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Production method of non-quenched and tempered steel for engine crankshaft

A non-quenched and tempered steel and production method technology, applied in the field of metallurgy, can solve the problems of increasing the production cost of non-quenched and tempered steel, achieve the effects of low production raw material costs, reduce product processing procedures and production costs, and increase investment and production costs

Active Publication Date: 2022-06-28
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in order to make the performance of non-quenched and tempered steel products reach or approach the level of quenched and tempered steel, non-quenched and tempered steel usually needs to add certain microalloying elements such as V, Ni, and Mo to play the role of fine grain strengthening and precipitation strengthening. Will increase the production cost of non-quenched and tempered steel

Method used

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  • Production method of non-quenched and tempered steel for engine crankshaft
  • Production method of non-quenched and tempered steel for engine crankshaft
  • Production method of non-quenched and tempered steel for engine crankshaft

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Production method of non-quenched and tempered steel for engine crankshaft. 0.018%, N=0.0177%, the rest are Fe and inevitable impurities; key process steps include:

[0021] (1) Double blowing converter smelting: molten iron is directly fed into the furnace, the total loading of molten iron and scrap steel is 147t, scrap steel accounts for 32%, the tapping temperature is 1628 °C, the end-point active oxygen content is 270 ppm, and 350 kg of aluminum and iron are added during the tapping process for precipitation. For deoxidation, add 300kg of high-alumina refined synthetic slag + 400kg of lime for slag washing, and use a slide plate to stop the slag to control the amount of slag to ensure that the thickness of the top slag of the ladle is 38mm.

[0022] (2) Refining: 40kg aluminum pellets + 180kg silicon carbide are added to the LF furnace for diffusion and deoxidation, the total slag amount is 12.8kg / ton of steel, the white slag retention time is 35min, and when the re...

Embodiment 2

[0027] Production method of non-quenched and tempered steel for low-cost engine crankshaft. =0.021%, N=0.0175%, the rest are Fe and inevitable impurities; the key process steps are as follows:

[0028] (1) Double blowing converter smelting: molten iron is directly fed into the furnace, the total loading of molten iron and scrap steel is 150t, scrap steel accounts for 33%, the tapping temperature is 1630°C, the end-point active oxygen content is 300ppm, and 350kg of aluminum iron is added during the tapping process for precipitation. For deoxidation, add 300kg of high-alumina refining synthetic slag + 400kg of lime for slag washing, and use slide plate to stop the slag to control the amount of slag to ensure that the thickness of the top slag of the ladle is 35mm.

[0029] (2) Refining: 40kg aluminum pellets + 180kg silicon carbide are added to the LF furnace for diffusion deoxidation, the total slag amount is 12.5kg / ton steel, and the white slag retention time is 37min. When t...

Embodiment 3

[0034] Production method of non-quenched and tempered steel for low-cost engine crankshaft. =0.020%, N=0.0179%, the rest are Fe and inevitable impurities; the key process steps are as follows:

[0035] (1) Double blowing converter smelting: molten iron is directly fed into the furnace, the total loading of molten iron and scrap steel is 152t, scrap steel accounts for 35%, the tapping temperature is 1638 °C, the terminal active oxygen content is 320 ppm, and 350 kg of aluminum and iron are added during the tapping process for precipitation. For deoxidation, add 300kg of high-alumina refined synthetic slag + 400kg of lime for slag washing, and use a slide plate to stop the slag to control the amount of slag to ensure that the thickness of the top slag of the ladle is 40mm.

[0036] (2) Refining: 40kg aluminum pellets + 180kg silicon carbide are added to the LF furnace for diffusion and deoxidation, the total slag amount is 12.8kg / ton steel, the white slag retention time is 37min...

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Abstract

Non-quenched and tempered steel for engine crankshaft and its production method, the chemical composition of the steel is C=0.35%~0.40%, Si=0.45%~0.70%, Mn=1.50%~1.70%, P≤0.020%, S= 0.055%~0.075%, Cr=0.25%~0.35%, Al=0.015%~0.035%, N=0.015%~0.019%, the rest is Fe and unavoidable impurities. The process steps include: (1) combined blowing converter smelting; (2) refining; (3) vacuum degassing treatment; (4) continuous casting. The non-quenched and tempered steel for the engine crankshaft produced by the method of the present invention omits microalloying elements such as relatively expensive V and Ni, and mainly uses lower Si and Mn alloying elements, and adds a small amount of relatively economical S , N, Al, Cr elements, the production of rolled round steel products has low inclusion content, uniform sulfide distribution, grain fineness of more than 8 grades, and good product performance consistency. performance requirements.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a non-quenched and tempered steel for low-cost engine crankshafts and a production method thereof. Background technique [0002] The conventional heat treatment of forgings processed from steel for traditional engine crankshafts is a process of reheating, re-austenizing, quenching and high-temperature tempering after the forgings are cooled to room temperature. The non-quenched and tempered steel eliminates the process of quenching and tempering heat treatment of forgings, which not only saves energy significantly, but also simplifies the processing process of forgings and shortens the furnace production cycle. However, in order to make the performance of non-quenched and tempered steel products reach or close to the level of quenched and tempered steel, non-quenched and tempered steel usually needs to add a certain amount of micro-alloying elements such as V, Ni, Mo to play the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/38B22D11/18B22D11/22C21C7/06C21C7/10C22C33/06
CPCC22C38/02C22C38/04C22C38/06C22C38/38C22C38/001C22C33/06C21C7/06C21C7/10C21C7/0056B22D11/18B22D11/225
Inventor 杨庚朝迟云广张群琥郑健刘建杨奇军沈锋
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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