Mitchell Stainless, located in Hamilton, New Zealand, is a trusted supplier of Stainless Steel 347H flanges designed for demanding industrial environments. These flanges are well known for their ability to perform reliably at high temperatures and under pressure. Manufactured with precision and strict quality control, they offer long service life and consistent performance. Mitchell Stainless focuses on delivering products that meet international standards while providing dependable supply and customer support, making them a preferred choice for industries that require strength, stability, and heat resistance.
Stainless Steel 347H flanges are produced from a high-carbon austenitic stainless steel alloy stabilized with niobium. This composition improves creep strength and prevents intergranular corrosion during welding and prolonged high-temperature service. The material provides higher tensile and yield strength than standard 347 grades, along with excellent oxidation resistance. It also offers good weldability, toughness, and structural stability, allowing the flanges to maintain their integrity even under extreme thermal and pressure conditions.
| Standard | ASTM A182 / ASME SA182 |
| Dimensions | ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN |
| Standard | ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges |
| Size | 1/2″ (15 NB) to 48″ (1200NB) |
| Class/Pressure | 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 |
| Flange Face Type | Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ) |
| Grade | C | Mn | Si | P | S | Cr | Cb | Ni | Fe |
| 347H | 0.08 | 2.0 | 1.0 | 0.045 | 0.030 | 17.00 – 20.00 | 10xC – 1.10 | 9.00 – 13.00 | 62.74 min |
| 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 | ||||
| 347H | 515 | 205 | 35 | 92 | 201 |
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SS 347Hsocket weld flanges, manufactured from stainless steel alloy 347H, ensure secure pipe connections with enhanced corrosion resistance and high-temperature strength, suitable for high-pressure systems in various industries.
SS 347H ring type joint flanges, constructed from stainless steel alloy 347H, provide leak-proof connections with excellent corrosion resistance and high-temperature performance, ideal for high-pressure and critical service applications.
SS 347H forged flanges, made from stainless steel alloy 347H, offer superior strength, excellent corrosion resistance, and high-temperature endurance, making them ideal for demanding industrial applications and high-pressure environments.
We conduct various rigorous tests, including dimensional, mechanical, and chemical analysis, to ensure the highest quality of our Stainless Steel 347H Flanges. Our in-house quality control team oversees all processes, complemented by third-party inspections to guarantee compliance with industry standards. With a commitment to prompt delivery we ensure that our clients receive their products on time, every time.
Stainless Steel 347H flanges are widely used in systems that operate at elevated temperatures and pressures. Common applications include power plants, oil and gas facilities, petrochemical units, and chemical processing industries. They are ideal for steam pipelines, heat exchangers, boilers, pressure vessels, and refinery piping systems. Their superior heat resistance, strength, and corrosion protection make them suitable for critical services where safety, durability, and long-term reliability are essential.
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