Harsh Metalloys, a well-known manufacturer and supplier located in Mumbai, India, specializes in high-performance Stainless Steel 347 Fasteners that are perfect for demanding industrial applications. SS 347 is an austenitic stainless steel alloy that’s stabilized with niobium (columbium), which significantly boosts its resistance to intergranular corrosion—especially after welding and when exposed to high temperatures. These fasteners are crafted in line with ASTM and ASME standards and come in various forms, including bolts, nuts, washers, screws, and threaded rods. Their remarkable mechanical strength, corrosion resistance, and weldability make them a top choice for the chemical, petrochemical, and power generation sectors.
Stainless Steel 347 Fasteners generally consist of 17–20% Chromium and 9–13% Nickel, with Niobium (Nb ≥ 10xC) added for stabilization. This addition helps prevent carbide precipitation during welding and high-heat exposure. These fasteners boast a tensile strength ranging from 515–690 MPa and can reliably perform at temperatures as high as 870°C. They are non-magnetic in their annealed state, highly resistant to oxidation, and maintain their strength even under thermal cycling. SS 347 fasteners demonstrate outstanding mechanical integrity and corrosion resistance in both oxidizing and corrosive environments, making them an excellent choice for long-term industrial use.
|
Material |
Specification |
Standards |
Size
|
Length |
|
Stainless Steel 347 Fasteners
|
IS
BS
ASTM
|
ASTM / ASME – A/ SA 193 |
3 mm
to
200 mm
|
M02 to M33
|
| Grade | Mn | N | P | C | S | Cr | Mo | Si | Ni | Other | |
| 347 | min. max | 2.00 | – | 0.045 | – 0.08 | 0.030 | 17.0 19.0 | – | 0.75 | 9.0 13.0 | Nb=10(C+N) 1.0 |
| 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 | ||||
| 347 | 515 | 205 | 40 | 92 | 201 |
Contact us to get a quick quote for your requirement.
These high-strength 347 nuts are designed to resist corrosion and oxidation, ensuring that your fastenings stay secure even in high-temperature industrial and chemical settings.
Our durable 347 stud bolts deliver robust, heat-resistant threaded connections, making them perfect for pressure vessels, pipelines, and machinery that operates in high-heat environments.
With their corrosion-resistant properties, 347 bolts provide outstanding mechanical strength and thermal stability, making them ideal for structural and industrial applications that require high heat resistance.
These versatile 347 threaded rods feature continuous threading for adjustable fastening, offering superior heat and corrosion resistance for heavy-duty applications.
Precision-engineered 347 screws guarantee reliable fastening, boasting oxidation resistance and strength for use in high-temperature, chemical, and industrial assembly tasks.
Our 347 washers are designed to evenly distribute load and resist corrosion in high-temperature bolted joints, enhancing durability and stability in various industrial applications.
We always focuse on customer experience by way of our quality Stainless Steel 347 Fasteners. Every consignment comes attached with commercial invoices, packing lists, heat treatment charts, plans for quality assurance, and the NABL-approved lab test reports to establish genuineness and quality with client satisfaction.
Stainless Steel 347 Fasteners are widely used in high-temperature and corrosive environments where welding and long-term exposure to heat are common. They are ideal for use in heat exchangers, pressure vessels, boilers, superheaters, and exhaust systems. Industries such as chemical processing, petrochemicals, oil & gas, aerospace, and power generation rely on these fasteners for secure and durable assemblies. Their resistance to intergranular corrosion makes them suitable for use in welded structures, while their high creep strength ensures stability in elevated temperature service. SS 347 fasteners are a reliable choice for demanding mechanical and structural applications.
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