Table of Contents
- SS 446 Washers Overview
- SS 446 Washers Specifications
- SS 446 Technical Properties & Composition
- SS 446 vs. SS 310S
- Why Industries Prefer SS 446 Washers
- Types of SS 446 Washers
- Key Technical Advantages
- Key Applications of SS 446 Washers
- Quality Testing & Inspection
- Global Export Markets
- Frequently Asked Questions
- Contact Aurum Overseas
SS 446 Washers Suppliers & Exporters
Aurum Overseas is a stockist and global SS 410 Washers Supplier and SS 410 Washers Exporter, offering high-strength martensitic UNS S41000 Washers designed to ASME B18.21.1, DIN 125, and ISO 7089 standards for heavy load-bearing applications.
Heat-treated through quenching and tempering for exceptional hardness and wear resistance, our fully certified washers are shipped fast to project sites across North America, Europe, the Middle East, and the Asia-Pacific region.
SS 446 Washers Specifications
| Parameter | Technical Specification / Standard Range |
|---|---|
| Material Grade | Stainless Steel 446 (UNS S44600) |
| UNS Designation | UNS S44600 Washers |
| Werkstoff Number | 1.4762 |
| Manufacturing Standards | ASTM A240 / ASME SA240, ASTM F436 |
| Dimensional Specifications | ASME B18.21.1, DIN 125 A/B, DIN 127 B, DIN 9021, ISO 7089, ISO 7090 |
| Washer Types | Flat Washers, 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, PTFE Coated |
| Certification | EN 10204 3.1 MTR, PMI Testing Report, Hardness Verification |
SS 446 Technical Properties & Composition
Chemical Composition of UNS S44600 Washers (%)
| Element | SS 446 (UNS S44600) |
|---|---|
| Carbon (C) | 0.20 max |
| Manganese (Mn) | 1.50 max |
| Silicon (Si) | 0.75 max |
| Phosphorus (P) | 0.040 max |
| Sulfur (S) | 0.030 max |
| Chromium (Cr) | 23.00 – 30.00 |
| Nitrogen (N) | 0.10 – 0.25 |
| Nickel (Ni) | 0.50 max |
| Iron (Fe) | Balance |
Mechanical Properties of UNS S44600 Washers
| Property / Parameter | SS 446 (UNS S44600) |
|---|---|
| Tensile Strength (MPa / psi) | 485 MPa / 75,000 psi min |
| Yield Strength 0.2% Offset (MPa / psi) | 275 MPa / 40,000 psi min |
| Elongation (% in 50mm) | 20% min |
| Density | 7.5 g/cm³ |
| Melting Point Range | 1510°C (2750°F) |
| Microstructural Classification | Ferritic Non-Hardenable |
Equivalent Grades of SS 446 Washers
| Standard / System | SS 446 |
|---|---|
| UNS Designation | S44600 |
| Werkstoff Nr. | 1.4762 |
| EN Standard | X10CrAlSi25 |
| AFNOR Equivalent | Z10 C25 |
SS 446 vs. SS 310S
| Feature | SS 446 (UNS S44600) | SS 310S (UNS S31008) |
|---|---|---|
| Alloy Microstructure | High-Chromium Ferritic Structure | High Nickel-Chromium Austenitic Structure |
| Nickel Content | Low / Restricted (0.50% max) | High Nickel Content (19.0 - 22.0%) |
| Sulfidation Resistance | Superior in reducing high-sulfur gases | Poor (Susceptible to nickel-sulfide eutectic) |
| Molten Metal Resistance | Resists molten lead, copper, and tin | Corrodes rapidly under molten non-ferrous metals |
| Thermal Expansion | Low rate (Prevents flange warping) | High thermal expansion rate |
| Thermal Conductivity | Higher heat conduction efficiency | Lower heat conduction efficiency |
Why Industries Prefer SS 446 Washers
Handles Extreme Thermal Stress: Retains structural stability and surface integrity in continuous operating temperatures up to 1095°C without cracking.
Prevents Joint Leaks: Low coefficient of thermal expansion prevents joint loosening during sudden heat cycles.
Resists Corrosion & Oxidation: High 23–30% chromium content creates a dense oxide layer that blocks sulfur gas, ash, and furnace slag attack.
Longer Service Life: Ferritic composition resists scaling and spalling, ensuring reliable load distribution over extended maintenance cycles.
Smooth & Easy Assembly: Cold-stamped and deburred surfaces allow seamless bolting alignment and smooth torque control.
Types of SS 446 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 446 Plain Washers
SS 446 Spring Washers
SS 446 Lock Washers
SS 446 Square Washers
SS 446 Conical Washers
Key Technical Advantages
High-Chromium Ferritic Matrix
The 23–30% chromium formulation forms a self-healing surface oxide scale that eliminates thermal spalling under steady furnace conditions.
Resistance to Sulfidation & Ash Corrosion
Lacking high nickel content, UNS S44600 Washers do not form low-melting-point nickel-sulfide eutectics, making them ideal for high-sulfur environments.
Immunity to Molten Non-Ferrous Metals
Resists dissolution and liquid metal embrittlement when in contact with molten lead, copper, brass, and tin.
Low Thermal Expansion Rate
Matches carbon steel expansion characteristics more closely than austenitic grades, reducing cyclic mechanical stress on flange bolts.
Nitrogen Strengthened Structure
Controlled nitrogen additions (0.10–0.25%) improve grain stability and tensile strength at high temperatures.
Key Applications of SS 446 Washers
| Industry Sector | Recommended Grade | Typical Equipment Application | Service Conditions |
|---|---|---|---|
| Thermal Processing & Kilns | SS 446 / S44600 | Furnace dampers, combustion chamber baffles | Direct flue gas exposure, continuous heat to 1095°C |
| Glass Manufacturing | SS 446 / S44600 | Regenerator internal tie-rods, mold hardware | Contact with molten glass, sulfur-bearing fuel gases |
| Non-Ferrous Smelting | SS 446 / S44600 | Lead and copper refining pot mountings | Contact with molten metal splash and heavy slag |
| Boiler & Incineration | SS 446 / S44600 | Soot blower elements, coal burner nozzles | High-sulfur flue gases, fly ash erosion |
| Petrochemical Processing | SS 446 / S44600 | Thermal cracker internal supports, flare tips | Reducing sulfidizing atmospheres |
Quality Testing & Inspection
Aurum Overseas operates strict quality control measures for every shipment as a trusted SS 446 Washers Supplier:
- Positive Material Identification (PMI): XRF alloy analysis to confirm 23–30% chromium content and verify nickel is restricted below 0.50%.
- Mechanical Strength Verification: Tensile testing (485 MPa min) and yield strength checks (275 MPa min) per ASTM F436 and ASTM A240 standards.
- Hardness & Microstructure Testing: Rockwell B hardness control (<= 95 HRB) to ensure optimal ductility during high-torque assembly.
- Dimensional Inspection: Laser clearance micrometer checks for exact inner diameter, outer diameter, and gauge thickness per ASME B18.21.1 and DIN 125.
- Certifications: Supplied with EN 10204 3.1 Material Test Reports providing chemical and mechanical test compliance.
Global Export Markets
Aurum Overseas, a global SS 446 Washers Exporter, supplies certified UNS S44600 Washers to industrial 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 446 is a ferritic stainless steel with minimal nickel content (0.50% max). High nickel grades like 310S form low-melting-point nickel-sulfide eutectics in sulfur-rich atmospheres, whereas SS 446 resists sulfidation and ash attack up to 1095°C.
Yes, UNS S44600 Washers resist liquid metal embrittlement and dissolution from molten lead, tin, copper, and brass, making them suitable for non-ferrous smelting equipment.
SS 446 washers provide continuous heat resistance up to 1095°C (2000°F) in oxidizing environments without severe scaling or oxidation.
Because SS 446 has a ferritic crystal structure rather than an austenitic structure, its thermal expansion rate is significantly lower. This prevents thermal stress and flange bolt loosening during heating cycles.
Yes, as a ferritic stainless steel, SS 446 is magnetic in all conditions (both annealed and cold-worked).
Yes, as a reliable SS 446 Washers Exporter, every batch includes an EN 10204 3.1 Material Test Report detailing chemical composition, mechanical properties, and heat treatment verification.
Contact Aurum Overseas
Aurum Overseas manufactures and stocks certified SS 446 Washers for immediate global dispatch.
Contact our technical sales team for instant quotes, material certification, and custom size requirements.