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Alloy steel seamless steel tube for geological drilling and machining method thereof

A technology of seamless steel pipe and geological drilling, applied in the field of seamless steel pipe, can solve the problems of separation layer and surface decarburization, poor impact toughness, poor dimensional accuracy of hot-rolled steel pipe, etc., and achieve high rotational deformation resistance and wear resistance, The effect of good low temperature impact toughness and sufficient safety margin

Inactive Publication Date: 2013-03-06
无锡润丰特种钢管有限公司
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0002] Seamless steel pipes are used for geological exploration or drilling operations. At present, the yield strength, dimensional deviation and low-temperature impact of the highest steel grade specified in the current domestic standards cannot meet the requirements of actual exploration, making geological drilling useless in my country. Seam steel pipes can only rely on imports, and the difficulty in manufacturing such seamless steel pipes lies in:
[0003] (1) The strength caused by the deviation of the chemical composition of the material and the harmful elements cannot be improved, the impact toughness is poor, and the dimensional accuracy of the hot-rolled steel pipe is poor
[0004] (2) Ordinary straightening equipment and straightening methods cannot meet the straightness requirements and the reduction of residual stress. During the piercing process, it is very easy to cause uneven wall thickness, folding, cracks, delamination and surface decarburization of seamless steel pipes. defect

Method used

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Embodiment Construction

[0024] Specific embodiments of the present invention will be described below.

[0025] The chemical composition of the alloy steel seamless steel pipe for geological drilling according to the present invention is as follows by weight percentage: C: 0.25~0.30, Si: 0.17~0.35, Mn: 0.85~1.00, P≤0.012, S≤0.008, Cr: 0.90~ 1.10, Mo: 0.40~0.50, Ni, Cu≤0.1, Alt: 0.015~0.030. Sn, Pb, As, Sb≤0.01, the balance is Fe.

[0026] A method for processing an alloy steel seamless steel pipe for geological drilling, comprising the following steps:

[0027] The first step: using a conventional process to refine the tube blank of the composition described in claim 1;

[0028] Step 2: Segment the above-mentioned tube billets after cooling and place them in a heating furnace for heating. The temperature of the heating furnace is 1240°C to 1280°C;

[0029] Step 3: Hot rolling the tube billet described in step 2 into a seamless steel tube, the hot rolling temperature is 1200°C-1230°C;

[0030] Step...

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Abstract

The invention relates to an alloy steel seamless steel tube for geological drilling and a machining method of the alloy steel seamless steel tube. The alloy steel seamless steel tube manufactured by the method disclosed by the invention is good in comprehensive properties, good in low-temperature impact toughness, and higher in rotational deformation resistance and abrasive resistance, wherein the yield strength of the alloy steel seamless steel tube is more than 1000MPa. After the cold-drawing technology, the thermal treatment technology and the straightening technology are adopted, the mechanical property, the rotational deformation resistance, the low-temperature impact toughness and the abrasive resistance of the seamless steel tube body can reach the standard.

Description

technical field [0001] The invention relates to a seamless steel pipe, in particular to an alloy steel seamless steel pipe for geological drilling and a processing method thereof. Background technique [0002] Seamless steel pipes are used for geological exploration or drilling operations. At present, the yield strength, dimensional deviation and low-temperature impact of the highest steel grade specified in the current domestic standards cannot meet the requirements of actual exploration, making geological drilling useless in my country. Seam steel pipes can only rely on imports, and the difficulty in manufacturing such seamless steel pipes lies in: [0003] (1) The strength caused by the deviation of the chemical composition of the material and the harmful elements cannot be improved, the impact toughness is poor, and the dimensional accuracy of the hot-rolled steel pipe is poor. [0004] (2) Ordinary straightening equipment and straightening methods cannot meet the straig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/60C22C38/44C21D9/08B23P15/00
Inventor 李计珍侯一平周正新杨科夏经宇费彬
Owner 无锡润丰特种钢管有限公司
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