Heat treatment technique for improving hardness of 05Cr17Ni4Cu4Nb steel part
A technology of 05cr17ni4cu4nb and process method, which is applied in the field of heat treatment of high-strength parts, can solve the problems of extending the solution heating time, the hardness cannot meet the design requirements of the drawings, etc., and achieve the effect of extending the solution heating time.
Inactive Publication Date: 2015-06-10
中船重工西安东仪科工集团有限公司
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[0004] In order to improve the heat treatment processing quality of 05Cr17Ni4Cu4Nb steel gears and solve the problem that the hardness of the gear parts cannot meet the design requirements of the drawings when the gear parts are treated according to the general standard heat treatment process in this field, the applicant made a breakthrough in the technical field by heat treatment of 05Cr17Ni4Cu4Nb steel. Intrinsic method, a new heat treatment method is proposed, adding ice cooling treatment after solid solution, and prolonging the solution heating time at the same time
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[0017] Describe the present invention below in conjunction with specific embodiment:
[0018] In this embodiment, the gear of a certain product is to be processed. The drawing design requirements: material 05Cr17Ni4Cu4Nb, supply status: hot rolling, specification: Φ20X400, heat treatment requirements HRC48-52. Due to the use of standard heat treatment methods for multiple process tests and constant adjustment of process parameters, the Rockwell hardness of gear parts is only HRC42-45 in the experimental results, which cannot reach the Rockwell hardness HRC48-52 required by the drawing design. Therefore, the use of existing standard heat treatment The process method is used to analyze the metallographic structure of solid solution and aging parts:
[0019] figure 1 The metallographic structure of the medium cross-section shows tempered martensite + a small amount of bainite + granular δ-ferrite, figure 2 The metallographic structure of the middle longitudinal section shows t...
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The invention provides a heat treatment technique for improving hardness of a 05Cr17Ni4Cu4Nb steel part. The hardness of the 05Cr17Ni4Cu4Nb steel part can reach at least HRC48. The heat treatment technique comprises the following specific methods: salt bath heating, water-cooling quenching and solid dissolution, cold cryogenic treatment, machining molding and ageing. According to the method, ferrite and bainite in a steel structure can be transformed into austenite as much as possible by prolonging the solid solution and heat preservation time; the cold cryogenic treatment process is added; and the retained austenite is transformed into martensite as far as possible to obtain relatively high hardness while ageing, so that the problem that the Rockwell hardness of the 05Cr17Ni4Cu4Nb steel cannot easily reach the technical requirements of HRC48-52 according to the specification of the prior art is solved.
Description
technical field [0001] The invention belongs to the technical field of heat treatment technology, in particular to a heat treatment method for high-strength parts made of 05Cr17Ni4Cu4Nb steel. Background technique [0002] 05Cr17Ni4Cu4Nb steel belongs to precipitation hardening stainless steel. According to the mechanical properties of GB / T1220-2007 stainless steel rod table 10 precipitation hardening stainless steel rod and table A5 standard heat treatment system of precipitation hardening stainless steel rod, 05Cr17Ni4Cu4Nb steel is (1020-1060) ℃ fast After cold solid solution and aging at 480°C (470°C-490°C), its hardness can reach Brinell hardness HBW≥375, Rockwell hardness HRC≥40, and some materials introduce that the material is solid solution + 480°C aging limit The hardness value can reach about HRC45. If you want to increase the hardness to Rockwell hardness HRC≥48 through heat treatment, after many process tests, it is difficult to achieve it with the existing sta...
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Login to View More IPC IPC(8): C21D1/00C21D6/00
CPCC21D6/004C21D6/04C21D2211/008
Inventor 冯小林张溦高文涛李党军李铁麟吕耀斌党平
Owner 中船重工西安东仪科工集团有限公司