5 princípios básicos do aço inoxidável 316L

5 Basics of 316L Stainless Steel

1. Chemical composition of 316L stainless steel

  • C: ≤ 0.03%;
  • Si: ≤ 0.75%;
  • Mn: ≤ 2.00%;
  • S: ≤ 0.030%;
  • P: ≤ 0.045%;
  • Cr: 16.00~18.0%;
  • Ni: 10.00-14.00%;
  • Mo: 2.00~3.00%;
  • N: 0.10%.

2. Features of 316L stainless steel

316L stainless steel is widely used in the chemical industry due to its excellent corrosion resistance.

316L is also a type of 18-8 austenitic stainless steel, with 2-3% Mo added.

The Mo content of 316L makes the steel have excellent corrosion resistance and can be used safely in environments containing Cl – and other halogen ions.

3. Use of 316L stainless steel

Pulp and paper manufacturing equipment, heat exchangers, dyeing equipment, pipes, building exterior materials in coastal areas, solenoid valve field, etc.

4. Causes of stainless steel corrosion

Pitting corrosion of stainless steel mainly occurs in environments containing iodine, chlorine, Australia and other aqueous solutions.

The reason for pitting corrosion of stainless steel is that hydrogen ions are active anions, which are easy to be adsorbed, compressing oxygen atoms, reacting with cations in the passivation film to generate soluble chlorides, damaging the passivation film, forming holes, forming a corrosion induction stage, in which a blocking circuit is formed and current corrosion occurs.

5. Measures to prevent corrosion of stainless steel

1) Choose Yidang stainless steel material in the environment where pitting corrosion is known.

Experiments show that stainless steel with higher molybdenum (Mo) or manganese (Mn) content has greater resistance to pitting corrosion.

2) Control the pH, chloride concentration and temperature of the liquid in contact with the stainless steel.

3) Cathodic protection, anodic protection or both

4) Try to use better quality stainless steel such as 316L to improve the corrosion resistance of stainless steel products.

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