Which is more acid-resistant, Hastelloy or 316L stainless steel?
Hastelloy is corrosion-resistant, but of course the price is much higher than 316L, so the working conditions and cost must be considered.
Hastelloy grades: Hastelloy C276, Hastelloy C22, Hastelloy C-2000, Hastelloy C-4, Hastelloy C, Hastelloy B, Hastelloy B-2, Hastelloy B-3, Hastelloy X, Hastelloy G-30, Hastelloy G-35, etc. .
Here are some general references:
The most commonly used Hastelloy C-276 Hastelloy, a nickel-chromium-molybdenum alloy, is resistant to high temperatures and corrosion.
Overview of Hastelloy C-276 characteristics and application fields:
This alloy has excellent corrosion resistance to most corrosive media in both oxidized and reduced states. Excellent resistance to pitting corrosion, crevice corrosion and stress corrosion cracking. The alloy is suitable for use in a variety of chemical process industries containing oxidizing and reducing media. The higher molybdenum and chromium content makes the alloy resistant to chloride ion erosion, and the tungsten element further improves its corrosion resistance. Hastelloy C-276 is one of the only materials that is resistant to corrosion by moist chlorine, hypochlorite and chlorine dioxide solutions. The alloy has significant corrosion resistance to high concentrations of chloride salt solutions (such as chlorine iron and copper chloride).
Hastelloy C-276 similar grades:
W.Nr.2.4819 NiMo16Cr15W (Germany) NC17D (France)
Hastelloy C-276 metallographic structure:
The alloy has a face-centered cubic lattice structure.
Hastelloy C-276 process performance and requirements:
1. The lower the sulfur content in thermal processing fuel, the better. The sulfur content in natural gas should be less than 0.1%, and the sulfur content in heavy oil should be less than 0.5%.
2. The thermal processing temperature range of the alloy is 1200℃~950℃, and the cooling method is water cooling or rapid air cooling.
3. Suitable for any traditional welding process, such as tungsten electrode inert gas shielded welding, plasma arc welding, manual sub-arc welding, metal pole inert gas shielded welding, and melting pole inert gas shielded welding.
Hastelloy C-276 main specifications:
Hastelloy C-276 seamless pipe, Hastelloy C-276 steel plate, Hastelloy C-276 round steel, Hastelloy C-276 forgings, Hastelloy C-276 flange, Hastelloy C-276 ring, Hastelloy C-276 welded pipe, Hastelloy C- 276 steel strip, Hastelloy C-276 straight bar, Hastelloy C-276 wire and supporting welding materials, Hastelloy C-276 processed parts, etc.
