大侠、機器のパラメータが何を意味するのか教えてください
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鋼管:Dg80YB804-70、Dg100YB231-70。それ以外に何か違いはありますか?フランジ:Pg6、Dg100、HG5010-58
支持部品:JB/T4725-92
材料:Q253-A、0Gr18Ni9、もう一つは1Grだったと思うのですが忘れました。どこが違うのでしょうか?専門家の方、ご教示ください
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