The main difference between stainless steel elbow and carbon steel elbow lies in the material, and its chemical composition will make the elbow surface rust and corrode for a long time. Stainless steel is stainless. Corrosion resistance is the main feature, with chromium content of at least 10.5% and carbon content of no more than 1.2%. The matrix of austenitic stainless steel is mainly composed of austenite structure (γ phase) with face-centered cubic structure, which is non-magnetic, and is mainly strengthened by cold working (and may lead to certain magnetism). Austenite-ferrite (dual-phase) stainless steel matrix has both austenite and ferrite phases (the minority phase content is generally greater than 15%), which is magnetic and can be strengthened by cold working. Ferritic stainless steel matrix is mainly composed of ferrite structure (α phase) with body-centered cubic crystal structure, which is magnetic and can not be hardened by heat treatment generally, but can be strengthened slightly by cold working. Martensite stainless steel matrix is a martensite structure with magnetism, and its mechanical properties can be adjusted by heat treatment. The matrix of precipitation hardening stainless steel is austenite or martensite, which can be hardened (strengthened) by precipitation hardening (also called age hardening). Stainless steel18Ni9Ti0Cr18Ni90Cr19Ni100Cr17Ni12Mo2Ti00Cr17Ni. Implementation of national standards: standard number description GB 12459 seamless steel butt-welded pipe fittings GB/T 1340 1 steel butt-welded pipe fittings GB/T 14383 forged steel socket welded pipe fittings GB/ T 14626 forged steel threaded pipe fittings GB 9/kloc.

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