A kind of hot-rolled steel and its manufacturing method, mooring chain and its manufacturing method
A manufacturing method and hot-rolled steel technology, which are applied to ships and other directions, can solve the problems of high energy consumption and high cost, and achieve the effect of saving production costs and reducing energy consumption.
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Embodiment 1
[0045] The process route for manufacturing hot rolled steel provided by the present invention includes the following steps: FAF (electric furnace steelmaking) → LF refining (ladle refining) → VD refining (vacuum refining) → continuous casting → cutting → cooling (slow cooling) → inspection → judgment → heating → rolling → cutting → air cooling → ultrasonic + magnetic particle inspection → (finishing) → judgment → packaging → weighing → storage. The main steps in the above steps are described below.
[0046] Such as figure 1 As shown, the manufacturing method of hot rolled steel provided in the first embodiment of the present invention includes:
[0047] Step 11: Melt the raw materials into molten steel and tap the steel;
[0048] The raw materials include main materials and auxiliary materials. Among them, the main materials include pig iron and scrap steel. Of course, pig iron can also be replaced by molten iron, or pig iron and molten iron can be added at the same time. Pig iron ...
Embodiment 2
[0108] In order to better solve the above technical problems, the second embodiment of the present invention provides a hot rolled steel, which contains 0.20% to 0.35% by weight of vanadium, 0.020% to 0.030% of titanium, and 0.015% by weight. ~0.020% nitrogen.
[0109] Of course, the hot rolled steel also includes: 0.30% to 0.50% by weight of chromium, 0.20% to 0.50% of nickel, and 0.20% to 0.30% of molybdenum.
[0110] It can be seen that the proportions of precious metal elements such as chromium, molybdenum, nickel, niobium and titanium are less than the content of the existing hot-rolled steel, which greatly reduces the production cost.
[0111] The hot rolled steel also includes: 0.27% to 0.34% carbon by weight, 0.17% to 0.37% silicon, 1.40% to 1.80% manganese, 0.020% to 0.065% aluminum, and 0.00% to 0.20% copper. , 0.000% to 0.025% of phosphorus, 0.000% to 0.015% of sulfur, 0.0000% to 0.0015% of oxygen, 0.00000% to 0.00020% of hydrogen, and the balance is iron.
[0112] The hot...
Embodiment 3
[0117] Correspondingly, the third embodiment of the present invention provides a method for manufacturing a mooring chain, such as image 3 Shown, including:
[0118] Step 31: Flash welding the hot rolled steel;
[0119] Step 32: Air cooling the welded hot rolled steel to obtain a mooring chain;
[0120] Wherein, the hot-rolled steel contains 0.20% to 0.35% of vanadium, 0.020% to 0.030% of titanium, and 0.015% to 0.020% of nitrogen by weight.
[0121] The manufacturing method of the mooring chain provided in the third embodiment of the present invention not only ensures the strength of the mooring chain, but also eliminates the heat treatment process in the chain manufacturing process, which reduces energy consumption and saves production costs.
[0122] Specifically, the step of flash welding the hot rolled steel includes: flash welding the hot rolled steel at a temperature of 800°C to 950°C.
[0123] It can also be said that the manufacturing method of the mooring chain provided in th...
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Abstract
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