Corrosion resistant spring steel with tensile strength of more than or equal to 2100 MPa and production method thereof
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A 2100mpa, tensile strength technology, used in low internal friction springs, springs/shock absorbers, mechanical equipment, etc., can solve the problems of no corrosion resistance, the tensile strength of spring steel has not been significantly improved, and achieve good The effect of corrosion resistance
Inactive Publication Date: 2019-06-14
MAANSHAN IRON & STEEL CO LTD
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However, the tensile strength of this spring steel has not been significantly improved compared with the strength of national standard 55SiCrV and other brands, and it does not have obvious corrosion resistance
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[0037] The present invention will be further described below in conjunction with embodiment. The described examples and their results are only for illustrating the invention, but should not and will not limit the invention as detailed in the claims.
[0038] Each embodiment of the present invention is all produced by following process:
[0039] (1) Conventional electric furnace or converter smelting: Oxygen is fixed before tapping, and slag is strictly controlled during tapping;
[0040] (2) Conventional refining furnace refining: C, Si, Cr, Mn, V, Nb, Ni, Cu, Re and other elements are adjusted to the target value;
[0041] (3) Vacuum degassing: the pure degassing time is ≥15 minutes, and the [H] content after vacuum treatment is guaranteed to be ≤1.5ppm;
[0042] (4) Continuous casting: control the target temperature of molten steel in the tundish to be 10-40°C above the liquidus temperature, and continuously cast 150mm×150mm-250mm×250mm billets;
[0043] (5) Wire rod roll...
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Abstract
The invention belongs to the field of spring steel and production methods thereof, and particularly relates to corrosion resistant spring steel with tensile strength of more than or equal to 2100 MPaand a production method thereof. The corrosion resistant spring steel comprises the following chemical components of, in percentage by weight, 0.57-0.63% of C, 1.50-2.00% of Si, 0.40-0.60% of Mn, 0.80-1.00% of Cr, 0.02-0.10% of V, 0.015-0.04% of Nb, 0.05-0.15% of Ni, 0.05-0.15% of Cu, 0.01-0.03% of Re, less than or equal to 0.015% of P trace, less than or equal to 0.015% of S trace, less than or equal to 0.0015% of O, less than or equal to 0.006% of N, less than or equal to 0.00015% of [H], and balance Fe and other inevitable impurities. The production method comprises the following steps of smelting, refining, vacuum degassing, continuous casting and wire rod rolling; and after the heat treatment, the tensile strength is 2100-2200 MPa, the grain size of the steel is larger than or equal to 10 grade, the elongation after fracture is larger than or equal to 12%, the cross-section shrinkage is larger than or equal to 42%, the fatigue resistance is larger than or equal to 850 MPa, and thecorrosion resistance is good.
Description
technical field [0001] The invention belongs to the field of spring steel and a production method thereof, in particular to a corrosion-resistant spring steel with a tensile strength ≥ 2100 MPa and a production method thereof. Background technique [0002] Spring steel is widely used in the manufacture of railways, automobiles, construction machinery and other machinery. With the increasing requirements for light weight and high performance of motor vehicles, the suspension springs supporting the vehicle body are also strengthened. Furthermore, domestic trains are speeding up and trucks are developing towards high speed and heavy loads, so there is an urgent need for bogie springs with high strength, light weight and long life. In addition, in some humid environments with high concentration of chloride ions, such as coastal environments, spring parts are required to have good corrosion resistance. [0003] However, while the coil springs used in automobile suspensions have ...
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