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Bainitic steel for petroleum drilling elevator, and preparation method thereof

A bainitic steel and oil drilling technology, applied in the field of material science, can solve problems such as the inability to meet the service conditions of oil drilling and production equipment, and achieve the effect of good comprehensive mechanical properties

Inactive Publication Date: 2012-10-17
BAOJI PETROLEUM MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a bainitic steel for oil drilling elevators, which solves the problem that the existing high-strength steel has mechanical properties, especially low-temperature toughness, which cannot meet the service conditions of oil drilling equipment under the conditions of quenching and tempering heat treatment. need questions

Method used

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  • Bainitic steel for petroleum drilling elevator, and preparation method thereof
  • Bainitic steel for petroleum drilling elevator, and preparation method thereof
  • Bainitic steel for petroleum drilling elevator, and preparation method thereof

Examples

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preparation example Construction

[0022] The preparation method of the bainitic steel used for the oil drilling elevator of the present invention is implemented according to the following steps:

[0023] Step 1. Weigh each component, and the mass percentage (unit: %) of each component is: 0.1≤C≤0.23, 0.15<Si≤0.4, 1.5<Mn≤1.95, P≤0.02, S≤0.02, 0.7< Cr ≤ 1, 0.9 < Ni ≤ 1.4, 0.3 < Mo ≤ 0.4, 0.1 < V ≤ 0.2, and the rest is Fe; all components are mixed evenly for smelting.

[0024] Step 2. In the ingot forging, there should be enough cutting head and tail cutting to ensure the forging quality, and the forging ratio is ≥ 3.5; after forging, it should be annealed to avoid hydrogen-induced defects, and reduce the hardness to facilitate machining. Round steel required for card products;

[0025] Step 3. Carry out heat treatment to the round steel obtained in step 2. The heat treatment process is: normalizing at 890-910°C and air cooling for 2.5-3.5 hours, tempering at 190-210°C and air cooling for 4.5-5.5 hours.

Embodiment 1

[0027] Step 1. Weigh each component, and the mass percentages (unit: %) of each component are: C is 0.17, Si is 0.3, Mn is 1.60, P is 0.01, S is 0.01, Cr is 0.8, Ni is 1.20, Mo is 0.35, V is 0.13, and the rest is Fe; all components are mixed evenly for smelting.

[0028] Step 2. In the ingot forging, there should be enough cutting head and tail cutting to ensure the forging quality, and the forging ratio is ≥ 3.5; after forging, it should be annealed to avoid hydrogen-induced defects, and reduce the hardness to facilitate machining. Round steel required for card products;

[0029] Step 3. Carry out heat treatment to the round steel obtained in step 2. The heat treatment process is: normalizing at 900°C and air cooling for 3 hours, tempering at 200°C and air cooling for 5 hours.

[0030] Test requirements: the size of the test rod used is an equivalent round test rod with a diameter of φ150mm and a length of 300mm. Then, after the heat treatment of the test bar, the mechanica...

Embodiment 2

[0037]With reference to the process parameters of this embodiment, implement according to the method of embodiment 1.

[0038] Weigh each component, and the mass percentages (in %) are: 0.2 for C, 0.4 for Si, 1.80 for Mn, 0.02 for P, 0.02 for S, 1 for Cr, 1.4 for Ni, 0.3 for Mo, and 0.3 for V. 0.15, the rest is Fe. The heat treatment process is: normalizing at 890°C and air cooling for 3.5 hours, tempering at 210°C and air cooling for 4.5 hours.

[0039] The obtained steel with carbon-free bainite structure has a mechanical property index at half the radius far higher than the requirements of Spec API 8C, and the metallographic microstructure at half the radius of the equivalent test bar is Granular bainitic ferrite, the mechanical properties of the equivalent test bar of φ150mm are: tensile strength Rm=1230MPa, yield strength Rp 0.2 =900MPa, elongation after break A 4 =15.8%, reduction of area Z=58%, impact energy Akv=73J at room temperature, impact energy Akv=43J at -20°C...

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Abstract

The present invention discloses a bainitic steel for a petroleum drilling elevator, and a preparation method thereof. The bainitic steel comprises the following components, by mass, more than or equal to 0.1% and less than or equal to 0.23% of C, more than 0.15% and less than or equal to 0.4% of Si, more than 1.5% and less than or equal to 1.95% of Mn, less than or equal to 0.02% of P, less than or equal to 0.02% of S, more than 0.7% and less than or equal to 1% of Cr, more than 0.9% and less than or equal to 1.4% of Ni, more than 0.3% and less than or equal to 0.4% of Mo, more than 0.1% and less than or equal to 0.2% of V, and the balance of Fe. The present invention further discloses a preparation method for the bainitic steel for the petroleum drilling elevator. Hot treatment process parameters of the preparation method are as follows: a normalizing temperature is 890-910 DEG C, an air cooling time is 2.5-3.5 hours, a tempering temperature is 190-210 DEG C, and an air cooling time is 4.5-5.5 hours. With the material and the preparation of the present invention, the obtained structure comprises granular bainite F and residual austenite, and has good comprehensive mechanical property.

Description

technical field [0001] The invention belongs to the technical field of material science, and relates to a bainitic steel for an elevator for oil drilling, and also relates to a preparation method of the bainitic steel for an elevator for oil drilling. Background technique [0002] In recent years, great progress has been made in the research and application of bainitic steels. As a steel system, bainitic steel has been widely used in many fields such as railways, construction machinery, pressure vessels, railways, ships, containers, etc., and has achieved good practical results. According to the service conditions of oil drilling and production equipment, combined with the excellent characteristics of bainitic steel, the bainitic steel with high strength and good toughness, which is better than the comprehensive mechanical properties of quenched and tempered steel, is studied in actual production. The efficiency of the process has been improved, combined with the service co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C21D1/28
Inventor 余志刚党恩高啸天
Owner BAOJI PETROLEUM MASCH CO LTD