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Alloy material for petroleum valve rod and preparation method thereof

A technology of alloy materials and valve stems, which is applied in the field of alloy materials for petroleum valve stems and its preparation, can solve problems such as short service life, corrosion cracking, etc., and achieve the effects of prolonging service life, enhancing corrosion resistance, and reducing impurity inclusions

Inactive Publication Date: 2021-03-09
江苏新核合金科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The valve stems used in petroleum production, coal mining and other industries need to have better comprehensive performance. The current petroleum valve stems are prone to corrosion and cracking in harsh environments, and their service life is not long.

Method used

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  • Alloy material for petroleum valve rod and preparation method thereof

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preparation example Construction

[0025] See figure 1 According to another aspect of the present invention, a method for preparing an alloy material for a petroleum valve stem is also provided, comprising the following steps:

[0026] Step S1: Raw material preparation: Proportion the raw materials according to the designed composition, polish the surface of all raw materials, and use them after baking; among them, the raw material nickel plate needs to be baked at 780°C for more than 4 hours. The dosing process needs to strictly control the dosing range of each element to ensure that the control of easily burnt elements is qualified during the electroslag remelting process and avoid the introduction of harmful elements. The operation of polishing the surface of raw materials can remove the oxide film or impurities on the surface of each raw material; baking each raw material can reduce the gas brought in during smelting, improve the purity of the alloy, and improve the overall performance of the alloy.

[002...

Embodiment 1

[0036] The chemical composition of an alloy material for a petroleum valve stem according to Example 1 of the present invention is: C: 0.04%, Si: 0.30%, Mn: 0.25%, P: 0.008%, S: 0.005%, Al: 0.60 %, B: 0.004%, Cr: 19.20%, Mo: 3.05%, Ni: 52.50%, Nb+Ta: 5.10%, Ti: 0.95%, Pb: 0.001%, Bi: 0.0001%, Ag: 0.0004%, Ca : 0.01%, Mg: 0.01%, Cu: 0.15%, Co: 0.90%, and the balance is Fe and unavoidable impurities.

[0037] The preparation method of a kind of alloy material for petroleum valve rod of embodiment 1 of the present invention comprises the following steps:

[0038] Step S1: Raw material preparation: Proportion the raw materials according to the designed composition, polish the surface of all raw materials, and use them after baking; among them, the raw material nickel plate needs to be baked at 780°C for more than 4 hours.

[0039] Step S2: Vacuum smelting: the raw materials are loaded into the furnace, and the furnace loading sequence is as follows: pure iron blocks and nickel bl...

Embodiment 2

[0046] The chemical composition of an alloy material for a petroleum valve stem according to Example 2 of the present invention is: C: 0.05%, Si: 0.28%, Mn: 0.30%, P: 0.010%, S: 0.008%, Al: 0.50 %, B: 0.005%, Cr: 19.50%, Mo: 3.10%, Ni: 52.0%, Nb+Ta: 5.20%, Ti: 1.05%, Pb: 0.001%, Bi: 0.0001%, Ag: 0.0005%, Ca : 0.008%, Mg: 0.008%, Cu: 0.20%, Co: 0.80%, and the balance is Fe and unavoidable impurities.

[0047] The preparation method of a kind of alloy material for petroleum valve rod of embodiment 2 of the present invention comprises the following steps:

[0048] Step S1: Raw material preparation: Proportion the raw materials according to the designed composition, polish the surface of all raw materials, and use them after baking; among them, the raw material nickel plate needs to be baked at 780°C for more than 4 hours.

[0049] Step S2: Vacuum smelting: the raw materials are loaded into the furnace, and the furnace loading sequence is as follows: pure iron blocks and nickel b...

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Abstract

The invention provides an alloy material for a petroleum valve rod. The alloy material for the petroleum valve rod comprises the following chemical components in percentage by weight: 0.04-0.08% of C,not more than 0.35% of Si, not more than 0.35% of Mn, not more than 0.015% of P, not more than 0.015% of S, 0.30-0.80% of Al, 0.002-0.006% of B, 17.0-21.0% of Cr, 2.80-3.30% of Mo, 50.0-55.0% of Ni,4.75-5.50% of Nb+Ta, 0.75-1.15% of Ti, not more than 0.001% of Pb, not more than 0.0005% of Bi, not more than 0.0005% of Ag, not more than 0.01% of Ca, not more than 0.01% of Mg, not more than 0.20% of Cu, not more than 1.0% of Co and the balance of Fe and inevitable impurities. According to the alloy material for the petroleum valve rod, by adopting a vacuum smelting and electroslag remelting duplex smelting method, Ni-Mg alloy is added for deoxidation through refining, so that the alloy purity can be improved, impurity inclusions are reduced, sufficient alloy degassing and uniform metallographic structure and chemical components are guaranteed, the prepared alloy material possesses excellent high-temperature strength, wear resistance and corrosion resistance and is applied to manufacturing of petroleum valve rods, the comprehensive performance of the petroleum valve rod can be improved, and the service life of the petroleum valve rod is prolonged.

Description

technical field [0001] The invention relates to the field of alloy materials, in particular to an alloy material for a petroleum valve stem and a preparation method thereof. Background technique [0002] The valve stem is an important transmission part of the valve, which is connected to the actuator or the handle, and moves or rotates directly under the valve core to realize the switching or adjustment of the valve. During the opening and closing of the valve, the valve stem is not only a moving part, a stressed part, but also a sealing part. At the same time, the valve stem will be impacted and corroded by the medium, and there will be friction with the medium. Therefore, when selecting the valve stem material, it must be ensured that it has sufficient strength, good impact toughness, wear resistance and corrosion resistance at a specific temperature. The valve stems used in petroleum production, coal mining and other industries need to have better comprehensive performa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05C22C1/02C22C1/06C22F1/10C22B9/18
CPCC22B9/18C22C1/023C22C1/06C22C19/058C22F1/10
Inventor 陈杰黄月华华丽平夏东兴张加国
Owner 江苏新核合金科技有限公司
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