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Tensile strength 800-MPa-class hot rolling complex phase steel and production method thereof

A technology of tensile strength and production method, which is applied in the field of hot-rolled multiphase steel with a tensile strength of 800 MPa and its production field, can solve the problems of poor surface quality of hot-rolled multiphase steel with high tensile strength, etc., and achieve the effect of increasing precipitation strengthening. , excellent strength, distribution and dispersion effect

Inactive Publication Date: 2019-10-18
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem of poor surface quality of the existing high tensile strength hot-rolled multiphase steel, the invention provides a hot-rolled multiphase steel with a tensile strength of 800MPa and a production method thereof; the yield strength is above 700MPa, and the tensile strength is above 800MPa , the hole expansion rate is greater than 60%, and the microstructure type is a mixed structure composed of ferrite, granular bainite and a small amount of island martensite. After continuous pickling, the product has excellent surface quality and performance, and is widely used in Manufacturing automotive chassis structural parts, seat belt brackets, bumpers and other components

Method used

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  • Tensile strength 800-MPa-class hot rolling complex phase steel and production method thereof
  • Tensile strength 800-MPa-class hot rolling complex phase steel and production method thereof
  • Tensile strength 800-MPa-class hot rolling complex phase steel and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0073] A hot-rolled multiphase steel with a tensile strength of 800 MPa in this example, its main chemical composition and mass percentage are shown in Example 1 in Table 1.

[0074] The production method of a kind of tensile strength 800MPa class hot-rolled composite phase steel of the present embodiment comprises the following steps:

[0075] S1. Pretreatment of molten iron requires pre-slagging and post-slagging, and [S]≤0.0050% after desulfurization of molten iron.

[0076] S2. Converter smelting, strengthen dephosphorization, and carry out deoxidation and alloying for tapping, and at the same time strengthen the operation of blocking slag for tapping.

[0077] S3. Alloy fine-tuning station, adding aluminum particles and stirring strongly to initially reduce the top slag of the ladle.

[0078] S4, LF+RH refining, using double refining process and Ca treatment process. On the basis of controlling the chemical composition of C, Si, Mn, Nb, Ti and Mo in molten steel, the co...

Embodiment 2

[0085] A hot-rolled multiphase steel with a tensile strength of 800 MPa in this example, its main chemical composition and mass percentage are shown in Example 2 in Table 1.

[0086] The production method of a kind of tensile strength 800MPa class hot-rolled composite phase steel of the present embodiment comprises the following steps:

[0087] S1. Pretreatment of molten iron requires pre-slagging and post-slagging, and [S]≤0.0050% after desulfurization of molten iron.

[0088] S2. Converter smelting, strengthen dephosphorization, and carry out deoxidation and alloying for tapping, and at the same time strengthen the operation of blocking slag for tapping.

[0089] S3. Alloy fine-tuning station, adding aluminum particles and stirring strongly to initially reduce the top slag of the ladle.

[0090] S4, LF+RH refining, using double refining process and Ca treatment process. On the basis of controlling the chemical composition of C, Si, Mn, Nb, Ti and Mo in molten steel, the co...

Embodiment 3

[0097] A hot-rolled multiphase steel with a tensile strength of 800 MPa in this example, its main chemical composition and mass percentage are shown in Example 3 in Table 1.

[0098] The production method of a kind of tensile strength 800MPa class hot-rolled composite phase steel of the present embodiment comprises the following steps:

[0099] S1. Pretreatment of molten iron requires pre-slagging and post-slagging, and [S]≤0.0050% after desulfurization of molten iron.

[0100] S2. Converter smelting, strengthen dephosphorization, and carry out deoxidation and alloying for tapping, and at the same time strengthen the operation of blocking slag for tapping.

[0101] S3. Alloy fine-tuning station, adding aluminum particles and stirring strongly to initially reduce the top slag of the ladle.

[0102] S4, LF+RH refining, using double refining process and Ca treatment process. On the basis of controlling the chemical composition of C, Si, Mn, Nb, Ti and Mo in molten steel, the co...

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Abstract

The invention discloses tensile strength 800-MPa-class hot rolling complex phase steel and a production method thereof and belongs to the field of metal material and preparation thereof. The tensile strength 800-MPa-class hot rolling complex phase steel comprises the main components of 0.05%-0.09% of C, 0.10%-0.30% of Si, 1.40%-2.00% of Mn, 0.010%-0.050% of Al, 0-0.020% of P, 0-0.008% of S, 0.010%-0.070% of Nb, 0.08%-0.14% of Ti, 0.10%-0.25% of Mo, and the balance Fe and inevitable impurities. Through treatment of casting blank hot charging, hot continuous rolling and related process steps, yield strength is 700 MPa or above, tensile strength is 800 MPa or above, the hole expansion rate is larger than 60%, the microstructural type is a mixed structure composed of ferrite, granular bainiteand a small amount of island-shaped martensite, after the product is subjected to continuous pickling, product surface quality and performance are excellent, and the product is widely used for manufacturing automobile chassis structural parts, safety belt supports, bumpers and other parts.

Description

technical field [0001] The invention belongs to the field of metal materials and their preparation, and more specifically relates to a hot-rolled multiphase steel with a tensile strength of 800MPa and a production method thereof. Background technique [0002] With increasingly stringent demands on energy, environmental protection and safety, automobile lightweight has become an inevitable choice for the development of the automobile industry, and the popularization and application of high-strength steel is an effective way to realize automobile lightweight, energy saving and emission reduction. In high-strength steels, multi-phase steels are composed of ferrite, bainite, martensite and precipitates, which not only have high strength and sufficient formability, but also have good work hardening characteristics, welding performance and flanging expansion. hole performance. Due to its good formability, complex phase steel is widely used to make complex automotive structural pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C21D8/02C22C33/04
CPCC21D8/0205C21D8/0226C21D8/0263C22C33/04C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14Y02P10/20
Inventor 谷海容汪永国曹煜晋家春刘飞刘阳卢茜倩
Owner MAANSHAN IRON & STEEL CO LTD
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