High corrosion resistant equipment for a plant
Provided is high corrosion resistant equipment for a plant having the lining structure which exhibits high reliability against breaking of a joining portion over a long use period. The high corrosion resistant equipment for a plant includes a lining plate and a support portion which are made of a high corrosion resistance material and a structural material portion made of a steel material or the like. The lining plate and the support portion include a joining portion to which friction stirring is applied. The support portion is assembled into or fastened to the structural material portion by means of the geometrical structure with a gap interposed between the support portion and the structural material portion. Due to such a constitution, high corrosion resistant equipment for a plant having the lining which exhibits high reliability can be acquired.
1. Corrosion resistant equipment for a plant which includes a lining plate and a support portion which are made of a corrosion resistant material and a structural material portion, wherein
the lining plate and the support portion are joined to each other by a joining portion formed by friction stirring, and the support portion is fastened to the structural material portion by the geometrical structure with a gap interposed between the support portion and the structural material portion; and
the lining plate is indirectly fixed to the structural material portion by the support portion.
2. The corrosion resistant equipment for a plant according to claim 1 , wherein the corrosion resistant material is one selected from a group consisting of zirconium, a zirconium alloy, titanium, a titanium alloy, stainless steel and a nickel alloy.
3. The corrosion resistant equipment for a plant according to claim 1 , wherein oxygen concentration and nitrogen concentration of the joining portion of the lining plate and the support portion are set to values equal to or less than upper limit values of oxygen concentration and nitrogen concentration which are specification values of a base material respectively, the joining portion has the equiaxed grain structure having an average grain size of 0.5 to 10 μm, and the difference in Vickers hardness between the joining portion and the base material is 0 HV or more and less than 100 HV.
4. The corrosion resistant equipment for a plant according to claim 1 , wherein a gap is set based on a change in size caused by thermal expansion in view of a temperature during an operation and the structure of the high corrosion resistant equipment for a plant.
5. The corrosion resistant equipment for a plant according to claim 1 , wherein the joining portion is formed such that the lining plate and the support portion are joined to each other by friction stirring or a welded metal portion which is welded in advance in a vacuum having an oxygen or nitrogen partial pressure of 100 Pa or less or in an inert gas atmosphere is subjected to friction stirring.
6. The corrosion resistant equipment for a plant according to claim 1 , wherein a hole formed in the structural material portion into which the support portion is assembled is formed such that a size of a depth portion is set larger than a size of an opening portion.
7. The corrosion resistant equipment for a plant according to claim 6 , wherein the support portion is inserted into the hole formed in the structural material portion, and the support portion is deformed due to applying of a pressure load including friction stirring to the support portion so as to prevent the support portion from being removed from the hole formed in the structural material portion thus fixing the support portion to the structural material portion.
8. The corrosion resistant equipment for a plant according to claim 1 , wherein the joining portion to which friction stirring is applied is formed by performing the friction stirring in a state where an inert gas is blown to the joining portion at a flow rate of 20 L/min or more.