Ultra-high-strength, ultra-high and low-temperature impact fracturing pump valve box steel forgings and manufacturing method thereof

A low-temperature impact and ultra-high-strength technology, which is applied in the field of ultra-high-strength, ultra-high and low-temperature impact fracturing pump valve box steel forgings and its manufacturing field, can solve the problems that cannot meet the normal use in alpine regions, the mechanical properties of materials are not strong, and the service life Short and other problems, to improve the ability to resist intergranular corrosion, improve anti-oxidation and acid resistance, and improve the effect of as-cast structure

Active Publication Date: 2017-05-10
陕西华威科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the commonly used fracturing pump valve box material is made of domestic 40CrNimoA, Russian 38CrNi2moV and American 4330 grade materials, which are processed by forging.
Moreover, the materials produced by the existing forging process method have weak mechanical properties and poor corrosion resistance.
In addition, when used under normal temperature conditions, the corrosion resistance is poor, the service life is short, and the cost is high, which cannot meet the needs of oil stimulation and shale gas fracturing.

Method used

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  • Ultra-high-strength, ultra-high and low-temperature impact fracturing pump valve box steel forgings and manufacturing method thereof
  • Ultra-high-strength, ultra-high and low-temperature impact fracturing pump valve box steel forgings and manufacturing method thereof
  • Ultra-high-strength, ultra-high and low-temperature impact fracturing pump valve box steel forgings and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

no. 5 example

[0047] 1. Steelmaking:

[0048] Select conventional raw materials, and through the steps of electric arc furnace smelting-extra-furnace refining-vacuum degassing-casting electrode billet-electroslag remelting-diffusion annealing, the raw materials are made into steel ingots with the chemical composition shown in Table 1. The steel ingots with this chemical composition meet the requirements of "C≤0.30, Si: 0.15--0.35, Mn: 0.6--0.9, S≤0.010, P≤0.010, Cr: 1.80-2.20, Ni>4.00, Mo>0.45, V: 0.12-0.18, Cu≤0.20, Nb, Re: appropriate amount, H≤1.6ppm, 0≤35ppm, N≤65ppm" requirements.

[0049] 2. Inspection:

[0050] Full composition analysis, metallographic inspection and ultrasonic non-destructive testing are carried out on electroslag remelted steel ingots, and steel ingots with qualified quality indicators such as material composition, inclusions and non-destructive testing are screened out.

[0051] The specific process is to first conduct a full analysis of the chemical composition...

no. 6 example

[0083] The implementation of this embodiment is the same as that of the fifth embodiment, wherein in the third step heating and heat preservation process, heat and heat preservation is carried out according to the three-stage heating method. Keep the steel ingot at a temperature of 510°C for 7 hours, then raise the temperature at a rate of 60°C / h to 660°C and hold it for 5 hours, then increase the rate of temperature at 60°C / h to 860°C and hold it for 5 hours, then heat it at 80°C The heating rate is raised to 1190°C for 3 hours at a rate of 1 / h, and finally kept at 1190°C for 8 hours.

[0084]In the fifth step, in the post-forging heat treatment process, the first step is to blast and cool the forgings with a final forging temperature > 850°C to 450°C outside the furnace; the second step is to put the forgings into the heating furnace at 460°C. ℃ for 6 hours; the third step is to raise the furnace temperature to 870 ℃ at a heating rate of 80 ℃ / h for 3 hours, and keep the temp...

no. 7 example

[0086] The implementation of this embodiment is the same as that of the fifth embodiment, wherein in the third step heating and heat preservation process, heat and heat preservation is carried out according to the three-stage heating method. Keep the steel ingot at 500°C for 7 hours, then raise the temperature to 650°C at a rate of 60°C / h and hold it for 5 hours, then raise it to 850°C at a rate of 60°C / h and hold it for 5 hours, and then increase the temperature at 80°C / h The heating rate of h increased to 1180°C for 3h, and finally kept at 1180°C for 8h.

[0087] In the fifth step, in the post-forging heat treatment process, the first step is to blast and cool the forgings with a final forging temperature > 850°C to 450°C outside the furnace; the second step is to put the forgings into the heating furnace at 450°C ℃ for 6 hours; the third step is to raise the furnace temperature to 860 ℃ at a heating rate of 80 ℃ / h for 3 hours, and keep the temperature for 7 hours; the fourt...

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Abstract

The invention relates to a steel forging with an ultra-high strength and an ultra-high low-temperature impact on the box body of a fracturing pump valve and a manufacturing method of the steel forging. The steel forging is used for solving the technical problems of low mechanical performance, bad corrosion resistance, short service life, and high cost of the existing steel materials. The steel forging comprises the following chemical ingredients in percentage by weight: 0.25-0.3% of C, 0.15-0.35% of Si, 0.6-0.9% of Mn, 1.8-2.2% of Cr, 4.05-4.25% of Ni, 0.46-0.6% of Mo, 0.12-0.18% of V, not greater than 0.01% of P, not greater than 0.01% of S, not greater than 0.12% of Nb, not greater than 0.12% of Re, not greater than 0.2% of Cu, not greater than 0.00016% of H, not greater than 0.0035% of O, not greater than 0.0065% of N, and the balance of Fe and inevitable impurities. The steel forging disclosed by the invention can be used in the fields of petroleum exploitation and shale gas exploitation.

Description

technical field [0001] The invention relates to materials for equipment in the fields of petroleum and shale gas exploitation and a manufacturing method thereof, in particular to an ultra-high-strength, ultra-high and low-temperature impact fracturing pump valve casing steel forging and a manufacturing method thereof. Background technique [0002] At present, in the field of oil and shale gas exploitation, fracturing technology can effectively increase the extraction of oil and shale gas, and the fracturing pump is the key equipment in the process of fracturing. According to the twelfth five-year plan for national economic and social development, the relevant requirements for transforming and upgrading the manufacturing industry, optimizing the structure, improving the quality of varieties, improving basic technology, improving the level of research and development of basic materials, and realizing the automation of key parts technology, etc., especially It is because the co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/48C21D8/00C21D1/18
Inventor 王璋
Owner 陕西华威科技股份有限公司
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