| 摘要 |
A pressure gauge for use with a corrosive fluid containing a sulfide which includes a Bourdon tube made from stainless steel type 316 and having a first or outer hardened layer and a second or inner layer having a hardness equal to or less than Rc22. The Bourdon tube is welded to a socket and to a closure member using stainless steel type 316 such that the weld seals the interface between the first and second layers to isolate the hardened outer layer from the corrosive fluid.
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