Stainless steel: The hardness of stainless steel usually reaches HRC56-58. Different types have different hardness.
Commonly used hardness indexes include Brinell hardness, Rockwell hardness and Vickers hardness.
Brinell hardness (? HB？ ): with a certain load (? General? 3000kg？ )? , put a certain size (diameter is generally? 10mm？ Press the hardened steel ball into the surface of the material and keep it for a period of time. After unloading, the ratio of load to indentation area is the Brinell hardness value. (HB)？ , in kilograms? /mm2？ (Newton/mm2).
2. Rockwell hardness (HR): When? HB & gt450? Or if the sample is too small for Brinell hardness test, Rockwell hardness measurement can be used instead. Does it use a vertex angle of 120? A diamond cone with a diameter of 1.59? 、? 3? . 18mm？ Press the steel ball into the surface of the measured material under a certain load, and calculate the hardness of the material from the indentation depth. According to hardness, it can be divided into three types:
( 1)HRA？ : Is it adopted? 60kg？ The hardness obtained by load and diamond cone pressure is used for extremely hard materials (such as cemented carbide, etc.). ).
②HRB？ : Is it adopted? 100kg？ Load and diameter? 1.58mm？ Harden the steel ball to obtain hardness, which is used for materials with low hardness (such as annealed steel and cast iron). ).
(3)HRC？ : Is it adopted? 150kg？ The hardness obtained by load and diamond cone pressure is used for high hardness materials (such as hardened steel, etc.). ).
3. Vickers hardness (HV): 120kg? Internal load and vertex angle are 136? A diamond square cone indenter of 0 is pressed into the surface of the material, and the Vickers hardness is obtained by dividing the surface area of the indentation pit by the load value. (HV)？ .