High-strength ship hull structural steel and production method of plate roll
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A technology for structural steel and production methods, applied in the direction of furnace types, furnaces, rolling mill control devices, etc., can solve the problems of unstable heating temperature of slabs, uneven temperature distribution, and large occupation of working capital, so as to reduce working capital, Excellent flatness and high production efficiency
Active Publication Date: 2009-09-16
MAANSHAN IRON & STEEL CO LTD
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Its disadvantages are complex process, many equipments, long production line and high infrastructure investment; long production cycle, which takes more than 2 days from smelting molten steel to rolling into ship plate, which takes up a lot of working capital; secondary heating of slab, high energy consumption; The heating temperature of the slab is unstable, and the cross-section temperature distribution along the length and width direction is uneven, which affects the performance of the ship plate, and affects the accuracy of the thickness, convexity, flatness and width of the plate: the yield is low, generally 88%; due to the Due to the limitations of rolling mills and other aspects, it is even more difficult to produce thin-gauge ship plates
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Embodiment 1
[0048]Example 1: Rolling 3.5mm ship plate, qualified molten steel, casting slabs at a casting speed of 4.0m / min through CSP continuous casting machine 1 (mold mold slag 188GA3, cooling curve 2#, vibration curve 6#), and then hydraulically Cut 2 into a fixed length (35m×70mm×1500mm), enter the soaking furnace 3 for heating, the soaking temperature is controlled at 1180±10°C, exit the soaking furnace, go through the high-pressure water descaling machine 4, and enter the vertical roller mill 5 After side pressing, it enters the seven-stand continuous rolling mill for 6 continuous rolling, the starting rolling temperature is 1050±10°C, and the final rolling temperature is 890±10°C. After exiting the last rolling mill, it passes through the laminar flow device 7 for controlled cooling at the rear stage, cuts the head through the flying shear 9, and is coiled into a hot-rolled coil by the coiler 8. The coiling temperature is 640°C, and then it is rolled off the production line. In T...
Embodiment 2
[0049] Embodiment 2: with the method for embodiment 1, roll the ship plate of 4.0mm, its steel plate composition is listed in table 1, and its performance test data is listed in table 2, and relevant process parameter is listed in table 3.
Embodiment 3
[0050] Embodiment 3: with the method for embodiment 1, roll the ship plate of 5.5mm, its steel plate composition is listed in table 1, and its performance test data is listed in table 2, and relevant process parameter is listed in table 3.
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Abstract
The steel for high-strength hull structure and its coil production method belong to low-alloy steel, and especially relates to the steel for hull structure and its production method. The composition (wt%) of steel includes 0.03-0.075%C, 0.01-0.35%Si, 1.40-1.60%Mn, 0.015-0.100%Als, 0.020-0.080%V, and the rest is Fe and impurity elements; its production method is characterized by In the CSP production line, a special temperature system, reduction system and cooling system are adopted. The molten steel is cast by the continuous casting machine, hydraulically sheared into a fixed-length billet, and heated in a soaking furnace. After descaling, the hot billet enters the vertical roller for lateral rolling. The side and seven-stand four-high rolling mills are continuously rolled into strips, and then enter the laminar flow cooling device to control cooling, and finally rolled into coils. The advantages are fewer alloy varieties, simplified process, short production line, less equipment, high production efficiency, high yield, low energy consumption; uniform and stable product performance, high strength; good plate shape, plate thickness, horizontal and vertical dimensions, convexity , High flatness precision, good surface quality, can improve the yield of shipbuilding processing.
Description
technical field [0001] The invention belongs to low-alloy steel, in particular to steel for ship hull structure and its production method. Background technique [0002] With the development of the shipbuilding industry, ordinary marine steel plates can no longer meet the requirements of large-scale and professional ships, and people prefer low-alloy steel with excellent performance. Chinese national standard GB712-2000 discloses high-strength ship steel composition (wt%) C≤0.18%, Si≤0.50%, 0.90-1.60% Mn, Als≥0.015, 0.02-0.05% Nb, 0.05-0.10% V, Ti≤0.02%, Cu≤0.35%, Cr≤0.02%, Ni≤0.40%, Mo≤0.08%, and the rest are Fe and impurity elements. There are as many as 11 alloying elements in this kind of steel. The disadvantage is that there are many kinds of alloys to be added, and some alloying elements are expensive, which increases the cost of steelmaking and brings inconvenience to steelmaking production. Nowadays, steel plates for hull structures are mostly produced by convention...
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