The ethylene cracking tubes pack-carburized in a laboratory(P tube) and carburized during servicing in a cracking furnace (S tube) are studied.
对实验室固体渗碳（P管）和裂解炉运行渗碳（S管）的乙烯裂解管进行了研究。
The carburizing damage of HP type ethane cracking tubes after 40000hours of service is analysed using metallographic methods, and the tensile and creep rupture tests are conducted.
对运行了4万h的HP型乙烷裂解炉管的渗碳损伤进行了金相分析，并测定了炉管的力学性能。
It showed that a fast cooling after drawing was of benefit to dimensional stability, straightness, environmental stress cracking resistance, and strength of the drawn tubes.
拉伸时的自然冷却会产生不均匀的产品，快速水冷却拉伸工艺能显著改善管的耐环境应力开裂性，成倍提高其强度。
The failure causes of the finned tubes of an ethylene cracking furnace were analyzed, and some corresponding countermeasures were applied to eliminate the failure possibility.
分析了造成乙烯装置裂解炉翅片管开裂的原因，并在实际生产、维修和设计中采取了相应的对策，消除了再次发生类似问题的可能性。
The results showed that it was chlorine ion that resulted in transgranular stress corrosion cracking in brass tubes.
结果表明，黄铜管的开裂为氯离子引起的穿晶应力腐蚀开裂；
A cracking failure analysis of the spirally welded tubes of the homemade low carbon steel was made.
对一起国产低碳钢螺旋焊管的断裂失效进行了分析。
Thanks to technical efforts, surface cracking of the round bloom is eliminated, which provides a good basis for producing quality seamless steel tubes in terms of material preparation.
通过技术攻关，解决了圆管坯的表面裂纹问题，为生产高质量的无缝钢管提供了优质的原料。
Because of large temperature differences in some local tubes and different expansion coefficients, large stresses of temperature difference are produced and brings about cracking in tubes.
热冲击是由于炉管在某些部位温度变化大，炉管和结焦物的热膨胀系数不同，而产生较大的温差应力，使炉管产生裂纹。
It showed that a fast cooling after drawing was of benefit to dimensional stability, straightness, environmental stress cracking resistance, and strength of the drawn tubes.
数据说明拉伸后的快速冷却有利于管的尺寸稳定和直线度改善。
The results show that the cracking of pigtail tubes is brittle cracking caused by creep holes and terrible intergranular corrosion.
结果表明，猪尾管道开裂为沿晶脆性开裂，长期高温服役产生的蠕变孔洞及严重的晶间腐蚀共同导致了该管道的开裂。
The qualified welding procedure has successfully been used for the welding of the P91 steel furnace tubes in three ethylene cracking furnaces.
并依此制定工艺，成功地完成了该钢种在三台乙烯裂解炉中的焊接应用。
The wall-temperature fluctuation of water-wall tubes is one of the important causes for transverse-cracking failure of water-wall tubes.
锅炉水冷壁金属管壁温度的波动与水冷壁管横向裂纹失效有很大的关系。
The causes of corrosion cracking failure of the overhead condenser tubes after operated less than 6 months were analyzed. The content of halogen in the oil was the main reason of leakage.
某炼油厂的蒸馏装置塔顶冷凝器在使用不到六个月即出现腐蚀破坏，本文对失效的原因进行了分析，得出油气中的卤素是腐蚀破坏的主要原因。
The causes of corrosion cracking failure of the overhead condenser tubes after operated less than 6 months were analyzed. The content of halogen in the oil was the main reason of leakage.
某炼油厂的蒸馏装置塔顶冷凝器在使用不到六个月即出现腐蚀破坏，本文对失效的原因进行了分析，得出油气中的卤素是腐蚀破坏的主要原因。
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