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Spring steel round steel and production process thereof

A production process and technology of spring steel, applied in the field of metallurgy, can solve the problems of decreased plasticity and toughness, increased heat treatment cost, personal injury, etc., and achieve the effect of good hot workability, good cold workability, and small decarburization tendency

Active Publication Date: 2010-12-29
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when producing round steel, reticulated ferrite is often precipitated first under air-cooling conditions, resulting in a serious decrease in plasticity and toughness. The cold working process is easy to break, which is easy to cause personal injury, and hot working increases a lot of heat treatment costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1 The production process of spring steel round bar includes the following steps: converter or electric furnace smelting, LF refining, VD degassing, CCM continuous casting and bar rolling.

[0028] Converter or electric furnace smelting process: make the carbon content ≥ 0.05%, phosphorus content ≤ 0.015%, sulfur content ≤ 0.025% after tapping; use red envelopes, converter slag-blocking tapping, electric furnace slag-free tapping; tapping plus silicomanganese deoxidation, The addition amount is 600Kg; the tapping temperature is 1630°C.

[0029] LF refining process: The refining time is 30 minutes. During the refining process, carbon powder, silicomanganese, ferromanganese and ferrochrome are added to adjust the chemical composition. In the later stage of refining, 60 meters of CaSi wire is fed, and the tapping temperature is controlled at 1580 °C.

[0030] VD degassing process: Vacuum degree below 1 mbar, vacuum treatment for 15 minutes, after vacuum treatment...

Embodiment 2

[0034] Embodiment 2 The production process of spring steel round bar includes the following steps: converter or electric furnace smelting, LF refining, VD degassing, CCM continuous casting and bar rolling.

[0035] Converter or electric furnace smelting process: make the carbon content ≥ 0.05%, phosphorus content ≤ 0.015%, sulfur content ≤ 0.025% after tapping; use red envelopes, converter slag-blocking tapping, electric furnace slag-free tapping; tapping plus silicomanganese deoxidation, The addition amount is 700Kg; the tapping temperature is 1650°C.

[0036] LF refining process: The refining time is 40 minutes. During the refining process, carbon powder, silicon manganese, ferromanganese and ferrochrome are added to adjust the chemical composition. In the later stage of refining, 70 meters of CaSi wire is fed, and the tapping temperature is controlled at 1590 °C.

[0037] VD degassing process: Vacuum degree below 1 mbar, vacuum treatment for 20 minutes, after vacuum treatme...

Embodiment 3

[0041] Embodiment 3 The production process of spring steel round bar includes the following steps: converter or electric furnace smelting, LF refining, VD degassing, CCM continuous casting and bar rolling.

[0042] Converter or electric furnace smelting process: make the carbon content ≥ 0.05%, phosphorus content ≤ 0.015%, sulfur content ≤ 0.025% after tapping; use red envelopes, converter slag-blocking tapping, electric furnace slag-free tapping; tapping plus silicomanganese deoxidation, The addition amount is 700Kg; the tapping temperature is 1700°C.

[0043] LF refining process: The refining time is 45 minutes. During the refining process, carbon powder, silicon manganese, ferromanganese and ferrochrome are added to adjust the chemical composition. In the later stage of refining, 80 meters of CaSi wire is fed, and the tapping temperature is controlled at 1590 °C.

[0044] VD degassing process: Vacuum degree below 1 mbar, vacuum treatment for 25 minutes, after the vacuum tre...

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Abstract

The invention belongs to the field of metallurgy and discloses spring steel round steel and a production process thereof. The spring steel round steel comprises the following components in percentage by weight: 0.56 to 0.64 percent of carbon (C), 1.60 to 2.00 percent of silicon (Si), 0.70 to 1.00 percent of manganese (Mn), less than or equal to 0.025 percent of phosphorus (P), less than or equal to 0.025 percent of sulfur (S), 0.15 to 0.35 percent of chromium (Cr), less than or equal to 0.35 percent of nickel (Ni), less than or equal to 0.25 percent of copper (Cu) and the balance of Ferrum (Fe). The production process comprises the following steps of: converter or electric furnace smelting, LF refining, VD degassing, CCM continuous casting and bar rolling. The spring steel round steel of the invention has the characteristics of low alloying element content, low decarburizing tendency, high temper resistance, high hot-working performance, low cost, high performance after heat processing and the like of a common round steel; besides, the spring steel round steel simultaneously has high cold workability under the condition of air cooling after rolling. The process ensures that the rolled spring steel round steel obtains a texture of pearlite and a small number of ferrolites under the condition of air cooling, and has high plasticity and toughness during cold working, and every performance can meet the requirements of GB / T1222 after heat processing.

Description

technical field [0001] The invention belongs to the field of metallurgy and relates to a steel and a production process thereof, in particular to a spring steel round bar and a production process thereof. Background technique [0002] Spring steel 60Si2MnA has low content of alloying elements, low decarburization tendency, good tempering stability, good thermal processing performance, low cost, and excellent performance after heat treatment. It is widely used in industries such as automobiles, railways and construction machinery. However, when producing round steel, reticulated ferrite is often precipitated first under air-cooling conditions, resulting in a serious decrease in plasticity and toughness. The cold working process is easy to break, which is easy to cause personal injury, and hot working increases a lot of heat treatment costs. Contents of the invention [0003] The technical problem to be solved by the present invention is: aiming at the shortcomings of the ab...

Claims

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Application Information

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IPC IPC(8): C22C38/34C22C33/04
Inventor 沈朴恒王德炯
Owner NANJING IRON & STEEL CO LTD
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