Continuous annealing process of cold rolling low alloy high-strength steel plate with yield strength at grade of 420 MPa

A technology of yield strength and annealing process, which is applied in the field of continuous annealing process, can solve the problems of high energy consumption, achieve the effects of reducing energy consumption, shortening heating, and reducing production costs

Active Publication Date: 2013-08-28
SHANGHAI BAOYI CAN MAKING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For cold-rolled low-alloy high-strength steel sheets, continuous annealing is one of the key links in the production process, but the process consumes a lot of energy

Method used

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  • Continuous annealing process of cold rolling low alloy high-strength steel plate with yield strength at grade of 420 MPa
  • Continuous annealing process of cold rolling low alloy high-strength steel plate with yield strength at grade of 420 MPa
  • Continuous annealing process of cold rolling low alloy high-strength steel plate with yield strength at grade of 420 MPa

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Heat the cold-rolled low-alloy high-strength steel plate of the present invention with a yield strength of 420MPa from room temperature at a rate of 15°C / s to 630°C, then at a rate of 125°C / s to 790°C, soak for 100s, and then heat at a rate of 5°C / s Cool to 620°C at a rate of 20°C / s, then cool to 290°C at a rate of 20°C / s, and finally cool to room temperature with water.

Embodiment 2

[0030] see figure 2 , heating the cold-rolled low-alloy high-strength steel plate of the present invention with a yield strength of 420 MPa from room temperature at a rate of 20 °C / s to 650 °C, then heating at a rate of 150 °C / s to 800 °C, soaking for 70 seconds, and then heating at a rate of 10 °C / s s rate to 600°C, then cooled to 270°C at a rate of 25°C / s, and finally cooled to room temperature with water.

Embodiment 3

[0032] Heat the cold-rolled low-alloy high-strength steel plate of the present invention with a yield strength of 420MPa from room temperature at a rate of 25°C / s to 670°C, then at a rate of 175°C / s to 810°C, soak for 40s, and then heat at a rate of 15°C / s Cool to 580°C at a rate of 30°C / s, then cool to 250°C at a rate of 30°C / s, and finally cool to room temperature with water.

[0033] Table 1 Experimental results of mechanical properties

[0034]

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Abstract

The invention relates to a continuous annealing process of a cold rolling low alloy high-strength steel plate with yield strength at grade of 420 MPa. The variety of steel comprises chemical components of, by mass percent, C<=0.1%, Mn<=1.6%, Si<=0.5%, P<=0.025%, S<=0.025%, Alt<=0.015, Ti<=0.15%, Nb<=0.09% and the balance of Fe. A cold rolling reduction is controlled at 60-70%. The steel plate is heated with a rate of 20+ / -5 DEG C / s from a room temperature to 650 + / - 20 DEG C, then heated to 800+ / -10 DEG C with a rate of 150+ / -25 DEG C / s, treated with soaking for 40-100 s, then cooled to 600+ / -20 DEG C with a rate of 10+ / -5 DEG C / s, then cooled to 270+ / -20 DEG C with a rate of 25+ / -5 DEG C / s and finally cooled to the room temperature in water. The continuous annealing steel plate produced by the invention has shortened annealing time and reduced energy consumption, with mechanical properties maintained practically the same.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of metal materials, and relates to a continuous annealing process for cold-rolled low-alloy high-strength steel plates with a yield strength of 420 MPa. Background technique [0002] Low-alloy high-strength steel is a series of steel grades developed and formed in the past 30 years. This type of steel is strengthened by adding microalloying elements such as niobium, titanium, vanadium, etc. to low carbon steel alone or in combination to form carbonitride particles for precipitation, and at the same time obtains higher strength through the grain refinement of microalloying elements. With the rapid development of the automobile and home appliance industries, at present, cold-rolled low-alloy high-strength steels of different strength levels have been developed according to the alloy composition of this type of steel. [0003] Most domestic steel mills mainly use continuous annealing for heat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/46C21D1/26C21D11/00C22C38/14
Inventor 郭文渊张清
Owner SHANGHAI BAOYI CAN MAKING CO LTD
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