8.3.4.4
(1) Thermal processing. The hot workability of the alloy is similar to that of the aforementioned Ni-Cr-Mo alloy and can be performed by referring to the process of these alloys.
(2) Cold working. The cold workability of the alloy is essentially the same as that of the Hastelloy C-276 alloy, and cold and cold forming do not encounter special difficulties.
(3) Heat treatment. The solution treatment process of Hastelloy C-22 alloy is: 1120 ° C: heat preservation followed by rapid cooling.
(4) Welding. The 00Cr22Ni60Mol3W3 alloy has good welding performance and can perform the process of the former Ni-Cr-Mo alloy. For the filling metal, a welding material of the same composition as the base material should be used.
8.3.4.5 Physical properties The physical properties of the alloy are shown in Table 8-54.
Table 8 – Physical Properties of S4 Hastelloy C-22 (00Cr22Ni60Mo13W3) Alloy
|
density/g • cm |
Melting point |
Specific heat capacity/J – (kg-K)-‘ |
Thermal conductivity/W • (m • K) |
|||||
|
521 |
100^ |
200^ |
48«C |
loot |
200$ |
300^ |
||
|
8.69 |
1359 -1399 |
414 |
423 |
444 |
10. 1 |
11.1 |
13.4 |
15.5 |
8.3.4.6 Application
The Hastelloy C-22 (00Cr22Ni60Mol3W3) alloy is a modified alloy based on the Hastelloy C-276 (00Crl6Ni60Mol6W3) alloy. It is mainly used in environments such as seawater, acetic acid, vinegar, hydrogen chloride, hydrogen fluoride, wet-process phosphoric acid, and pickling solutions using mixed acids. It is used to make containers, pipes, pumps, valves, plate heat exchangers, 502 cooling towers, and the like. Solve the problems of uniform corrosion, pitting corrosion, crevice corrosion, etc., which are difficult to solve, and contain a large amount of chloride ions and oxygen.