液化石油气输送用黄铜管开裂原因分析
FAILURE ANALYSIS OF BRASS TUBE FOR LIQUEFIED GAS TRANSMISSION
摘 要
H62黄铜管用作液化石油气输送管使用不久后,在靠近烧嘴附近产生了开裂。采用等离子光谱、金相、扫描电镜和能谱等方法对黄铜管开裂原因进行了分析。结果表明,黄铜管发生了明显的脱锌现象,基体强度明显降低。黄铜管中有害杂质元素铅含量略微偏高,且分布在晶界,容易引起黄铜管的热脆性。在内应力存在的条件下,黄铜管发生破裂。最后提出了相应的改进的建议。
开裂
脱锌
热脆
Brass H62
Cracking
Dezincification
Thermal brittleness
Abstract
Just after several days of operation,Severe cracks of liquefied gas transmission pipe made from the alloy of H62 brass were discovered near the burner. Several method including ICP-AES,optical microscopy (OM),scanning electronical microscopy (SEM) and energy-dispersive X-ray analysis (EDX) were used to analyze the cracking.The results showed that there was obvious dezincification in the alloy,which had lowed the strength of the alloy. Additionally,the harmful element Pb was a little higher than the standard,which caused thermal brittleness. The alloy failed for the interactions of residual stress in it with corrode substance in liquefied gas. At last,suggestions were proposed to improve the quality of the alloy.
中图分类号 TE832
所属栏目 质量控制与失效分析
基金项目
收稿日期 2007/5/8
修改稿日期
网络出版日期
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备注朱远志(1970-),男,副教授,博士。
引用该论文: ZHU Yuan-zhi,HUANG Rui-yin,PENG Hong. FAILURE ANALYSIS OF BRASS TUBE FOR LIQUEFIED GAS TRANSMISSION[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2008, 44(8): 439～442
朱远志,黄瑞银,彭 鸿. 液化石油气输送用黄铜管开裂原因分析[J]. 理化检验－物理分册, 2008, 44(8): 439～442
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【8】Lu H,Gao K W,Chu W Y. Determination of tensile stress induced by dezincification layer during corrosion for brass［J］. Corrosion Science,1998,40(10):1663-1670．
【9】褚武扬,高克玮,刘亚萍.氢对黄铜脱锌层引起拉应力的影响［J］.中国有色金属学报,2002,12(4):625-628．
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