Heat treatment issues of INCONEL composite plate large-scale reactors
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This post was last edited by smxkjt on 2012-7-10 09:18. For a large reactor (DN8000) with a main body material thickness of 50+5 (Q345R+INCONEL), how should heat treatment be carried out? What needs to be noted?
It is best to carry out overall heat treatment in a heat treatment furnace at a temperature of 620°C for 2 hours.
Overall heat treatment can be carried out inside the furnace. It is necessary to control the sulfur content of the fuel used in heat treatment to prevent sulfur embrittlement.
A bit more information on sulfur embrittlement: Nickel and nickel alloys possess excellent corrosion resistance, but they are prone to corrosion and embrittlement in high-temperature sulfur-containing gases, leading to sulfur embrittlement. Through metallographic and energy spectrum analysis, it was confirmed that nickel materials should be used in the annealed state. When heating nickel-based pressure vessels and heads (for hot forming or heat treatment), the heating temperature and the atmosphere in the heating furnace must be strictly controlled to prevent sulfur embrittlement. http://www.doc88.com/p-004904431728.htm Experimental study on sulfur embrittlement in nickel materials during heating l
Posts on this forum regarding sulfur embrittlement: http://bbs.hcbbs.com/forum.php?mod=viewthread&tid=969074 – Nickel-clad pressure vessels as per specification 4.9.4.5