摘要：<p class="MsoNormal"> 西安<span style="font-family:宋體;">不鏽鋼</span>板<span style="font-family:宋體;">進(jìn)口需要注意的問題</span> <o:p></o:p> </p> <p class="MsoNormal"> 西安<span style="font-family:宋體;">不鏽鋼</span>板<span style="font-family:宋體;">進(jìn)口使用的不鏽鋼材料分進(jìn)口與國產(chǎn)兩種，國產(chǎn)材料，由於使用的是歐洲（</span>ISO<span style="font-family:宋體;">）體係，用成分表示，比較直觀，不容易發(fā)生問題，現(xiàn)在我們重點(diǎn)談?wù)勥M(jìn)口不鏽鋼的一些需要注意的問題： </span><br /> 西安<span style="font-family:宋體;">不鏽鋼</span>板<span style="font-family:宋體;">進(jìn)口材料標(biāo)準(zhǔn)</span> <br /> <span style="font-family:宋體;">現(xiàn)在，我們經(jīng)常見到的進(jìn)口不鏽鋼標(biāo)準(zhǔn)有美國</span>ASME<span style="font-family:宋體;">標(biāo)準(zhǔn)的</span><span style="font-family:'Times New Roman';">SA240</span><span style="font-family:宋體;">、</span><span style="font-family:'Times New Roman';">ASTM</span><span style="font-family:宋體;">標(biāo)準(zhǔn)的</span><span style="font-family:'Times New Roman';">A240</span><span style="font-family:宋體;">以及日本</span><span style="font-family:'Times New Roman';">JIS</span><span style="font-family:宋體;">標(biāo)準(zhǔn)的</span><span style="font-family:'Times New Roman';">SUS</span><span style="font-family:宋體;">；經(jīng)常使用的牌號(hào)為</span><span style="font-family:'Times New Roman';">304</span><span style="font-family:宋體;">、</span><span style="font-family:'Times New Roman';">304L</span><span style="font-family:宋體;">、</span><span style="font-family:'Times New Roman';">316L</span><span style="font-family:宋體;">等。下麵以</span><span style="font-family:'Times New Roman';">304</span><span style="font-family:宋體;">為例來說明它們的表示方法：</span><span style="font-family:'Times New Roman';">JIS</span><span style="font-family:宋體;">標(biāo)準(zhǔn)中材料，表示比較簡單，就是</span><span style="font-family:'Times New Roman';">SUS304</span><span style="font-family:宋體;">這樣表示；</span><span style="font-family:'Times New Roman';">ASME</span><span style="font-family:宋體;">及</span><span style="font-family:'Times New Roman';">ASTM</span><span style="font-family:宋體;">的表示有幾種：</span><span style="font-family:'Times New Roman';">SA240-304</span><span style="font-family:宋體;">、</span><span style="font-family:'Times New Roman';">SA240TP304</span><span style="font-family:宋體;">、</span><span style="font-family:'Times New Roman';">A240-304</span><span style="font-family:宋體;">、</span><span style="font-family:'Times New Roman';">A240TP304</span><span style="font-family:宋體;">，實(shí)際上，中間加</span><span style="font-family:'Times New Roman';">-</span><span style="font-family:宋體;">與加</span><span style="font-family:'Times New Roman';">TP</span><span style="font-family:宋體;">的意思是一樣的。我們提到前麵有</span><span style="font-family:'Times New Roman';">304L</span><span style="font-family:宋體;">的材料，其中</span><span style="font-family:'Times New Roman';">L</span><span style="font-family:宋體;">為後綴，表示含碳量較低；經(jīng)常可以看到的還有</span><span style="font-family:'Times New Roman';">H</span><span style="font-family:宋體;">，表示含碳量較高，主要使用在溫度較高的場合；另外常見的還有</span><span style="font-family:'Times New Roman';">N</span><span style="font-family:宋體;">，表示加元素</span><span style="font-family:'Times New Roman';">N</span><span style="font-family:宋體;">，提高強(qiáng)度。有時(shí)候，我們還可以在後麵見到：</span><span style="font-family:'Times New Roman';">2B</span><span style="font-family:宋體;">，</span><span style="font-family:'Times New Roman';">No.1</span><span style="font-family:宋體;">等後綴，這些後綴表示的是材料的表麵狀態(tài)；</span><span style="font-family:'Times New Roman';">2B</span><span style="font-family:宋體;">表示熱軋加冷軋後，表麵較好，達(dá)到鏡麵要求的</span><span style="font-family:宋體;">鋼板</span><span style="font-family:宋體;">；</span>2D<span style="font-family:宋體;">表示熱軋加冷軋後，表麵一般的鋼板；</span><span style="font-family:'Times New Roman';">No.1</span><span style="font-family:宋體;">表示熱軋表麵。 </span><br /> 西安<span style="font-family:宋體;">不鏽鋼</span>板<span style="font-family:宋體;">進(jìn)口關(guān)於材料的代用</span> <o:p></o:p> </p> <p class="MsoNormal"> <span style="font-family:宋體;">在許多人心目中，材料</span><span style="font-family:'Times New Roman';">“</span><span style="font-family:宋體;">以高代低、以厚代薄</span><span style="font-family:'Times New Roman';">”</span><span style="font-family:宋體;">是天經(jīng)地義的事情，不需要多管，實(shí)際上這種觀點(diǎn)是錯(cuò)誤的，下麵我們以</span><span style="font-family:'Times New Roman';">304</span><span style="font-family:宋體;">、</span><span style="font-family:'Times New Roman';">304L</span><span style="font-family:宋體;">、</span><span style="font-family:'Times New Roman';">304H</span><span style="font-family:宋體;">為例來進(jìn)行說明：一般來看，</span><span style="font-family:'Times New Roman';">304L</span><span style="font-family:宋體;">比</span><span style="font-family:'Times New Roman';">304</span><span style="font-family:宋體;">有更低的含碳量，更好的耐腐蝕性，因此可以代替</span><span style="font-family:'Times New Roman';">304</span><span style="font-family:宋體;">材料使用。確實(shí)</span><span style="font-family:'Times New Roman';">304L</span><span style="font-family:宋體;">滿足</span><span style="font-family:'Times New Roman';">304</span><span style="font-family:宋體;">的要求，而且比</span><span style="font-family:'Times New Roman';">304</span><span style="font-family:宋體;">更好，好像可以自動(dòng)替代</span><span style="font-family:'Times New Roman';">304</span><span style="font-family:宋體;">，但從力學(xué)性能看，</span><span style="font-family:'Times New Roman';">304</span><span style="font-family:宋體;">的強(qiáng)度比</span><span style="font-family:'Times New Roman';">304L</span><span style="font-family:宋體;">高，當(dāng)按</span><span style="font-family:'Times New Roman';">304</span><span style="font-family:宋體;">設(shè)計(jì)時(shí)，用</span><span style="font-family:'Times New Roman';">304L</span><span style="font-family:宋體;">替代，就會(huì)造成強(qiáng)度不夠；另外，在我國壓力容器標(biāo)準(zhǔn)</span><span style="font-family:'Times New Roman';">GB150-1998</span><span style="font-family:宋體;">中</span><span style="font-family:'Times New Roman';">4.1.6</span><span style="font-family:宋體;">條規(guī)定：奧氏體不鏽鋼的使用溫度高於</span><span style="font-family:'Times New Roman';">525</span>℃<span style="font-family:宋體;">時(shí)，鋼中含碳量應(yīng)不小於</span>0.04%<span style="font-family:宋體;">。因此，認(rèn)為</span><span style="font-family:'Times New Roman';">304L</span><span style="font-family:宋體;">可以代替</span><span style="font-family:'Times New Roman';">304</span><span style="font-family:宋體;">使用的觀點(diǎn)是錯(cuò)誤的，能不能使用與使用場合有關(guān)，而且按照容規(guī)規(guī)定，我們都冇有權(quán)進(jìn)行</span><span style="font-family:'Times New Roman';">“</span><span style="font-family:宋體;">材料代用</span><span style="font-family:'Times New Roman';">”</span><span style="font-family:宋體;">，隻有原設(shè)計(jì)部門才可以有權(quán)進(jìn)行</span><span style="font-family:'Times New Roman';">"</span><span style="font-family:宋體;">材料代用</span><span style="font-family:'Times New Roman';">"</span><span style="font-family:宋體;">的工作。</span><o:p></o:p> </p>