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A kind of preparation method of crmo alloy steel forged circle resistant to low temperature impact

A technology of alloy steel and low temperature resistance, which is applied in the field of preparation of CrMo alloy steel forging rounds resistant to low temperature impact, and can solve problems such as unreachable

Active Publication Date: 2020-12-29
东北大学无锡研究院
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The oil drilling process requires the drill pipe to have sufficient strength and be able to bear a sufficiently high impact force. For example, the drill pipe made of this type of alloy steel requires Akv ≥ 30J at an ambient temperature of -20°C for low-temperature impact toughness, but In the deep mining of oil, the impact toughness Akv of the alloy steel drill pipe at a low temperature of -60°C is also required to reach more than 30J, which is almost impossible to achieve with the existing conventional methods

Method used

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Embodiment Construction

[0015] One of the examples

[0016] Prepare the typical CrMo steel forged circle of AISI 4130 with the American designation. This steel takes Fe as the basic element, and other elements in the steel are calculated by mass percentage, which are respectively C=0.30~0.33%, Si=0.15~0.35%, Mn=0.55~ 0.60%, P≤0.020%, S≤0.020%, Cr=1.0~1.1%, Ni=0.20~0.25%, Mo=0.20~0.35%, V≤0.035%, Al=0.020~0.050%.

[0017] The preparation method provided by this invention is used to process the typical CrMo steel ingot with the American brand AISI 4130. The single weight of the prepared steel ingot is 5 tons, and the equivalent average diameter is 558mm. After heating + forging + air cooling + normalizing + Rough turning + quenching and tempering treatment to produce a CrMo alloy steel forged circle with a diameter of 310mm. Its manufacturing method is:

[0018] 1) heating up. Heat the steel ingot to 700°C, keep it warm for 2 hours, then heat it to 850°C, keep it warm for 0.5 hours, then heat it to ...

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Abstract

The invention discloses a preparation method for low-temperature-impact-resistant CrMo forged round alloy steel and relates to the technical field of CrMo alloy steel forging and processing. A preparation object of the preparation method comprises alloy steel of AISI 4130, 4130 and 30CrMo. The preparation method is characterized in that an adopted process route comprises the following steps: heating a steel ingot in multistage to 1180-1230 DEG C, keeping the temperature for 3-6.5 hours, then forging and pressing the steel ingot to form at 1200-800 DEG C, and implementing air cooling; and normalizing the steel ingot at 900+ / -10 DEG C, quenching the steel ingot in water at 880+ / -10 DEG C and annealing the steel ingot at a high temperature of 670+ / -10 DEG C, the forged around alloy steel obtains tempered sorbite tissues with good comprehensive performance inside, so that the technical demand that the impact toughness Akv reaches over 30J in a low-temperature environment of 60 DEG C belowzero is met effectively.

Description

technical field [0001] The invention relates to the technical field of forging processing of CrMo alloy steel, in particular to a method for preparing low-temperature impact-resistant CrMo alloy steel forging circles. Background technique [0002] The grade 4130 alloy steel belongs to the steel grade standard of the United States, which is equal to or similar to the two Chinese grades of AISI4130 or 30CrMo produced in China. The alloy steel of these grades belongs to the steel used for oil drill pipes. They are connected to each other through silk openings and gradually extend to the deep underground, so as to meet the needs of oil exploitation. [0003] The oil drilling process requires the drill pipe to have sufficient strength and be able to bear a sufficiently high impact force. For example, the drill pipe made of this type of alloy steel requires Akv ≥ 30J at an ambient temperature of -20°C for low-temperature impact toughness, but In the deep mining of oil, the impact...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/06C21D1/28C21D1/18C21D6/00B21J5/00
CPCB21J5/00C21D1/18C21D1/28C21D6/004C21D6/005C21D6/008C21D8/065
Inventor 刘相华徐国庆杜光远安赛前
Owner 东北大学无锡研究院
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