阅读说明：本技术 高强度热轧钢板的加热方法 (Method for heating high-strength hot-rolled steel sheet ) 是由 叶晓瑜 熊雪刚 王飞龙 汪创伟 张开华 于 2019-10-23 设计创作，主要内容包括：本发明涉及一种高强度热轧钢板的加热方法,属于热连轧板带生产技术领域。本发明在连铸生产热轧钢板时,连铸坯预热段温度≤1100℃,加热段温度1050℃～1290℃,均热段温度1220℃～1260℃,均热段时间≥40min,总在炉时间170min～320min；待轧保温≥60min时,预热段温度≤950℃,加热段温度1050℃～1150℃,均热段温度1130℃～1240℃。本发明通过热轧加热过程的控制,控制微合金元素的回溶以及原始奥氏体晶粒的尺寸,从而控制强度的稳定性,特别是在用于生产屈服强度600MPa级以上高强钢,金相结构为铁素体+珠光体的双相组织的高强钢时,效果尤为明显。(The invention relates to a heating method of high-strength hot-rolled steel plates, belonging to the technical field of hot continuous rolled plate strip production, when the hot-rolled steel plates are produced by continuous casting, the temperature of a preheating section of a continuous casting billet is less than or equal to 1100 ℃, the temperature of a heating section is 1050-1290 ℃, the temperature of a soaking section is 1220-1260 ℃, the time of the soaking section is more than or equal to 40min, the total furnace time is 170-320 min, when the rolling heat preservation is more than or equal to 60min, the temperature of the preheating section is less than or equal to 950 ℃, the temperature of the heating section is 1050-1150 ℃, and the temperature of the soaking section is 1130-1240 ℃.)

1. A method for heating a hot-rolled steel sheet, characterized by comprising: the temperature of the preheating section of the continuous casting billet is less than or equal to 1100 ℃, the temperature of the heating section is 1050-1290 ℃, the temperature of the soaking section is 1220-1260 ℃, the time of the soaking section is more than or equal to 40min, and the total in-furnace time is 170-320 min; when the rolling heat preservation is more than or equal to 60min, the temperature of the preheating section is less than or equal to 950 ℃, the temperature of the heating section is 1050-1150 ℃, and the temperature of the soaking section is 1130-1240 ℃.

2. The method of heating hot-rolled steel sheet according to claim 1, characterized by: the method is used for producing high-strength steel with yield strength of more than 600 MPa.

3. The method of heating hot rolled steel sheet according to claim 1 or 2, characterized in that: the metallographic structure of the steel used for production is a ferrite + pearlite dual-phase structure.

Technical Field

The invention relates to a heating method of high-strength hot-rolled steel plates, belongs to the technical field of hot continuous rolling strip production, and is particularly suitable for producing high-strength steel with yield strength of more than 600 MPa.

Background

Under the conditions of increasingly deficient energy and increasingly deteriorated environment, the development of energy-saving and low-emission automobile technology is a necessary way to reduce energy consumption and environmental pollution.

Therefore, in the fields of automobiles and engineering machinery, increasing strength to reduce weight is an effective measure for reducing fuel consumption. In the prior stage, the high-strength steel is mainly precipitated and strengthened, micro-alloy element redissolution and austenite growth processes exist in the hot rolling and heating process, austenite recrystallization and deformation induced phase change precipitation processes exist in the rolling process, and austenite-ferrite phase change and interphase precipitation processes exist in the laminar cooling process, so that the mechanical property difference of various parts at the middle edge, the middle head and the tail of the product is large, and the integral mechanical property is not stable enough.

Disclosure of Invention

The invention aims to solve the technical problem that the overall mechanical property of a product can be more stable by providing the heating method of hot rolled steel plates.

In order to solve the technical problems, the invention adopts the technical scheme that: the heating method of the hot rolled steel plate comprises the steps that the temperature of a preheating section of a continuous casting blank is less than or equal to 1100 ℃, the temperature of a heating section is 1050-1290 ℃, the temperature of a soaking section is 1220-1260 ℃, the time of the soaking section is more than or equal to 40min, and the total in-furnace time is 170-320 min; when the rolling heat preservation is more than or equal to 60min, the temperature of the preheating section is less than or equal to 950 ℃, the temperature of the heating section is 1050-1150 ℃, and the temperature of the soaking section is 1130-1240 ℃.

is used to produce high-strength steel with yield strength higher than 600 MPa.

, the metallurgical structure of the steel used for production is a ferrite + pearlite dual-phase structure.

The invention has the beneficial effects that: by controlling the hot rolling heating process, the redissolution of micro-alloy elements and the size of original austenite grains are controlled, so that the stability of the strength is controlled. The ferrite and pearlite dual-phase structure high-strength steel produced by the method has stable mechanical properties of the edges, the heads, the tails and the edges of the product, and has the characteristics of simple process control, strong adaptability, short production period, low cost and the like.

Detailed Description

The invention is further illustrated with reference to the following examples.

When the invention is used for producing hot rolled steel plates by continuous casting, the temperature of a preheating section of a continuous casting billet is less than or equal to 1100 ℃, the temperature of a heating section is 1050-1290 ℃, the temperature of a soaking section is 1220-1260 ℃, the time of the soaking section is more than or equal to 40min, and the total in-furnace time is 170-320 min; when the rolling heat preservation is more than or equal to 60min, the temperature of the preheating section is less than or equal to 950 ℃, the temperature of the heating section is 1050-1150 ℃, and the temperature of the soaking section is 1130-1240 ℃. The invention controls the redissolution of micro alloy elements and the size of original austenite grains by controlling the hot rolling heating process, thereby controlling the stability of strength, and particularly having obvious effect when being used for producing high-strength steel with yield strength of more than 600MPa and a dual-phase structure of ferrite and pearlite as a metallographic structure.