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Steel for drilling tools and method for smelting steel for drilling tools

A technology for drilling tools and molten steel is applied in the fields of steel for drilling tools and steel for smelting drilling tools. and the effect of toughness

Active Publication Date: 2013-05-22
PANGANG GROUP RESEARCH INSTITUTE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The purpose of the present invention is to solve the problem that the steel for drilling tools in the prior art cannot take into account the high strength and good plastic toughness. To solve the problem of low toughness, a kind of steel for drilling tools with higher strength and higher toughness and its preparation method are provided

Method used

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  • Steel for drilling tools and method for smelting steel for drilling tools
  • Steel for drilling tools and method for smelting steel for drilling tools
  • Steel for drilling tools and method for smelting steel for drilling tools

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] This example is used to illustrate the properties of the steel for drilling tools smelted by method 1).

[0060] (1) blowing and tapping

[0061] The desulfurized molten iron is poured into the oxygen top-blown converter for blowing, and the oxygen supply of the top-blown oxygen is 22,700 standard cubic meters per hour (the oxygen supply intensity is 2.8Nm 3 / ton of molten steel min), blowing for 28 minutes, based on the total weight of molten steel, the end point of blowing is controlled to be 0.08% by weight of C content, 0.008% by weight of P content, and 0.007% by weight of S content, and the molten steel obtained by blowing is discharged The steel is put into the ladle, and the tapping temperature is 1700°C.

[0062] When tapping, with respect to every ton of molten steel, 3.0 kilograms of deoxidizer aluminum-iron (Al content ≥ 40% by weight, Anyang Hengwang Metallurgical Refractories Co., Ltd.) is first added, and the amount of the deoxidizer makes the activity ...

Embodiment 2

[0071] This example is used to illustrate the properties of the steel for drilling tools smelted by method 1).

[0072] The method identical with embodiment 1 prepares drill steel, difference is:

[0073] (1) blowing and tapping

[0074] The desulfurized molten iron is poured into the oxygen top-blown converter for blowing, and the oxygen supply of the top-blown oxygen is 20,000 standard cubic meters per hour (the oxygen supply intensity is 2.5Nm3 / ton of molten steel min), blowing for 20 minutes, based on the total weight of molten steel, the end point of blowing is controlled to be 0.19% by weight of C content, 0.013% by weight of P content, and 0.010% by weight of S content, and the molten steel obtained by blowing is discharged The steel is put into the ladle, and the tapping temperature is 1670°C.

[0075] When tapping, with respect to every ton of molten steel, 2.6 kilograms of deoxidizer aluminum iron (Al content ≥ 40% by weight, Anyang Hengwang Metallurgical Refracto...

Embodiment 3

[0083] This example is used to illustrate the properties of the steel for drilling tools smelted by method 1).

[0084] The method identical with embodiment 1 prepares drill steel, difference is:

[0085] (1) blowing and tapping

[0086] The desulfurized molten iron is poured into the oxygen top-blown converter for blowing, and the oxygen supply of the top-blown oxygen is 24,000 standard cubic meters per hour (the oxygen supply intensity is 3.0Nm 3 / ton of molten steel min), blowing for 25 minutes, taking the total weight of molten steel as a basis, the end point of blowing is controlled to be 0.10% by weight of C content, 0.009% by weight of P content, and 0.008% by weight of S content, and the molten steel obtained by blowing is discharged The steel is put into the ladle, and the tapping temperature is 1680°C.

[0087] When tapping, it is equivalent to every ton of molten steel, first add 2.0 kilograms of deoxidizer aluminum-iron (Al content ≥ 40% by weight, Anyang Hengwa...

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Abstract

The invention discloses a steel for drilling tools and a method for smelting steel for drilling tools. On the basis of the total weight of the steel for drilling tools, the steel comprises 0.4-0.49 wt% of C, 0.15-0.37 wt% of Si, 1-1.3 wt% of Mn, 1-1.3 wt% of Cr, 0.2-0.3 wt% of Mo, 0.02-0.04 wt% of Al, 0.25-0.5 wt% of Ni, at most 0.015 wt% of P, at most 0.015 wt% of S, at most 0.2 wt% of Cu, at most 0.05 wt% of Sn, at most 0.05 wt% of As, at most 0.0002 wt% of H, at most 0.009 wt% of N and the balance of iron. The T[O] content in the steel for drilling tools is at most 0.002 wt%. The steel for drilling tools disclosed by the invention has higher strength, ductility and toughness than the steel for drilling tools provided by the prior art. Thus, the invention provides the steel for drilling tools with high strength, high toughness and favorable fatigue resistance on the premise of not greatly increasing the steel product production cost.

Description

technical field [0001] The invention relates to a steel for a drilling tool and a method for smelting the steel for a drilling tool, in particular to a steel for a drilling tool with high strength and high toughness and a method for smelting the steel for a drilling tool. Background technique [0002] Drilling tools are the general term for the entire drilling pipe string and its joints used in the drilling construction (excluding the casing for hole protection). The drilling tool is composed of active drill pipe, drill collar, core pipe, reamer and drill bit at the bottom, and if necessary, a sedimentation pipe or drill collar is added to the upper part of the core pipe. The function of the drilling tool is mainly to transmit the drill bit pressure and rotary torque to the drill bit in the process of drilling the rock formation, and deliver the drilling flushing fluid to the bottom of the hole to collect the rock core. With the development of directional drilling in deep w...

Claims

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Application Information

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IPC IPC(8): C22C38/42C21C7/06
Inventor 代华云寄海明雷秀华邓通武郭华李清春
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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