Stainless steel iron contains chromium but no nickel, also known as Cr stainless steel, which has certain corrosion resistance. Stainless iron is commonly known as ferromagnetic stainless steel, which mainly refers to 1Cr 17 (ferrite) series and 1Cr 13 (martensite) series, but Fe has no ferromagnetism when it exists in austenite form.

It is easy to misunderstand to distinguish Ni/Cr, although they lead to isomorphism of Fe, in which Fe and Ni are ferromagnetic and Cr is paramagnetic. Many high-performance soft magnetic materials 1J series are nickel-based.

Extended data 1, mechanical properties of stainless steel

Austenitic iron plates have the best comprehensive properties, such as sufficient strength, excellent plasticity and low hardness, which is one of the reasons why they are widely used.

Austenitic stainless steel is similar to most other metal materials, and its tensile strength, yield strength and hardness increase with the decrease of temperature. Plasticity decreases with the decrease of temperature.

Its tensile strength increases uniformly in the temperature range of 15 ~ 80℃. More importantly, with the decrease of temperature, the impact toughness decreases slowly, and there is no ductile-brittle transition temperature. Therefore, stainless steel can maintain sufficient plasticity and toughness at low temperature.

2. Heat resistance of stainless steel

Heat resistance refers to both oxidation resistance and gas medium corrosion resistance at high temperature, that is, thermal stability, and sufficient strength, that is, thermal strength.

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