A heat treatment process for silicon-manganese alloy spring steel

A spring steel and alloy technology, which is applied in the field of heat treatment for silicon-manganese-based alloy spring steel, can solve the problems that silicon-manganese-based alloy spring steel cannot directly reach the finished state, affect quenching effect, and low cooling rate, and achieve excellent resistance to The effect of oxidation performance, suitable cooling rate and high thermal efficiency

Active Publication Date: 2018-06-01
陕西雷帕得悬架系统有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the silicon content is too high, it will lead to decarburization and graphitization tendency of steel during rolling and heat treatment
[0004] In the traditional heat treatment process of spring steel, ordinary quenching oil is commonly used as the quenching medium. This traditional oil medium quenching method has low cooling speed and low hardened thickness, high oil consumption, harsh working environment in the processing workshop, and slightly difficult operation. If you are not careful, it will cause fire hazards, which is not conducive to energy saving and environmental protection. Although the choice of water-soluble quenching fluid is more environmentally friendly, it often has too fast cooling speed, which is easy to crack the workpiece and consumes a lot of quenching fluid. It is difficult to keep the active ingredients reasonable for a long time. concentration, so as to affect the quenching effect
[0005] In addition, the silicon-manganese alloy spring steel after quenching cannot directly reach the finished product state, but also needs to be shot blasting and coated with anti-rust paint, which makes the production process of spring steel complicated and the finished product remains high.

Method used

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  • A heat treatment process for silicon-manganese alloy spring steel
  • A heat treatment process for silicon-manganese alloy spring steel
  • A heat treatment process for silicon-manganese alloy spring steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1) Material: 60Si2Mn steel, the chemical composition (Wt%) is shown in Table 1, which meets the standard requirements. Material specification 500mm X24mm X90mm, 500mmX 25mmX 90mm. The single-leaf spring weighs 20-25Kg, and the total weight of the test material is 100 tons.

[0040] C

Si

mn

S

Impurities

0.60

1.8

0.7

<0.035

According to standard requirements

[0041] 2) Put the workpiece into the electric furnace of fluidized graphite particles, heat it to 850±60°C, and keep it warm for 10-20 minutes.

[0042] Prepare the quenching liquid according to the following mass fraction ratio:

[0043] Phenothiazine (or N,N'-di-sec-butyl-p-phenylenediamine), 0.6%; triethanolamine, 1.5%; preservatives, 0.1%; methyl silicone oil, 0.2%; the rest: methoxypolyethylene diol.

[0044] The quenching liquid and liquid water are proportioned according to the ratio of mass fraction 2:8, and the solution temperature is 20°C. The maximu...

Embodiment 2

[0048] 1) Material: 60Si2Mn steel, the chemical composition (Wt%) is shown in Table 2, which meets the standard requirements. Material specification 500mmX20mmX90mm, 500mmX24mmX90mm, 500mmX25mmX90mm. The single leaf spring weighs 10-20Kg, and the total weight of the test material is 200 tons.

[0049] C

Si

mn

S

Impurities

0.58

2.0

0.65

<0.035

According to standard requirements

[0050] 2) Put the workpiece into the electric furnace of fluidized graphite particles, heat it to 850±60°C, and keep it warm for 10-20 minutes.

[0051] Prepare the quenching liquid according to the following mass fraction ratio:

[0052] Phenothiazine (or N,N'-di-sec-butyl-p-phenylenediamine), 0.61%; triethanolamine, 1.8%; preservatives, 0.2%; methyl silicone oil, 0.25%; diol.

[0053] The quenching liquid and liquid water are mixed according to the ratio of mass fraction 2.5:7.5, and the solution temperature is 35°C. The maximum cooling rate of...

Embodiment 3

[0057] 1) Material: 60Si2Mn steel, the chemical composition (Wt%) is shown in Table 2, which meets the standard requirements. Material specification 500mmX20mmX90mm, 500mmX24mmX90mm, 500mmX25mmX90mm. The single leaf spring weighs 10-20Kg, and the total weight of the test material is 200 tons.

[0058] C

Si

mn

S

Impurities

0.58

2.0

0.65

<0.035

According to standard requirements

[0059] 2) Put the workpiece into the electric furnace of fluidized graphite particles, heat it to 850±60°C, and keep it warm for 10-20 minutes.

[0060] Phenothiazine (or N,N'-di-sec-butyl-p-phenylenediamine), 0.65%; triethanolamine, 2.5%; preservatives, 0.35%; methyl silicone oil, 0.3%; diol.

[0061] The quenching liquid and liquid water are mixed according to the ratio of mass fraction 2.5:7.5, and the solution temperature is 35°C. The maximum cooling rate of the quenching liquid is 120°C / s. After the workpiece is heated to 850±60°C and releas...

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Abstract

The invention discloses a heat treatment process with regard to silicon-manganese alloy spring steel, and belongs to the technical field of heat treatment processes for spring steel. According to the invention, heat treatment steps comprising heating, quenching and tempering can be carried out with regard to the silicon-manganese alloy spring steel, and the heat treatment process is scientific and reasonable in design, and capable of effectively preventing the silicon-manganese alloy spring steel from decarburization and graphitization tendencies; a quenching liquid used in the heat treatment process is safe, environment-friendly and non-toxic, capable of effectively replacing the original oil-based quenching medium with high energy consumption and high pollution, long in service life, and excellent in quenching effect; and in addition, the silicon-manganese alloy spring steel treated through the process is capable of achieving a finished product state, and provided with a layer of anti-rust film, so that additional shot-blasting and painting processes are not needed, and the heat treatment process is more economic and convenient.

Description

technical field [0001] The invention belongs to the technical field of alloy spring steel heat treatment process, and in particular relates to a heat treatment process for silicon-manganese alloy spring steel. Background technique [0002] Spring steel refers to steel specially used to manufacture springs and elastic elements due to its elasticity in the quenched and tempered state. Alloy spring steel is based on carbon steel, by properly adding one or several alloying elements to improve the mechanical properties, hardenability and other properties of steel, so as to meet the steel required for the manufacture of various springs. For example, silicon-manganese alloy spring steel has high silicon content (up to 2.00%), which has the advantages of high strength, good elasticity, good tempering resistance and stability, and can be made into high-quality leaf springs for automobiles or other types Spring; but silicon-manganese alloy spring steel also has the disadvantages of e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/18C21D1/60
CPCC21D1/18C21D1/60
Inventor 孟宪芸秦立富王宁王德虎冷冰
Owner 陕西雷帕得悬架系统有限公司
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