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Production method of high-carbon martensitic stainless steel steckel mill

A technology of carbon martensitic and steckel rolling mills, applied in metal rolling, metal rolling, workpiece surface treatment equipment, etc., can solve the problem that the hardness of low-carbon stainless steel cannot satisfy high-end users, affect the surface quality and yield of strip steel, The long production time of the steckel rolling mill can improve the surface roughness and peeling defects, improve the surface quality and increase the temperature

Active Publication Date: 2021-07-27
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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Problems solved by technology

[0002] At present, Cr13 type martensitic stainless steel is the most used in the manufacture of knives, such as 20Cr13, 30Cr13, 40Cr13, etc. These steel types have higher hardness, such as 20Cr13 after heat treatment, the hardness can reach HRC48-52, 30Cr13, 40Cr13 hardness It can reach above HRC53. With the increase of users' demand for hardness, the hardness of low-carbon stainless steel cannot meet the needs of high-end users
As high-end 50Cr15MoV, 50Cr13, 60Cr13 have high carbon content, due to the high carbon content, the production time of the steckel mill is relatively long, and the requirements for equipment status and process parameters are relatively high in the production process, and a slight deviation in control will lead to decarburization and peeling , edge cracks, delamination and other defects seriously affect the strip surface quality and yield

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with specific embodiment:

[0023] A kind of production method of high-carbon martensitic stainless steel steckel rolling mill, described technology comprises the following steps:

[0024] 1) Heating: The slab is heated by preheating and heating in series. The tapping temperature of the preheating furnace is 695-705°C, the heating time is 230-250min, and the heating rate is 2.5±0.2°C / min; the tapping temperature of the heating furnace is 1250-1270°C ℃, the heating time is 220~240min, the heating rate is 2.4±0.2℃ / min; the residual oxygen in the furnace is controlled to be 1.0~1.5%. The main purpose of adopting the preheating and heating series mode is to prolong the time in the furnace, so that the central segregation in the slab can be fully diffused, so as to achieve the purpose of controlling stratification. The martensitic slab has poor thermal conductivity, and the heating rate is controlled to pr...

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Abstract

The invention discloses a production method of a high-carbon martensitic stainless steel steckel mill, and relates to high-carbon steel produced by the steckel mill and a production process of the high-carbon steel. The process technology focuses on overcoming the defects of decarburization, peeling, edge cracking, layering and the like of high-carbon martensitic stainless steel, the defects of decarburization, peeling, edge cracking, layering and the like of the high-carbon martensitic stainless steel caused by long rolling time of the steckel mill are effectively overcome by controlling the tapping temperature, heating furnace residual oxygen, pass reduction, vertical roll rolling force, a descaling system and other processes, and the surface quality and the yield are improved.

Description

technical field [0001] The invention belongs to the technical field of plate processing, and in particular relates to a production method of a high-carbon martensitic stainless steel steckel rolling mill. Background technique [0002] At present, Cr13 type martensitic stainless steel is the most used in the manufacture of knives, such as 20Cr13, 30Cr13, 40Cr13, etc. These steel types have relatively high hardness. For example, the hardness of 20Cr13 after heat treatment can reach HRC48-52, and the hardness of 30Cr13 and 40Cr13 It can reach above HRC53. With the increase of users' demand for hardness, the hardness of low-carbon stainless steel cannot meet the needs of high-end users. As high-end 50Cr15MoV, 50Cr13, 60Cr13 have high carbon content, due to the high carbon content, the production time of the steckel mill is relatively long, and the requirements for equipment status and process parameters are relatively high in the production process, and a slight deviation in con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B5/00B21B45/06B21B37/28B21B37/48B21B37/74B21B45/00
CPCB21B5/00B21B45/06B21B37/28B21B37/48B21B37/74B21B45/004Y02P10/20
Inventor 纪显彬潘吉祥魏海霞李照国
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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