STAINLESS STEELS

Stainless 304 Stainless 316

This is material with a chrome content >10.5% and carbon <1.2%, elements needed to create, in contact with the oxygen present in the atmosphere or in water, a corrosion-resistant layer (layer known as passive), from which its stainless qualities derive.

Steels types:

  • Stainless / aisi 304;
  • Stainless / aisi 304l;
  • Stainless / aisi 310;
  • Stainless / aisi 316;
  • Stainless / aisi 316l;
  • Stainless / aisi 321.

STAINLESS STEEL USES

Type Properties
AISI 304 Known as 18-10. Good resistance to corrosion. General uses (metal structural work, chemical industry, pharmaceuticals, foods, and boiler making).
AISI 304L Steel with low carbon content. It has excellent resistance to intergranular corrosion which is maintained even after welding, without the need for solubilisation treatments. It is excellent for use in welded constructions with a good ability to be deep drawn and easily polished. It is used in the food industry, textiles, paper, etc.
AISI 310 Steel with excellent thermo-mechanical resistance. It is well able to withstand continued temperature changes, even with significant, sudden changes in thermal gradient. Its limits to use are 1050°C in an oxidising atmosphere, 950°C in a sulphurous or reducing oxidising atmosphere, 750°C in sulphurous reducing atmosphere.
AISI 316 The presence of molybdenum increases corrosion resistance to sulphur solutions, organic foods, chlorides, etc. Widely used in the chemical, textile and pharmaceuticals industries.
AISI 316L Steel similar to AISI 316 but with a higher Mo content to allow use in serious corrosion conditions such as in presence of sulphuric acid solutions with concentration levels under 10% or above 80% ambient temperature. It polishes to excellent shine and requires no solubilisation after welding.
AISI 321 Titanium-stabilised steel that is non-sensitive to intergranular corrosion after welding. It has notable resistance to corrosion, is easily welded and can even be used at temperatures within a range of 700-800°C. Up to temperatures of 200-300°C its mechanical characteristics are practically unchanged. The polished finish is mediocre due to the presence of titanium.