A kind of high-strength wear-resistant steel and its preparation method
A technology of high-strength wear-resistant steel and blast furnace molten iron, which is applied in the field of alloy structural steel, can solve problems such as easy deformation and low yield strength, and achieve the effects of high production efficiency, easy control of composition, and improved service life
Active Publication Date: 2020-10-27
NANJING IRON & STEEL CO LTD
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Problems solved by technology
The microstructure obtained by the patented technology after water toughening treatment at 950-1050°C is full austenite. Although the tensile strength is greater than 700MPa, the yield strength is low, and it is easy to deform during use, so it cannot be used to manufacture excavator shovels. Teeth, especially the shovel teeth of large mining excavators require high yield strength and good wear resistance
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Embodiment Construction
[0032]Below, eight batches of steel plates are smelted and rolled and heat-treated to further describe the present invention in detail.
[0033] Specifically, according to the chemical element composition, mass percentage and production method requirements of the present invention, five batches of steel plates were prepared, namely Examples 1-5. At the same time, in order to verify the effects of various chemical components and mass percentages, as well as the temperature and time range during rolling and heat treatment on performance and service life, three batches of steel plates were also prepared as comparative examples, namely comparative examples 1-3 .
[0034] Wherein, the chemical component mass percentage content of Comparative Example 1 is not within the scope of the present invention, and the processing parameters of the preparation process are within the scope of the present invention; the chemical component mass percentage content of Comparative Example 2 is withi...
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Abstract
The invention discloses high-strength wear-resistant steel. The high-strength wear-resistant steel comprises, by weight percent, 0.41%-0.59% of C, 0.31%-0.58% of Si, 7.1%-8.9% of Mn, smaller than or equal to 0.018% of P, smaller than or equal to 0.01% of S, 0.25%-0.35% of Ti, 3.60%-5.60% of Cr, 0.10%-0.30% of Zr and the balance Fe and unavoidable impurities; and the microstructure of the steel iscomposed of 10%-20% austenite and tempered martensite. Meanwhile, the invention discloses a preparation method of the wear-resistant steel. The preparation method comprises the technological process of converter smelting, ladle furnace refining, die casting, forging, rolling, cooling after rolling and heat treating. The wear-resistant steel has the high yield strength and the excellent wear resistance. The service time of shovel teeth manufactured of the wear-resistant steel can reach 220 days or above.
Description
technical field [0001] The invention designs an alloy structural steel, and in particular relates to a high-strength wear-resistant steel and a preparation method thereof. Background technique [0002] Wear-resistant steel is widely used in the construction of wear-resistant structural parts such as mining machinery, ball mill liners, excavators, and railway frogs, and the annual demand is huge. Generally, the wear conditions are divided into two types: one is impact wear under high impact load, such as the wear between railway frogs and high-speed wheels; the other is medium and low load abrasive wear, such as excavator shovel teeth, etc. , the types of steel used in wear structural parts are quite different under different working conditions. Traditional excavator shovel teeth are usually made of low-alloy wear-resistant steel plates, which are manufactured by high-temperature quenching + low-temperature tempering. The microstructure is single tempered martensite, which h...
Claims
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IPC IPC(8): C22C38/02C22C38/38C22C38/28C21D8/02C21D1/18
CPCY02P10/20
Inventor 陈颜堂李东晖孙超党军
Owner NANJING IRON & STEEL CO LTD