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A kind of steel plate with a tensile strength of 750mpa grade thick gauge automobile frame and its preparation method

A technology for automobile girders and tensile strength, which is applied in the field of metallurgy, and can solve problems such as scale shedding, slow rolling rhythm, and large deformation resistance

Active Publication Date: 2020-04-28
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, during the rolling process of thick product specification automobile frame steel, the rolling rhythm slows down, coupled with the high temperature of the furnace, the strip steel is in a high temperature state above 950°C throughout the rolling process, so that the final hot-rolled products The oxide scale becomes thicker, which increases the difficulty of subsequent descaling
In addition, high-strength grade steel for automobile beams has a large deformation resistance, which will cause serious oxide scale shedding defects in the subsequent deep processing process
Based on the above problems, the production technology of traditional low-strength grade pickling-free steel is no longer suitable for high-strength steel with a tensile strength of 750MPa. Therefore, in order to meet market demand, it is urgent to develop a new pickling-free technology to meet the tensile strength of 750MPa. Production of pickling-free high-strength steel above grade

Method used

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  • A kind of steel plate with a tensile strength of 750mpa grade thick gauge automobile frame and its preparation method
  • A kind of steel plate with a tensile strength of 750mpa grade thick gauge automobile frame and its preparation method
  • A kind of steel plate with a tensile strength of 750mpa grade thick gauge automobile frame and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of thick gauge automobile frame steel with a tensile strength of 750MPa and a thickness specification of 6mm:

[0034] Heat the slab with a thickness of 230mm to 1200°C and hold it for 240min. The chemical composition of the slab is: C: 0.03, Si: 0.05%, Mn: 1.0%, S: 0.015%, P: 0.025%, Als : 0.015%, Cr: 0.2%, Ti: 0.07%, Nb: 0.02%, and the rest are Fe and unavoidable impurities during smelting. The steel slab after being released from the furnace is subjected to rough rolling at a starting temperature of 1130°C for 5 passes to obtain an intermediate slab with a thickness of 34mm; the rough rolled intermediate slab is subjected to finish rolling with 7 passes. The finish rolling entrance temperature is 1050°C, the finish rolling temperature is 890°C, and the rolling speed of the F7 stand is 8m / s to obtain a 6mm thick strip. The descaling water pressure for heating furnace descaling, rough rolling descaling and finishing rolling descaling is 20MPa. The cooling...

Embodiment 2

[0036] Preparation of thick gauge automobile frame steel with a tensile strength of 750MPa and a thickness specification of 6mm:

[0037]Heat the slab with a thickness of 210mm to 1300°C and hold it for 180min. The chemical composition of the slab is: C: 0.12%, Si: 0.60%, Mn: 2.5%, S: 0.010%, P: 0.020%, Als: 0.045%, Cr: 1.0%, Ti: 0.15%, Nb: 0.08%, and the rest are Fe and unavoidable impurities during smelting. Rough rolling is carried out on the steel slab after being released from the furnace, the rolling temperature is 1180°C, and rolling is carried out for 5 passes to obtain an intermediate slab with a thickness of 48 mm; the rough rolled intermediate slab is subjected to finish rolling, and the finishing rolling passes are 7 passes. The finish rolling entrance temperature is 1050°C, the finish rolling temperature is 850°C, and the rolling speed of the F7 stand is 7m / s to obtain a 6mm thick strip. The descaling water pressure for heating furnace descaling, rough rolling de...

Embodiment 3

[0039] Preparation of thick gauge automobile frame steel with a tensile strength of 750MPa and a thickness specification of 8mm:

[0040] Heat the slab with a thickness of 230mm to 1250°C and hold it for 200min. The chemical composition of the slab is: C: 0.05%, Si: 0.05%, Mn: 1.5%, S: ≤0.015%, P: ≤0.025 %, Als: 0.025%, Cr: 0.2%, Ti: 0.09%, Nb: 0.03%, and the rest are Fe and unavoidable impurities during smelting. The steel slab after being released from the furnace is subjected to rough rolling at a starting temperature of 1130°C for 5 passes to obtain an intermediate slab with a thickness of 52mm; the rough rolled intermediate slab is subjected to finish rolling with 7 passes. The finish rolling entrance temperature is 1040°C, the finish rolling temperature is 880°C, and the rolling speed of the F7 stand is 6m / s to obtain a strip with a thickness of 8mm. The descaling water pressure for heating furnace descaling, rough rolling descaling and finishing rolling descaling is 20...

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Abstract

The present invention is a thick automobile girder steel plate with a tensile strength of 750 MPa and a preparation method thereof. The chemical composition of the steel plate in mass percentage is: C: 0.03~0.12%, Si: 0.05~0.60%, Cr: 0.2~1.0%, Mn: 1.0~2.5%, S: ≤0.015%, P: ≤0.025%, Als: 0.015~0.045%, Ti: 0.07~0.15%, Nb: 0.02~0.08%, and the rest are Fe and inevitable impurities during smelting. During preparation, the steel billet with the above chemical composition ratio is used for reasonable process design, so as to avoid the pickling preparation process replacing the original process, reduce the thickness of the iron oxide scale, and obtain Fe at the same time. 3 O 4 , FeO and eutectoid Fe 3 O 4 / α-Fe coexist with the complex phase structure of iron oxide scale, thereby significantly improving the surface quality of the steel plate, which can meet the requirements of direct stamping or roll forming without pickling. Eliminating the pickling process improves production efficiency while reducing environmental pollution and production costs.

Description

Technical field: [0001] The invention belongs to the technical field of metallurgy, and in particular relates to an automobile frame steel plate with a tensile strength of 750 MPa and a thick specification and a preparation method thereof. Background technique: [0002] With the development of the automobile industry and the automobile industry, automobile lightweight has become a new trend in the development of the automobile industry. In order to meet the requirements of lightweight automobiles, the demand for high-strength steels for automobiles is increasing. Therefore, the development of high-strength automotive frame steels has become a research hotspot for automotive steels. As the main structural part of the car, the car frame steel bears most of the weight of the car body. In order to ensure the safety of the car, the car frame steel must have sufficient strength and rigidity to withstand the load from the car and the impact from the wheels, and resist tension. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/26C22C38/28C21D8/02C22C33/04
Inventor 李志峰刘振宇曹光明崔春圆王皓李成刚
Owner NORTHEASTERN UNIV LIAONING
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