Several common classifications of stainless steel

Stainless steel products are very common in life, but it is not a simple matter to be able to distinguish what kind of stainless steel it is. Here are some common stainless steel materials:

Austenitic stainless steel

The matrix is ​​mainly composed of an austenitic structure (γ phase) with a face-centered cubic structure, which is non-magnetic and is mainly strengthened by cold working (and may result in a certain magnetic property).

Austenitic-ferritic (duplex) stainless steel

The matrix has both austenite and ferrite two-phase structure (where the content of the lesser phase is generally greater than 15%) and is magnetic and can be strengthened by cold working.

Ferritic stainless steel

The matrix is ​​dominated by the ferrite structure (alpha phase) of the body-centered cubic crystal structure, is magnetic, and generally cannot be hardened by heat treatment, but it can be slightly strengthened by cold working.

Martensitic stainless steel

The matrix is ​​martensitic, magnetic, and can be adjusted to its mechanical properties by heat treatment.

Precipitation hardened stainless steel

The matrix is ​​austenitic or martensitic and can be hardened (strongly strengthened) by precipitation hardening (also known as age hardening).

Stainless steel 1Cr18Ni9Ti 0Cr18Ni9 00Cr19Ni10 0Cr17Ni12Mo2Ti 00Cr17Ni14Mo2 304 304L 316 316L

Standard national standards for stainless steel pipe fittings:

Standard number description

Japanese Standard for Pipeline Implementation Standards: Standard Number Description

JIS B2311 Universal Steel Butt Welded Pipe Fittings

JIS B2312 steel butt welding fittings

JIS B2313 butt welded pipe fittings for steel plate

Stainless steel elbow JIS B2316 steel socket welded pipe fittings



GB12459 steel butt welding seamless pipe fittings

GB/T13401 butt welded pipe fittings

GB/T14383 forged steel socket welded pipe fittings

GB/T14626 forged steel threaded fittings

GB9112-9131 steel pipe flange, flange cover and flange gasket