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Study on Weldability of Operational TP304H Steel Pipe

Author: HuQun
Tutor: WangXiaoJun
School: Lanzhou University of Technology
Course: Materials Processing Engineering
Keywords: TP304H weldability backing weld flux-cored wire
CLC: TQ221.211
Type: Master's thesis
Year: 2012
Downloads: 47
Quote: 0
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Abstract


With the ethylene cracker units being large-scale and high efficient, its operatingparameters are harsher which results in high probability of damages and productionaccidents. In order to reduce the waste of material and the maintenance costs, the usedconvection finned pipes with good mechanical properties and corrosion resistancewhich have not reached their design life can be reused to replace the broken parts ofother pipes.In this paper, TP304H austenite stainless steel pipes which have been used for30,000hours and20,000hours are studied through chemical composition analysis,metallographic microscopy and BSE. The results show that though these pipes havebecome brittle because M23C6collects in the grain-boundary area, they are stillweldable.According to the characteristics of austenitic stainless steel, TIG welding processis used for backing weld and SMAW is used for covering weld. The backing weld isvery important for weld joint, so flux-cored arc welding is widely used because of itshigh welding speed and portability which can remove the process of filling pipe withargon gas. The TIG welding parameters for TGFA308L, TGF308L and TGS308wereformulated. In order to avoid the welding defects and improve the first qualified rate,optimize the welding parameters by observing the quality of weld.The impact toughness experiments and the tensile strength experiments of theweld joints were carried out. The results show that plasticity and toughness of the weldjoints welded by TGFA308L are better than the joints welded by old process.Moreover, the intergranular corrosion test and oxidation resistance test also prove thatthese fixed pipes can service again.

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CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of aliphatic compounds ( acyclic compounds) > Aliphatic hydrocarbons > Unsaturated lipid hydrocarbon > Monoolefins > Ethylene
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