Vanadium-containing automobile transmission shaft steel and production method thereof

A production method and transmission shaft technology, applied in the metallurgical field, can solve the problems of poor toughness, plasticity and weldability of steel, and achieve the effect of good toughness

Inactive Publication Date: 2016-12-21
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the steel grades for automobile transmission shafts on the market are mainly designed to be carbon, manganese or Nb reinforced, which makes the toughness, plasticity and weldability of the steel poor.

Method used

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  • Vanadium-containing automobile transmission shaft steel and production method thereof
  • Vanadium-containing automobile transmission shaft steel and production method thereof
  • Vanadium-containing automobile transmission shaft steel and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] With a thickness of 2mm and a width of 1250mm, the chemical composition and weight percentage of vanadium-containing steel plates for automobile transmission shafts are: C: 0.08%, Si: 0.10%, Mn: 0.82%, P: 0.010%, S: 0.002%, V: 0.040% , Ti: 0.020%, Als: 0.015%, and the balance is Fe and unavoidable impurity elements. The microstructure of vanadium-containing automobile transmission shaft steel plate is ferrite plus pearlite, and pearlite accounts for about 8%.

[0041] Production method: 1) Smelting molten steel according to the above-mentioned composition, LF refining of molten steel, and continuous casting of slab to obtain slab; 2) Heating the slab to 1180°C, descaling with high-pressure water, rough rolling, and coiling in a hot coil box , finish rolling, and controlled cooling to obtain hot-rolled coils.

[0042] Among them, there are 5 passes of rough rolling, the outlet temperature is 1020°C; the finish rolling outlet temperature is 820°C, the laminar cooling rat...

Embodiment 2

[0044] Thickness 2.5mm, width 1250mm, chemical composition and weight percentage of vanadium-containing automobile drive shaft steel plate are: C: 0.09%, Si: 0.12%, Mn: 1.13%, P: 0.012%, S: 0.0025%, V: 0.045% , Ti: 0.022%, Als: 0.025%, and the balance is Fe and unavoidable impurity elements. The microstructure of vanadium-containing automobile transmission shaft steel plate is ferrite plus pearlite, and pearlite accounts for about 9%.

[0045] Production method: 1) Smelting molten steel according to the above-mentioned composition, LF refining of molten steel, and continuous casting of slab to obtain slab; 2) Heating the slab to 1200°C, descaling with high-pressure water, rough rolling, and coiling in a hot coil box , finish rolling, controlled rolling and cooling to obtain hot-rolled coils.

[0046] Among them, there are 5 passes of rough rolling, the exit temperature is 1040°C; the finish rolling exit temperature is 840°C, the laminar cooling rate is 23°C / min, and the coili...

Embodiment 3

[0048] Thickness 3mm, width 1250mm, chemical composition and weight percentage of vanadium-containing automobile transmission shaft steel plate are: C: 0.10%, Si: 0.15%, Mn: 1.25%, P: 0.014%, S: 0.010%, V: 0.050%, Ti: 0.025%, Als: 0.030%, and the balance is Fe and unavoidable impurity elements. The microstructure of vanadium-containing automobile transmission shaft steel plate is ferrite plus pearlite, and pearlite accounts for about 10%.

[0049] Production method: 1) Smelt molten steel according to the above-mentioned composition, LF refining of molten steel, and slab continuous casting process to obtain slab; 2) Heat the slab to 1240°C, descale with high-pressure water, rough rolling, and coil in a hot coil box , finish rolling, controlled rolling and cooling to obtain hot-rolled coils.

[0050] Among them, there are 5 passes of rough rolling, the outlet temperature is 1060°C; the finish rolling outlet temperature is 850°C, the laminar cooling rate is 24°C / min, and the coi...

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Abstract

The invention discloses a vanadium-containing automobile transmission shaft steel and a production method thereof. The vanadium-containing automobile transmission shaft steel is prepared from the following chemical components by mass percentage: less than or equal to 0.14% of C, less than or equal to 0.40% of Si, 0.80 to 1.40% of Mn, less than or equal to 0.035% of P, less than or equal to 0.025% of S, 0.010 to 0.080% of V, less than or equal to 0.06% of Ti, 0.015 to 0.060% of Als, and the balance of Fe and inevitable impurity elements. The production method comprises the following steps: converter smelting, LF (Ladle Furnace) refining, slab continuous casting, slab heating, high pressure water descaling, controlled rolling and controlled cooling processes. The hot rolled coil produced by the invention is added with a V strengthening element to obtain the vanadium-containing automobile transmission shaft steel plate with high strength and good ductility, 420-580MPa of tensile strength, more than or equal to 360MPa of yield strength, and more than or equal to 26 % of elongation, and the industrial production is realized.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to steel for a vanadium-containing automobile transmission shaft and a production method thereof. Background technique [0002] China is a country poor in niobium resources, and Brazil Metallurgical and Mining Co., Ltd. controls 85% of the world's niobium production. my country is rich in vanadium resources, ranking first in the world in both resource reserves and vanadium production. At present, the steel grades for automobile drive shafts on the market are mainly designed to be carbon-, manganese-strengthened or Nb-strengthened in chemical composition, which makes the toughness, plasticity and weldability of the steel poor. With the national energy saving and emission reduction and automobile lightweight requirements, the requirements for the use of automobile steel are becoming more and more stringent, and the strength level is gradually increasing. Therefore, a s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/12C22C38/06C22C38/02C22C38/14C21D8/02
CPCC22C38/04C21D8/0226C21D8/0263C21D2211/005C21D2211/009C22C38/02C22C38/06C22C38/12C22C38/14
Inventor 蒋建军包阔谷辉格张大伟魏跃军陈超
Owner HEBEI IRON AND STEEL
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