Automobile steel with low cost and high strength ductility balance and preparation method thereof

A high-strength plastic product, low-cost technology, used in temperature control and other directions, can solve problems such as poor process performance, high cost, and difficult metallurgical production

Inactive Publication Date: 2010-02-03
CENT IRON & STEEL RES INST
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the second-generation automotive steel has added a large amount of alloying elements such as Cr, Ni, Mn, Si and Al, which makes its cost higher
At the same time, due to the high alloy content, the process performance of the steel is poor, and the metallurgical production is difficult, thus limiting its production and application

Method used

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  • Automobile steel with low cost and high strength ductility balance and preparation method thereof
  • Automobile steel with low cost and high strength ductility balance and preparation method thereof
  • Automobile steel with low cost and high strength ductility balance and preparation method thereof

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Embodiment

[0057] This embodiment is mainly aimed at the development of hot-rolled steel sheets and cold-rolled steel sheets for automobiles, and the test process simulates the continuous hot-rolling and cold-rolling processes of steel sheets. But the process is also suitable for medium and thick plates, profiles and rods and wires.

[0058] Steel smelting:

[0059] The steel of the present invention is smelted by a laboratory vacuum induction furnace, and the cast ingots are round ingots of 150 kg and 50 kg. A total of 14 furnaces of steel were smelted, of which 1-8# used a 150kg ingot shape, and 9-14# used a 50Kg ingot shape. The chemical composition is shown in Table 1. The CCT curve of 4# steel shows that the steel has good hardenability. and bainite transformation have a very long incubation period, with figure 1 .

[0060] Table 1 Chemical composition of the invented steel

[0061] C

mn

P

S

Nb

Ti

other

Ac1(°C)

1

0.02 ...

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Abstract

The invention provides automobile steel with low cost and high strength ductility balance and a preparation method thereof, belonging to the technical field of automobile steel. A multiphase, metastable and multiscale M<3> type organization structure is obtained based on reasonable design of chemical composition and partition of alloy elements and crucially based on the control of martensite phasetransformation, the repartition of solute such as C/Mn and the like and the austenite inverse phase transformation. The invention is characterized in that the martensite structure is obtained by using 0.02-0.50 wt%C and 3.50-9.00 wt%Mn in the cooling process of the inductrial production of steel plates and steel coils and the like; and superfine adverse transformation austenite and alpha phase substrate can be obtained through the partition of Mn and C in the heat preserving process between 100 DEG C below Acl and Acl, thus realizing the industrial production of hot rolled sheets and cold rolled sheets with high strength ductility balance used in automobiles. The invention has the advantages that the intensity is 0.7-1.3 GPa, the extension rate is 55-30% and the strength ductility balanceis 35-55 GPa%.

Description

technical field [0001] The invention belongs to the technical field of steel for automobiles, and provides a low-cost, high-strength plastic product steel for automobiles and a preparation method thereof. technical background [0002] High-strength and high-plasticity materials have always been the persistent pursuit of material workers, especially with the improvement of automotive lightweight and safety requirements, steel for automotive structural parts is required to have a high strength-plastic product (the product of tensile strength and elongation). The strength and plasticity of the first generation of automotive steel is at the level of 10-20GPa%, which can no longer meet the dual requirements of lightweight and high safety for the future development of the automotive industry. For example, the tensile strength of IF steel, BH steel, HSLA steel, DP steel and TRIP steel in the range of 200-1000MPa has a strength-plasticity product of 15-20GPa%, and the strength of ul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/58C22C38/38C22C38/16C22C38/14C22C38/12C22C38/08C22C38/06B21B37/74C21D1/26C21D8/02
Inventor 董瀚干勇翁宇庆曹文全时捷王毛球惠卫军
Owner CENT IRON & STEEL RES INST
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