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Medium carbon ferromanganese medium-thick steel for 800MPa engineering machinery and manufacturing method of medium carbon ferromanganese medium-thick steel

A technology of construction machinery and manufacturing methods, applied in the field of iron and steel smelting, to achieve the effects of good hardenability, improved ductility and plasticity, and high strength-yield-tensile ratio

Inactive Publication Date: 2020-10-16
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the above-mentioned technical problems, overcomes the shortcomings of the prior art, and provides a medium-manganese medium-thick steel for 800MPa engineering machinery and its manufacturing method. Under the demand for ultra-high-strength steel safety performance and low manufacturing cost

Method used

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  • Medium carbon ferromanganese medium-thick steel for 800MPa engineering machinery and manufacturing method of medium carbon ferromanganese medium-thick steel
  • Medium carbon ferromanganese medium-thick steel for 800MPa engineering machinery and manufacturing method of medium carbon ferromanganese medium-thick steel
  • Medium carbon ferromanganese medium-thick steel for 800MPa engineering machinery and manufacturing method of medium carbon ferromanganese medium-thick steel

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Experimental program
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Effect test

Embodiment 1

[0035] A kind of 800MPa medium-manganese medium-thick steel for engineering machinery provided in this embodiment has a thickness of 16mm, and its chemical composition and mass percentage are as follows: C: 0.06%, Mn: 5.1%, Si: 0.26%, P: 0.007%, S : 0.001%, Ti: 0.035%, Ni+Cr+Mo: 0.92%, and the balance is Fe and unavoidable impurities.

[0036] The manufacturing method is as follows: after the molten iron is desulfurized, it enters the converter for smelting to reduce the content of P and S in the molten steel, P: 0.007%, S: 0.001%; ​​LF refining completes the alloying of the mass fraction of each element, and the casting speed is 1.2m / min to obtain a slab with a thickness of 320mm, and the surface defects should be cleaned up; the slab is heated to a temperature of 1160°C, and the soaking time is 48min; the heated slab is subjected to controlled rolling, the first-stage rolling temperature is 1030°C, and the final rolling The temperature is 945°C, the second-stage rolling tem...

Embodiment 2

[0038] A kind of 800MPa medium-manganese medium-thick steel for construction machinery provided in this embodiment has a thickness of 35mm, and its chemical composition and mass percentage are as follows: C: 0.065%, Mn: 5.3%, Si: 0.26%, P: 0.007%, S : 0.001%, Ti: 0.021%, Ni+Cr+Mo: 1.13%, and the balance is Fe and unavoidable impurities.

[0039]The manufacturing method is as follows: after the molten iron is desulfurized, it enters the converter for smelting to reduce the content of P and S in the molten steel, P: 0.007%, S: 0.001%; ​​LF refining completes the alloying of the mass fraction of each element, and the casting speed is 1.2m / min to obtain a slab with a thickness of 320mm, and the surface defects should be cleaned up; the slab is heated to a temperature of 1150°C, and the soaking time is 48min; the heated slab is subjected to controlled rolling, the first-stage rolling temperature is 1030°C, and the final rolling The temperature is 940°C, the second-stage rolling te...

Embodiment 3

[0041] A kind of 800MPa medium-manganese medium-thick steel for engineering machinery provided in this embodiment has a thickness of 50mm, and its chemical composition and mass percentage are as follows: C: 0.075%, Mn: 5.5%, Si: 0.23%, P: 0.007%, S : 0.001%, Ti: 0.021%, Ni+Cr+Mo: 1.15%, and the balance is Fe and unavoidable impurities.

[0042] The manufacturing method is as follows: after the molten iron is desulfurized, it enters the converter for smelting to reduce the content of P and S in the molten steel, P: 0.007%, S: 0.001%; ​​LF refining completes the alloying of the mass fraction of each element, and the casting speed is 1.2m / min to obtain a slab with a thickness of 320mm, and the surface defects should be cleaned up; the slab is heated to a temperature of 1125°C, and the soaking time is 55min; the heated slab is subjected to controlled rolling, the first-stage rolling temperature is 1025°C, and the final rolling The temperature is 945°C, the second-stage rolling te...

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Abstract

The invention discloses medium carbon ferromanganese medium-thick steel for 800MPa engineering machinery and a manufacturing method of the medium carbon ferromanganese medium-thick steel, and relatesto the technical field of iron and steel smelting. The medium carbon ferromanganese medium-thick steel comprises the chemical components in percentage by mass of 0.05%-0.08% of C, 4.8%-5.8% of Mn, 0.10%-0.35% of Si, P being smaller than or equal to 0.010%, S being smaller than or equal to 0.003%, 0.01%-0.05% of Ti, 0.7%-1.2% of Ni+Cr+Mo, and balance Fe and inevitable impurities. The medium carbonferromanganese medium-thick steel can have excellent core mechanical properties than common 800MPa high-intensity structural steel, and requirements for extra-high-intensity steel safety performance and low manufacturing cost in the engineering machinery trade under complete adverse environment, can be met.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a medium-manganese medium-thick steel for 800MPa engineering machinery and a manufacturing method thereof. Background technique [0002] 800MPa grade steel for construction machinery is mainly used in large-scale electric shovels, drilling rigs, buckets of bulldozers, crane booms and turntables, and structural parts of coal mines. Ni, Mo and other relatively precious metal elements, through LF and RH vacuum treatment to reduce the P, S content and inclusions in steel, purify molten steel; use controlled rolling and controlled cooling, relaxation control precipitation principle and microalloy precipitation strengthening and other technological means to refine grain, improve the strength of the steel plate, and the thick gauge steel plate needs to be quenched and tempered, which has the problem of very high raw material cost and process cost. In particular, thick g...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/50C21D8/02C22C33/04
CPCC22C38/02C22C38/04C22C38/44C22C38/50C22C33/04C21D8/0205C21D8/0226C21D8/0263
Inventor 段东明孙超陈颜堂王从道周玉伟徐志祥
Owner NANJING IRON & STEEL CO LTD
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