Cause analysis of unqualified hardness of 14Cr17Ni2 stainless steel blade

doi:10.13251/j.issn.0254-6051.2020.07.044

Abstract

Abstract: Rods and blades of 14Cr17Ni2 stainless steel were investigated by direct reading spectrometer, optical microscope and hardness tester. Meanwhile, their chemical compositions, high magnification observation of microstructure, hardness were analyzed after different heat treatments. the reasons for unqualified hardness were discussed in combination with the manufacturing process of the blade, and the improvement measures were thus proposed. The results show that the high temperature in the process of hot working and heat treatment for steel rods leads to the increase of the content of ferrite in blades, which is the direct cause of the unqualified hardness of blades after heat treatment. By adjusting the composition of steel, properly increasing the value of nickel equivalent, and reasonably controlling the hot working and heat treatment process of the steel billets and blades, the required hardness of the blades is realized.

Key words: 14Cr17Ni2 stainless steel, blade, hardness, ferrite

CLC Number:

TG142

Li Li, Zhang Quanxin, Zhu Bin. Cause analysis of unqualified hardness of 14Cr17Ni2 stainless steel blade[J]. Heat Treatment of Metals, 2020, 45(7): 214-218.

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