1.4550 AISI 347 347H stainless steel Alloys

1.4550 AISI 347 347H stainless steel Alloys - 图片 2

1.4550 AISI 347 347H stainless steel Alloys

Maintenance and Care：

—-Regularly clean the surface
—-Avoid using cleaning agents containing chloride ions
—-Store in a dry and ventilated place

产品描述

Grade 347 is a niobium-containing austenitic stainless steel, and 347H is its high-carbon variant; the key difference in their elemental composition lies in the levels of carbon, titanium, and niobium.

Analysis of Key Differences Between 347 and 347H Stainless Steels

347 chemical component：

（Cr）：17.00%-19.00%

（Ni）：9.00%-13.00%

（Nb/Ta）：10*C-1.10%

（Mn）：2.00%

（Si）：1.00%

（P）：0.040%

（S）：0.030%

（C）：0.08%

347H chemical component：

Cr：17.00~19.00

Ni：9.00~12.00

Nb：0.1~1.00

Mn：≤2.00

Si：≤1.00

P：≤0.045

S：≤0.030

C：≤0.04-0.10

347 mechanical property：

Tensile Strength: ≥515 MPa

Yield Strength: ≥205 MPa

Elongation: ≥40%

Hardness: ≤201 HB; ≤95 HRB; ≤219 HV

347H mechanical property：

Tensile strength (Rm): ≥ 515 MPa

Yield strength (Rp0.2): ≥ 205 MPa

Elongation (A): ≥ 35%

Hardness: ≤ 187 HB (Brinell hardness) or ≤ 90 HRB (Rockwell hardness)

347 High-Temperature Performance：

In intermittent high-temperature scenarios, carbides may precipitate in 347 Stainless Steel.

347 H High-Temperature Performance：

347H has a higher carbon content and offers approximately 20% better high-temperature creep resistance than SS347, making it suitable for sustained high-temperature environments.

347 Processing and welding performance：

Due to the stabilizing effect of niobium, 347 stainless steel is less prone to intergranular corrosion during welding, and various welding methods can be adopted, ensuring the welding quality easily.

347H Processing and welding performance：

When welding 347H, it is necessary to pay more attention to controlling the welding process parameters to avoid possible welding defects caused by the high carbon content.

347 application scenarios：

“Corrosion-resistant + High-temperature equipment”