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Cr13型不锈钢是马氏体型不锈钢,其中铬的含量在12～14％,含碳量0.1～0.45％。这类不锈钢随着碳含量的增加,其硬度和强度也增加,而耐腐性却有所降低。用这类钢制作的小型精密零件,如要求淬火后有一定的强度和硬度、较小的变形(淬火后不易校正的)及光亮的表面,用一般箱式炉或盐浴炉加热淬火很难达到要求。我厂继电器中一根装游丝的不锈钢小轴,其外形滚花,两轴尖与外圆的同心度偏差小于0.12毫米、硬度HRC47～51,淬火后除了研磨R0.05处外别处不能加工。该零件我厂采用简易真空炉淬火、满足了技术要求。
Cr13 stainless steel is martensitic stainless steel, of which chromium content of 12 to 14%, carbon content of 0.1 to 0.45%. Such stainless steel with the carbon content increases, the hardness and strength also increased corrosion resistance decreased. Small precision parts made of this type of steel, such as requiring a certain strength and hardness after quenching, small deformation (not easily corrected after quenching) and shiny surface, with a general box furnace or salt bath furnace quenching is difficult Meet the requirements. I plant a relay installed in a spring wire stainless steel small axis, the shape of knurled, two-axis tip and the concentricity deviation of less than 0.12 mm, hardness HRC47 ~ 51, except after grinding R0.05 at other parts of the outside can not be processed. The parts of our factory using a simple vacuum furnace quenching to meet the technical requirements.