420 stainless steel is a kind of Martensitic stainless steel, with certain abrasion resistance and corrosion resistance, high hardness, suitable for all kinds of precision machinery, bearings, electrical, equipment, instruments, instruments, means of transportation, household appliances, etc. It is used to manufacture parts and components resistant to atmospheric, steam, water and oxidizing acid corrosion.

Chemical composition

Carbon C: 0.16 ~ 0.25

Manganese Mn: 1.00 or less

Si Si: 1.00 or less

Chromium Cr: 12.0 ~ 14.0

Ni Ni (2) : 0.75 or less

P P: 0.04 or less

S: sulfur 0.03 or less

Note: The single value is the highest unless otherwise indicated; (2) For some pipe making process, some models of austenitic stainless steel nickel content must be slightly higher than the value shown in the table; (3) random; The maximum Ta content is 0.10%; The highest content is 0.75%; Maximum content is 0.70%

Mechanical properties of

Tensile strength B (MPa) : Quenching and tempering,≥635

Conditional yield strength 0.2 (MPa) : quenching and tempering,≥440

Elongation 5 (%) : quenching tempering,≥20

Reduction of area bits (%) : quenching tempering, 50 or higher

Impact energy Akv (J) : quenching tempering,≥63

Hardness: annealing,≤223HB; Quenching and tempering ≥192HB

420 stainless steel tubes are a grade of stainless steel manufactured to American ASTM Standard (ASTM A276-2006 stainless steel bars and profiles)

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