Rare earth treated thick 700 MPa-grade automobile beam steel strip and manufacturing method thereof

A technology of automobile girder steel and manufacturing method, which is applied in the field of metallurgy, and can solve the problems of high manufacturing cost, thickness specification not exceeding 15.0mm, single thickness specification, etc.

Inactive Publication Date: 2020-10-23
BAOTOU IRON & STEEL GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN109161806A discloses a 700MPa grade automobile beam steel strip and its preparation method, only publishes the mechanical properties with a thickness of 14.0mm, and the thickness specification is singl

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  • Rare earth treated thick 700 MPa-grade automobile beam steel strip and manufacturing method thereof
  • Rare earth treated thick 700 MPa-grade automobile beam steel strip and manufacturing method thereof

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[0039] Examples:

[0040] According to the specific chemical composition shown in Table 1, the rare-earth-treated 700MPa grade automotive beam steel strip is prepared, and the preparation process is as follows:

[0041] The molten iron is subjected to desulfurization pretreatment, and the top and bottom combined blowing converter smelting is used to decarburize and dephosphorize the molten iron to obtain molten steel. The final tapping temperature of the converter is ≥1620℃; then the molten steel after converter smelting is subjected to LF refining process, and ferromanganese is added according to the composition of the molten steel , Ferrosilicon, Ferro-niobium and other alloys are adjusted to the target composition, and the Fe-Ca wire (high calcium wire) is fed for calcium treatment. After the wire is fed, the soft blowing time is guaranteed 8-15min to prevent the molten steel from being exposed. After LF refining, the molten steel is subjected to RH operation. Ce-Fe alloy is add...

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Abstract

The invention discloses a rare earth treated thick 700 MPa-grade automobile beam steel strip. The rare earth treated thick 700 MPa-grade automobile beam steel strip comprises the following chemical components in percentage by weight: 0.06-0.09% of C, 0.10-0.30% of Si, 1.60-1.90% of Mn, no more than 0.020% of P, no more than 0.005% of S, 0.020-0.050% of Alt, 0.04-0.06% of Nb, 0.07-0.10% of Ti, no more than 0.0040% of N, 0.00100-0.0030% of Ce, and the balance of Fe and inevitable impurities. The invention further discloses a manufacturing method of the rare earth treated thick 700 MPa-grade automobile beam steel strip. The alloy component design adopts Nb-Ti microalloy, contains no noble element Mo, and aims to fully exert such characteristics as modification of rare earth inclusions, grainrefining and improvement of low-temperature impact toughness through adding rare earth elements; and through matching with optimized heating and rolling processes, automobile beam steel with thick specification and excellent toughness matching is produced, and the specification range and the use temperature range of the strength-grade automobile beam steel are widened.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a rare earth-treated 700MPa-grade automobile frame steel belt and a manufacturing method thereof. Background technique [0002] Reducing the weight of the vehicle body by increasing the strength of the steel plate, reducing consumption, saving energy, and reducing environmental pollution are important topics in the research of today's automobile industry. At home and abroad, at this stage, some microalloying elements are mostly used to strengthen the strength of steel. Girder steel, as a safe load-bearing part of passenger and freight vehicles, has high requirements on performance and formability. However, the alloying elements, dosage, and process used are different, and are related to the equipment, technology, and raw materials of each factory. At present, the production technology of girder steel below 700MPa is quite mature, and it is widely used in the automobile indus...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C21D8/02
CPCC21D8/0205C21D8/0226C22C38/005C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 杨维宇张智刚刘妍宿成张嘉华刘德勤魏晓东刘野刘智光
Owner BAOTOU IRON & STEEL GRP
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