Ultrathin hot-rolled sheet strip with yield strength more than or equal to 500MPa level and manufacturing method thereof

A technology of yield strength and hot-rolled plate, applied in the field of hot-rolled steel plate and manufacturing, can solve the problems of process extension, high cost, and low yield, and achieve the effect of good plate shape, obvious cost advantage, and short process flow

Active Publication Date: 2014-08-20
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent has 0.25~0.80% Cr added, which is costly, adopts cold rolling production process, prolongs the process, and has a low yield

Method used

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  • Ultrathin hot-rolled sheet strip with yield strength more than or equal to 500MPa level and manufacturing method thereof
  • Ultrathin hot-rolled sheet strip with yield strength more than or equal to 500MPa level and manufacturing method thereof
  • Ultrathin hot-rolled sheet strip with yield strength more than or equal to 500MPa level and manufacturing method thereof

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Experimental program
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Effect test

Embodiment Construction

[0045] The present invention is described in detail below.

[0046] Each embodiment of the present invention is produced according to the following steps:

[0047] Hot metal desulfurization→converter blowing→argon blowing→LF furnace refining→continuous casting→rotary descaling→soaking furnace soaking→high pressure water descaling→7-stand finishing rolling→laminar cooling→coiling; and control the following parameters:

[0048] Two-stage liquid core pressing is adopted during continuous casting, and the thickness of the billet is reduced from 90~100mm to 50~55mm;

[0049] Control descaling high pressure water pressure to 30~38MPa;

[0050] The temperature of the soaking furnace is controlled at 1180~1250°C;

[0051] The pass reduction rate and rolling temperature of each pass of the 7-stand finish rolling are: F1: 50~60%, 1040~1080℃; F2: 50~60%, 1000~1050℃; F3: 40~50 %, 960~1030℃; F4: 40~50%, 940~990℃; F5: 25~35%, 930~980℃; F6: 20~35%, 890~960℃; F7: 10~20%, 870~930℃;

[005...

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Abstract

An ultra-thin hot-rolled strip with yield strength ≥ 500MPa, the chemical composition and weight percentage of which are: C: 0.02-0.07%; Si: ≤0.50%; Mn: 0.50-1.40%; P: ≤0.030%; S: ≤0.010%; Ti: 0.03~0.11%; Als: 0.01~0.20%; N: ≤0.005%; O: ≤0.004% or the chemical composition and weight percentage content is C: 0.17~0.20%; Si: ≤0.50 %; Mn: 0.50~0.90%; P: ≤0.030%; S: ≤0.010%; Ti: 0.03~0.08%; Als: 0.01~0.20%; N: ≤0.005%; O: ≤0.004%; Desulfurization → converter blowing → argon blowing → LF furnace refining → continuous casting → rotary descaling → soaking furnace soaking → descaling → 7-stand finishing rolling → laminar cooling → coiling. The invention not only has less addition of alloy elements, but also has mechanical properties of yield strength ≥ 500 MPa, product thickness ≤ 1.4 mm, good plate shape, short production process, and good cold forming and welding properties.

Description

technical field [0001] The present invention relates to a hot-rolled steel plate and a manufacturing method, in particular to an ultra-thin hot-rolled strip with a yield strength ≥ 500 MPa and a manufacturing method thereof, which is suitable for manufacturing trucks, special containers, and car parts, and the thickness specification does not exceed 1.4mm steel plate. Background technique [0002] With the development of the economy, the dependence on oil is becoming more and more serious, and the awareness of environmental protection is also increasing. Under this trend, many industries have the requirement of "replacing thickness with thinness" for structural parts, and at the same time hope to replace cold-rolled materials with relatively cheap hot-rolled materials "replacing cold with heat". Especially in the fields of trucks, special containers, car parts, etc., the demand for high-strength ultra-thin hot-rolled materials is increasing day by day. These users expect t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C22C33/04C21D8/02
Inventor 梁文陈吉清张永锟刘志勇谭佳梅刘昌明张超陶军晖李宇兴
Owner 武汉钢铁有限公司
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