东北石油大学本科生毕业设计(论文)摘要本文介绍了低合金耐热钢在化工设备中的应用，并对低合金耐热钢的焊接特点和焊接性进行分析，论述了低合金耐热钢的焊接工艺以及焊接接头力学性能的控制。在查阅文献和结合现场焊接工艺的基础上，分析了低合金耐热钢2.25Cr-1Mo的焊接特点与焊接性，通过对其碳当量、冷裂纹敏感指数的计算，确定了预热温度，并确定了焊接方法、焊接热参数以及焊后热处理工艺，制定了2.25Cr-1Mo钢制加氢反应器的焊接规范，完成2.25Cr-1Mo钢的焊接性试验。对2.25Cr-1Mo钢的焊接接头进行金相组织观察与分析，并进行力学性能试验与分析，完成了2.25Cr-1Mo钢的焊接性研究。关键词：低合金耐热钢；焊接性；2.25Cr-1Mo钢；焊接工艺东北石油大学本科生毕业设计(论文)AbstractThispaperintroducestheheat-resistantlow-alloysteelapplicationsinchemicalequipment,analyzestheweldingfeaturesandweldabilityoftheheat-resistantlow-alloysteel,anddiscussestheweldingprocessoftheheat-resistantlow-alloysteelandthecontrolofmechanicalpropertiesofweldjoints.Basedontheliteratureandcombinedwithon-siteweldingprocess,theweldingfeaturesandweldabilityoftheheat-resistantlow-alloysteel2.25Cr-1Mowasanalyzed.Throughcalculatingitscarbonequivalentandcoldcrackingsensitivityindex,thepreheatingtemperature,weldingmethod,weldingthermalparametersandheattreatmentafterweldingweredetermined,andtheweldingstandardofthehydrogenationreactormadeby2.25Cr-1Mosteelwasdeterminedandtheweldingtestofthe2.25Cr-1Mosteelwascompleted.Byobservingandanalyzingthemicrostructureofweldjoint,andtestingandanalyzingmechanicalproperties,theweldingstudyof2.25Cr-1Mosteelwascompleted.Keywords:heat-resistantlow-alloysteel;weldability;2.25Cr-1Mosteel;weldingprocess东北石油大学本科生毕业设计(论文)目录第1章低合金耐热钢在化工设备中的应用..................................................................11.1低合金耐热钢的化学成分及性能特点..............................................................11.2化工设备对耐热钢焊接接头的性能要求..........................................................4第2章低合金耐热钢的焊接性分析............................................................................62.1低合金耐热钢的焊接特点..................................................................................62.2低合金耐热钢的焊接工艺..................................................................................92.3低合金耐热钢焊接接头性能控制....................................................................152.4不同低合金耐热钢接头的焊接........................................................................20第3章2.25Cr-1Mo钢焊接性分析..............................................................................233.12.25Cr-1Mo钢的化学成分及力学性能............................................................233.22.25Cr-1Mo钢的焊接特点................................................................................243.32.25Cr-1Mo钢焊接的技术要求........................................................................24第4章2.25Cr-1Mo焊接性试验及焊接工艺评定......................................................274.1焊接性试验材料准备........................................................................................274.22.25Cr-1Mo钢焊接工艺试验............................................................................284.32.25Cr-1Mo钢焊接接头的金相组织试验及分析............................................324.42.25Cr-1Mo钢焊接接头力学性能试验及分析.................................................
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