High-strength bolting steel and preparation method thereof
A high-strength bolt and bolt steel technology, applied in the metal field, can solve problems such as equipment failure, bending deformation of the upper ceramic column, etc.
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[0040] The application also provides a method for preparing the above-mentioned bolt steel, comprising the following steps:
[0041] 1) Cast bolt steel ingots with the following composition: 0.05wt% to 0.5wt% of rare earth elements, 0.35wt% to 0.45wt% of carbon, 1.2wt% to 1.8wt% of chromium, 0.17wt% to 0.37wt% of silicon, 0.4wt%-0.8wt% molybdenum, 0.2wt%-0.4wt% vanadium, 0-0.005wt% niobium and the rest iron; the rare earth element is one or both of lanthanum and cerium;
[0042] 2) Forging the bolt steel ingot, and annealing the forged bolt steel ingot;
[0043] 3) Quenching the bolt steel ingot obtained in step 2), and tempering the quenched bolt steel to obtain high-strength bolt steel.
[0044] In the process of preparing the bolt steel, the applicant first casts the bolt steel ingot, and then forges the prepared bolt steel ingot so that the internal structure of the bolt ingot is fully broken, and the annealing treatment after forging is to eliminate the residual stress i...
Embodiment 1
[0056] The composition weight percent of the bolt steel in this embodiment is as follows: 0.12% Ce, 0.37% C, 1.2% Cr, 0.25% Si, 0.5% Mo, 0.3% V, 0.0048% Nb, and the rest is Fe .
[0057] The preparation method of the bolt steel is as follows: 1) batching according to the above weight percentage; 2) using a vacuum induction furnace to melt at 1560 °C for 40 minutes, holding it for 25 minutes, sampling and casting, and preparing alloy steel; 3) remelting the prepared alloy steel, Add Ce components and cast to form a steel ingot; 4) Hot-roll the steel ingot at 1150°C for the steel ingot obtained in step 3). After obtaining the hot-rolled rod, forge it at 900°C, and slowly cool the forged steel ingot to room temperature before annealing , the annealing temperature is 650°C, and the holding time is 2 hours; 5) The material obtained in step 4) is quenched at 820°C for 1 hour, then tempered at 500°C for 60 minutes, and air-cooled to room temperature , to get bolt steel. Performance...
Embodiment 2
[0061] The composition weight percentage of bolt steel in this embodiment is as follows: 0.06% La, 0.08% Ce, 0.42% C, 1.6% Cr, 0.32% Si, 0.72% Mo, 0.28% V, 0.0045% Nb , and the rest is Fe.
[0062] The preparation method of the bolt steel is as follows: 1) batching according to the above weight percentage; 2) using a vacuum induction furnace to melt at 1540 ° C for 40 minutes, holding it for 20 minutes, sampling and casting, and preparing alloy steel; 3) remelting the prepared alloy steel, adding Y component, casting to form a steel ingot; 4) Hot rolling the steel ingot at 1150°C for the steel ingot obtained in step 3). The annealing temperature is 680°C, and the holding time is 2.5 hours; 5) The material obtained in step 4) is quenched at 830°C, and the quenching holding time is 70 minutes, and then tempered at 520°C, the tempering time is 70 minutes, and air-cooled to At room temperature, the bolt steel is obtained. Performance tests were performed on the bolt steel prepar...
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