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Tin calcium titanium series free-cutting steel

A technology of free-cutting steel and perovskite, applied in the field of metal materials, can solve problems such as austenite grain growth

Inactive Publication Date: 2005-09-14
UNIV OF SCI & TECH BEIJING
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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
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Embodiment Construction

[0014] 1. Smelting furnace type: electric arc furnace

[0015] Smelting process: first use aluminum ash with 20-40% aluminum for deoxidation, and then use wire feeding method to insert Ca-Si cored wire and ferrotitanium into molten steel for controlled deoxidation.

[0016] Oxygen activity in molten steel was determined using a rapid oxygen probe with a zirconia solid electrolyte oxygen concentration cell. The oxygen activity of molten steel before wire feeding should be controlled at 100×10 -6 .

[0017] Neutral thin covering slag is used in smelting, its composition is CaO30%, SiO 2 30%, Al 2 o 3 40%.

[0018] Smelting tin-calcium-titanium free-cutting steel, called Y15SnCaTi free-cutting steel, the main components (Wt%) are: C: 0.15, Si: 0.25, S: 0.060, Mn: 0.60, Sn: 0.20, Ca: 0.0017, Ti : 0.10, P: ≤0.04, the balance being Fe.

[0019] 2. Smelting furnace type: induction furnace

[0020] Smelting process: Firstly, ferromanganese is used for deoxidation, and secondly...

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Abstract

The invention relates to a tin-calcium ¿Ctitanium free machining steel that belongs to metallic material field, especially to manufacture high strength bolt, crankshaft, connecting bar, etc. that is the important part of automobile or mechanism. The Y15SnCaTi free machining steel contains carbon content 0.12-0.18% has the following mechanical properties: tensile strength reaches 400MPa, specific elongation is 22.0%, contraction of area is 37%, hardness of HB is less than 170 that has reached the standard of the corresponding steel of Y15Pb in GB8731-88 that can be used to manufacture high strength bolt. The Y45SnCaTi free machining steel has the following mechanical properties: tensile strength reaches 800MPa, specific elongation is 17.7%, contraction of area is 47%, and the hardness of HB is less than 240 that have reached the standard of the corresponding steel of Y45Ca in GB8731-88 that can be used to manufacture crankshaft and connecting bar.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to a free-cutting steel containing tin perovskite, which can be used to manufacture high-strength bolts, crankshafts, connecting rods and other important parts of automobiles and machinery. 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. [0003] Tin and lead belong to the same group in the periodic table of chemical elements, and their physical and chemical properties are very similar. As an easy-cutting element, tin is a good substitute for lead. [000...

Claims

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Application Information

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IPC IPC(8): C21C5/00C21C7/00C22C33/04C22C38/14
Inventor 朱荣李联生
Owner UNIV OF SCI & TECH BEIJING
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