Calcium sulfur magnesium series easy cutting steel

A technology of free-cutting steel and sulfur-magnesium, which is applied in the field of metal materials, can solve the problems of austenite grain growth and other problems, and achieve the effects of low cost, excellent mechanical properties and good free-cutting performance

Inactive Publication Date: 2003-04-16
LAIWU IRON & STEEL GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the steel grades treated with calcium alone have easy cutting performance only when high-speed cutting with cemented carbide tools, and the austenite grain growth tendency of calcium free-cutting steel is relatively large

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] A calcium-sulfur-magnesium free-cutting steel, smelted by electric arc furnace, bottom-blown argon and electromagnetic stirring, the main components (Wt%) are: C: 0.45, Si: 0.30, Mn: 1.1, P: 0.02, S: 0.04, Ca: 0.006, Mg: 0.002. Use neutral thin covering slag, its composition is CaO20-35%, SiO 2 25-40%, Al 2 o 3 30-40%.

[0015] Deoxidation method and steps: first use ferromanganese to deoxidize, and then use wire feeding method to insert Ca-Si cored wire and magnesium alloy cored wire into molten steel for controlled deoxidation, and use zirconia solid electrolyte oxygen concentration battery to quickly determine oxygen probe Oxygen activity in molten steel, the oxygen activity of molten steel before wire feeding should be controlled at 80×10 -6 . The magnesium alloy cored wire used in smelting uses magnesium oxide as the magnesium source, adds aluminum as the reducing agent, and adds a certain amount of calcium oxide and calcium fluoride to mix evenly to make a ma...

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PUM

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Abstract

The invention relates to the fast machine steel containing elements of calcium, sulfur and magnesium belonging to the area of metal material. The invented material can be utilized to manufacture important parts such as crankshafts and connecting rods applied in automobiles. Measures are taken such as the neutral covering dregs, diffusion deoxidation, deoxidation by use of feeding wire, deteroprating the encrusting matter by use of the elements of calcium, sulfur and magnesium etc. to produce the steel with both of good mechanical and fast machine properties. The mechanical properties of steels Y45CaSMg, Y45CaSMg are as following: the tensile strength as 800 MPa for sample in hot rolling state, the extensibility as 17.7% and the contraction of area as 47%.

Description

Technical field: [0001] The invention belongs to the field of metal materials, in particular to a free-cutting steel containing calcium, sulfur and magnesium elements, which can be used to manufacture important parts of automobiles and machinery such as crankshafts and connecting rods. Background technique: [0002] Most chalcogenide free cutting steels reduce the plasticity and toughness of the material, especially the poor transverse mechanical properties. Lead-based free-cutting steel not only improves the free-cutting performance but also maintains good mechanical properties. However, due to the volatilization of lead in the smelting of lead-based free-cutting steel, which pollutes the environment and endangers human health, its application tends to decline. The calcium free-cutting steel developed from the 1960s has received widespread attention. When smelting calcium free-cutting steel, use calcium alloy to control deoxidation, so that CaO-SiO can be formed in the ste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/60
Inventor 朱荣李联生董杰李丰功王玉钢仇永全许丹娘
Owner LAIWU IRON & STEEL GRP
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