Process for manufacturing steel forge piece of vertical conveying pipe of deep sea oil extraction equipment
A manufacturing process and technology for steel forgings, which is applied in the field of steel forgings manufacturing process for deep-sea oil production equipment delivery risers, can solve the problems that the low-temperature toughness is difficult to meet the requirements and cannot be used in low-temperature working conditions, and achieves saving forging equipment occupancy rate, one-time delivery The effect of improving the inspection pass rate and reducing the number of upsets
Active Publication Date: 2011-09-14
迪威尔(南京)精工科技有限公司
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Problems solved by technology
Therefore, if the chromium-molybdenum low-alloy steel F22 MOD material with moderate cost performance is selected, the deep-sea riser manufactured by the conventional forging manufacturing process cannot meet the requirements for low-temperature toughness, and cannot be suitable for low-temperature working conditions such as deep sea
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[0059] Embodiment (process number C), the specific steps are as follows:
[0060] Step C①: Using chromium-molybdenum low-alloy steel as a blank, the chromium-molybdenum low-alloy steel blank is smelted by the process of primary smelting in an electric furnace, refining outside the furnace, and vacuum degassing. The chromium-molybdenum low-alloy steel is composed of carbon, silicon, manganese , chromium, molybdenum, phosphorus, sulfur, hydrogen, nickel, niobium, vanadium, titanium, copper and aluminum, its mass percentage is:
[0061] 0.12%≤carbon≤0.15%, 0.15%≤silicon≤0.40%, 0.50%≤manganese≤0.60%, 2.25%≤chromium≤2.50%, 1.00%≤molybdenum≤1.10%, phosphorus≤0.020%, sulfur≤0.015%, Hydrogen≤2.0ppm, 0.20%≤nickel≤0.50%, 0
[0062] 0
[0063] Step C②: Select the square ingot according to the size of the required structural parts, put it into ...
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The invention discloses a process for manufacturing a steel forge piece of a vertical conveying pipe of deep sea oil extraction equipment. The process comprises the following steps of: 1, taking chrome molybdenum low alloy steel as a blank; 2, putting a square ingot into a furnace, heating to 1,200 DEG C, and cogging to pull the blank along the length direction of a steel ingot; 3, putting the blank into the furnace, heating, and discharging the blank to obtain a blank which is compacted and forged completely; 4, forging the blank which is compacted and forged completely to form an eight-directional edge shaft to obtain a stepped shaft forged blank; 5, performing rough machining on the stepped shaft forged blank to obtain a hollow stepped workpiece; 6, heating the hollow stepped workpiece to 900 DEG C, preserving the heat for 3 hours, discharging, and cooling to room temperature in the air; 7, heating the hollow stepped workpiece to 920 DEG C, preserving the heat for 3 hours, and performing water quenching, wherein the quenched water temperature is not more than 49 DEG C after the water quenching is finished; and 8, heating the hollow stepped workpiece to 625 DEG C, preserving the heat for 6 hours, and cooling to room temperature in the air. The forge piece manufactured by the process can be well suitable for a deep sea low-temperature working condition environment.
Description
technical field [0001] The invention belongs to a manufacturing process of steel forgings used for conveying risers of deep-sea oil production equipment, and the manufacturing process is a combination of forging process and heat treatment process. Background technique [0002] The delivery riser of deep-sea oil production equipment is the most important interface for the development of the entire deep-water oil and gas field. It is one of the important components of the offshore oil and gas production system connecting the floating body on the sea surface and the underwater wellhead production system. Generally speaking, the functions to be completed by the deepwater riser are: 1) output, input or circulating fluid; 2) guidance of drilling or workover rig tools to the wellhead; 3) supporting auxiliary lines. The delivery riser of deep-sea oil production equipment is subjected to environmental loads such as wind, waves, and currents in the marine environment. When waves and c...
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IPC IPC(8): C22C38/50C21D1/18B21J5/08
Inventor 张利徐元生王洁
Owner 迪威尔(南京)精工科技有限公司
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