A steel plate for ocean engineering that can be welded with large heat input and its manufacturing method

A technology for high-line energy welding and marine engineering, applied in the field of structural steel for ships and marine engineering, can solve the problems of narrow composition control window, clogging of continuous casting nozzles, difficult production control, etc., to prolong reheating time and reduce reheating. Temperature, the effect of easy on-site operation

Inactive Publication Date: 2018-07-24
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But these technologies exist Deoxidized alloys are easy to oxidize, difficult to store and add, easy to cause violent tumbling of molten steel when added, and the alloy yield is low or unstable
If not properly controlled, the generated inclusions are easy to gather and grow up, and in severe cases, it will block the continuous casting nozzle
There are strict requirements on the content ratio of alloying elements, resulting in a narrow composition control window and difficult production control
The role of rolling and water cooling processes in the production of this type of steel has not been fully utilized

Method used

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  • A steel plate for ocean engineering that can be welded with large heat input and its manufacturing method
  • A steel plate for ocean engineering that can be welded with large heat input and its manufacturing method
  • A steel plate for ocean engineering that can be welded with large heat input and its manufacturing method

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Experimental program
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Effect test

Embodiment 1

[0022] The production process of a steel plate for marine engineering that can be welded with large heat input is: blast furnace hot metal→hot metal pretreatment→converter smelting→LF refining→RH refining→slab continuous casting→slab reheating→rolling→water cooling→sampling inspection ; P ≤ 0.08%, Cr ≤ 0.06%, As ≤ 0.006% of the blast furnace molten iron, the pretreatment of molten iron is desulfurization and slag removal of molten iron, after the molten iron pretreatment, the exposed area of ​​molten iron is 77%, the S content is 0.002%, and the converter When tapping after smelting, add ferrosilicon to the ladle for deoxidation when 1 / 4 of the tapping is reached, then add manganese metal for alloying, add 850Kg of lime and 240Kg of fluorite during tapping, and then proceed to the CAS station after tapping Argon blowing, argon blowing time 11 min, argon blowing time includes steel tapping argon blowing, LF refining with ferrosilicon to adjust the oxygen content of molten steel ...

Embodiment 2

[0024] The production process of a steel plate for marine engineering that can be welded with large heat input is: blast furnace hot metal→hot metal pretreatment→converter smelting→LF refining→RH refining→slab continuous casting→slab reheating→rolling→water cooling→sampling inspection ; P ≤ 0.08%, Cr ≤ 0.06%, As ≤ 0.006% of the blast furnace molten iron, the pretreatment of the molten iron is desulfurization and slag removal of the molten iron, the exposed area of ​​the molten iron is greater than 76% after the pretreatment of the molten iron, S = 0.002%, the converter When tapping after smelting, add ferrosilicon to the ladle for deoxidation when 1 / 4 of the tapping is reached, then add manganese metal for alloying, add 900Kg of lime and 380Kg of fluorite during tapping, and carry out CAS station after tapping Argon blowing, argon blowing time 15 min, argon blowing time includes tapping argon blowing, during LF refining, use ferrosilicon to adjust the oxygen content of molten s...

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Abstract

The invention belongs to the technical field of structural steel for ships and ocean engineering, and in particular, relates to a high-energy-input welded steel plate for ocean engineering and a manufacturing method thereof. The steel plate comprises the following chemical components in percentage by mass: 0.04-0.10% of C, 0.05-0.10% of Si, 1.40-1.70% of Mn, P not more than 0.010%, S not more than 0.005%, Als not more than 0.010%, 0.020-0.030% of Nb, 0.020-0.040% of V, 0.008-0.016% of Ti, 0.30-0.50% of Ni, 0.001-0.003% of Ca, and the balance of Fe and inevitable impurities. The steel plate has the following advantages: the deoxidation process in the smelting procedure is simple; the ferrosilicon and metal manganese deoxidation is mainly used; the intermingling number of large aluminum oxide in steel is reduced; and such strong oxide forming elements as Zr / Mg / REM are not added.

Description

technical field [0001] The invention belongs to the technical field of structural steel for ships and marine engineering, and in particular relates to a steel plate for marine engineering that can be welded with large heat input and a manufacturing method thereof. Background technique [0002] With the development of offshore oil and gas resources expanding to extremely cold sea areas, in order to make oil and gas exploration platforms able to withstand severe loads such as storms, tides, and even earthquakes in low-temperature environments, the requirements for low-temperature toughness of steel plates used on offshore platforms continue to increase. Therefore, the demand for steel plates for marine engineering with excellent low-temperature impact energy at -60°C continues to increase. [0003] The use of steel plates that can be welded with large input energy (≥100kJ / cm) can significantly improve welding efficiency, shorten the construction period, and reduce costs. There...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/14C22C38/08C21D8/02C21C7/06B22D11/12
CPCB22D11/12C21C7/06C21D8/0226C21D2211/005C21D2211/009C22C38/002C22C38/02C22C38/04C22C38/08C22C38/12C22C38/14
Inventor 李敏徐洪庆王焕洋朱延山刘晓东李旺生王南辉
Owner SHANDONG IRON & STEEL CO LTD
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