Home >Stainless Steel 446 Bolts
Stainless Steel 446 Bolts are top-notch fastening components crafted for the toughest industrial environments, where extreme temperatures and corrosive conditions are the norm. Made from ferritic stainless steel, these bolts boast impressive resistance to oxidation, scaling, and thermal fatigue, even when the heat soars above 1100°C. Renowned for their outstanding heat endurance and reliability, SS 446 Bolts are the go-to choice for equipment that faces constant high temperatures or harsh chemical atmospheres. They deliver excellent dimensional stability, a long service life, and robust mechanical strength under heavy loads, making them perfect for situations where regular stainless steel bolts just can’t cut it. Their durability and resistance to sulfide, chloride, and oxidizing agents ensure that they provide secure and safe fastening, even in the most challenging operating conditions.
These bolts primarily consist of a high chromium content, ranging from about 23–27%, along with carbon, manganese, silicon, sulfur, and a hint of nickel. This unique blend gives them remarkable resistance to high-temperature scaling, oxidation, and chemical corrosion. On the mechanical side, SS 446 boasts a tensile strength of around 485 MPa and a yield strength close to 275 MPa, along with excellent creep resistance when faced with elevated thermal stress. The material maintains its structural integrity during extended heat exposure and thermal cycling, ensuring reliable fastening performance in demanding industrial settings.
| Specifications | : | ASTM A 193 ASME SA 193 |
| Standard | : | DIN, ASTM, BS and all International Standards |
| Length | : | 3 mm to 200 mm |
| Size | : | M3 – M56 | 3/6″ to 2″ | Custom Sizes |
| Type | : | Hex Head Bolts, Square Bolts, U bolts, Eye bolts, T bolt, Hex Bolt, Lag Bolts, Counter sunk Bolts. |
| 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 |
You’ll find Stainless Steel 446 Bolts widely used in applications that require heat-resistant, corrosion-proof, and mechanically strong fasteners. They’re commonly found in furnace parts, boilers, kiln structures, heat exchangers, annealing equipment, and high-temperature exhaust systems. These bolts also play a crucial role in petrochemical plants, power generation facilities, chemical processing, thermal processing equipment, and refineries. Their robust performance makes them ideal for gas turbines, incinerators, industrial burners, and refractory equipment. SS 446 Bolts truly provide dependable fastening solutions in severe atmospheres.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
