High strength spring steel with excellent anti-fatigue property

An anti-fatigue and high-strength technology, applied in the field of alloy steel, can solve the problems of reducing the anti-fatigue performance of spring steel, low Si content, and limited improvement in the anti-fatigue performance of spring steel, and achieve good strength-toughness coordination and fatigue resistance The effect of excellent and excellent fatigue resistance

Inactive Publication Date: 2006-10-25
CENT IRON & STEEL RES INST
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Problems solved by technology

Although the idea of ​​reducing the C content (0.30-0.50%) in the spring steel is adopted in the Chinese patent ZL 01104026.2, it contains more precious elements Ni, Mo
The idea of ​​reducing the C content (0.34-0.43%) in the spring steel is also adopted in the Chinese patent ZL98113532.3, but at the same time the Si content (0.80-1.40%) in the

Method used

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Embodiment Construction

[0023] According to the above-mentioned designed chemical composition scope, 5 furnaces of the steel of the present invention and 3 furnaces of contrast steel were smelted on a 50kg vacuum induction furnace. In addition, 2 furnaces were taken from commercial spring steel produced in industry as contrast steel, and its specific chemical composition was as follows Table 1 shows. Wherein furnace number 1~5# is the steel of the present invention, furnace number 6~8# is comparative steel, furnace number 9# is the commercial steel 60Si2CrV commonly used at present, furnace number 10# is the commercial steel 60Si2Mn with the largest application amount at present. Molten steel is cast into ingots and forged into rods. The sample was normalized at 900°C for 30 minutes before processing, and then the sample was processed from a hot-rolled bar into a standard room temperature tensile sample (L 0 =5d 0 , d 0 =5mm), impact specimen (10mm×10mm×55mm), fatigue specimen (see Figure 1) blank...

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Abstract

The invention belongs to the steel alloy domain and is mainly fit for the high strength spring steel with excellent ability of resisting the tire wreck and the resisting draw intension keeping above 1800MPa. The element component (weight percent) of the steel: C 0.35-0.55%, Mn 0.40-0.70%, Si 1.70-2.50%, Cr 0.70-1.10%, V 0.05-0.20%, RE 0.005-0.10%, Ca 0.005-0.10%, Ca 0.0005_0.020%, P<0.020%, S<0.015%, O<0.015%, the remaining quantity is Fe and unavoidable impurity. The steel also contains the B 0.0005_0.0030%, Ti 0.01-0.10% or the Ni 0.01-1.50%. Compared to the existing technology, the invention has many merits such as the high resisting drag intension, the excellent resisting tire ability and the low cost.

Description

technical field [0001] The invention belongs to the field of alloy steel, and is mainly suitable for high-strength spring steel with a tensile strength above 1800 MPa and excellent fatigue resistance. Background technique [0002] In the prior art, the largest users of spring steel products are railway and automobile manufacturing industries. Due to the harsh working conditions of spring components, the requirements for spring steel are very strict. With the increasing speed of railways, the increase of load capacity and the lightweight and high performance of automobiles, new requirements are put forward for improving the load-bearing stress level of springs. However, as the stress level of the spring components increases, the fatigue resistance of the springs made of existing spring steel will be significantly reduced, which cannot meet the requirements. This requires improving the fatigue resistance of spring steel while increasing its strength level. [0003] In recen...

Claims

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Application Information

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IPC IPC(8): C22C38/24C22C38/28C22C38/46
Inventor 惠卫军董瀚翁宇庆王毛球时捷聂义宏
Owner CENT IRON & STEEL RES INST
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