Technology for producing LS-CrNiMo30C steel forging for subsea oil production wellhead device through continuous casting billet
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A technology of wellhead device and continuous casting slab, which is applied in the field of steel forging production, can solve the problems of forgings that cannot meet the use requirements, poor compactness of casting slab, heavy segregation, etc., achieve high degree of automation and mechanization, improve internal quality, improve The effect of yield
Active Publication Date: 2017-04-26
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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Problems solved by technology
Compared with die-cast ingots, continuous casting slabs have different casting methods and steel solidification principles, and the internal quality of casting slabs has the characteristics of poor compactness and heavy segregation. Therefore, the forgings produced generally cannot meet the steel requirements for deep-sea oil production wellhead devices.
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Embodiment 1
[0020] The material is LS-CrNiMo30C steel;
[0021] 1) Smelting: Molten iron needs to be pretreated by KR to remove S and Si. S=0.005% before entering the converter. BOF converter smelting mainly removes P, C and heats up, and alloys are added after tapping. During the LF refining process, fine-tune the composition of molten steel, deoxidize, remove S, and remove inclusions. After RH vacuum degassing treatment, H = 0.8ppm.
[0022] 2) Continuous casting: The molten steel is protected by argon throughout the pouring process, and the superheat is controlled at 25°C. The Φ600mm continuous casting round billet is produced by using the combined electromagnetic stirring technology of the crystallizer (M-EMS) and the terminal (F-EMS), and it is rolled off the production line. The pit entry temperature is 550°C, and the holding time is 36 hours. After slowly cooling out of the pit, the continuous casting slab is taken to detect the low-magnification structure. According to the rating...
Embodiment 2
[0027] The material is LS-CrNiMo30C steel.
[0028] 1) Smelting: Molten iron needs to be pretreated by KR to remove S and Si, and S=0.003% before entering the converter. BOF converter smelting mainly removes P, C and heats up, and alloys are added after tapping. During the LF refining process, fine-tune the composition of molten steel, deoxidize, remove S, and remove inclusions. After RH vacuum degassing treatment, H = 1.0ppm.
[0029] 2) Continuous casting: The molten steel is protected by argon throughout the pouring process, with a superheat of 27°C, and the composite electromagnetic stirring technology of the crystallizer (M-EMS) and the end (F-EMS) is used to produce Φ600mm continuous casting round billets, which are rolled off the assembly line and put into the pit The temperature is 580°C, the holding time is 40h, after slow cooling out of the pit, the continuous casting slab is taken to detect the low-magnification structure, according to the rating inspection in Appe...
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Abstract
The invention relates to a technology for producing an LS-CrNiMo30C steel forging for a subsea oil production wellhead device through a continuous casting billet. The technology is characterized in that phi 300-400mm forged round steel is produced through a phi 600mm continuous casting round billet. The technology comprises the steps of smelting molten steel, continuously casting, forging, annealing, cooling, etc.; according to the grading in Appendix A of YB / T4149 Standard, a continuous casting billet macrostructure meets the following requirements: the center porosity is not greater than grade 2.0, the center cracks are not greater than grade 1.0, and the shrinkage cavity is not greater than grade 1.0; intermediate cracks, white points and skull patch defects are prohibited; the temperature increasing speed in casting billet heating during forging is not greater than 200 DEG C per hour; the forging heating temperature is 1200 to 1250 DEG C; the casting billet is completely burnt; the primary forging temperature is more than 1150 DEG C, and the final forging temperature is not less than 850 DEG C; after being removed from the production line, the forging is slowly cooled in a sand burying manner under the high temperature not less than 500 DEG C; after the temperature decreases to be less than 200 DEG C, the forging is removed from a sand pit for slowly cooling; the internal quality of the finished steel forging meets the requirement of D / d grade of Ultrasonic Testing SEP 1921 Standard, and the mechanical property meets the requirements of API SPEC 6A Standard.
Description
technical field [0001] The invention belongs to the technical field of steel forging production, and relates to a method for continuously casting slabs to produce LS-CrNiMo30C steel forgings for deep-sea oil production wellhead devices. Background technique [0002] The deep sea oil production wellhead device consists of three parts: casing head, tubing head and Christmas tree. It is an important equipment for oil and gas production. It is mainly used to control the pressure of the production wellhead and adjust the flow of oil (gas) and water wells. The relationship between its performance Whether oil and gas wells can produce safely and efficiently. [0003] At present, the steel used for deep-sea oil production wellhead devices is mostly forged by die-casting steel ingots. Because the internal quality of steel ingots is better than that of continuous casting billets (especially alloy steels containing a certain amount of Cr, Ni, Mo, etc.), the forged bars It can meet the...
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