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當前位置:首頁 > 相關資訊 > 昆明316L不銹鋼板焊接遇到的問題
昆明316L不銹鋼板焊接遇到的問題
作者:昆明桓秦金屬材料有限公司    來源:http://www.emw118.com    時間:2021/5/7 11:45:36

  昆明316L不銹鋼板焊接會碰到的難題

  昆明316L不銹鋼板歸入馬氏體不銹鋼板,這種鋼具備超卓的塑性變形、耐心、耐蝕性,梳理功能優質。由于加上了Mo原素(2%~3%),昆明316L不銹鋼板不只具備超卓的耐點蝕性、抗應力松弛性、耐熱性,并且冷作硬化功能不錯,故在管路、換熱器、食品機械設備、化工機械設備及石英鐘器材等崗位被普遍應用。因而,討論和掌握316L不銹鋼板的焊接性,具備非常大的實際意義。

  昆明316L不銹鋼板在焊接時非常容易產生下列難題:

  (1)熱裂痕:由于316L不銹鋼板含Cr、Ni等化學元素較多,易與S、P等殘渣組成低溶點化學物質或碳化物硼、硅等的縮松,將促進產生熱裂痕;焊接易組成專一性強的粗壯柱狀晶機構,有益于危害殘渣和原素的縮松,隨后促進組成連續的晶間液膜,提升 了熱裂痕的敏感度;若焊接時加溫不勻稱,則易組成很大的拉應力,促進焊接熱裂痕的產生。

  (2)應力腐蝕:根據貧鉻基礎理論,焊接和熱影響區在加溫到450~850℃敏化溫度區段時,將產生敏化,飽合熱處理回火的碳向晶體間距疏松與位錯周邊的鉻構造成鉻的滲碳體(CrFe)23C6,并在位錯沉積分離出來。鉻分子疏松速度沒有碳快,趕不及從晶內填補到位錯周邊,因而位錯展現貧鉻區,缺失了耐腐蝕功能,在腐蝕物質中工作一段時刻會展現應力腐蝕。


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