Harsh Metalloys, a reputable manufacturer and supplier based in Mumbai, India, specializes in high-quality Stainless Steel 347H Bolts that are perfect for high-temperature and high-pressure applications. SS 347H is a high carbon variant of SS 347, enhanced with niobium (columbium) to offer outstanding resistance to intergranular corrosion and improved creep strength. These bolts are particularly suited for environments that experience repeated thermal cycling and harsh chemical exposure. Manufactured in line with ASTM, DIN, and ASME standards, our 347H bolts guarantee durability, strength, and reliability in chemical processing, heat exchangers, furnace systems, and power plant infrastructure.
Stainless Steel 347H Bolts are composed of 17–20% Chromium, 9–13% Nickel, and 0.04–0.10% Carbon, with stabilization from Niobium (Nb ≥ 10xC) to avoid carbide precipitation. This high carbon content enhances creep resistance and strength at elevated temperatures. These bolts boast a tensile strength ranging from 515–690 MPa, excellent oxidation resistance up to 870°C, and solid mechanical performance even under extended thermal exposure. SS 347H is non-magnetic in its annealed state, weldable, and provides high corrosion resistance, especially in conditions with frequent thermal cycling or strong oxidizing agents.
Material | Specification | Standards | Size | Length |
Stainless Steel 347H Bolts | ASTM, ASME and API | ASTM B 193 / ASME SB 193 | M02 to M30 | 3 mm To 200 mm |
| Element | SS 347H |
| 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 347H |
| 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 | – |
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These robust, corrosion-resistant 347H bolts are crafted for high-temperature and high-stress settings, ensuring a secure hold in power plants, chemical processing facilities, and aerospace applications.
Our tailor-made 347H hex bolts offer a precise fit, outstanding heat resistance, and the strength needed for critical structural and mechanical assemblies that face extreme temperatures.
The 347H leg bolts provide dependable fastening with improved oxidation resistance and tensile strength, making them perfect for industrial equipment and high-temperature structural uses.
These high-strength 347H expansion anchor bolts ensure secure anchoring in concrete and masonry, standing up to corrosion and thermal stress in industrial and high-temperature environments.
The 347H hex flange head bolts merge flange support with high-temperature corrosion resistance, offering strong, vibration-resistant fastening for both mechanical and structural assemblies.
Fully threaded 347H bolts guarantee maximum grip and load distribution, making them ideal for demanding applications that require durability and heat resistance in the power, chemical, and refinery sectors.
Stainless Steel 347H Bolts are extensively used in high-temperature service applications such as boilers, superheaters, heat exchangers, and pressure vessels. In chemical and petrochemical industries, they are used in reactor vessels, piping systems, and processing equipment due to their resistance to aggressive media and thermal fatigue. These bolts are also employed in aerospace systems, power plants, oil refineries, and exhaust ducts where high creep resistance and thermal stability are essential. The combination of strength, corrosion resistance, and reliability makes SS 347H bolts a preferred choice for bolted assemblies in demanding industrial environments.
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