Khaled Stainless, based in Cairo, Egypt, specializes in providing Stainless Steel 347 bolts that are designed for dependable fastening in high-temperature and corrosive environments. These bolts are crafted from niobium-stabilized 347 bar stock, featuring precise thread rolling, controlled hardness, and strict dimensional tolerances. They meet industrial fastening standards and come with full material traceability. Khaled Stainless offers both standard and custom lengths, along with heat-treatment options and optional passivation to meet specific project needs. Supplied to refineries, power plants, furnace builders, and petrochemical contractors, SS 347 bolts guarantee long-lasting joint integrity where thermal stability and resistance to intergranular corrosion are crucial.
Stainless Steel 347 is a niobium-stabilized austenitic alloy that typically contains around 17–19% chromium and 9–13% nickel. Niobium is added to bind carbon and prevent the formation of chromium carbides, with carbon levels generally kept to 0.08% or less. The typical mechanical properties of 347 bolts include a tensile strength of about 515–750 MPa, yield strength around 205–310 MPa, and elongation of roughly 30–40%, depending on the manufacturing process and heat treatment. The niobium stabilization helps maintain toughness and corrosion resistance in the weld heat-affected zone, especially during extended exposure to high temperatures, typically effective in the range of 425–900°C.
|
Material |
Specification |
Standards |
Size |
Length |
|
Stainless Steel 347 Bolts |
ASTM, ASME and API |
ASTM B 193 / ASME SB 193 |
M02 to M30 |
3 mm To 200 mm |
| Element | SS 347 |
| Tensile Strength (MPa) min | 480 |
| Yield Strength 0.2% Proof (MPa) min | 275 |
| Elongation (% in 50mm) min | 16 |
| Rockwell B (HR B) max Hardness | 95 |
| Brinell (HB) max Hardness | 201 |
| Element | SS 347 |
| Ni | 0.75 |
| C | 0.15 |
| Mn | 1.00 max |
| P | 0.04 max |
| S | 0.03 max |
| Si | 1.00 max |
| Cr | 11.5 – 13.5 |
| Mo | – |
| N | – |
Contact us to get a quick quote for your requirement.
Stainless Steel 347 bolts are high-temperature resistant fasteners with excellent corrosion resistance, especially against acids. They offer durability and strength in extreme environments, ideal for aerospace and industrial applications.
Custom Stainless Steel 347 Hex Bolt is a custom-made fastener with a square head, which provides excellent high-temperature corrosion resistance and is ideal for specialty applications requiring durability and durability in the case of in the strong.
Stainless Steel 347 leg bolt is a high-temperature resistant fastener with a threaded shaft and flat, leg-like design. It provides strong, reliable connections in harsh industrial and high-heat environments.
Stainless Steel 347 Expansion Anchor Bolt is designed to securely anchor objects into concrete or masonry. It offers high-temperature resistance and excellent corrosion protection, expanding upon installation for a strong hold.
Stainless Steel 347 hex flange head bolt features a hexagonal head with an integrated flange, ensuring secure fastening and load distribution. It provides high-temperature resistance and excellent corrosion protection.
Stainless Steel 347 full threaded bolts have a completely threaded shaft, offering consistent grip and engagement. They are designed for high-temperature applications, providing excellent strength and corrosion resistance in extreme environments.
We ensure the top quality of SS 347 Bolts by following a strict in-house testing and quality control process. We carry out an exhaustive range of tests such as tensile tests, hardness tests, and corrosion resistance tests, etc. Our promise of excellence also includes prompt delivery so that our customers get dependable products at the time of delivery, every time.
SS 347 bolts are ideal for bolted joints that experience continuous or cyclic high temperatures, welded assemblies, and corrosive environments. Common applications include bolting for boiler and superheater flanges, furnace and kiln assemblies, steam-system piping, refinery heater supports, heat-treatment equipment, exhaust systems, and petrochemical process lines. They are particularly favored in situations where welded joints might face thermal cycling and where carbide precipitation could be a concern.
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