manufactured according to standard DIN, ASME, and ISO dimensional tolerances for multiple engineering assemblies.
SS 310 Plain Washers
SS 310 Spring Washers
SS 310 Lock Washers
SS 310 Square Washers
SS 310 Conical Washers
Key Technical Advantages
High Refractory Capability
Operates continuously above 1000°C where standard 304 and 316 grades suffer rapid scaling.
Austenitic Stability
Resists sigma phase embrittlement during prolonged exposure in the 650°C to 900°C temperature range.
Uniform Load Distribution
Cold-stamped precision ensures true flat seating to prevent stress concentration on ceramic or refractory mating surfaces.
Resistance to Cyanide Salts
Chemical composition resists attack in molten salt bath heat treatment processes.
Low Magnetic Permeability
Retains fully non-magnetic characteristics in elevated temperature environments.
Key Applications of SS 310/310S/310H Washers
| Industry Sector | Recommended Grade | Typical Equipment Application | Service Conditions |
|---|---|---|---|
| Furnace Manufacturing | SS 310 | Kiln anchor bolts, burner muffle mounts | Continuous dry heat up to 1150°C |
| Petrochemical Refining | SS 310S | Fluid catalytic crackers, flare tips | Cyclic thermal expansion, sulfur gases |
| Thermal Power Generation | SS 310H | Superheater tube supports, steam headers | Sustained high pressure, temps > 600°C |
| Heat Treating Services | SS 310 | Annealing baskets, radiant tube covers | Carburizing gas atmospheres |
| Cement & Glass Plants | SS 310S | Clinker cooler hardware, glass melting lehrs | High abrasive dust, extreme thermal shock |
Quality Testing & Inspection
As a dedicated SS 310/310S/310H Washers Supplier and SS 310/310S/310H Washers Exporter, Aurum Overseas subjects every manufacturing lot to comprehensive quality verification before shipment.
- Chemical Verification: Positive Material Identification (PMI) via optical emission spectroscopy to verify exact 25% chromium and 20% nickel composition.
- Mechanical & Hardness Testing: Proof load, yield strength, and Rockwell B hardness verification (<= 95 HRB) per ASTM A240 standards.
- Dimensional Precision: Optical comparator and digital micrometer inspection for thickness, inner clearance, and outer diameter tolerances per ASME B18.21.1 and DIN 125.
- Material Traceability: Complete EN 10204 3.1 Material Test Reports provided with every order, detailing full heat source and batch test results.
Global Export Markets
Aurum Overseas distributes UNS S31000 / S31008 / S31009 Washers to key industrial hubs and major engineering projects worldwide:
USA
Canada
Mexico
Germany
United
Kingdom
France
Italy
Netherlands
Norway
UAE
Saudi
Arabia
Qatar
Kuwait
Oman
Singapore
Malaysia
Australia
Frequently Asked Questions
SS 310 is the standard high-carbon alloy for general heat-resistant applications. SS 310S features lower carbon (0.08% max) to improve weldability and reduce carbide precipitation. SS 310H has controlled carbon (0.04–0.10%) for enhanced high-temperature creep strength.
These washers can handle continuous operating temperatures up to 1150°C in dry air environments, resisting oxidation and thermal scaling.
The lower carbon content in SS 310S prevents chromium carbide precipitation in the weld heat-affected zone, maintaining corrosion resistance and mechanical integrity without requiring post-weld annealing.
No, SS 310 series alloys are fully austenitic and non-magnetic in the annealed condition, retaining low magnetic permeability even after temperature cycling.
We supply SS 310/310S/310H washers manufactured to ASME B18.21.1, DIN 125, DIN 127, DIN 9021, and ISO 7089 standards, as well as custom drawing specifications.
Contact Aurum Overseas
Aurum Overseas manufactures and stocks certified SS 310/310S/310H Washers for immediate global dispatch.
Contact our technical sales team for instant pricing, material test reports, and custom size requirements.