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High-tenacity high-strength spring steel

A high-strength, spring steel technology, applied in the field of high-strength spring steel, can solve problems such as poor hydrogen embrittlement resistance, spring fracture failure, etc., and achieve high fatigue life and corrosion fatigue resistance

Active Publication Date: 2014-04-16
ZHEJIANG MEILI HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(For example, in cold areas where snow melting agents are often used on the road) Due to the poor resistance to hydrogen embrittlement of the material, the early fracture failure of the spring is often caused by corrosion fatigue

Method used

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  • High-tenacity high-strength spring steel
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  • High-tenacity high-strength spring steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The steel of the present invention of the ML1900 brand of smelting the following components is annealed after hot rolling and polished into silver bright steel of Φ15.8mm.

[0041] C0.39, Si1.75, Mn0.64, P≤0.006, S≤0.003, Cr0.73, Ni0.22, Cu0.23, V0.06, Ti0.049, and the rest are Fe and impurity elements.

[0042] The test results of non-metallic inclusions in steel are as follows:

[0043]

[0044] The mechanical properties of the steel after heat treatment are as follows:

[0045]

[0046] Note: The heat treatment process of the sample: quenching temperature 890 ℃ heat preservation 30min oil quenching, 300 ℃ tempering 150min water cooling.

[0047] The grain size of the annealed steel after hot rolling is 8.0-7.0. Grain size after heat treatment ≥ 8.0.

Embodiment 2

[0049] The steel of the present invention of the ML1900 brand of smelting the following components is annealed after hot rolling and polished into a silver bright steel of Φ14.0mm.

[0050] C0.35, Si2.05, Mn0.95, P≤0.020, S≤0.014, Cr0.56, Ni0.18, Cu0.10, V0.090, Ti0.035, and the rest are Fe and impurity elements.

[0051] The test results of non-metallic inclusions in steel are as follows:

[0052]

[0053] The mechanical properties of the steel after heat treatment are as follows:

[0054]

[0055] Note: The heat treatment process of the sample: quenching temperature 900 ℃ heat preservation 30min oil quenching, 320 ℃ tempering 150min water cooling.

[0056] The grain size of the annealed steel after hot rolling is 8.0-7.0. Grain size after heat treatment ≥ 8.0.

Embodiment 3

[0058] The steel of the present invention of the ML1900 brand of smelting the following components is annealed after hot rolling and polished into silver bright steel of Φ16.8mm.

[0059] C0.48, Si1.89, Mn0.95, P≤0.010, S≤0.005, Cr0.80, Ni0.45, Cu0.28, V0.045, Ti0.089, and the rest are Fe and impurity elements.

[0060] The test results of non-metallic inclusions in steel are as follows:

[0061]

[0062] The mechanical properties of the steel after heat treatment are as follows:

[0063]

[0064] Note: The heat treatment process of the sample: quenching temperature 890 ° C for 30 min oil quenching, tempering at 330 ° C for 150 min water cooling.

[0065] The grain size of the annealed steel after hot rolling is 8.0-7.0. Grain size after heat treatment ≥ 8.0.

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PUM

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Abstract

The invention discloses high-tenacity high-strength spring steel which is characterized by comprising the following chemical components in percentage by weight: 0.35-0.50% of C, 1.50-2.50% of Si, 0.35-1.00% of Mn, less than or equal to 0.025% of P, less than or equal to 0.015% of S, 0.50-1.20% of Cr, 0.15-0.50% of Ni, 0.10-0.30% of Cu, 0.04-0.10% of V, 0.03-0.10% of Ti and the balance of Fe and other inevitable impurities. The spring steel is smelted through an electric furnace or rotary furnace, an external refining technology is adopted to control the contents of gas and impurities, the gas O in the steel is less than or equal to 12ppm, H is less than or equal to 1.5ppm, N is less than or equal to 60ppm, the fine system of each of levels A, B, C and D of non-metallic inclusions is less than or equal to 1.5, and the rough system is less than or equal to 1.0. The grain size of the material after heat treatment is more than or equal to 8.0; the reduction of area Z is more than or equal to 40% and the percentage elongation after fracture is more than or equal to 10% when the tensile strength is more than 1920MPa; a prepared spring has excellent corrosion and fatigue resistance, and the steel can be prepared into high-fatigue-strength springs of which the maximum design shear stress is 1180MPa.

Description

technical field [0001] The invention relates to a high-strength spring steel with excellent corrosion resistance, in particular to a material whose plasticity and toughness can still reach a high level when the tensile strength reaches above 1920 MPa and which has a strong resistance to hydrogen embrittlement so that the corrosion fatigue of the spring can be reduced. High-strength spring steel suitable for vehicles with improved service life. Background technique [0002] Spring steel is widely used in machinery manufacturing such as railways, automobiles, and construction machinery. Automobile manufacturing and railway vehicles are the largest users of spring steel. Due to the harsh working conditions of spring parts, the requirements for spring steel must be extremely strict. [0003] In recent years, with the prominent environmental problems such as global warming, in order to limit energy consumption and reduce carbon dioxide emissions, the weight reduction of automob...

Claims

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Application Information

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IPC IPC(8): C22C38/50
Inventor 屠世润
Owner ZHEJIANG MEILI HIGH TECH
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