Dear gentlemen,
I am in a valve industry , and as per API 600 Trim 1 Gate valves, SS410 overlay on sealing area should have a differential hardness of about 50 HRC.
In my company , we have Sub merged Arc Welding process for doing this overlay on carbon steel base (usually ASTM A216 Gr.WCB)
We have being trying a lot with various manufacturers of Wire and flux, but still couldnt achieve this.
The wire we use is AWS 5.9 ER 430 and flux is basic agglormorated.
We receive a hardness of about 38 - 40HRC. Our design has given hardness requirement for Gate as 25 to 30 HRC and for seat rings as 35 to 40 HRC to maintain differential hardness at any situation.
I am able to meet seat ring requirement, but not in the Gate.
If I use ER410 wire, then chromium content dilutes to 8 to 9 instead of 11.5 to 13.5
Tempering cannot be done as we dont have facility. Facility is at very far distance and it will add cost..
It is we grateful if I get a solution for this.
With regards
Vadivel .M
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