CAJ | 학술논문

结合长管拖车的结构和火灾事故特点，对瓶体常见损伤模式进行分析，并根据损伤程度的不同制定安全评定流程和相应指标。若漆层完好仅发生熏黄、熏黑，可进行正常定期检验；若漆层发生烧黑、碳化或脱落，抛丸后瓶体未发生颜色异常，则对着火部位硬度测定，合格则正常定检，不合格进行金相分析；若抛丸后瓶体颜色发生变化或微量凸起，则进行硬度测定、金相分析和水压试验；若瓶体发现明显变形，则直接判废。硬度评定合格指标为183<HB<269，在269<HB<286范围内的需结合化学成分和金相组织综合评定；金相组织以索氏体为主，不允许出现铁素体和珠光体；水压试验要求容积残余变形率小于10%。
결합장관타차적결구화화재사고특점，대병체상견손상모식진행분석，병근거손상정도적불동제정안전평정류정화상응지표。약칠층완호부발생훈황、훈흑，가진행정상정기검험；약칠층발생소흑、탄화혹탈락，포환후병체미발생안색이상，칙대착화부위경도측정，합격칙정상정검，불합격진행금상분석；약포환후병체안색발생변화혹미량철기，칙진행경도측정、금상분석화수압시험；약병체발현명현변형，칙직접판폐。경도평정합격지표위183<HB<269，재269<HB<286범위내적수결합화학성분화금상조직종합평정；금상조직이색씨체위주，불윤허출현철소체화주광체；수압시험요구용적잔여변형솔소우10%。
Common damage models of cylinder were analyzed according to the structure and ifre accident features. Safety assessment program and relative index were also given according to different degrees of damage. The normal periodic inspection can be conducted if paint layer of the cylinder was just smoking yellow and black. If the paint layer was blackening, charring or dropping out, shot blasting treatment should be taken. Hardness test of ifre location was performed while the color of cylinder was the same before ifre. The periodic inspection can be conducted if the result of hardness was qualiifed, or the metallographic analysis should be given. If the color was changed or micro bulge after ifre, the hardness, microstructure and hydraulic test should be performed. The cylinder should be dammed if the transformation was obvious. Hardness assessment of conformity index was 183<HB<269. Chemical compositions and microstructure should be given to comprehensive assessment if the hardness was 269<HB<286. The proper microstructure was main sorbite, while ferrite and pearlite was not allowed. The ratio of permanent volumetric expansion was less than 10%in hydraulic test.