Steel for petroleum valve body and preparation method thereof

A valve body and petroleum technology, applied in metal rolling, manufacturing tools, temperature control, etc., can solve problems such as unsatisfactory impact energy, achieve good comprehensive mechanical properties, improve internal quality, and improve the effect of low-temperature impact performance

Pending Publication Date: 2021-06-25
JIANGSU LIANFENG ENERGY EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The round steel obtained by this method can meet the requirement of impact energy ≥ 27J at -46°C, but cannot meet the requirement of impact energy ≥ 30J at -60°C

Method used

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  • Steel for petroleum valve body and preparation method thereof
  • Steel for petroleum valve body and preparation method thereof
  • Steel for petroleum valve body and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A steel for petroleum valve body, including the following components by mass percentage: C: 0.32%, Si: 0.25%, Mn: 0.73%, P: 0.008%, S: 0.003%, Cr: 1.02%, Ni: 0.21%, Mo: 0.23%, Cu: 0.02%, Al: 0.025%, V: 0.016%, Nb: 0.010%, As: 0.0036%, Sn: 0.0007%, Sb: 0.0024%, Bi: 0.0006%, Pb: 0.001%, Ti: 0.0017%, H: 0.00008%, O: 0.0015%, N: 0.0066%, and others are Fe and unavoidable impurities.

[0025] The preparation method of the steel for the above-mentioned petroleum valve body comprises the following steps:

[0026] (1) electric furnace smelting

[0027] It is smelted in a 110-ton ultra-high-power electric arc furnace. In order to control harmful elements such as As, Sn, Sb, Bi, and Pb in molten steel, high-quality molten iron + scrap steel is selected, and hot-metal hot charging technology is adopted, and the hot-metal hot-charging ratio is ≥80%. . The electric furnace smelting process uses oxygen blowing on the furnace wall and carbon powder injection to stably control the e...

Embodiment 2

[0042] A steel for petroleum valve body, including the following components by mass percentage: C: 0.28%, Si: 0.28%, Mn: 0.76%, P: 0.008%, S: 0.002%, Cr: 1.06%, Ni: 0.48%, Mo: 0.22%, Cu: 0.02%, Al: 0.025%, V: 0.014%, Nb: 0.013%, As: 0.0035%, Sn: 0.0006, Sb: 0.0023, Bi: 0.0006%, Pb: 0.001%, Ti: 0.0016%, H: 0.00010%, O: 0.0011%, N: 0.0057%, and others are Fe and unavoidable impurities.

[0043] The preparation method of steel for above-mentioned petroleum valve body, except following difference, all the other are identical with embodiment 1,

[0044] (1) In the electric furnace smelting step: tapping end point C: 0.11%, tapping temperature: 1620°C.

[0045] (2) In the LF refining step: the retention time of white slag is 55 minutes.

[0046] (3) In the VD vacuum treatment step: the vacuum degree is 47Pa, the holding time is 19min, and the soft blowing time is 46min.

[0047] (4) In the continuous casting step: the degree of superheat is 23°C.

[0048] (5) In the rolling step...

Embodiment 3

[0050] A steel for petroleum valve body, including the following components by mass percentage: C: 0.31%, Si: 0.30%, Mn: 0.75%, P: 0.004%, S: 0.002%, Cr: 1.08%, Ni: 0.35%, Mo: 0.23%, Cu: 0.01%, Al: 0.026%, V: 0.011%, Nb: 0.018%, As: 0.0034%, Sn: 0.0005%, Sb: 0.0022%, Bi: 0.0006%, Pb: 0.001%, Ti: 0.0015%, H: 0.00007%, O: 0.0007%, N: 0.0059%, and others are Fe and unavoidable impurities.

[0051] The preparation method of steel for above-mentioned petroleum valve body, except following difference, all the other are identical with embodiment 1,

[0052] (1) In the electric furnace smelting step: tapping end point C: 0.14%, tapping temperature: 1624°C.

[0053] (2) In the LF refining step: the retention time of white slag is 60 minutes.

[0054] (3) In the VD vacuum treatment step: the vacuum degree is 50Pa, the holding time is 17min, and the soft blowing time is 37min.

[0055] (4) In the continuous casting step: degree of superheat: 25°C.

[0056] (5) In the rolling step: th...

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PUM

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Abstract

The invention discloses steel for a petroleum valve body and a preparation method thereof. The steel comprises C, Si, Mn, P, S, Cr, Mo, Ni, 0.01-0.02% of Nb, 0.01-0.02% of V, Al, Cu, Ti, As, Sn, Sb, Pb, Bi, H, O, N, Fe and inevitable impurities. The preparation method comprises the steps of electric furnace smelting, LF refining, VD vacuum treatment, continuous casting and rolling. By adding V and Nb microalloying elements, precipitation strengthening and fine grain strengthening are promoted, the strength and toughness of the material are improved, especially the low-temperature impact toughness is improved, and smelting, continuous casting and rolling process parameters are controlled in the preparation process, so that the steel has high purity, compact structure and good mechanical performance, and the requirement of deep sea oil exploitation is met.

Description

technical field [0001] The invention belongs to the technical field of steel materials, and in particular relates to a steel for petroleum valve bodies and a preparation method thereof. Background technique [0002] Petroleum valve body is a steel material widely used in the field of petroleum exploitation. With the rapid development of the world economy, the consumption of petroleum is increasing day by day. In order to meet the market demand, oil exploration is developing into the deep sea field, which requires that the oil valve body should have higher strength, toughness and corrosion resistance. Currently, the oil valve body used in deep sea oil extraction generally requires impact at -60°C Work ≥ 30J. [0003] Invention patent CN110438390A discloses a Φ280mm large-size round bar steel for oil pipeline valve body and its production method. It discloses chemical composition C: 0.30-0.33%, Si: 0.20-0.35%, Mn: 0.65-0.70%, Cr: 1.00~1.10%, Ni: 0.20~0.25%, Mo: 0.20~0.25%, V...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/60C21C7/00C21C7/06C21C7/10C22C33/04B21B1/18B21B37/74B21B45/00B21B45/08
CPCC22C38/02C22C38/04C22C38/002C22C38/44C22C38/48C22C38/46C22C38/06C22C38/42C22C38/50C22C38/008C22C38/60C22C38/001C22C33/04C21C7/06C21C7/10C21C7/0006B21B1/18B21B45/004B21B45/08B21B37/74
Inventor 杨凯军付化刚轩康乐江宏亮何军何鑫宇张春香
Owner JIANGSU LIANFENG ENERGY EQUIP
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