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Casting process for petroleum-machinery blowout preventer steel casting

A technology of petroleum machinery and casting process, applied in the field of metal casting process, can solve the problems of easy deformation of BOP steel castings, outstanding quality problems of BOP casting steel parts, poor impact resistance, etc., so as to avoid deformation. , the removal effect is good, the effect of enhancing the impact resistance

Inactive Publication Date: 2017-05-31
MOBAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is of great importance to ensure the quality of BOP castings. Domestic and foreign petroleum equipment markets have higher and higher requirements for drilling safety, while BOP castings require high pressure resistance, corrosion resistance, impact resistance, good safety, and high reliability. , there are very few foundries producing BOP shells in China, and there have been surface and internal quality problems for many years, which cannot meet the requirements of BOP steel castings. BOP steel casting shells are the main key parts
The existing BOP steel castings have poor impact resistance, which makes the BOP steel castings easy to deform, and the inside of the BOP steel castings contains a large amount of harmful phosphorus and sulfur elements, which makes the BOP steel casting shell outstanding quality problems

Method used

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  • Casting process for petroleum-machinery blowout preventer steel casting
  • Casting process for petroleum-machinery blowout preventer steel casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In this embodiment, a casting process for a steel casting of a blowout preventer for petroleum machinery is proposed, including the following steps:

[0022] S1: Antimony, cobalt, tin, chromium, steel, silica sand and additives are used as molding materials. The composition of the molding materials in terms of mass percentage is as follows: antimony is 0.4%, cobalt is 2%, tin is 1.8%, and chromium is 0.6% %, 50% for steel, 15% for silica sand, and 0.8% for additives. Put the components of the modeling material into a high-temperature electric melting furnace. Put it in the high-temperature electric melting furnace for 4 hours, and then you can get the mixed liquid of the molding material;

[0023] S2: Add Ca-CaF2 solvent to the high-temperature furnace, and at the same time feed the mixed gas of argon and helium into the high-temperature furnace. The flow rate ratio of the mixed gas of argon and helium is 2:1. At this time, the temperature of the high-temperature furnac...

Embodiment 2

[0029] In this embodiment, a casting process for a steel casting of a blowout preventer for petroleum machinery is proposed, including the following steps:

[0030] S1: Antimony, cobalt, tin, chromium, steel, silica sand and additives are used as molding materials. The composition of the molding materials in terms of mass percentages is as follows: antimony is 0.7%, cobalt is 3%, tin is 2.3%, and chromium is 0.8% %, 55% for steel, 20% for silica sand, and 1.2% for additives. Put the components of the modeling material into a high-temperature electric melting furnace. The internal temperature of the high-temperature electric melting furnace is set to 1650°C and the pressure is set to 650MPa. Put it in the high-temperature electric furnace for 5 hours, and then you can get the mixed liquid of the molding material;

[0031] S2: Add Ca-CaF2 solvent to the high-temperature furnace, and at the same time, feed the mixed gas of argon and helium into the high-temperature furnace. The f...

Embodiment 3

[0037] In this embodiment, a casting process for a steel casting of a blowout preventer for petroleum machinery is proposed, including the following steps:

[0038] S1: Using antimony, cobalt, tin, chromium, steel, silica sand and additives as molding materials, the composition of the molding materials in terms of mass percentages is as follows: 1% antimony, 4% cobalt, 2.8% tin, and 1.2% chromium %, 60% for steel, 25% for silica sand, and 1.6% for additives. Put the components of the modeling material into a high-temperature electric melting furnace. The internal temperature of the high-temperature electric melting furnace is set to 1800°C and the pressure is set to 800MPa. Put it in the high-temperature electric melting furnace for 6 hours, and then you can get the mixed liquid of the molding material;

[0039]S2: Add Ca-CaF2 solvent to the high-temperature furnace, and at the same time, feed the mixed gas of argon and helium into the high-temperature furnace. The flow rate r...

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Abstract

The invention discloses a casting process for a petroleum-machinery blowout preventer steel casting. The casting process comprises the steps: S1: adopting 0.4-1 wt% of antimony, 2-4 wt% of cobalt, 1.8-2.8 wt% of tin, 0.6-1.2 wt% of chromium, 50-60 wt% of steel, 15-25 wt% of silica sand and 0.8-1.6 wt% of an additive as a molding material, and putting the components of the molding material into a high-temperature electric melting furnace, wherein the internal temperature of the high-temperature electric melting furnace is set to 1500-1800 DEG C, the pressure is set to 500-800 MPa, and the standing time of the molding material in the high-temperature electric melting furnace is 4-6h; thus, obtaining mixing liquid of the molding material; S2: adding a Ca-CaF2 solvent into the high-temperature electric melting furnace. The casting process can effectively remove phosphorus and sulfur in the petroleum-machinery blowout preventer steel casting from the material, so that the quality of the petroleum-machinery blowout preventer steel casting is greatly improved, and the petroleum-machinery blowout preventer steel casting has strong impact resistance and is not easy to cause deformation.

Description

technical field [0001] The invention relates to the technical field of metal casting technology, in particular to a casting technology of steel castings for blowout preventers of petroleum machinery. Background technique [0002] Petroleum mechanical blowout preventers are mainly used in oil fields and oil drilling enterprises. It is an essential safety device in oil and natural gas drilling engineering. It has the functions of preventing blowout during drilling and handling other complicated situations. It can close the empty wellbore when there is no drill string in the well, and close the casing when there is a drill string in the well. The annular space between the pipe and the drill string. Therefore, it is of great importance to ensure the quality of BOP castings. Domestic and foreign petroleum equipment markets have higher and higher requirements for drilling safety, while BOP castings require high pressure resistance, corrosion resistance, impact resistance, good sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/00C21C7/064C21D1/18C21D1/26
CPCC22C33/006C21C7/064C21D1/18C21D1/26
Inventor 马从勇
Owner MOBAO CO LTD