CN-118086649-B - Hot-rolled high-carbon steel and preparation method thereof

CN118086649BCN 118086649 BCN118086649 BCN 118086649BCN-118086649-B

Abstract

The application relates to the technical field of hot-rolled high-carbon steel, in particular to hot-rolled high-carbon steel and a preparation method thereof. The method comprises the steps of heating a plate blank by adopting a reducing atmosphere, controlling the heating initial temperature of the plate blank, rolling the heated plate blank, controlling the rolling process parameters to obtain hot rolled strip steel, performing laminar cooling on the hot rolled strip steel by adopting a sparse cooling mode, coiling and controlling the coiling process parameters to obtain a hot rolled coil, performing heat preservation treatment on the hot rolled coil, and controlling the time for the hot rolled coil to enter the heat preservation treatment after being taken off line to obtain hot rolled high-carbon steel. The application solves the technical problem that the existing hot rolled high-carbon steel is easy to crack.

Inventors

LIANG JIANGTAO
LV BO
MIAO CHENGLIANG
CHENG YANG
HAN BIN
TIAN ZHIHONG
WANG SONGTAO
ZHU GUOSEN
YU MENG
XU HAIWEI
PAN YUNLONG
Liu Gun
TENG WENJUAN
WEI JIANBO
LI RUI
LI YUE
GAO WENGANG
LIU SHUNMING
LI XIAOLIN
XIAO BAOLIANG

Assignees

首钢集团有限公司

Dates

Publication Date: 20260512
Application Date: 20240327

Claims (2)

1. A method of producing hot rolled high carbon steel, the method comprising: heating the plate blank by adopting a reducing atmosphere, and controlling the initial heating temperature of the plate blank to be more than 400 ℃; The heated plate blank is rolled, and the rolling technological parameters are controlled to obtain hot rolled strip steel, wherein the rolling comprises rough rolling and finish rolling, and the water consumption mode of finish rolling is that side water spraying, reverse water spraying and cooling water between frames are closed, the descaling pressure of rough rolling is 20-24MPa, and the descaling pressure of finish rolling is 29-32MPa; Performing laminar cooling on the hot rolled strip steel by adopting a sparse cooling mode, coiling, and controlling the coiling technological parameters to obtain a hot rolled coil; Performing heat preservation treatment on the hot rolled coil, and controlling the time for the hot rolled coil to enter the heat preservation treatment after being taken off, so as to obtain hot rolled high carbon steel, wherein the time for the hot rolled coil to enter the heat preservation treatment after being taken off is less than or equal to 30min, and the heat preservation time is more than or equal to 48h; The coiling process parameters comprise coiling temperature, coiling tension and coiling water mode; the coiling temperature comprises the middle coiling temperature of the hot rolled strip steel, the first head coiling temperature of the hot rolled strip steel and the tail coiling temperature of the hot rolled strip steel; The middle coiling temperature of the hot rolled strip steel, and the first head coiling temperature of the hot rolled strip and the tail coiling temperature of the hot rolled strip satisfy the following relation: T Head and tail —T In (a) =20-100°C; Wherein T In (a) represents the middle coiling temperature of the hot rolled strip steel, T Head and tail represents the first head coiling temperature of the hot rolled strip steel and the tail coiling temperature of the hot rolled strip steel, and the lengths of the first head of the hot rolled strip steel and the tail of the hot rolled strip steel are 10-60m; The coiling tension comprises a second head coiling tension of the hot rolled strip steel, The head coiling tension of the hot rolled strip steel is less than 35MPa, and the length of the second head of the hot rolled strip steel is 30-100m; The coiling water mode comprises a third head coiling water mode of hot rolled strip steel, The water mode for coiling the third head of the hot rolled strip steel is that coiling cooling water is closed, and the length of the third head of the hot rolled strip steel is 30-100m.
2. A hot rolled high carbon steel prepared by the method of claim 1.

Description

Hot-rolled high-carbon steel and preparation method thereof Technical Field The application relates to the technical field of hot-rolled high-carbon steel, in particular to hot-rolled high-carbon steel and a preparation method thereof. Background The high-carbon steel is a steel grade with carbon content higher than 0.6%, belongs to a steel grade with high added value and high technical threshold, is mainly applied to the field with higher requirements on wear resistance, such as parts of cutters, saw blades, spinning needles and the like, and has long been monopolyed by China and other countries. The high carbon steel has a hot rolled state and a cold rolled annealed state when applied. The hot rolled high carbon steel is mainly concentrated on thick products and is mainly applied to the fields of saw blades and the like. The cold-rolled annealed product is mainly applied to relatively precise industries, and has higher requirements on the original structure of the steel plate and the dimensional accuracy of the product. Both the hot rolled product and the cold rolled annealed product are subjected to a hot rolling step. However, compared with medium-low carbon steel, high-carbon steel has higher carbon content, and the steel has good hardenability, but is easy to generate uneven cooling in a hot rolling link, easy to generate microcracks in a steel strip, and has the risk of strip breakage in links such as hot rolling, leveling, acid washing and the like. Disclosure of Invention The application provides hot-rolled high-carbon steel and a preparation method thereof, which aim to solve the technical problem that the existing hot-rolled high-carbon steel is easy to crack. In a first aspect, the present application provides a method for producing hot rolled high carbon steel, the method comprising: Heating the plate blank by adopting a reducing atmosphere, and controlling the heating initial temperature of the plate blank; Rolling the heated plate blank, and controlling the rolling process parameters to obtain hot rolled strip steel, wherein the rolling comprises rough rolling and finish rolling; Performing laminar cooling on the hot rolled strip steel by adopting a sparse cooling mode, coiling, and controlling the coiling technological parameters to obtain a hot rolled coil; and carrying out heat preservation treatment on the hot rolled coil, and controlling the time for the hot rolled coil to enter the heat preservation treatment after being taken off, so as to obtain the hot rolled high-carbon steel. Optionally, the technological parameters of coiling comprise coiling temperature, coiling tension and coiling water mode. Optionally, the coiling temperature comprises the middle coiling temperature of the hot rolled strip steel, the first head coiling temperature of the hot rolled strip steel and the tail coiling temperature of the hot rolled strip steel; The middle coiling temperature of the hot rolled strip steel, and the first head coiling temperature of the hot rolled strip and the tail coiling temperature of the hot rolled strip satisfy the following relation: T Head and tail —T In (a) =20-100°C Wherein T In (a) represents the middle coiling temperature of the hot rolled strip, and T Head and tail represents the first head coiling temperature and the tail coiling temperature of the hot rolled strip; wherein the lengths of the first head part of the hot rolled strip steel and the tail part of the hot rolled strip steel are 10-60m. Optionally, the coiling tension comprises a second head coiling tension of the hot rolled strip steel, wherein the head coiling tension of the hot rolled strip steel is less than 35MPa; Wherein the length of the second head part of the hot rolled strip steel is 30-100m. Optionally, the coiling water mode comprises a third head coiling water mode of the hot rolled strip steel, wherein the third head coiling water mode of the hot rolled strip steel is to turn off coiling cooling water; Wherein the length of the third head part of the hot rolled strip steel is 30-100m. Optionally, the time for the hot rolled coil to enter the heat preservation treatment after being taken off is less than or equal to 30 minutes. Optionally, the rolling process parameters comprise a finish rolling water consumption mode, wherein the finish rolling water consumption mode comprises closing side water spraying, reverse water spraying and inter-frame cooling water. Optionally, the rolling process parameters further comprise a descaling pressure, wherein the descaling pressure comprises a descaling pressure of rough rolling and a descaling pressure of finish rolling, The descaling pressure of the rough rolling is 20-24MPa, and the descaling pressure of the finish rolling is 29-32MPa. Optionally, the initial heating temperature of the slab is greater than 400 ℃. In a second aspect, the present application provides a hot rolled high carbon steel prepared by the method of any one of the embodiments of th