A stainless steel flange suitable for low temperature working conditions and its production process

Abstract

The invention discloses a stainless steel flange suitable for low-temperature work conditions. The stainless steel flange comprises a through hole and a flange plate. The flange plate comprises a front flange plate body, a middle flange plate set and a rear flange plate body, all of which are sequentially arranged in parallel at equal intervals. The middle flange plate set is composed of two completely identical flange units, and the flange units are symmetric left and right. The diameter of the front flange plate body, the diameters of the flange units and the diameter of the rear flange plate body are equal. The thickness of the front flange plate body and the thickness of the rear flange plate body are the same. The front flange plate body, the flange units and the rear flange plate body are each provided with four fixing holes in the circumferential direction at equal intervals, the hole diameters of the fixing holes are the same, and the positions of the fixing holes correspond to each other. An annular clamping groove is formed in the root of the connecting position of the middle flange plate set and the through hole. The invention further relates to a production technology of the stainless steel flange suitable for the low-temperature work conditions.

Description

technical field [0001] The invention belongs to the technical field of metal processing, and in particular relates to a stainless steel flange suitable for low-temperature working conditions and a production process thereof. Background technique [0002] In the existing natural gas production, in order to facilitate transportation, the natural gas produced in the gas field is often purified and liquefied at ultra-low temperature (-162°C) to form liquefied natural gas (LNG); however, the temperature of the process system is extremely low and the pressure is low. Higher, at present, the low temperature resistant material used in engineering is austenitic stainless steel, but a single austenitic stainless steel such as F316 or F316L has its own advantages and disadvantages, for example: the strength of F316 material is worse than that of F316L material, but it is resistant to intergranular corrosion The performance is not as good as that of the F316L material, so it is difficult ...

AI Technical Summary

Problems solved by technology

[0002] In the existing natural gas production, in order to facilitate transportation, the natural gas produced in the gas field is often purified and liquefied at ultra-low temperature (-162°C) to form liquefied natural gas (LNG); however, the temperature of the process system is extremely low and the pressure is low. Higher, at present, the low temperature resistant material used in engineering is austenitic stainless steel, but a single austenitic stainless steel such as F316 or F316L has its own advantages and disadvantages, for example: the strength of F316 material is worse than that of F316L material, but it is resistant to intergranular corrosion The performance is not as good as that of F316L materials, so it is difficult to find materials that are resistant to intergranular corrosion and have better strength properties at low temperature conditions (the design temperature is -196°C)

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