Preparation method of plate special for hydrogen embrittlement-resistant diaphragm of high-pressure hydrogen diaphragm compressor

Abstract

The invention relates to the field of key material parts of hydrogen energy equipment, in particular to a preparation method of a plate special for a hydrogen embrittlement-resistant diaphragm of a high-pressure hydrogen diaphragm compressor. The plate comprises the following chemical components in percentage by weight: 5.50 to 8.50 percent of Ni, 19.00 to 22.00 percent of Cr, 8.50 to 10.50 percent of Mn, 0.22 to 0.36 percent of N, less than or equal to 0.80 percent of Si and the balance of Fe. The strength and hydrogen embrittlement resistance of the special plate are guaranteed based on nitrogen element solid solution strengthening and grain boundary adjustment and control, and the plate is prepared through the method of vacuum or non-vacuum induction melting, steel mold casting, electroslag remelting, forging, hot rolling, cold rolling, solid solution treatment, small-deformation cold rolling and annealing heat treatment. The width of the plate is not less than 800mm, the thickness is 0.4-0.6 mm, the length is not less than 1000mm, the surface roughness Ra of the plate is less than or equal to 0.6 mum, the unevenness is not more than 10mm / m, the thickness precision is + / -0.05 mm, the yield strengths at room temperature and 200 DEG C can respectively reach more than 350MPa and 240MPa. Meanwhile, the plate has good plasticity, hydrogen embrittlement resistance and fatigue resistance, and can be used for preparing a hydrogen side diaphragm of a 45MPa and more grade hydrogen diaphragm compressor.

Description

technical field [0001] The invention relates to the field of materials for key components of hydrogen energy equipment, in particular to a method for preparing a special plate for a hydrogen embrittlement resistant diaphragm of a high-pressure hydrogen diaphragm compressor. Background technique [0002] Diaphragm compressor (hereinafter referred to as hydrogen compressor) is a special volumetric compressor, which has the characteristics of good sealing, no pollution to the compressed medium, large compression ratio, and easy realization of high pressure. It is indispensable in hydrogen refueling stations. key equipment. Diaphragm is the key part of hydrogen compressor, not only to isolate lubricating oil and compress hydrogen, but also to reciprocate under the pressure transmitted by hydraulic oil, so as to achieve the purpose of boosting. The diaphragm of the hydrogen compressor usually uses a three-layer structure, and the diaphragm on the hydrogen side is mostly made of ...

AI Technical Summary

Problems solved by technology

Engineering practice has found that the 316L diaphragm has a good service life during the service of the hydrogen compressor (design pressure 35MPa) of the 30MPa demonstration hydrogenation station, and as the pressure of the hydrogenation station increases to 45MPa (the design pressure of the hydrogen compressor Pressure 52MPa), the service life of the 316L diaphragm on the hydrogen side is significantly reduced (even less than 1 / 5 to 1 / 10 of the life of the 35MPa hydrogenation machine diaphragm)

The reason is that, on the one hand, under the service conditions of higher hydrogen pressure and alternating temperature, more hydrogen will penetrate into the interior of the 316L diaphragm alloy, causing the diaphragm to be prone to hydrogen-induced fracture failure; on the other hand, , under higher temperature cycle and high pressure conditions than 35MPa hydrogenation machine, the lower high temperature strength of 316L alloy also limits its service life

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