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A flange for high-pressure hydrogen-facing conditions

A technology using flanges and working conditions, applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of personnel and equipment loss, can not guarantee hydrogen resistance performance, etc., to avoid production accidents, improve room temperature and high temperature mechanical properties, save money cost effect

Active Publication Date: 2016-05-25
WUXI HUAERTAI MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydrogen resistance performance cannot be guaranteed. If the flange in the high-pressure hydrogenation unit system leaks, it will easily cause a spontaneous combustion explosion, resulting in the loss of personnel and equipment. Therefore, it is urgent to find a flange for high-pressure hydrogenation conditions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] This embodiment provides a flange for high-pressure hydrogen-facing conditions. The mass percentages of the flange components are: Ni: 11%, Li: 12%, Si: 1.65%, Al: 0.15%, C: 0.26%, Mn: 0.15%, Na: 0.05%, K: 0.22%, P: 0.003%, Cu: 0.7%, Mg: 0.55%, compound rare earth: 3.25%, the rest is Fe and unavoidable impurities; in compound rare earth, by weight percentage Contains the following components: La: 25%, Dy: 18.5%, Pm: 12.3%, Gd: 1.2%, Sm: 22%, Nd: 8.3%; the rest is Ce and unavoidable impurities;

[0025] The heat treatment process of the flange for the high pressure hydrogen working condition is carried out according to the following steps:

[0026] Step (1): Send the raw materials into the forging furnace for forging, and the forging manufacturing standard of the flange is Class III; control the final forging temperature and forging ratio, the final forging temperature is 910°C, and the forging ratio is 4;

[0027] Step (2): When the material is carbon steel, use normal...

Embodiment 2

[0032] This embodiment provides a flange for high-pressure hydrogen-facing working conditions. The mass percentage of the flange composition is: Ni: 11.5%, Li: 12.3%, Si: 1.68%, Al: 0.18%, C: 0.25%, Mn: 0.18%, Na: 0.06%, K: 0.25%, P: 0.004%, Cu: 0.8%, Mg: 0.58%, compound rare earth: 3.26%, the rest is Fe and unavoidable impurities; in compound rare earth, by weight percentage Contains the following components: La: 26%, Dy: 18.6%, Pm: 12.4%, Gd: 1.3%, Sm: 24%, Nd: 8.4%; the rest is Ce and unavoidable impurities;

[0033] The heat treatment process of the flange for the high pressure hydrogen working condition is carried out according to the following steps:

[0034] Step (1): Send the raw materials into the forging furnace for forging. The forging manufacturing standard of the flange is not lower than Class III; control the final forging temperature and forging ratio, the final forging temperature is 920°C, and the forging ratio is 5;

[0035] Step (2): When the material is carb...

Embodiment 3

[0040] This embodiment provides a flange for high-pressure hydrogen-facing conditions. The mass percentages of the flange components are: Ni: 11.8%, Li: 12.5%, Si: 1.7%, Al: 0.2%, C: 0.28%, Mn: 0.2%, Na: 0.08%, K: 0.28%, P: 0.005%, Cu: 0.9%, Mg: 0.6%, compound rare earth: 3.28%, the rest is Fe and unavoidable impurities; in compound rare earth, by weight percentage Contains the following components: La: 28%, Dy: 18.8%, Pm: 12.5%, Gd: 1.5%, Sm: 25%, Nd: 8.5%; the rest is Ce and unavoidable impurities;

[0041] The heat treatment process of the flange for the high pressure hydrogen working condition is carried out according to the following steps:

[0042] Step (1): Send the raw materials into the forging furnace for forging. The forging manufacturing standard of the flange is not lower than Grade III; control the final forging temperature and forging ratio, the final forging temperature is 960°C, and the forging ratio is 6;

[0043] Step (2): When the material is carbon steel,...

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Abstract

A disclosed flange applied under a high-pressure hydrogen-atmosphere condition comprises the compositions in percent by mass: 11-11.8% of Ni, 12-12.5% of Li, 1.65-1.7% of Si, 0.15-0.2% of Al, 0.26-0.28% of C, 0.15-0.2% of Mn, 0.05-0.08% of Na, 0.22-0.28% of K, 0.003 -0.005% of P, 0.7-0.9% of Cu, 0.55-0.6% of Mg, 3.25-3.28% of composite rear earth, and the balance Fe. The heat treatment technology of the flange comprises the steps: step (1) sending raw materials into a calcining furnace for calcining; step (2) performing heat treatment on the calcined flange blank; step (3) performing stretching and impact experiments on the flange; step (4) performing 100% ultrasonic detection; and step (5) performing 100% magnetic-powder flaw detection.

Description

technical field [0001] The invention relates to a flange for a high-pressure hydrogen working condition, in particular to a flange for a high-pressure hydrogen working condition. Background technique [0002] At present, the high-pressure hydrogenation unit is the focus and hotspot of oil refining, which is to use hydrogenation technology to improve quality and efficiency. Most of the various hydrogen-facing parts on the device are steel castings due to their complex shapes. The working conditions are characterized by hydrogen exposure, high temperature, high pressure, and the operation accompanied by hydrogen sulfide. Hydrogen corrodes metals in a hydrogen-facing environment. Atomic hydrogen and molecular hydrogen can partially react with carbon or carbides on microcracks or bubble walls in steel to form methane cavities (crack sources) where methane accumulates in micropores. Ordinary stainless steel castings have many microcracks, pores, slag inclusions, and non-metalli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/16C21D8/00C21D9/00
Inventor 李忠云
Owner WUXI HUAERTAI MACHINERY MFG
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