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Tin containing free-cutting steel

A technology of free-cutting steel and Benxi Steel, which is applied in the field of important standard parts and lead-free free-cutting steel, and can solve the problems of lead-polluted environment and so on

Inactive Publication Date: 2005-03-30
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to produce a free-cutting steel that does not contain lead, so as to solve the problem of lead polluting the environment in the steelmaking process

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0016] The main component weight percentage of steel grade is:

[0017] C: 0.20, Si: 0.45, Mn: 0.85, P: 0.05, S: 0.20, Sn: 0.05.

[0018] Thin slag CaO-SiO 2 -Al 2 o 3 The ternary slag covers the molten steel.

[0019] Diffusion deoxidation is carried out with ferromanganese and aluminum ash or carbon powder containing about 20% aluminum.

[0020] Use a zirconia solid electrolyte oxygen concentration cell to measure the oxygen activity in molten steel with a fast oxygen probe, and adjust it at any time. Smelted in a 500Kg induction furnace, the oxygen activity of molten steel before wire feeding is controlled at 70-100×10 -6 .

[0021] The tin content of molten steel is 0.05%.

[0022] Electromagnetic stirring is used to make the ingredients uniform.

[0023] Let it stand for 5 minutes, remove the scum, and pour.

[0024] The cutting performance of the steel is good. On the BJ-1630GD lathe, when the high-speed steel tool is used to perform the turning experiment on th...

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Abstract

The present invention relates to a tin-contained free machining steel. Said steel can be used for making important standard parts of high-strength Bolts, etc. of automobile and machinery, and is characterized by that in said steel 0.03-0.05% of Sn is contained. Said invention adopts the several measures of neutral covering slag molten steel, diffusing deoxygenation and solid electrolyte oxygen concentration difference cell to quickly define oxygen to develop out the leadless free machining steel (Y20Sn) with excellent mechanical propery and free-cutting machinability. The tests show that the tensile strength of its sample is up to 460MPa, percentage elongation is 25%-30% and reduction of cross-sectional area is 55%-60%.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy and material engineering, in particular to a lead-free free-cutting steel (Y20Sn), which can be used to manufacture high-strength bolts and other important standard 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 free-cutting steel has good mechanical properties and heat treatment performance, and has excellent free-cutting performance at medium and low cutting speeds. However, the production of lead free-cutting steels has been limited due to the pollution of the environment by lead in the steelmaking process. Contents of the invention [0003] The purpose of the invention is to produce a lead-free free-cutting steel to solve the problem of lead pollution in the steelmaking process. [0004] Tin and lead belong to the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/60
Inventor 董杰李联生朱荣李丰功仇永全孙彦辉许丹娘王玉刚
Owner UNIV OF SCI & TECH BEIJING
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