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Manufacturing method of steel and forge piece thereof for valve seat of deep sea oil extraction equipment

A manufacturing method and technology for steel forgings, which are applied in the field of manufacturing steel for valve seats of deep-sea oil production equipment and forgings, can solve the problems of reduced effective bearing capacity, complex structure, large internal stress, etc., and achieve corrosion resistance and comprehensive mechanical properties. The effect of improving and improving comprehensive mechanical properties and low temperature toughness

Active Publication Date: 2016-06-15
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, AISI4130 (MOD) is usually used as the valve seat material for manufacturing deep-sea oil production equipment in the world. This material belongs to low-alloy structural steel with medium hardenability. In addition, the valve seat has a large size and a complex structure, and there are multiple round and square transition interfaces. Often in the water cooling and quenching, the internal stress is too large due to the excessive cooling rate, which leads to the quenching crack of the valve seat
In addition, due to the large size of the valve seat, it is often not easy to forge through, resulting in segregation, looseness and keyholes that cannot be eliminated during the forging process. During the subsequent heat treatment process, stress concentration will be caused in these defective parts, resulting in cracking or cracking of the valve seat. reduce its effective carrying capacity
Therefore, using the conventional forging process to process AISI4130 (MOD) material to manufacture deep-sea valve seats cannot guarantee the success rate and qualification rate of the product, especially the low-temperature toughness of the valve seat does not meet the requirements, and cannot guarantee its use in deep-sea oil production equipment life

Method used

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  • Manufacturing method of steel and forge piece thereof for valve seat of deep sea oil extraction equipment
  • Manufacturing method of steel and forge piece thereof for valve seat of deep sea oil extraction equipment
  • Manufacturing method of steel and forge piece thereof for valve seat of deep sea oil extraction equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) According to the size of the valve seat of deep sea oil production equipment, select the appropriate steel blank. Described iron and steel material comprises each component of following mass percent (wt.%):

[0033]

[0034] According to the size of the required structural parts, choose a 5.4-ton octagonal plum blossom ingot, and coat a layer of glass-like coating on the surface of the billet. The main component of the glass-like coating is (wt.%): 50% SiO 2 +2%Al 2 o 3+3% CaO+15% clay+30% water glass. Then put it into the furnace and heat it to 1300°C for 3 hours to keep it out of the furnace, press the pliers handle on a 35MN free forging and quick forging hydraulic press, and chamfer. Upsetting in the axial direction to a height-to-diameter ratio of 0.84 (the height after upsetting is 800 mm). Chop and cut the pliers, use 600mm wide upper and lower flat anvils to elongate along the radial direction of the steel ingot, the deformation amount is 20-25%, repe...

Embodiment 2

[0040] (1) According to the size of the valve seat of deep sea oil production equipment, select the appropriate steel blank. Described iron and steel material comprises each component of following mass percent (wt.%):

[0041]

[0042] According to the size of the required structural parts, choose a 5.4-ton octagonal plum blossom ingot, and coat a layer of glass-like coating on the surface of the billet. The main component of the glass-like coating is (wt.%): 50% SiO 2 +2%Al 2 o 3 +3% CaO+15% clay+30% water glass. Then put it into the furnace and heat it to 1300°C for 3 hours to keep it out of the furnace, press the pliers handle on a 35MN free forging and quick forging hydraulic press, and chamfer. Upsetting in the axial direction to a height-to-diameter ratio of 0.84 (the height after upsetting is 800 mm). Chop and cut the pliers, use 600mm wide upper and lower flat anvils to elongate along the radial direction of the steel ingot, the deformation amount is 20-25%, rep...

Embodiment 3

[0048] (1) According to the size of the valve seat of deep sea oil production equipment, select the appropriate steel blank. Described iron and steel material comprises each component of following mass percent (wt.%):

[0049]

[0050]

[0051] According to the size of the required structural parts, choose a 5.4-ton octagonal plum blossom ingot, and coat a layer of glass-like coating on the surface of the billet. The main component of the glass-like coating is (wt.%): 50% SiO 2 +2%Al 2 o 3 +3% CaO+15% clay+30% water glass. Then put it into the furnace and heat it to 1300°C for 3 hours to keep it out of the furnace, press the pliers handle on a 35MN free forging and quick forging hydraulic press, and chamfer. Upsetting in the axial direction to a height-to-diameter ratio of 0.84 (the height after upsetting is 800 mm). Chop and cut the pliers, use 600mm wide upper and lower flat anvils to elongate along the radial direction of the steel ingot, the deformation amount is...

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Abstract

The invention discloses a manufacturing method of steel and a forge piece thereof for a valve seat of deep sea oil extraction equipment. The manufacturing method comprises the following steps: taking special steel as a blank, coating the surface of the blank by using a glassy coating, and forging the blank in a mode of composite forging including free forging and die forging to obtain a secondary forging stock of the valve seat; normalizing the forging stock of the valve seat, and carrying out quenching thermal treatment on the forging stock of the valve seat by using a four-stage intermittent quenching process including ice water cooling, air cooling, boiling water cooling and common water cooling; heating a valve seat forge piece subjected to quenching thermal treatment to the temperature of 675-690 DEG C and insulating for 10 hours at least, discharging from a furnace, and cooling in air until the temperature is equal to room temperature so as to obtain a steel forge piece for the valve seat of the deep sea oil extraction equipment. By combination of a forging process and a thermal treatment process, quenching cracking of a large force piece which is complicated in shape is prevented effectively, and comprehensive mechanical property, particularly low-temperature toughness, of the manufactured steel forge piece for the valve seat of the deep sea oil extraction equipment is improved greatly, so that the steel forge piece can be well suitable for a deep sea environment under the working condition of low temperature.

Description

technical field [0001] The invention relates to a steel for a valve seat of deep-sea oil production equipment and a method for manufacturing the steel and a forging thereof, belonging to the field of metal forging and heat treatment. Background technique [0002] my country's South China Sea is rich in oil and gas resources, with geological reserves of 23 billion to 30 billion tons, of which 75% are located in deep sea areas. For the oil and gas resources in the deep sea, it is necessary to use deep sea oil production equipment to successfully exploit the oil and gas resources. There are a large number of various types of valves in deep sea oil production equipment, including: gate valves, throttle valves, plug valves, check valves, throttle valves, emergency shut-off valves, etc. It can be seen that the valve is an important part of the deep sea oil production equipment. The valve seat is precisely the carrier of all parts of the valve and pipelines, and requires good mec...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/18C22C38/08C22C38/16C22C38/12C21D1/25B21K1/24B21J5/00
CPCB21J5/00B21K1/24C21D1/25C22C38/005C22C38/02C22C38/04C22C38/08C22C38/12C22C38/16C22C38/18
Inventor 巨佳王章忠张保森巴志新毛向阳杨柳
Owner NANJING INST OF TECH
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