Stainless Steel 347H is an austenitic stainless steel that stands out due to its remarkable resistance to
intergranular corrosion and its ability to withstand high temperatures. This grade, known for its high
carbon content, enhances its creep resistance, making it an ideal choice for applications requiring
prolonged exposure to elevated temperatures.
One of the key benefits of Stainless Steel 347H is its excellent oxidation resistance, which remains
effective even at temperatures up to 1500°F (816°C). This property makes it particularly suitable for
high-pressure boiler tubes, radiant superheaters, and high-temperature chemical processes. Additionally,
it is commonly used in the aerospace industry, furnace parts, and in the manufacturing of equipment that
processes high-temperature gases.
Another significant advantage of 347H is its resistance to sensitization, thanks to its stabilization with
niobium. This stabilization helps in preventing chromium carbide precipitation at grain boundaries, thus
ensuring that the steel retains its corrosion resistance in as-welded conditions. This characteristic is
especially beneficial in environments where welding is frequent, as it reduces the risk of weld decay.
At Ferrobend, we understand the importance of quality and reliability in your projects. Our Stainless
Steel 347H products are manufactured to the highest standards, ensuring superior performance and
longevity. Whether you are working on industrial furnaces, heat exchangers, or any high-temperature
application, Ferrobend's 347H offers unmatched reliability and efficiency.
Elements | Cr | Ni | C | Si | Mn | P | S | Mo | Fe |
---|---|---|---|---|---|---|---|---|---|
% | min: 17.0 ,max:19.0 | min: 8.0 ,max: 10.0 | 0.15 max | 1.00 max | 2.0 max | 0.20 max | 0.15 min | 0.75 | balance |
Tensile Strength ksi (min.) | Yield Strength 0.2% Offset ksi (min.) | Elongation - % in 50 mm (min.) | Hardness (Brinell) MAX | Hardness (Rockwell B) MAX |
---|---|---|---|---|
75 | 30 | 35 | 228 | - |
Denstiy lbm/in3 | Coefficient of Thermal Expansion (min/in)-°F | Electrical Resistivity mW-in | Thermal Conductivity BTU/hr-ft-°F | Melting Range | |||||||
---|---|---|---|---|---|---|---|---|---|---|---|
at 68 °F | at 68 – 212°F | at 68 – 932°F | at 68 – 1450°F | at 68°F | at 212°F | at 392°F | at 752°F | at 1112°F | at 1472°F | at 68 – 212°F | - |
0.29 | 9.2 | 10.4 | 10.9 | 28.3 | 30.7 | 33.8 | 39.4 | 43.7 | 47.6 | 113.2 | 2552°F |
SAE / AISI | 303 |
UNS | S30300 |
EN Material Number | 1.4305 |
EN Material Name | X8CrNiS18-9 |
DIN Material Name | X8CrNiS18-9 |
JIS | SUS 303 |
BS | 202S 21 En58M |