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Spring steel used for automobile suspension as well as preparation method and application thereof

A technology of automobile suspension and spring steel, which is applied in the field of spring steel for automobile suspension and its preparation, and can solve the problems that the quality, variety and specification of spring steel wire cannot meet user requirements, etc.

Active Publication Date: 2013-11-27
GUANGZHOU ORSA WIRE SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The annual demand of spring steel wire materials for automobiles is about 150,000 tons, but the quality, variety and specifications of domestic spring steel wires cannot meet the requirements of users, especially the suspension spring steel materials with high requirements for supporting cars need to be imported from abroad; The main importing countries are Japan, South Korea, Sweden, Germany and the United Kingdom, etc.

Method used

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  • Spring steel used for automobile suspension as well as preparation method and application thereof
  • Spring steel used for automobile suspension as well as preparation method and application thereof
  • Spring steel used for automobile suspension as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] Embodiment 1: the preparation of spring steel (method A)

[0087] 1. Production process:

[0088] Hot metal pretreatment-converter-furnace refining-continuous casting to 300mm×400mm blooms-flame cleaning the surface of blooms-begin rolling to 160mm×160mm billets-flaw detection-skinning-heating-continuous rolling with controlled cooling 12mm disc Strip-Take-up-Check-Packing.

[0089] 2. Preparation steps

[0090] (1) Adopt conventional method to carry out molten iron pretreatment, pour into converter steelmaking after sloughing part P, S, Si molten iron;

[0091] (2) Molten iron accounts for 90%, clean steel scrap accounts for 10%, metal Ni, Cu and Mo-Fe alloy, lime (CaO) and fluorite are added at the same time, when the C content in molten steel reaches about 0.80%, and the alkalinity is above 2.0, [P]≤0.010%, [S]≤0.010%, when the molten steel temperature is 1550~1570℃, the molten steel is poured into the ladle. Enter the LF refining furnace for refining.

[0092] ...

Embodiment 2

[0103] Embodiment 2: the preparation of spring steel (method A)

[0104] The production process is the same as in Example 1.

[0105] Preparation steps:

[0106] (1) Adopt conventional method to carry out molten iron pretreatment, pour into converter steelmaking after sloughing part P, S, Si molten iron;

[0107] (2) Molten iron accounts for 90%, clean steel scrap accounts for 10%, metal Ni, Cu and Mo-Fe alloy, lime (CaO) and fluorite are added at the same time, when the C content in molten steel reaches about 0.80%, and the alkalinity is above 2.0, [P]≤0.010%, [S]≤0.010%, when the molten steel temperature is 1570~1590℃, the molten steel is poured into the ladle. Enter the LF refining furnace for refining.

[0108] (3) The main task in the oxidation period of the LF refining furnace is to reduce C and adjust the temperature of molten steel; the main task in the reduction period is to deoxidize and alloy, when [C], [Ni], [Cu], [Mo], [P ], [S] and other components reach the ...

Embodiment 3

[0118] Embodiment 3: the preparation of spring steel wire

[0119] Production process: Φ12mm wire rod pay-off-shot peening-flaw detection-grinding-drawing to Φ11mm-pay-off-intermediate frequency+high frequency induction heating-water quenching-intermediate frequency induction tempering-flaw detection-wire take-up-inspection-packaging-in library.

[0120] Concrete preparation steps are as follows:

[0121] (1) After the Φ12mm wire rod is unwound, it enters the straight wire shot peening machine for shot peening. The line speed is 40-50m / min. Oxidized iron scale on the surface of the wire.

[0122] (2) After shot peening, the wire rod is drawn into a Φ11mm steel wire by an inverted drawing machine with a diameter of 1200mm, and the area reduction rate of each pass is 16%.

[0123] (3) The 11.0mm steel wire is paid off, and the temperature of the heated steel wire reaches 950-970°C through medium frequency + high frequency two-stage induction heating. 20n / min, and then the st...

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Abstract

The invention provides a spring steel used for an automobile suspension. the spring steel comprises the following ingredients in percentage by weight: 0.46-0.56% of C, 0.90-1.20% of Si, 0.80-1.20% of Mn, less than or equal to 0.020% of P, less than or equal to 0.020% of S, 0.70-1.0% of Cr, 0.90-1.50% of Ni, 0.60-0.90% of Mo, 0.50-0.80% of Cu, 0.02-0.07% of RE and the balance of Fe and inevitable impurities. The invention also provides a preparation method for the spring steel and a method for preparing a spring steel wire by using the spring steel. According to the invention, the chemical components of the spring steel are reasonably designed, and the smelting rolling and steel wire preparation method and the auxiliary material adding method and proportion are improved. Compared with the existing 55SiCr steel, the tensile strength of the spring steel disclosed by the invention is improved by 400MPa, the working stress is improved by 200MPa, and the fatigue life is improved by 200 thousand times.

Description

technical field [0001] The invention relates to a black alloy material, in particular to a spring steel for automobile suspension and its preparation method and application. Background technique [0002] Suspension springs are subjected to high-frequency reciprocating compression movements during the driving process of the car, and play a role in buffering and shock absorption. The quality of the suspension spring plays a vital role in the stability and safety of the vehicle. Cars and passenger cars have high requirements on the performance of suspension springs, which need to meet the requirements of reducing noise, improving comfort and stability. The technical development trend of suspension springs is generally towards lightweight, high stress, and high reliability. The design stress requirements of suspension springs are greater than 1000MPa, and the highest can reach 1200MPa. [0003] Suspension springs used in the automotive industry are divided into two categories: ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/44C22C33/04C21D8/06
CPCY02P10/20
Inventor 陶善龙邢献强
Owner GUANGZHOU ORSA WIRE SCI & TECH
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