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65Si2CrVA spring steel and production process thereof

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

Inactive Publication Date: 2016-12-07
ANHUI HONGQIAO METAL MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when producing spring steel, reticulate 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

[0016] Electric furnace smelting process: Hongbao slag-free tapping, so that after tapping, C≥0.05%, P≤0.010%, S≤0.020%, fixed oxygen: [O]≤600ppm.

[0017] LF refining process: Aluminum deoxidation is used in the refining process, SiC is used, the total amount of calcium carbide is 0.2-0.4% kg / t, steel moisture is diffused and deoxidized in 3-5 batches, and the white slag time is guaranteed to be ≥ 15 minutes; Ar blowing pressure is 0.30-0.40 Mpa, the flow rate is 50~110L / min, and the time is ≥30min.

[0018] Vacuum degassing process: vacuum degree below 0.8 mbar, vacuum treatment for 15-30 minutes, after the vacuum-breaking vacuum treatment, soft blowing time for 10-30 minutes to promote the floating of inclusions, and the tapping temperature is controlled at 1450 °C.

[0019] Continuous casting process: liquidus temperature: 1350°C, superheat: 25-30°C, re-slip rate: 30%.

[0020] Slow cooling process: the steel is put into the slow cooling pit, the slow cooling time is 24 h...

Embodiment 2

[0025] Electric furnace smelting process: Hongbao slag-free tapping, so that after tapping, C≥0.05%, P≤0.010%, S≤0.020%, fixed oxygen: [O]≤600ppm.

[0026] LF refining process: Aluminum deoxidation is used in the refining process, SiC is used, the total amount of calcium carbide is 0.2-0.4% kg / t, steel moisture is diffused and deoxidized in 3-5 batches, and the white slag time is guaranteed to be ≥ 15 minutes; Ar blowing pressure is 0.30-0.40 Mpa, the flow rate is 50~110L / min, and the time is ≥30min.

[0027] Vacuum degassing process: vacuum degree below 0.8 mbar, vacuum treatment for 15-30 minutes, after the vacuum-breaking vacuum treatment, soft blowing time for 10-30 minutes to promote the floating of inclusions, and the tapping temperature is controlled at 1480°C.

[0028] Continuous casting process: liquidus temperature: 1350°C, superheat: 25-30°C, re-slip rate: 30%.

[0029] Slow cooling process: the steel is put into the slow cooling pit, the slow cooling time is 30h, ...

Embodiment 3

[0034] Electric furnace smelting process: Hongbao slag-free tapping, so that after tapping, C≥0.05%, P≤0.010%, S≤0.020%, fixed oxygen: [O]≤600ppm.

[0035] LF refining process: Aluminum deoxidation is used in the refining process, SiC is used, the total amount of calcium carbide is 0.2-0.4% kg / t, steel moisture is diffused and deoxidized in 3-5 batches, and the white slag time is guaranteed to be ≥ 15 minutes; Ar blowing pressure is 0.30-0.40 Mpa, the flow rate is 50~110L / min, and the time is ≥30min.

[0036] Vacuum degassing process: vacuum degree below 0.8 mbar, vacuum treatment for 15-30 minutes, after the vacuum-breaking vacuum treatment, soft blowing time for 10-30 minutes to promote the floating of inclusions, and the tapping temperature is controlled at 1500 °C.

[0037] Continuous casting process: liquidus temperature: 1350°C, superheat: 25-30°C, re-slip rate: 30%.

[0038] Slow cooling process: the steel is put into the slow cooling pit, the slow cooling time is 36 h...

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Abstract

The invention discloses 65Si2CrVA spring steel and a production process thereof. The 65Si2CrVA spring steel comprises the following components in percentage by weight: 0.52-0.60% of C, 1.40-2.00% of Si, 0.70-1.00% of Mn, not greater than 0.025% of P, not greater than 0.025% of S, 0.15-0.35% of Cr, not greater than 0.10% of Ni, not greater than 0.25% of Cu, and the balance Fe and inevitable impurities. The production process comprises the following procedures: electric furnace smelting, LF refining, vacuum degassing, continuous casting, slow cooling, bar rolling, heat treatment, fine inspection, performance detection, and packaging and warehousing. The 65Si2CrVA spring steel disclosed by the invention has the characteristics of a small decarburization tendency, high tempering stability, high hot workability, excellent performance after heat treatment, and the like; and the spring steel has high cold workability under an air-cooling condition after round steel rolling, has high plasticity and toughness during cold working, and reduces a hot working cost.

Description

technical field [0001] The invention relates to the field of spring steel, in particular to a 65Si2CrVA spring steel and a production process thereof. Background technique [0002] A spring is a mechanical part that uses elasticity to work. Parts made of elastic materials are deformed under the action of external force, and return to their original shape after the external force is removed. Also known as "spring". Spring is an important component of mechanization and automation, and is widely used in aerospace, machinery manufacturing, transportation, instrumentation and other industries. Generally made of spring steel. [0003] Spring steel 65Si2CrVA has low content of alloying elements, small 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, in the production of spring steel,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/18C22C38/08C22C38/16C21D8/06C21D6/00
CPCC22C38/02C21D6/008C21D8/065C21D2211/005C21D2211/009C22C38/04C22C38/08C22C38/16C22C38/18
Inventor 余昌国李红杰
Owner ANHUI HONGQIAO METAL MFG
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