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Stainless Steel 446 Bolts are high-chromium ferritic fasteners engineered for extreme heat and oxidation environments where conventional stainless steels begin to fail. With chromium content typically around 23%, these bolts offer exceptional resistance to scaling and corrosion at elevated temperatures, making them ideal for furnace assemblies, petrochemical processing units, thermal power plants, and industrial heat exchangers.
Unlike austenitic grades, Stainless Steel 446 Bolts maintain structural stability in dry, high-temperature conditions without significant deformation or surface degradation. They comply with international standards such as ASTM A276 and ASTM A479 for material consistency and mechanical integrity. These bolts are widely selected where long-term exposure to heat and corrosive gases is expected.
KK Fasteners supplies Stainless Steel 446 Bolts to global industries requiring precision-engineered fastening systems with full material traceability and export-grade quality control, supporting critical infrastructure projects across energy, manufacturing, and heavy engineering sectors.
| Parameter | Specification |
|---|---|
| Material | Stainless Steel 446 (AISI 446 / UNS S44600) |
| Grade | Ferritic Stainless Steel, High Chromium Alloy |
| Size Range | M6 to M64 | 1/4" to 2-1/2" |
| Thread Type | Metric (ISO), UNC, UNF |
| Standards | ASTM A276, ASTM A479, DIN 931, DIN 933, ISO 4014, ISO 4017 |
| Tensile Strength | 550 – 700 MPa (Approx.) |
| Hardness | 200 – 230 HB (Brinell Hardness) |
| Yield Strength | ~275 – 350 MPa (Approx.) |
| Surface Finish | Bright, Passivated, Black Oxide, Polished |
| Type Variants | Hex Bolt, Heavy Hex Bolt, Stud Bolt, Socket Head Bolt |
| Temperature Resistance | Up to 1100°C (Oxidation Resistant Environment) |
| Corrosion Resistance | Excellent in high-temperature oxidizing and dry atmospheric conditions |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 446 | min. | – | – | – | – | – | 23.0 | – | – | 0.10 |
| max. | 0.2 | 1.5 | 0.75 | 0.040 | 0.030 | 30.0 | – | 0.50 | 0.25 | |
| 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 | ||||
| 446 | 485 | 275 | 20 | 92 | 201 |
| 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 | |||||
| 446 | 7750 | 200 | 9.9 | 11.4 | 11.6 | 24.9 | 28.7 | 460 | 570 |
| STANDARD | WERKSTOFF NR. | UNS | JIS | GOST | EN |
| SS 446 | 1.4762 | S44600 | SUS 446 | - | X10CrAlSi25 |
All measurements in millimeters
| NOMINAL SIZE (D) | BODY DIAMETER | HEAD THICKNESS | ACROSS THE FLATS | ACROSS BOLTS CORNERS | ||||
|---|---|---|---|---|---|---|---|---|
| D (MAX) | D (MIN) | H (MAX) | H (MIN) | F (MAX) | F (MIN) | C (MAX) | C (MIN) | |
| m10 | 10.00 | 9.78 | 6.63 | 6.17 | 17.00 | 15.73 | 18.48 | 17.77 |
| m12 | 12.00 | 11.73 | 7.76 | 4.24 | 19.00 | 17.73 | 20.78 | 20.03 |
| m14 | 14.00 | 13.73 | 9.09 | 8.51 | 22.00 | 20.67 | 24.25 | 23.35 |
| m16 | 16.00 | 15.73 | 10.32 | 9.68 | 24.00 | 23.67 | 27.71 | 26.75 |
| m20 | 20.00 | 19.67 | 12.88 | 12.12 | 30.00 | 29.16 | 34.64 | 32.95 |
| m24 | 24.00 | 23.67 | 15.44 | 14.56 | 36.00 | 35.00 | 41.57 | 39.55 |
| m30 | 30.00 | 29.67 | 19.48 | 17.92 | 46.00 | 45.00 | 53.12 | 50.85 |
| m36 | 36.00 | 35.61 | 23.38 | 21.63 | 55.00 | 53.80 | 63.51 | 60.79 |
| m42 | 42.00 | 41.38 | 26.97 | 25.03 | 65.00 | 62.90 | 75.06 | 71.71 |
| m48 | 48.00 | 47.38 | 31.07 | 28.93 | 75.00 | 72.60 | 86.60 | 82.76 |
| m56 | 56.00 | 55.26 | 36.2 | 33.80 | 85.00 | 82.20 | 98.15 | 93.71 |
| m64 | 64.00 | 63.26 | 41.32 | 38.68 | 95.00 | 91.80 | 109.70 | 104.65 |
| m72 | 72.00 | 71.26 | 46.45 | 43.55 | 105.00 | 101.40 | 121.24 | 115.60 |
| m80 | 80.00 | 79.26 | 51.58 | 48.42 | 115.00 | 111.00 | 132.72 | 126.54 |
| m90 | 90.00 | 89.13 | 57.74 | 54.26 | 130.00 | 125.50 | 150.11 | 143.07 |
| m100 | 90.00 | 99.13 | 63.9 | 60.10 | 145.00 | 140.00 | 167.43 | 159.60 |
Stainless Steel 446 Bolts are used in high-temperature and oxidation-prone environments where conventional fasteners degrade rapidly. Their application is critical in thermal, chemical, and heavy industrial systems requiring long service life under heat stress.
Stainless Steel 446 Bolts are manufactured using controlled hot forging and precision CNC machining to achieve accurate thread profiles and structural consistency. The production process includes heat treatment cycles designed to stabilize ferritic grain structure and enhance high-temperature performance.
Each batch undergoes dimensional inspection, tensile testing, hardness verification, and surface finish analysis. Chemical composition is validated through spectrographic testing to ensure compliance with ASTM standards. KK Fasteners integrates full lot traceability, enabling documentation from raw material stage to final inspection reports.
Quality certifications such as ISO 9001:2015, RoHS, and REACH compliance support global industrial acceptance, ensuring reliability in mission-critical applications.
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Stainless Steel 446 Bolts are high-chromium ferritic fasteners designed for extreme temperature and oxidation resistance. They are commonly used in furnace equipment, thermal processing units, and industrial systems where exposure to high heat can degrade standard stainless steels. Their strength and scaling resistance make them suitable for continuous high-temperature service.
SS 446 contains approximately 23% chromium, which forms a stable protective oxide layer. This layer prevents surface scaling and oxidation even at elevated temperatures up to around 1100°C. Its ferritic structure also ensures thermal stability in dry, heat-intensive environments.
These bolts are typically manufactured in compliance with ASTM A276 and ASTM A479 standards for material properties. Dimensional specifications may follow DIN 931, DIN 933, ISO 4014, and ISO 4017 depending on bolt type and application requirements.
They are widely used in furnace assemblies, petrochemical plants, cement kilns, heat exchangers, and power generation systems. These applications require fasteners that can withstand prolonged exposure to high temperatures and oxidizing atmospheres without structural degradation.
A reliable supplier should provide material traceability, certified testing reports, and compliance with international standards. Buyers should also evaluate manufacturing capability, export experience, and quality inspection systems. Companies like KK Fasteners support global procurement with certified documentation and controlled production processes.
Stainless Steel 446 Bolts are engineered for industries where heat resistance and oxidation stability define operational safety and equipment lifespan. With controlled manufacturing and strict quality validation, KK Fasteners supports global industrial clients with reliable supply, technical documentation, and customized fastener solutions.
For detailed specifications, pricing, or project-based requirements, connect with the engineering team at KK Fasteners to request a quotation or technical datasheet today.
