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High-strength seamless steel tube for geological drilling and preparation method thereof

A technology of geological drilling and seamless steel pipes, which is applied in the manufacture of tools, furnaces, heat treatment equipment, etc., can solve the problems of low plasticity index, achieve the effects of improving strength, improving energy use efficiency, and reducing alloy costs

Inactive Publication Date: 2014-01-08
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The performance of the geological drilling steel in this technical solution meets the steel grade requirements of DZ55 in the YB / T5052 standard, and the performance of some drill pipes can meet the steel grade requirements of DZ60, but the elongation of the hot-rolled normalizing state of the steel is only 12 to 15%, and the plastic index is low, so it cannot be used in geological environments with complex environmental conditions

Method used

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  • High-strength seamless steel tube for geological drilling and preparation method thereof
  • High-strength seamless steel tube for geological drilling and preparation method thereof
  • High-strength seamless steel tube for geological drilling and preparation method thereof

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Embodiment Construction

[0047] The high-strength seamless steel pipe for geological drilling according to the present invention and its manufacturing method will be further described below based on specific examples, but the specific examples and related descriptions do not constitute improper limitations to the technical solution of the present invention.

[0048] Embodiment 1~6 and comparative example

[0049] The high-strength geological drilling seamless steel pipe of the present invention is produced according to the following steps:

[0050] 1) Smelting: smelting and controlling the proportion of each chemical element as shown in Table 1;

[0051] 2) Billet making: direct continuous casting of molten steel into round tube billets;

[0052] 3) Manufacture of finished tube: heat the round tube billet to 1250-1300°C in the annular heating furnace, roll the tube at 950-1050°C after piercing through the piercing machine, and heat the rolled steel tube into the reheating furnace to 950-1000°C And k...

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Abstract

The invention discloses a high-strength seamless steel tube for geological drilling. The seamless steel tube comprises the following chemical elements by mass percent: 0.22-0.32% of C, 0.10-0.50% of Si, 1.01-1.19% of Mn, 0.80-1.20% of Cr, 0.10-0.29% of Mo, 0.01-0.05% of V, 0.01-0.04% of Al and the balance of Fe and other inevitable impurities. The invention also discloses a preparation method of the high-strength seamless steel tube for geological drilling. The preparation method comprises the following steps: 1) preparing a finished tube; 2) carrying out quenching and tempering heat treatment on the finished tube; 3) carrying out full-length straightening. The seamless steel tube has yield strength not less than 850Mpa, tensile strength not less than 950Mpa, full-size longitudinal impact energy not less than 50J and elongation not less than 14% and has good lathe thread processability. The preparation method of the seamless steel tube only needs one-time quenching and tempering heat treatment.

Description

technical field [0001] The invention relates to an iron-based alloy steel pipe and a manufacturing method thereof, in particular to a seamless steel pipe and a manufacturing method thereof. Background technique [0002] At present, the shortage of mineral resources is a common problem faced by the whole world. The contradiction between the large demand and insufficient supply of mineral resources in my country has become more prominent. "Strike deep and find blindness" has become the focus of the next round of geological prospecting. Now, geological drilling has developed towards mineral resources with more complex geological conditions and a depth of more than 1,000 meters, which puts forward stricter requirements for the comprehensive performance of drill pipes used for geological drilling; not only requires the production of geological drill pipes The material has a high level of strength, but also has sufficient toughness and plasticity reserves to resist the strong tens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/24C21D9/14C21D1/18
Inventor 左宏志王孝兵武冬兴
Owner BAOSHAN IRON & STEEL CO LTD
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