690 MPa grade high-strength low-yield-ratio medium-manganese steel medium-thickness steel and manufacturing method

A technology with low yield-strength ratio and manufacturing method, which is applied in the field of 690MPa high-strength, low-yield-ratio, medium-thickness steel and medium-thickness steel, can solve the problems of poor low-temperature toughness and high yield-strength ratio of high-strength structural steel. The effect of cracking performance, lower yield ratio and excellent comprehensive performance

Inactive Publication Date: 2020-02-28
NANJING IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The steel plate produced has excellent comprehensive performance, which can solve the problems of poor low-temperature toughness and high yield ratio of high-strength stru

Method used

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  • 690 MPa grade high-strength low-yield-ratio medium-manganese steel medium-thickness steel and manufacturing method
  • 690 MPa grade high-strength low-yield-ratio medium-manganese steel medium-thickness steel and manufacturing method
  • 690 MPa grade high-strength low-yield-ratio medium-manganese steel medium-thickness steel and manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment provides a 690MPa-grade high-strength low-yield-ratio medium-manganese steel medium-thick steel with a thickness of 70 mm. Its chemical composition and mass percentage are as follows: C: 0.09%, Mn: 4.65%, Si: 0.22%, P: 0.008%, S: 0.001%, Ti: 0.028%, Ni+Cr+Mo: 0.58%, and the balance is Fe and unavoidable impurities.

[0031] The manufacturing method of above-mentioned steel plate is as follows:

[0032] Converter smelting after molten iron desulfurization treatment to reduce S and P content in molten steel; Alloying the required mass fractions of C, Mn, Si, Ti, Ni, Cr, Mo elements after LF refining; adopting continuous casting method, continuous casting slab The casting speed is 0.5m / min, the surface defects are cleaned up, and a slab with a thickness of 320mm is obtained; the slab is heated to 1130°C, and the soaking time is 70min; the heated slab is rolled in two stages, and the rolling temperature of the first stage is 1010 ℃, the finish rolling tempe...

Embodiment 2

[0034] This embodiment provides a 690MPa-grade high-strength low-yield-ratio medium-manganese steel medium-thick steel with a thickness of 50mm. Its chemical composition and mass percentage are as follows: C: 0.06%, Mn: 4.47%, Si: 0.26%, P: 0.009%, S: 0.001%, Ti: 0.026%, Ni+Cr+Mo: 0.46%, and the balance is Fe and unavoidable impurities.

[0035] The manufacturing method of above-mentioned steel plate is as follows:

[0036] Converter smelting after molten iron desulfurization treatment to reduce S and P content in molten steel; Alloying the required mass fractions of C, Mn, Si, Ti, Ni, Cr, Mo elements after LF refining; adopting continuous casting method, continuous casting slab The casting speed is 0.6m / min, the surface defects are cleaned up, and a slab with a thickness of 320mm is obtained; the slab is heated to 1130°C, and the soaking time is 70min; the heated slab is rolled in two stages, and the rolling temperature of the first stage is 1005 ℃, the finish rolling temper...

Embodiment 3

[0038] This example provides a 690MPa-grade high-strength low-yield-ratio medium-manganese steel medium-thick steel with a thickness of 30mm. Its chemical composition and mass percentage are as follows: C: 0.05%, Mn: 4.28%, Si: 0.21%, P: 0.008%, S: 0.001%, Ti: 0.033%, Ni+Cr+Mo: 0.39%, and the balance is Fe and unavoidable impurities.

[0039] The manufacturing method of above-mentioned steel plate is as follows:

[0040]Converter smelting after molten iron desulfurization treatment to reduce S and P content in molten steel; Alloying the required mass fractions of C, Mn, Si, Ti, Ni, Cr, Mo elements after LF refining; adopting continuous casting method, continuous casting slab The casting speed is 0.6m / min, the surface defects are cleaned up, and a slab with a thickness of 260mm is obtained; the slab is heated to 1110°C, and the soaking time is 59min; the heated slab is rolled in two stages, and the rolling temperature of the first stage is 1005 ℃, the finish rolling temperatur...

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Abstract

The invention discloses 690 MPa grade high-strength low-yield-ratio medium-manganese steel medium-thickness steel and a manufacturing method, and relates to the technical field of steel smelting. Thesteel comprises the following chemical components of, in percentage by mass, 0.05%-0.10% of C, 4.1%-4.7% of Mn, 0.15%-0.4% of Si, less than or equal to 0.010% of P, less than or equal to 0.003% of S,0.01%-0.05% of Ti, less than or equal to 0.6% of Ni + Cr + Mo, and the balance Fe and inevitable impurities. The requirements of ultra-high strength steel safety performance and construction cost in acomplex environment in the field of engineering machinery can be met.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a medium-thick steel of 690MPa grade high-strength low-yield ratio medium-manganese steel and a manufacturing method thereof. Background technique [0002] 690MPa high-strength steel for construction machinery is widely used in important fields of national economy such as construction machinery, coal mine hydraulic supports, military pontoons, crane booms, etc. The composition system of this level of high-strength steel is mostly added with high content of Ni, Cr, and Mo elements. There is a problem of high cost, and the hardenability of thick gauge products is poor, the structure in the thickness direction is uneven, the toughness of the steel core is low, and the yield ratio is too high (generally above 0.94), which will lead to Lead to local large deformation and cause overload instability. Contents of the invention [0003] In order to solve the above techn...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/08C22C38/12C22C38/14C22C38/22C22C38/28C22C38/38C22C38/44C22C38/50C22C38/58C21D8/02C22C33/04
CPCC22C38/02C22C38/04C22C38/14C22C38/12C22C38/08C22C38/22C22C38/28C22C38/38C22C38/44C22C38/50C22C38/58C22C33/04C21D8/0205C21D8/0226C21D8/0263C21D6/004C21D8/0273C21C7/064C21D1/185C21D8/0247B22D11/0408
Inventor 段东明孙超陈颜堂周玉伟王从道李明
Owner NANJING IRON & STEEL CO LTD
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