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Wedge top type ultralow-temperature ball valve

An ultra-low temperature, top-type technology, applied in the field of machinery, can solve the problems of flammability and explosion, volume expansion, medium leakage, etc., and achieve the effect of increasing surface area, reducing impact and reducing friction.

Active Publication Date: 2016-06-01
JIANG SU YAN DIAN FA MEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These media are not only flammable and explosive, but also gasify when the temperature rises or flashes, and the volume expands rapidly when gasified. pressure, resulting in medium leakage, or even valve cracking and accidents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A wedge-top ultra-low temperature ball valve prepared by the following method:

[0037] (1) Determine the chemical element composition of stainless steel, according to the weight percentage: carbon: 0.02%, silicon: 0.15%, manganese: 0.7%, nickel: 0.5%, chromium: 19%, molybdenum: 4%, copper: 0.5%, Boron: 0.05%, phosphorus: 0.05%, nitrogen: 0.3%, and the rest is Fe;

[0038] (2) Smelting: put the raw materials in the above ratio into the vacuum induction furnace, melt and melt at 1700 °C, after the melting is over, take samples for analysis, and deoxidize slagging, reduce the steel temperature during deoxidizing slagging, and control the steel temperature at 1450°C, after the analysis results meet the requirements, add Al-5Ti-B, Al-10Sr and RE three metal refinement modifiers, the weight percentage ratio of the three added is 8:2:1, refining to slag white, improving The tapping temperature is 1650°C, and the tapping is poured into the ladle, and the molten steel pouring ...

Embodiment 2

[0053] A wedge-top ultra-low temperature ball valve prepared by the following method:

[0054] (1) Determine the chemical element composition of stainless steel, according to the weight percentage: carbon: 0.05%, silicon: 0.10%, manganese: 1.1%, nickel: 0.5%, chromium: 15%, molybdenum: 4%, copper: 0.5%, Boron: 0.05%, phosphorus: 0.05%, nitrogen: 0.3%, and the rest is Fe;

[0055] (2) Smelting: Put the raw materials in the above ratio into the vacuum induction furnace, melt and melt at 1850 °C, after the melting is over, take samples for analysis, and deoxidize slag, reduce the steel temperature during deoxidation and slagging, and control the steel temperature at 1400°C, after the analysis results meet the requirements, add Al-5Ti-B, Al-10Sr and RE three metal refinement modifiers, the weight percentage ratio of the three added is 8:2:1, refining to slag white, improving The tapping temperature is 1650°C, and the tapping is poured into the ladle, and the molten steel pouring ...

Embodiment 3

[0070] A wedge-top ultra-low temperature ball valve prepared by the following method:

[0071] (1) Determine the chemical element composition of stainless steel, according to the weight percentage: carbon: 0.03%, silicon: 0.14%, manganese: 0.8%, nickel: 0.5%, chromium: 18%, molybdenum: 4%, copper: 0.5%, Boron: 0.05%, phosphorus: 0.05%, nitrogen: 0.3%, and the rest is Fe;

[0072] (2) Smelting: put the raw materials in the above ratio into the vacuum induction furnace, melt and melt at 1750 °C, after the melting is completed, take samples for analysis, and deoxidize slagging, reduce the steel temperature during deoxidation and slagging, and control the steel temperature at 1449°C, after the analysis results meet the requirements, add Al-5Ti-B, Al-10Sr and RE three metal refinement modifiers, the weight percentage ratio of the three added is 8:2:1, refining to slag white, improving The tapping temperature is 1650°C, and the tapping is poured into the ladle, and the molten steel...

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Abstract

The invention discloses a wedge top type ultralow-temperature ball valve and a preparation method. Chemical element components of stainless steel are determined in percentage by weight as follows: 0.02-0.5% of carbon, 0.10-0.15% of silicon, 0.7-1.1% of manganese, 0.5% of nickel, 15-19% of chromium, 4% of molybdenum, 0.5% of copper, 0.05% of boron, 0.05% of phosphorus, 0.3% of nitrogen, and the balance of Fe. The wedge top type ultralow-temperature ball valve has unexpected ultralow-temperature performance. A welding line between a butt-welded end of a valve body and a short pipe has an impact value of below -285 DEG C. A welding process qualification report can refer to the ASMEB31.3 standard requirements; the V-shaped impact test below -285 DEG C is performed; and the transverse expansion value of standard sample test is lower than 0.25 mm.

Description

technical field [0001] The invention relates to a wedge-top ultra-low temperature ball valve and a production method thereof, belonging to the field of machinery. Background technique [0002] As a clean fuel, liquefied natural gas (LNG) has become one of the main energy sources for urban pipeline gas supply, distributed energy systems, automobiles and airplanes. LNG is the product of cooling and liquefaction of natural gas in a purified and ultra-low temperature state (-162°C, one atmospheric pressure). The volume of liquefied natural gas is about 1 / 600 of the volume of natural gas (at 0°C and 1 atmospheric pressure). LNG is colorless and odorless, the main component is methane, and there are few other impurities. Its liquid density is about 426kg / m3, and the gas density is about 1.5kg / m3 at this time. The explosion limit is 5% to 15% (volume %), and the ignition point is 450°C. The construction of supporting equipment for natural gas liquefaction, transportation, stora...

Claims

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Application Information

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IPC IPC(8): B23P15/00B23P23/04C22C38/44C22C38/42C22C38/32C22C38/04C21D8/02C23C24/10F16K5/06F16K5/08
CPCB23P15/00B23P23/04C21D8/02C22C38/04C22C38/32C22C38/42C22C38/44C23C24/10F16K5/06F16K5/08B23P15/001C21D8/0236C22C38/001
Inventor 李海伟
Owner JIANG SU YAN DIAN FA MEN CO LTD
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