YUAN LiYuedian Zhuhai Power Plant. INFLUENCE OF LOWERING ALLOWABLE STRESS FOR T122 STEEL UPON SAFETY OF BOILERS[J]. Thermal power generation, 2009, 38(7): 10-13.
YUAN LiYuedian Zhuhai Power Plant. INFLUENCE OF LOWERING ALLOWABLE STRESS FOR T122 STEEL UPON SAFETY OF BOILERS[J]. Thermal power generation, 2009, 38(7): 10-13.DOI:
T122钢许用应力下降对锅炉安全的影响
摘要
ASME于2006年8月降低了Case 2180-4(即SA213-T122
T122)钢的许用应力
这对已经使用T122钢管材的锅炉的安全运行产生了极大的影响。在2007年
通过对粤电珠海电厂2台2000年投产的锅炉T122钢锅炉管的金属检查
发现部分T122钢管材硬度明显下降
焊接接头的寿命明显低于母材;由T122钢管的许用应力计算的管壁厚度已不能满足ASME规范的要求
存在着较大的安全隐患。
Abstract
The allowable stress of T122 steel had been lowered by ASME in August
2006
resulting in extreme influence upon safe operation of boilers already adopted the said steel.In 2007
through metal inspection of T122 steel tubes in two boilers
which had been put into operation in 2000 at Zhuhai Power Plant
it has been discovered that the hardness of some tube materials has substantially lowered
the service life of weld joints bing remarkably below that of base material
the thickness of tube-wall calculated according to allowable stress of T122 steel already can't satisfy the requirement in ASME code