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Medium carbon non-quenched and tempered steel and its preparation process and connecting rod and its preparation process
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A technology of non-quenched and tempered steel and preparation process, applied in the field of non-quenched and tempered steel, can solve the problems affecting the fatigue performance of parts, high content of microalloying elements, low fatigue performance, etc., and achieve excellent bursting performance and fatigue resistance Effect
Active Publication Date: 2021-07-20
BAOSTEEL SPECIAL STEEL SHAOGUAN CO LTD
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[0003] The traditionally used steel for breaking connecting rods is high-carbon steel SAE1070 or C70S6 developed on the basis of 0.70% carbon steel. Its structure is pearlite plus a small amount of intermittent ferrite. Although it is easy to brittle crack, it still has obvious Disadvantages: low yield ratio, low fatigue performance
In addition, more hard phase cementite makes machinability poorer
The literature [Denji Steel (Japanese), 2000, 71 (1): 81-87] introduces a non-quenched and tempered steel for medium carbon expansion connecting rods, which has good expansion properties, but due to the addition of up to 0.25% The microalloying element V increases the cost of steel, thereby weakening the economy of the steel; too high Si content (2%) also deteriorates the surface quality of forgings and affects the fatigue performance of parts; in addition, in order to improve cutting Machinability, the addition of about 0.1% of harmful element Pb in the steel is not conducive to environmental protection, all of which limit the application of the steel
The literature [Heat Treatment (Japanese), 2007, 47(6): 343-349] also introduced a kind of non-quenched and tempered steel for medium carbon expandable connecting rods. Due to the low carbon content (0.28%), the main effect of adding The content of microalloying elements for precipitation strengthening is too high (0.17%V+0.17%V), which makes the steel less economical
A medium-carbon non-quenched and tempered steel with good machinability and bursting properties proposed by the Japanese patent can be used to manufacture bursting connecting rods, but the S content in the steel is too high (0.15-0.30%), which makes the smelting of the steel special The continuous casting is difficult and the hot workability of the steel is poor, which limits the application of the steel in mass industrial production
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[0043] The preparation process of the link in this application includes: heating, forging, and cooling in the medium carbon non-injection molding.
[0044] Heating process. The medium carbon non-injured steel is heated under the conditions of 1150-1250 ° C, in some embodiments of the present application, the medium carbon non-tuning steel sheet is subjected to the length of the rod blank, such as 230 mm ± 5mm, medium frequency heating Heating, heating rhythm is controlled by 30S.
[0045] Forging process. The forging process in this application includes roll forging blank, precangling, final forging, punching, cutting edge, and thermal correction processes, no less than 950 ° C. The specific forging processes described above are general techniques in the art, and the present application is not limited.
[0046] Cooling process. The cooling process has a large impact on the ferrite content and hardness of the connecting rod. In some embodiments of the present application, the forge...
Embodiment 1
[0050] This embodiment provides a medium carbon non-tuning steel and a link, mainly by the following steps:
[0051] The ingredients of the medium carbon non-touched steel include: C: 0.45%, Si: 0.63%, Mn: 1.15%, P: 0.023%, S: 0.045%, Cr: 0.26%, MO: 0.03%, V: 0.13%, Ni: 0.18%, Cu: 0.20%, N: 0.031%, N: 0.0178%, Al ≤ 0.030%, and the rest is Fe and other inevitable impurities. The brittle value of carbon non-tuning steel K = Ceq + 10P + 5Cu = 2.39.
[0052]The converter smelting, LF furnace refining, RH furnace vacuum degassing, RH furnace is vacuum degassing, RH furnace. Do not feed the AL line during the LF furnace refining process, and the calcium line is not fed during the RH furnace vacuum degassing. The continuous casting is pouring, the water temperature is about 1520 ° C, and the steel overheat is controlled at 20-30 ° C, the current parameter of the crystallizer is 630A / 2.5 Hz, the terminal electromagnetic stirring current parameter is 650A / 4HZ. During the rolling proces...
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Abstract
The application relates to a medium-carbon non-quenched and tempered steel and its preparation process, a connecting rod and its preparation process, and belongs to the technical field of non-quenched and tempered steel. This application improves and regulates the composition and content of medium-carbon non-quenched and tempered steel, and limits the range of brittleness value K of medium-carbon non-quenched and tempered steel through carbon equivalent value, phosphorus content and copper content, so that medium-carbon non-quenched and tempered steel Quenched and tempered steel has low plasticity, excellent bursting performance and fatigue performance, and is mainly suitable for making bursting connecting rods with a tensile strength above 1000Mpa. This application limits the ferrite content in medium-carbon non-quenched and tempered steel to ≤25%, and the ferrite grain size is ≥5 grades, and provides the preparation process of the above-mentioned medium-carbon non-quenched and tempered steel, so that the obtained medium-carbon Non-quenched and tempered steel yield strength ≥ 750MPa, tensile strength ≥ 1000MPa, elongation after fracture ≥ 8%, reduction of area ≥ 25%, as-rolled hardness ≤ 290HBW.
Description
Technical field [0001] The present application relates to the technical field of non-tangible steel, and more particularly to a medium carbon non-tangled steel and its preparation process and a link thereof and a preparation process thereof. Background technique [0002] The traditional automotive engine connecting rod is complex, high precision requirements, often affect the engine reliability because of processing accuracy. The expansion link technology developed in recent years solves this problem. The process is designed and prefabricated (crack grooves) in a proper position of the connecting rod, and forms a stress concentration, and then applies the load of the load until the predetermined breaking surface. When satisfying the crisp break, there is almost no plastics deformation, the bobbin and the linkage cover of the link body and the link cover are realized at the gap. Due to the natural state of dog teeth, there is extremely high positioning and mating accuracy, no need...
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Application Information
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