Ultrahigh-strength locking riveting rivet cold heading steel wire rod and preparing method thereof
An ultra-high-strength, cold-heading steel technology, which is applied in the field of cold-heading steel wire rods for ultra-high-strength locking rivets and its preparation, can solve the problems of inability to produce ultra-high-strength rivets, difficulty in ensuring hardness, and delayed fracture resistance of wire rods It cannot meet the production requirements of lock rivets and other problems, and achieve the effect of avoiding abnormal quenching structure, inhibiting the growth of grains, and avoiding excessive coarseness
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Embodiment 1
[0038] The embodiment of the present invention provides a cold heading steel wire rod for ultra-high strength locking rivets, the composition of which is: C 0.33%, Mn 1.10%, Si 0.24%, P 0.020%, S 0.005%, Cr 0.30%, Nb 0.030%, Al 0.023%, Ti0.020%, B 0.0020%, and the rest are iron and unavoidable impurity elements.
[0039] The preparation steps of the cold heading steel wire rod for the above-mentioned ultra-high-strength locking rivets are as follows:
[0040] (1) The molten steel smelted by the converter is refined outside the LF furnace and then subjected to RH vacuum refining. The vacuum degree of the vacuum tank in the RH process is 70pa, and the pure degassing time of the RH refining is 20min. The molten steel refined by RH is prepared into a bloom through the continuous casting process.
[0041] (2) After blooming the bloom obtained in step (1), place the hot-rolled billet in a slow cooling pit for 48 hours;
[0042] (3) Steel slab heating: heat the hot-rolled slab after...
Embodiment 2
[0045] The embodiment of the present invention provides a cold heading steel wire rod for ultra-high strength locking rivets, the composition of which is: C 0.35%, Mn 0.95%, Si 0.17%, P 0.012%, S 0.010%, Cr 0.20%, Nb 0.020%, Al 0.041%, Ti0.027%, B 0.0022%, and the rest are iron and unavoidable impurity elements.
[0046] The preparation steps of the cold heading steel wire rod for the above-mentioned ultra-high-strength locking rivets are as follows:
[0047] (1) The molten steel smelted by the converter is refined outside the LF furnace and then subjected to RH vacuum refining. The vacuum degree of the vacuum tank in the RH process is 67pa, and the pure degassing time of the RH refining is 15 minutes. The molten steel refined by RH is prepared into a bloom through the continuous casting process.
[0048] (2) After blooming the bloom obtained in step (1), place the hot-rolled billet in a slow cooling pit for 49 hours;
[0049] (3) Steel slab heating: heat the hot-rolled slab ...
Embodiment 3
[0052] The embodiment of the present invention provides a cold heading steel wire rod for ultra-high strength locking rivets, the composition of which is: C 0.38%, Mn 0.87%, Si 0.01%, P 0.009%, S 0.008%, Cr 0.27%, Nb 0.035%, Al 0.033%, Ti0.034%, B 0.0010%, and the rest are iron and unavoidable impurity elements.
[0053] The preparation steps of the cold heading steel wire rod for the above-mentioned ultra-high-strength locking rivets are as follows:
[0054] (1) The molten steel smelted by the converter is refined outside the LF furnace and then subjected to RH vacuum refining. The vacuum degree of the vacuum tank in the RH process is 70pa, and the pure degassing time of the RH refining is 17 minutes. The molten steel refined by RH is prepared into a bloom through the continuous casting process.
[0055] (2) After the bloom obtained in step (1) is opened, the hot-rolled billet is placed in a slow cooling pit for 52 hours;
[0056] (3) Steel slab heating: heat the hot-rolled ...
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