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Silicon-killed steel wire material and spring

A technology of silicon-killed steel and wire rods, applied in low internal friction springs, spring/shock absorbers, mechanical equipment, etc., can solve problems such as fatigue strength, impossibility, and difficulty

Inactive Publication Date: 2009-10-07
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0029] However, only relying on the existing methods cannot meet the demand for higher fatigue resistance characteristics in the future
In addition, in order to further promote deformation, the melting point of the inclusions must be lowered, and there are a large number of announced SiO 2 -Al 2 o 3 -CaO-MgO-MnO and other systems, even if a significantly lower melting point is pursued, it is difficult to achieve a level higher than this
[0030] Although there are existing technologies that specify components such as Ba, Sr, Ca, and Mg, they cannot make full use of the differences in various components or the effect of compounding, and it is only a technology that cannot achieve the fatigue strength that can withstand the current high demand

Method used

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  • Silicon-killed steel wire material and spring
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  • Silicon-killed steel wire material and spring

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] Experiments are implemented at real machine or lab level. That is to say, the actual machine taps the molten steel smelted in the converter into the ladle (the laboratory is smelting 500kg of molten steel, which simulates the molten steel tapped from the converter), and adds various fluxes to adjust the composition to make it As appropriate, electrode heating and argon bubbling are performed, and molten steel treatment (slag refining) is performed. In addition, alloy elements such as Ca, Mg, Ce, Ba, Li, etc. are added during the molten steel treatment as needed. Next, the molten steel is cast into a steel ingot (casting is carried out in a mold capable of obtaining the same cooling rate as the real machine at the laboratory level). The obtained steel ingot was forged and hot-rolled to obtain a steel wire rod with a diameter of 8.0 mm.

[0104] For each obtained steel wire rod, the composition of oxide inclusions in the wire rod was measured, and an evaluation test sim...

Embodiment 2

[0140] Experiments are implemented at real machine or lab level. That is to say, the actual machine taps the molten steel smelted in the converter into the ladle (the laboratory is smelting 500kg of molten steel, which simulates the molten steel tapped from the converter), and adds various fluxes to adjust the composition to make it If appropriate, implement electrode heating and argon blowing, and implement molten steel treatment (slag refining). In addition, alloy elements such as Ca, Mg, Ce, Ba, Sr, and Li are added during the molten steel treatment as needed. Next, the molten steel is cast into a steel ingot (casting is carried out in a mold capable of obtaining the same cooling rate as the real machine at the laboratory level). The obtained steel ingot was forged and hot-rolled to obtain a steel wire rod with a diameter of 8.0 mm.

[0141] For each obtained steel wire rod, the composition of oxide inclusions in the wire rod was measured, and an evaluation test simulatin...

Embodiment 3

[0177] Experiments are implemented on a real machine (or laboratory level). That is, the actual machine is to tap molten steel smelted in a converter into a ladle (the laboratory is to smelt 500kg of molten steel, which simulates the molten steel tapped from a converter), add various fluxes, implement composition adjustment, and electrode heating And argon blowing, the implementation of molten steel treatment (slag refining). In addition, after adjusting other components, Ca, Mg, Ce, Ba, Li, etc. were added to the molten steel treatment as needed, and kept for 5 minutes or more. The obtained steel ingot was forged and hot-rolled to obtain a steel wire rod having a diameter of 8.0 mm.

[0178] For each of the obtained steel wire rods, the contents of Ba and Li in the steel were measured by the following method, and an evaluation test simulating a rotational bending fatigue test of a valve spring was performed.

[0179] [Contents of Ba and Li in steel]

[0180] 1) When the co...

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Abstract

A silicon-killed steel wire material which has been made suitable for obtaining a spring with excellent fatigue properties by regulating inclusions so as to be reduced in melting point and thereby facilitating deformation. Also provided is a spring having excellent fatigue properties which is obtained from the steel wire material. The silicon-killed steel wire material contains oxide inclusions which comprise 30-90% SiO2, 2-50% Al2O3, up to 35% (excluding 0%) MgO, up to 50% (excluding 0%) CaO, up to 20% (excluding 0%) MnO, and 0.2-20% BaO, provided that the total content of CaO and MgO is 3% or higher.

Description

technical field [0001] The present invention relates to a silicon-killed steel wire excellent in fatigue resistance and a spring obtained from the steel wire, which can exhibit high fatigue resistance as high-strength springs (valve springs, clutch springs), etc. It is useful as raw materials for valve springs, clutch springs and brake springs of automobile engines, as well as suspension springs and steel cords. Background technique [0002] Recently, as the demand for weight reduction and higher output of automobiles has increased, even valve springs and suspension springs used in engines and suspensions have been directed to high-stress designs. Therefore, among these springs, it is strongly desired that they are excellent in fatigue resistance and damping resistance in order to cope with an increase in load stress. In particular, there is a strong demand for an increase in the fatigue strength of valve springs, and it is difficult to respond to SWOSC-V (JIS G 3566), whic...

Claims

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Application Information

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IPC IPC(8): C22C38/00C22C38/06C22C38/58F16F1/02C21C7/00C21C7/04C21C7/06
Inventor 杉村朋子坂本浩一
Owner KOBE STEEL LTD
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