Low-cost thick subsea pipeline steel plate and manufacturing method of low-cost thick subsea pipeline steel plate
The technology of a submarine pipeline and its manufacturing method is applied in the field of low-cost thick specification submarine pipeline steel plate and its manufacturing field, which can solve the problems of poor performance and high cost, and achieve the effects of high strength, low production cost, good economy and feasibility
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Embodiment 1
[0049] Desulfurization is pretreated by KR molten iron, after treatment, the sulfur content is 0.002%, the temperature of the molten iron is 1258°C, and the arsenic content is 0.003%.
[0050] Converter: Double slag smelting process is adopted, the oxygen flow rate during the dephosphorization period is 24,000 cubic meters per hour, and the average gun position is 1850mm. The ore adding temperature is 1605°C. When the blowing reaches 5 minutes and 05 seconds, the dephosphorization period ends, and the slag is dumped. The slagging state is better when the slag is dumped, and the amount of slag dumped is large. Bottom blowing strength 52m 3 / h, supplementary blowing once when the carbon content is 0.20%, the carbon content at the end point of the converter is 0.03%, the phosphorus content is 0.0065%, and the end point temperature is 1622°C. Double-block slag tapping, during the tapping process, add Al-Mn-Fe for deoxidation, add lime and fluorite to make slag, and then add meta...
Embodiment 2
[0063] Using KR hot metal pretreatment for desulfurization, after treatment, the sulfur content is 0.003%, the temperature of the hot metal is 1335°C, and the arsenic content is 0.004%.
[0064] Converter: Double slag smelting process is adopted, the oxygen flow rate during the dephosphorization period is 23,000 cubic meters per hour, and the average gun position is 1890mm. The ore adding temperature is 1592°C. When the blowing reaches 5 minutes and 40 seconds, the dephosphorization period ends, and the slag is dumped. The slagging state is better when the slag is dumped, and the amount of slag dumped is large. Bottom blowing strength 55m 3 / h, supplementary blowing once when the carbon content is 0.20%, the carbon content at the end point of the converter is 0.03%, the phosphorus content is 0.0060%, and the end point temperature is 1615°C. Double-block slag tapping, during the tapping process, add Al-Mn-Fe for deoxidation, add lime and fluorite to make slag, and then add me...
Embodiment 3
[0077] Using KR hot metal pretreatment for desulfurization, after treatment, the sulfur content is 0.004%, the temperature of the hot metal is 1270°C, and the arsenic content is 0.003%.
[0078] Converter: Double slag smelting process is adopted, the oxygen flow rate during the dephosphorization period is 24,000 cubic meters per hour, and the average gun position is 1905mm. The ore adding temperature is 1623°C. When the blowing reaches 6 minutes and 08 seconds, the dephosphorization period ends, and the slag is dumped. The slagging state is better when the slag is dumped, and the amount of slag dumped is large. Bottom blowing strength 53m 3 / h, supplementary blowing once when the carbon content is 0.20%, the carbon content at the end point of the converter is 0.03%, the phosphorus content is 0.0060%, and the end point temperature is 1620°C. Double-block slag tapping, during the tapping process, add Al-Mn-Fe for deoxidation, add lime and fluorite to make slag, and then add me...
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