Magnesium and calcium-containing 45MnVS free machining quenched and tempered steel and manufacturing method thereof

A technology of non-quenched and tempered steel and manufacturing method, which is applied in the field of iron and steel metallurgy, and can solve the problems of Al flocculent oxides with high nitrogen and hydrogen content, uneven composition and temperature, easy to block nozzles, etc.

Active Publication Date: 2016-07-27
SHANGHAI UNIV
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The sulfur-containing free-cutting steel produced by traditional electric furnace → LF → continuous casting → controlled rolling and controlled cooling or converter → LF → continuous casting → controlled rolling

Method used

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  • Magnesium and calcium-containing 45MnVS free machining quenched and tempered steel and manufacturing method thereof

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Embodiment 1

[0038]

[0039] A production process of 45MnVS free-cutting non-quenched and tempered steel containing magnesium and calcium:

[0040] Further preferably, the preparation method of Mg-Ca composite free-cutting non-quenched and tempered steel, in the case of ensuring that the chemical composition of the steel meets the requirements, the following steps are carried out:

[0041] (1) Smelting and alloying: desulfurization is not carried out on the molten iron in the converter, only decarburization and phosphorus are carried out, and silicomanganese-ferrosilicon-iron sulfide is added in the order of silicomanganese-ferrosilicon-iron sulfide for weak deoxidation when tapping 1 / 4 of the steel, and the oxygen content is controlled at 45ppm;

[0042] (2) LF furnace refining: add refining slag, submerged arc slag, add iron sulfide to control sulfur content, and carry out white slag treatment. In the later stage of LF, add silicon-magnesium-calcium alloy wire to the steel for Mg-Ca co...

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Abstract

The invention provides magnesium and calcium-containing 45MnVS free machining quenched and tempered steel and a manufacturing method thereof. The steel comprises the main components of 0.42% to 0.51% of C, 0.15% to 0.6% of Si, 0.90% to 1.50% of Mn, 0.010% to 0.035% of P, 0.040% to 0.080% of S, 0.06% to 0.13% of V, 0.0005% to 0.008% of Mg, 0.01% to 0.04% of Al, 0.0008% to 0.005% of Ca, and the balance being Fe and unavoidable impurities. According to the magnesium and calcium-containing 45MnVS free machining quenched and tempered steel and the manufacturing method thereof, though adopting converter control smelting, LF+VD magnesium calcium compounded inclusion form treatment modification, M-EMS+F-EMS composite continuous casting and controlled rolling and controlled cooling, and adding a trace amount of magnesium and calcium on the basis of traditional 45MnVS steel, the sulfur-containing inclusion is modified, the material strength index is equivalent to the quenching and tempering condition of No.45 steel, and the calcium-containing 45MnVS free machining quenched and tempered steel has machinability and fatigue resistance better than the 45MnVS steel, and is applicable to parts and structural parts such as automobile connecting rods, crank shafts, knuckle spindles, drive shafts and front axles.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a non-quenched and tempered steel and a production process thereof, and relates to a free-cutting non-quenched and tempered steel containing Mg-Ca and a manufacturing method thereof. Background technique [0002] Free-cutting non-quenched and tempered steel is a kind of steel that has achieved or approached the mechanical properties of quenched and tempered steel and has easy machinability through microalloying, controlled rolling and controlled cooling, etc. Class high-quality or special quality structural steel. Free-cutting non-quenched and tempered steel is widely used in parts and structural parts such as automotive connecting rods, crankshafts, steering knuckle shafts, drive shafts, front axles, etc., and its consumption is increasing day by day. It is a typical representative of automotive steel and caters to continuous machining The development in the direction o...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/60C22C38/12C22C38/06C22C33/04C21C7/076C21C7/10C21D8/00
CPCC21C7/076C21C7/10C21D8/005C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12C22C38/60Y02P10/20
Inventor 付建勋朱玉员李徐刘辉龚涛李健胡德林徐杰张明吴彦欣曹中佳谢欣悦
Owner SHANGHAI UNIV
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