Non-quenched and tempered steel for hydraulic rod of high-pressure oil cylinder and production method thereof
A technology of non-quenched and tempered steel and its production method, which is applied in the field of non-quenched and tempered steel for hydraulic rods of high-pressure oil cylinders and its production field, and can solve problems such as machine crashes, heavy objects falling, and oil leakage
Active Publication Date: 2021-05-04
SHIJIAZHUANG IRON & STEEL
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Problems solved by technology
If the hydraulic cylinder rod has surface defects such as hairlines, it is easy to leak oil, which will cause the pressure relief of the hydraulic cylinder when it is working, and the sudden fall of the heavy lifting object, resulting in a vicious accident of machine crash and death.
Method used
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Embodiment 1－8
[0025] Embodiment 1-8: The process flow of the production method of the non-quenched and tempered steel for the hydraulic rod of the high-pressure oil cylinder is: electric furnace or converter smelting→LF refining→VD degassing→continuous casting→slab cooling→slab heating→rolling→steel Cooling→finishing. Each process technology is as follows:
[0026] (1) Electric furnace or converter smelting process: control end point C ≥ 0.10%, adopt tapping and adding Al for pre-deoxidation, and the addition amount is 1-3kg / t. Add pre-melted refining slag 300±30kg / furnace and stir with bottom blowing argon to form slag in advance.
[0027] (2) LF refining process: Bottom blowing of argon gas in a large amount, rapid slag formation with high current, to ensure the formation of white slag within 10 minutes and to remove deoxidized inclusions of steel grades as soon as possible. After refining for 20 to 25 minutes, switch bottom blowing nitrogen to increase N, and analyze the N content in t...
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Abstract
The invention discloses a non-quenched and tempered steel for a hydraulic rod of a high-pressure oil cylinder and a production method thereof. Its chemical composition and mass percentage are: C 0.40%-0.58%, Si 0.17%-0.37%, Mn 0.70%-1.40% , V 0.03%~0.20%, Cr 0.05%~0.25%, Ti 0.005%~0.040%, N 0.007%~0.015%, Al 0.005%~0.050%, S≤0.035%, P≤0.035%, the rest are Fe and unavoidable impurities. This non-quenched and tempered steel achieves a reasonable match of strength and toughness under the principle of the lowest cost through component design, and at the same time meets the requirements of induction quenching and hardening on the surface of the high-pressure oil cylinder rod; this non-quenched and tempered steel has high plasticity, toughness, good surface, Subcutaneous quality and surface induction hardening performance, and low manufacturing cost, suitable for the production of high-pressure cylinder hydraulic rods. This method produces steel for high-pressure oil cylinder rods without quenching and tempering treatment through micro-alloying component design and controlled rolling and controlled cooling production methods, which simplifies the production process, saves equipment, and has the characteristics of saving materials, energy and reducing production costs. .
Description
technical field [0001] The invention relates to a non-quenched and tempered steel and a production method thereof, in particular to a non-quenched and tempered steel for a hydraulic rod of a high-pressure oil cylinder and a production method thereof. Background technique [0002] Quenching and tempering 45# and 40Cr steel are mostly used in traditional high-pressure cylinder rods for construction machinery. The quenching and tempering process is complex, prone to quenching defects, high energy consumption, heavy pollution, long production cycle, and high cost. [0003] The working conditions and forces of the high-pressure cylinder rod are complex, and the harsh service conditions determine that the high-pressure cylinder rod must have high hardness and wear resistance, and at the same time be able to withstand sudden impact. If there are surface defects such as hairlines on the hydraulic cylinder rod, it is easy to leak oil, which will cause the hydraulic cylinder to releas...
Claims
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IPC IPC(8): C22C38/02C22C38/04C22C38/24C22C38/28C22C38/06C22C33/04C21C7/10C21C7/06C21C7/00
CPCC21C7/0056C21C7/06C21C7/10C22C33/04C22C38/001C22C38/02C22C38/04C22C38/06C22C38/24C22C38/28
Inventor 郝彦英白素宏刘献达戴观文孙晓明刘勇刘运娜郑朝辉吕永年华祺年
Owner SHIJIAZHUANG IRON & STEEL