化工设备与管道
化工設備與管道
화공설비여관도
PROCESS EQUIPMENT DESIGN
2015年
4期
67-70,81
,共5页
20控Cr%碳钢管%冲击功%热处理
20控Cr%碳鋼管%遲擊功%熱處理
20공Cr%탄강관%충격공%열처리
20+Cr%carbon steel pipe%impact energy%heat treatment
20控Cr优质碳钢管广泛应用于核电站管路系统和化学工业炉上有蒸汽冲刷的管道系统，在管件加工、配管过程中不可避免地采用了高效、便捷的火焰切割方法。通过对20控Cr碳钢管在火焰切割与锯切后的化学成分、力学性能、金相试样对比发现，火焰切割将带来-20℃冲击功不满足技术要求、晶粒长大、铁素体与珠光体偏析等系列问题，火焰切割影响范围超过30 mm。正火（890~930℃）热处理校正工艺工程应用试验表明，经过正火热处理校正后，可将受到火焰切割影响的-20℃冲击功数值恢复到正常水平；同时，粗大的晶粒得以细化，晶粒度在8~9之间，碳化物分布均匀化。
20控Cr優質碳鋼管廣汎應用于覈電站管路繫統和化學工業爐上有蒸汽遲刷的管道繫統，在管件加工、配管過程中不可避免地採用瞭高效、便捷的火燄切割方法。通過對20控Cr碳鋼管在火燄切割與鋸切後的化學成分、力學性能、金相試樣對比髮現，火燄切割將帶來-20℃遲擊功不滿足技術要求、晶粒長大、鐵素體與珠光體偏析等繫列問題，火燄切割影響範圍超過30 mm。正火（890~930℃）熱處理校正工藝工程應用試驗錶明，經過正火熱處理校正後，可將受到火燄切割影響的-20℃遲擊功數值恢複到正常水平；同時，粗大的晶粒得以細化，晶粒度在8~9之間，碳化物分佈均勻化。
20공Cr우질탄강관엄범응용우핵전참관로계통화화학공업로상유증기충쇄적관도계통，재관건가공、배관과정중불가피면지채용료고효、편첩적화염절할방법。통과대20공Cr탄강관재화염절할여거절후적화학성분、역학성능、금상시양대비발현，화염절할장대래-20℃충격공불만족기술요구、정립장대、철소체여주광체편석등계렬문제，화염절할영향범위초과30 mm。정화（890~930℃）열처리교정공예공정응용시험표명，경과정화열처리교정후，가장수도화염절할영향적-20℃충격공수치회복도정상수평；동시，조대적정립득이세화，정립도재8~9지간，탄화물분포균균화。
20+Cr carbon steel pipes are widely used in the pipeline of the nuclear power plant and the pipeline, which is eroded by steam, of chemical industrial furnace. The highly efficient and convenient flame cutting technology is often used in pipe matching and machining. By comparing the chemical compositions, mechanical properties and metallurgical constitution for both flame cutting and sawing on 20+Cr carbon steel pipes, it had been revealed that flame cutting will bring in several problems, such as unqualified-20 ℃impact energy, coarse grains and the segregation of ferrite and pearlite. The heat-affected zone by flame cutting will be as large as 30mm. The heat treatment experiment of normalization under temperature of 890~930℃indicated that after normalizing heat treatment,-20℃impact energy of the steel had been recovered to the normal level. In addition, the coarse grains would be refined to grain size of grade 8-9 and carbides homogeneously distributed.
