MONEL400 material grades, standards and characteristics introduction

MONEL400 material grades, standards and characteristics
MONEL400 international name: MONEL alloy400, UNS N04400, NiCu30Fe, W-Nr: 2.4360, Nicorros-alloy400, ATI400, NAS NW400, Ni68Cu28Fe, NS 6400;
MONEL400 implementation standards: ASTM B127/ASME SB-127, ASTM B163/ASME SB-163, ASTM B165/ASME SB-165
MONEL400 main components: carbon (C) ≤ 0.30, nickel (Ni) ≥ 63.0, silicon (Si) ≤ 0.5, sulfur (S) ≤ 0.024, iron (Fe) ≤ 2.5, manganese (Al) ≤ 2.0, copper (Cu) 28.0 ~ 34.0
MONEL400 physical properties: density: 8.9g/cm3, melting point: 1300-1350 ℃, magnetism: none
MONEL400 mechanical properties: tensile strength: σb≥480Mpa, yield strength σb≥195Mpa: elongation: δ≥35%, hardness: HB135-179
MONEL400 corrosion resistance and main use environment:
Monel400's corrosion resistance is generally better than nickel copper. It is more resistant to reducing media than pure nickel and oxidizing media than pure copper. It has very good corrosion resistance to sulfuric acid, phosphoric acid and carbon. It is especially resistant to hydrochloric acid corrosion and has excellent corrosion resistance to hot concentrated alkali. Monel400 alloy has excellent corrosion resistance in fluorine gas, hydrochloric acid, sulfuric acid, hydrofluoric acid and their derivatives. At the same time, it is more corrosion resistant than copper-based alloys in seawater.
Monel400 is a deformable nickel-copper nickel-based alloy with excellent seawater corrosion resistance and chemical corrosion resistance, and strong resistance to chloride stress corrosion cracking. This alloy is one of the few alloys that can be used in fluorides. It has excellent resistance to oxide stress cracking corrosion in hydrofluoric acid and fluorine gas media, such as seawater and salt water environments.
Monel 400 also has very good corrosion resistance in alkaline and salt solutions of moderate concentration.
In a colder alkaline environment, the alloy is used in weak acids such as sulfur and hydrogen fluoride.
Acid medium: Monel400 is corrosion-resistant in sulfuric acid with a concentration of less than 85%. Monel400 is one of the very few important materials that can resist hydrofluoric acid.
Water corrosion: In most water corrosion conditions, Monel400 alloy not only has excellent corrosion resistance, but also rarely suffers from pitting corrosion and stress corrosion, and the corrosion rate is less than 0.025mm/a.
High temperature corrosion: The maximum temperature at which Monel400 can work continuously in air is generally around 600℃, and in high-temperature steam, the corrosion rate is less than 0.026mm/a. Ammonia: Due to the high nickel content of Monel400 alloy, it can resist corrosion under anhydrous ammonia and ammoniation conditions below 585℃.