High-hardenability long-fatigue-life low-temperature-resistant spring flat steel and production method thereof
A technology with fatigue life and high hardenability, applied in the field of long steel products and their production methods, can solve the problems of difficult large-scale production and promotion, low efficiency, high cost, etc., and achieve the effect of low production cost and simple production process
Active Publication Date: 2022-01-14
武汉钢铁有限公司
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Problems solved by technology
The invention steel is prepared by powder metallurgy method, which has low efficiency and high cost, and is difficult to produce and popularize on a large scale
Method used
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Embodiment 1～10
[0046] The production process of high hardenability and high fatigue life low temperature resistant spring flat steel described in embodiments 1 to 10 is carried out according to the following steps:
[0047] (1) KR desulfurization: adopt the composite KR desulfurization method, stir the molten iron in the molten iron ladle to form a vortex, add desulfurizer active lime and magnesium powder twice successively, reduce the S content of the molten iron, and control the sulfur content of the molten iron out of the station [S] ≤ 0.01 %;
[0048] (2) Ladle heating: the ladle is covered and heated by electromagnetic induction to ensure that the temperature of the molten iron is ≥1490°C during the process of transporting the molten iron from the ironworks to the steelworks;
[0049] (3) For converter smelting, the control of the end point C is ≥0.06-0.40%; the tapping temperature is ≥1630°C;
[0050] (4) RH vacuum treatment, vacuum degree ≤ 100Pa, keeping vacuum time not less than 20...
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Abstract
The invention discloses high-hardenability long-fatigue-life low-temperature-resistant spring flat steel. The high-hardenability long-fatigue-life low-temperature-resistant spring flat steel comprises the following chemical components in percentage by weight: 0.50-0.65wt% of C, 0.40-0.90wt% of Si, 0.80-1.50wt% of Mn, less than or equal to 0.025wt% of P, less than or equal to 0.025wt% of S, 0.50-1.25wt% of Cr, 0.10-0.40wt% of Ni, 0.05-0.08wt% of Ti, 0.002-0.006wt% of B, 0.002-0.009wt% of Zr, less than or equal to 0.0045wt% of N, less than or equal to 0.00012wt% of H, less than or equal to 0.0011wt% of O, 0.10-0.65wt% of Mo, and the balance Fe and inevitable impurities. Through innovation of components and a process, the spring flat steel is developed, wherein ReL is greater than or equal to 1750MPa, Rm is greater than or equal to 1950MPa, A is greater than or equal to 10%, Z is greater than or equal to 36%, and hardenability J25 is greater than or equal to 58HRC; and fatigue life of a steel plate spring reaches 150,000 times or more under the highest design stress of 1050MPa, and KV2 at -60 DEG C is greater than or equal to 35J.
Description
technical field [0001] The invention relates to a long iron and steel product and a production method thereof, belonging to the field of iron and steel metallurgy production and manufacturing, in particular to a low-temperature-resistant spring flat steel with high hardenability and high fatigue life and a production method thereof. Background technique [0002] The lightweight of automobiles inevitably requires the lightweight of auto parts. The use of high-strength spring flat steel for heavy-duty vehicles can reduce 30% to 50% of the mass of the leaf spring assembly itself, and reduce the total weight of the leaf spring by increasing the thickness of each piece of flat steel and reducing the total number of assembled pieces, so as to achieve auto parts. for lightweight purposes. The current technical path is: multi-leaf spring→less leaf spring→single-leaf spring. [0003] On the one hand, the spring flat steel must be used after quenching + tempering heat treatment. As ...
Claims
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IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/50C22C38/54C21D1/18C21D6/00C21D8/02C22C33/06
CPCC22C38/02C22C38/04C22C38/50C22C38/54C22C38/001C22C38/44C22C33/06C21D1/18C21D6/004C21D6/005C21D6/008C21D8/0205C21D8/0221C21D8/0247C21D2211/009
Inventor 丁礼权张帆王彦林任安超鲁修宇
Owner 武汉钢铁有限公司