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Petroleum drilling high-strength alloy structural steel and preparation method thereof

A high-strength alloy and alloy structural steel technology, applied in the field of iron and steel metallurgy, can solve the problems of low wear resistance, insufficient strength and toughness, and poor hardenability, and achieve comprehensive mechanical properties enhancement, optimization of composition and content, and reduction of hardness. Effect

Inactive Publication Date: 2020-04-21
YINGKOU SPECIAL STEEL FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies in the above-mentioned existing materials, the present invention provides a high-strength alloy structural steel for oil drilling and its preparation method, which adopts a reasonable alloying ratio and manufacturing process to effectively solve the problem of the wear resistance of the existing materials. Low, poor hardenability, insufficient strength and toughness, etc.

Method used

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  • Petroleum drilling high-strength alloy structural steel and preparation method thereof
  • Petroleum drilling high-strength alloy structural steel and preparation method thereof
  • Petroleum drilling high-strength alloy structural steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] In the present embodiment, the composition and mass percentages of the novel petroleum drilling high-strength alloy structural steel material are as follows: C is 0.28%; Si is 0.50%; Mn is 0.80%; Cr is 2.40%; Ni is 1.0%; Mo is 1.0% ; V is 0.03%; Nb is 0.050%; Al is 0.040%; P is 0.015%; S is 0.005;

[0061] The technological process of the new oil drilling high-strength alloy structural steel material produced with the above-mentioned composition ratio is as follows:

[0062] (1) Electric furnace smelting: Carry out electric furnace smelting, refining (LF) and vacuum treatment (VD) according to the composition and mass percentage ingredients in the above examples, and cast into electrode blanks of Φ330~Φ380 and anneal in parallel.

[0063] (2) Electroslag remelting: The electrode blank is electroslag remelted, slagging time: 20min current 3500A, refining 30min current 7000A. Remelting voltage: 73V Current: 8000A~13000A. Feeding voltage: 61V current time 40min mold cool...

Embodiment 2

[0114] In the present embodiment, the composition and mass percentages of the new oil drilling high-strength alloy structural steel material are as follows: C is 0.30%; Si is 0.40%; Mn is 0.60%; Cr is 2.10%; Ni is 1.4%; Mo is 0.9% ; V is 0.05%; Nb is 0.040%; Al is 0.030%; P is 0.012%; S is 0.003;

[0115] The technological process of the new oil drilling high-strength alloy structural steel material produced with the above-mentioned composition ratio is as follows:

[0116] (1) Electric furnace smelting: Carry out electric furnace smelting, refining (LF) and vacuum treatment (VD) according to the composition and mass percentage ingredients in the above examples, and cast into electrode blanks of Φ330~Φ380 and anneal in parallel.

[0117] (2) Electroslag remelting: The electrode blank is electroslag remelted, slagging time: 20min current 3500A, refining 30min current 7000A. Remelting voltage: 73V Current: 8000A~13000A. Feeding voltage: 61V current time 40min mold cooling time...

Embodiment 3

[0138] In the present embodiment, the composition and mass percentages of the novel petroleum drilling high-strength alloy structural steel material are as follows: C is 0.32%; Si is 0.30%; Mn is 0.40%; Cr is 1.90%; Ni is 1.7%; Mo is 0.70% ; V is 0.10%; Nb is 0.030%; Al is 0.020%; P is 0.010%; S is 0.002;

[0139] The technological process of the new oil drilling high-strength alloy structural steel material produced with the above-mentioned composition ratio is as follows:

[0140] (1) Electric furnace smelting: Carry out electric furnace smelting, refining (LF) and vacuum treatment (VD) according to the composition and mass percentage ingredients in the above examples, and cast into electrode blanks of Φ330~Φ380 and anneal in parallel.

[0141] (2) Electroslag remelting: The electrode blank is electroslag remelted, slagging time: 20min current 3500A, refining 30min current 7000A. Remelting voltage: 73V Current: 8000A~13000A. Feeding voltage: 61V current time 40min mold coo...

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Abstract

The invention relates to petroleum drilling high-strength alloy structural steel, which comprises the following components in percentage by weight: 0.28-0.36% of C, less than or equal to 0.50% of Si,less than or equal to 0.80% of Mn, 1.40-2.40% of Cr, 1.0-2.4% of Ni, 0.50-1.00% of Mo, less than or equal to 0.20% of V, less than or equal to 0.050% of Nb, less than or equal to 0.040% of Al, less than or equal to 0.020% of P, less than or equal to 0.010% of S, and the balance of Fe and inevitable impurities. Drill rods and transmission shafts manufactured by adopting the petroleum drilling high-strength alloy structural steel have the advantages of excellent alloy element proportion, pure steel, uniform structure, high strength, good toughness, high fatigue strength and excellent comprehensive performance. The petroleum drilling high-strength alloy structural steel solves the problems of low strength, poor fatigue strength, short service life and high possibility of accidental breakage when encountering a complex geological structure of the conventional commonly-used drill rod and transmission shaft materials in China, the service life of the drill rods and the transmission shafts isgreatly prolonged, accidental breakage is avoided, the production efficiency is improved, and the production cost is saved.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a high-strength alloy structural steel for oil drilling and a preparation method thereof, which is used for making drill pipes and drive shafts in oil drilling equipment, and other steels that require high strength, high toughness, and high fatigue strength. equipment. Background technique [0002] Oil drill pipes and drive shafts are important components of oil drilling equipment. Due to the heavy load of oil drilling equipment, low downhole ambient temperature, and complex underground geological structure, drill pipes and drive shafts need to have high strength, high toughness and high strength at the same time. properties such as fatigue strength. [0003] 40CrNiMo is generally used to make drill pipes and drive shafts in my country, but the drive shafts made of this material have poor fatigue strength and low service life, and are prone to accidental fracture when en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48C22C38/06C21D1/25C21D1/28C21D1/26C21D8/00
CPCC21D1/25C21D1/26C21D1/28C21D8/005C21D2211/00C22C38/002C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C22C38/48
Inventor 潘美辰潘烁贾东洁
Owner YINGKOU SPECIAL STEEL FORGING
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