低合金高強度鋼作為近幾十年發(fā)展很快且生產(chǎn)量大、使用面廣的工程結(jié)構(gòu)材料，至今世界各國還沒有共同認可的定義和分類?，F(xiàn)就我國的國外一些主要及組織的標準中有關(guān)規(guī)定簡介如下：標準有關(guān)規(guī)定根據(jù)標準GB/T1334《鋼分類》部分“鋼按化學(xué)成分分類”，低合金鋼合金元素含量的規(guī)定界限值如表1-1-4所示。合金元素含量的規(guī)定標準、技術(shù)條件或訂單對鋼的熔煉分析化學(xué)成分規(guī)定值或范圍時，應(yīng)以值作為規(guī)定含量進行分類。
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鈦鐵礦的酸解工藝操作，工業(yè)出產(chǎn)中一般選用固相法工藝，一般有如下3種操作辦法。高溫法先把濃硫酸放入酸解罐內(nèi)，在壓縮空氣拌和下將計量好的鈦鐵礦投入酸解罐內(nèi)并拌和均勻，然后添加核算好的稀釋水，運用硫酸稀釋放出的熱量，再用蒸汽加熱到必定溫度后開端酸解反響。低溫法先在酸解罐內(nèi)把計量好的濃硫酸稀釋到工藝規(guī)則的濃度和溫度后，把計量好的鈦鐵礦在壓縮空氣拌和下投入酸解罐中，拌和均勻后開直接蒸汽引發(fā)酸解反響。
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