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Hot rolling steel plate with characteristic of multiple grades in one steel, and manufacturing method thereof

A technology for hot-rolled steel sheets and steel sheets, which is applied in the field of hot-rolled steel sheets and their manufacturing, can solve the problems of various component systems and complex processes, and achieve the effects of reducing production costs, low costs, and expanding the variety of hot-rolled products.

Active Publication Date: 2015-07-15
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problems existing in the prior art, the present invention provides a one-steel multi-stage hot-rolled steel plate and its manufacturing method, the purpose of which is to provide a slab with simple composition and be able to realize the production of one-component slab to meet the performance of various parts of automobiles The required steel plate, that is, a multi-level technical solution for one steel, solves the problems of various component systems and complicated processes in existing steel for automotive structures

Method used

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  • Hot rolling steel plate with characteristic of multiple grades in one steel, and manufacturing method thereof
  • Hot rolling steel plate with characteristic of multiple grades in one steel, and manufacturing method thereof
  • Hot rolling steel plate with characteristic of multiple grades in one steel, and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A steel multi-grade hot-rolled steel plate, the chemical composition is: 0.08%C, 0.15%Si, 1.50%Mn, 0.02%Nb, 0.01%Ti, the balance is Fe and unavoidable impurities by weight percentage; the hot-rolled steel plate The tensile strength is 715MPa, the yield strength is 480MPa, the yield ratio is 0.67, the elongation is 24%, and the work hardening index n value is 0.19; its metallographic structure is ferrite matrix + martensite + a small amount of bainite, such as figure 1 As shown, the volume percentage of the ferrite matrix is ​​more than 50%, and the hard phase is mainly martensite; the tensile curve is as follows figure 2 As shown, it has continuous yield characteristics.

[0031] The preparation method of the above-mentioned one-steel multi-stage hot-rolled steel plate is:

[0032] According to the chemical composition: 0.08%C, 0.15%Si, 1.50%Mn, 0.02%Nb, 0.01%Ti, the balance is Fe to smelt molten steel and cast it into billets;

[0033]Heat the billet to 1200°C, ...

Embodiment 2

[0036] A steel multi-grade hot-rolled steel plate, the chemical composition is: 0.08%C, 0.15%Si, 1.50%Mn, 0.02%Nb, 0.01%Ti, the balance is Fe and unavoidable impurities by weight percentage; the hot-rolled steel plate The tensile strength is 713MPa, the yield strength is 498MPa, the yield strength ratio is 0.70, the elongation is 23%, the work hardening index n value is 0.18, and its metallographic structure is ferrite matrix + martensite + a small amount of bainite.

[0037] The preparation method of the above-mentioned one-steel multi-stage hot-rolled steel plate is:

[0038] According to the chemical composition: 0.08%C, 0.15%Si, 1.50%Mn, 0.02%Nb, 0.01%Ti, the balance is Fe to smelt molten steel and cast it into billets;

[0039] Heat the billet to 1180°C, keep it warm for 2 hours, and then carry out hot rolling. The hot rolling adopts a two-stage rolling process of austenite recrystallization zone + austenite non-recrystallization zone, the starting rolling temperature...

Embodiment 3

[0042] A steel multi-grade hot-rolled steel plate, the chemical composition is: 0.08%C, 0.15%Si, 1.50%Mn, 0.02%Nb, 0.01%Ti, the balance is Fe and unavoidable impurities by weight percentage; the hot-rolled steel plate The tensile strength is 708MPa, the yield strength is 475MPa, the yield strength ratio is 0.67, the elongation is 25%, the work hardening index n value is 0.15, and its metallographic structure is ferrite matrix + martensite + a small amount of bainite.

[0043] The preparation method of above-mentioned one-steel multi-stage low-cost hot-rolled steel plate is:

[0044] According to the chemical composition: 0.08%C, 0.15%Si, 1.50%Mn, 0.02%Nb, 0.01%Ti, the balance is Fe to smelt molten steel and cast it into billets;

[0045] Heat the billet to 1220°C, keep it warm for 2 hours, and then carry out hot rolling. The hot rolling adopts a two-stage rolling process of austenite recrystallization zone + austenite non-recrystallization zone, the starting rolling temper...

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Abstract

The invention belongs to the technical field of metallurgy, and specifically relates to a hot rolling steel plate with a characteristic of multiple grades in one steel, and a manufacturing method thereof. The chemical components of the hot rolling steel plate comprise, by weight, 0.06-0.08% of C, 0.15-0.35% of Si, 1.20-1.50% of Mn, 0.01-0.02% of Nb, 0.01-0.02% of Ti, and the balance of Fe and impurities, wherein the tensile strength covers 520-715 MPa, the yield strength covers 385-498 MPa, the yield ratio covers 0.56-0.90, the elongation covers 23-36%, the work hardening index n value is 0.15-0.21, and the metallurgical structure is a ferrite matrix and martensite, a ferrite matrix and bainite, or a ferrite matrix and martensite and bainite. The preparation method comprises that: a hot-rolled steel plate sequentially passes through a laminar flow cooling section and an air cooling section, and then is cooled through an ultra-fast cooling section to achieve a temperature of 600-50 DEG C to coil, wherein the cooling rate at the ultra-fast cooling section is at least 80 DEG C / s. According to the present invention, the steel billet with the one component can be used for producing plural tissue types and proportions of steel plates with different strength grades, and rolling control and cooling control are adopted to achieve steel plate structure regulation so as to achieve the multiple grades in the one steel through the simple, inexpensive and low-cost component system.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a one-steel multi-stage hot-rolled steel plate and a manufacturing method thereof. Background technique [0002] With the development of automobiles in the direction of energy saving, consumption reduction, and environmental protection, steel for automobiles is facing severe challenges. Steel grades with simple design components, low cost, and meeting the performance requirements of various parts of automobiles have become the most important steel products for the automobile industry. urgent demands of the industry. In order to obtain a lightweight steel plate with good strength and toughness matching, hot rolling + heat treatment process is often used at present, or complex composition design is used to obtain high strength and good forming of ferrite matrix + hard phase through controlled rolling and controlled cooling However, the steel plates for automotive st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C21D8/02
Inventor 袁国利成宁康健王国栋姬凤芹刘洺甫
Owner NORTHEASTERN UNIV LIAONING
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