Table of Contents
- SS 446 Nuts Overview
- SS 446 Nuts Specifications
- What are Stainless Steel 446 Nuts?
- SS 446 Technical Properties & Composition
- Why Industries Prefer SS 446 Series Nuts
- Types of SS 446 Series Nuts
- Key Advantages of UNS S44600 Series Nuts
- Key Applications of SS UNS S44600 Series Nuts
- SS 446 Nuts vs SS 310 Nuts
- Quality Testing & Inspection
- Global Export Markets
- Frequently Asked Questions
- Contact Aurum Overseas
SS 446 Nuts Suppliers & Exporters
Aurum Overseas is a premier SS 446 Nuts Supplier and specialized SS 446 Nuts Exporter. Grade 446 is a high-chromium ferritic stainless steel engineered for extreme thermal service up to 1093°C (2000°F). Characterized by a high chromium content (23.0% to 30.0%), these ferritic fasteners provide exceptional resistance to high-temperature oxidation, sulfidation, and molten metal corrosion.
Manufactured under strict ASTM A276 and ASTM A479 specifications, UNS S44600 Nuts retain dimensional stability in non-load-bearing, high-heat structural environments where nickel-bearing alloys suffer from sulfur attack. As an international SS 446 Nuts Exporter, Aurum Overseas supplies fully certified bolting solutions across the USA, Germany, UK, UAE, Saudi Arabia, and Qatar.
SS 446 Nuts Specifications
| Parameter | Specification / Technical Range |
|---|---|
| Material Grade | Stainless Steel 446 |
| UNS Number | UNS S44600 |
| Werkstoff Number | 1.4762 |
| Manufacturing Standards | ASTM A276, ASTM A479, ASME SA479, DIN 934, ISO 4032, BS |
| Size Range | M3 to M100 | 3/16" to 4" | Custom Sizes Available |
| Length Range | 3 mm to 200 mm | Custom Lengths Available |
| Thread Configuration | ASME B1.1 2A/3A - 2B/3B Unified (UNC, UNF) & B1.13M 6h-6G Metric |
| Special Fastener Formats | SS 446 Hex Head Nuts, SS 446 Square Nuts, SS 446 T Nuts, SS 446 Eye Nuts |
| Surface Finishes | Bright Polished, Passivated, Solution Annealed, Black Oxide |
| Certifications | EN 10204 3.1 Material Test Certificate |
What are Stainless Steel 446 Nuts?
Stainless Steel 446 (UNS S44600 / 1.4762) nuts are high-chromium (23.0%–30.0%) ferritic fasteners built for severe heat up to 1093°C (2000°F). They provide exceptional resistance to oxidation and sulfur-rich atmospheres where regular austenitic grades fail.
SS 446 Technical Properties & Composition
The chemical composition and mechanical properties of SS 446 are specifically calibrated to deliver maximum oxidation resistance, superior sulfidation immunity, and dimensional stability in extreme high-temperature service environments.
Chemical Composition of UNS S44600 Nuts (%)
| Element | Percentage |
|---|---|
| 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) | 23.0 - 30.0 |
| Nickel (Ni) | 0.50 max |
| Nitrogen (N) | 0.10 - 0.25 |
Mechanical Properties of SS 446 Nuts
| Property / Parameter | SS 446 |
|---|---|
| Tensile Strength (MPa) min | 485 |
| Yield Strength 0.2% Proof (MPa) min | 275 |
| Elongation (% in 50mm) min | 20 |
| Hardness Rockwell B (HR B) max | 92 |
| Hardness Brinell (HB) max | 201 |
Equivalent Grades of SS 446 Nuts
| Standard | Werkstoff Nr. | UNS | JIS | EN |
|---|---|---|---|---|
| SS 446 | 1.4762 | S44600 | SUH 446 | X10CrAlSi25 |
Why Industries Prefer SS 446 Series Nuts
High-temperature plant operators specify UNS S44600 nuts for sulfur-rich combustion environments where nickel-heavy alloys quickly fail.
Because SS 446 is a high-chromium ferritic stainless steel with almost no nickel, it forms a dense oxide layer that protects against scaling, sulfur damage, and molten metal corrosion at temperatures up to 1093°C (2000°F). As a certified SS 446 Nuts Supplier, Aurum Overseas supplies these heat-resistant fasteners to industrial boiler plants, glass manufacturers, and thermal incinerators worldwide.
Types of SS 446 Series Nuts
Aurum Overseas supplies a comprehensive range of stainless steel nut configurations manufactured according to standard DIN, ASME, and ISO dimensional tolerances for multiple engineering assemblies.
SS 446 Hex Head Nuts
SS 446 Square Nuts
SS 446 Lock Nuts
SS 446 Eye Nuts
SS 446 Wing Nuts
SS 446 T Nuts
SS 446 Panel Nuts
SS 446 Coupling Nuts
SS 446 Heavy Hex Nuts
Key Advantages of UNS S44600 Series Nuts
Extreme Scaling Resistance
Protects against heavy surface flaking and oxidation in continuous heat up to 1093°C (2000°F).
Immunity to Sulfidation
Low nickel content prevents liquid nickel-sulfide damage in sulfur-rich flue gases.
Resists Molten Metal Attack
Highly stable against molten copper, brass, and lead in non-ferrous smelting operations.
Low Thermal Expansion
Ferritic structure expands less than austenitic steels, reducing stress on joint flanges during heating.
Nitrogen-Strengthened
High nitrogen levels refine the internal grain structure to maintain mechanical stability at high heat.
Key Applications of SS UNS S44600 Series Nuts
Our stainless steel 446 nuts are deployed globally in industrial furnaces, glass manufacturing plants, thermal incinerators, and high-sulfur petrochemical processing facilities.
| Industry Sector | Primary Fastener Application |
|---|---|
| Industrial Furnaces & Boilers | Soot blower elements, burner nozzles, and baffle plate bolting |
| Glass Manufacturing | Furnace structural supports and molten glass handling hardware |
| Thermal Incineration | Municipal and hazardous waste incinerator combustion chamber flanges |
| Petrochemical Processing | Thermal cracker tube supports and high-sulfur direct-fired heater joints |
| Non-Ferrous Metallurgy | Smelting furnace components and copper/lead reclamation vessel bolting |
SS 446 Nuts vs SS 310 Nuts
When selecting the ideal high-temperature fastener grade, understanding the performance differences between ferritic SS 446 and austenitic SS 310 is essential.
| Comparison Factor | SS 446 Nuts | SS 310 Nuts |
|---|---|---|
| Alloy Family | Ferritic (High Chromium, Low Nickel) | Austenitic (High Chromium, High Nickel) |
| Sulfur Resistance | Superior in high-sulfur / reducing gas atmospheres | Vulnerable to sulfur attack above 600°C due to high nickel |
| Continuous Temp Limit | Up to 1093°C (2000°F) | Up to 1150°C (2100°F) |
| Thermal Expansion | Lower thermal expansion rate (less stress on joints) | Higher thermal expansion rate |
| High-Temp Structural Load | Moderate load capacity; best for non-stressed heat shields | High mechanical creep and rupture strength |
| Detailed Specifications | Current Page | View SS 310 Nuts Specs → |
Quality Testing & Inspection
Aurum Overseas implements rigorous inspection protocols to ensure every order shipped as an SS 446 Nuts Exporter meets international heat-resistant standards.
| Test / Inspection Standard | Technical Verification Scope |
|---|---|
| Positive Material Identification (PMI) | Spectroscopic verification confirming 23–30% Chromium and low Nickel content |
| Hardness Verification | Rockwell B and Brinell hardness testing per ASTM standards |
| Dimensional Inspection | Thread pitch, profile, and concentricity verification per ASME B18.2.2 |
| Grain Structure & Surface Check | Ferritic grain integrity and surface scale check post annealing |
| Certifications | Complete material test reports per EN 10204 3.1 |
Global Export Markets
As an international SS 446 Nuts Exporter, Aurum Overseas delivers securely packaged, export-ready fasteners to industrial buyers worldwide.
USA
Canada
Mexico
Germany
United Kingdom
France
Italy
Netherlands
Belgium
Spain
Poland
UAE
Saudi Arabia
Qatar
Kuwait
Oman
Bahrain
Frequently Asked Questions
UNS S44600 nuts offer maximum resistance to oxidation, scaling, and sulfidation up to 1093°C (2000°F). Their low nickel content makes them immune to sulfur damage that ruins nickel-based alloys in sulfur-bearing flue gases.
Yes, because SS 446 is a ferritic stainless steel, UNS S44600 nuts are magnetic in all conditions.
SS 446 nuts are primarily used for scaling and corrosion resistance at high temperatures. For applications requiring extreme mechanical tensile strength or load-bearing creep resistance under thermal load, austenitic grades like SS 310 or Inconel alloys are recommended.
Aurum Overseas supplies SS 446 Hex Head Nuts, SS 446 Square Nuts, SS 446 T Nuts, and heavy forged SS 446 Eye Nuts tailored to customer drawings.
Yes, Aurum Overseas regularly exports certified SS 446 fasteners to industrial plants across the USA, European hubs (Germany, UK, France), and GCC nations (UAE, Saudi Arabia, Qatar).
Yes, every shipment from Aurum Overseas includes complete EN 10204 3.1 Mill Test Certificates detailing chemical breakdown, mechanical properties, and heat traceability.
Contact Aurum Overseas
Aurum Overseas provides quick quotes, full mill test reports, and reliable export delivery for all your heat-resistant fastener requirements.
Contact our sales department for pricing and technical support.