Stainless steel coil is a corrosion-resistant alloy coil based on Fe-chromium alloy (chromium content ≥10.5%), adding nickel, molybdenum, manganese and other elements. Its core properties come from the passivation film formed by chromium oxidation, which can resist oxidation, acid base and high temperature corrosion. According to the difference of microstructure and composition, it is divided into austenite, ferrite, martensite and other series.

Manufacturing Process

● Smelting

 (EAF) or (AOD) smelting, precise control of carbon content (≤0.08%)

Add alloying elements (such as Ni, Mo) and vacuum degassing (VD) to reduce impurities (S≤0.03%, P≤0.045%)

● Continuous Casting & Hot Rolling

Slab casting, hot rolled to 2.0-12.7mm thick (hot rolled coil)

● Annealing & Pickling

Austenitic steel: 1050-1150℃ solution treatment, water quenching (eliminate carbide precipitation)

Ferritic steel: annealed at 800-900℃, air-cooled

Pickling of nitric acid-hydrofluoric acid mixture to remove the oxide (surface Ra≤0.6μm)

● Cold Rolling

Rolled to 0.1-6.0mm thickness (accuracy ±0.02mm), with bright annealing (BA) or wire drawing (HL) treatment

Product classification

Product advantage

1.Corrosion Resistance

304: Resistant to atmosphere, fresh water and weak acid and alkali (pH 3-11)

316: Resistance to seawater, chloride and sulfuric acid

430: Resistance to nitric acid and organic acids

2.High-Temperature Performance

Austenitic steel: continuous use temperature ≤870℃ (304), strong oxidation resistance

Ferritic steel: resistant to high temperature vulcanization (430 for automotive exhaust pipes)

3.Hygiene

Surface finish Ra≤0.8μm, in line with FDA food contact standard (21 CFR 175.300)

4.Recyclability

100% recyclable with 60% lower carbon emissions than carbon steel (life cycle assessment)

Application field

Product data