Manufacturing method of corrosion-proof steel plate used for crude oil tanker cargo oil hold inner bottom plate and steel plate
A crude oil tanker, corrosion-resistant steel plate technology, applied in the direction of process efficiency improvement, etc., can solve the problems of inner bottom plate pitting, cumbersome operating procedures, reduce the overall corrosion rate of the cabin, etc., to prevent intrusion, inhibit pitting corrosion, excellent anti-corrosion Effect of local corrosion ability
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Embodiment 1
[0041] Example 1: The chemical composition of the test steel plate in terms of mass percentage is: C: 0.12%, Si: 0.23%, Mn: 1.1%, P: 0.010%, S: 0.002%, Cu: 0.1%, Ni: 0.1%, W: 0.05%, Zr: 0.01%, Ti: 0.015%, Als: 0.047%, Sn: 0.03%, Ce: 0.0014%, Mg: 0.002%, and the balance is Fe and unavoidable impurities. In the steel plate (Cu+Ni+W) / C=2.1, Mn / (S+Ca+Mg+Sr)=275. The main manufacturing process steps and parameters are as follows: the thickness of the test steel plate is 18mm, the slab is in the furnace for 256min, the residual oxygen volume content is 8%, the descaling pressure is 22MPa, the final rolling temperature is 835℃, and the average reduction rate of the first 7 passes is 9.8% , the starting cooling temperature is 800°C, the final cooling temperature is 600°C, and the ACC cooling rate is 13°C / s. After the ACC water cooling, the steel plate is air-cooled, and the cooling rate is about 0.9°C / s.
Embodiment 2
[0042] Example 2: The chemical composition of the test steel plate in terms of mass percentage is: C: 0.05%, Si: 0.28%, Mn: 1.05%, P: 0.005%, S: 0.0019%, Cu: 0.3%, Ni: 0.3%, W: 0.08%, Zr: 0.009%, Ti: 0.02%, Als: 0.026%, Mo: 0.2%, Sr: 0.001%, Ca: 0.002%, Nb: 0.04%, the balance is Fe and unavoidable impurities, In the steel plate (Cu+Ni+W) / C=13.6, Mn / (S+Ca+Mg+Sr)=214. The main manufacturing process steps and parameters are as follows: test steel plate thickness specification 25mm, slab furnace time 290min, residual oxygen volume content 8%, primary descaling pressure 21MPa, final rolling temperature 790°C, average reduction rate of the first 7 passes 12.3% , the starting cooling temperature is 770°C, the final cooling temperature is 600°C, and the ACC cooling rate is 14°C / s. After the ACC water cooling is completed, the steel plate is air-cooled, and the cooling rate is about 0.98°C / s.
[0043] The mechanical properties and average size of sulfides of the test steel plate produ...
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