ER410 wire, then chromium content dilutes to 8 to 9 instead of 11.5 to 13.5
U hve not mentioned about no. of layers u hve welded.
ER 410 with a single layer welding will have around 9 Cr as mentioned by you.
The same wire will provide req. 13 Cr. with a 3 layer deposit. or 11.5 Cr with 2 layer deposit.
Pl. check on a mock up and if required machine out extra metal on base to maintain the chemistry,
U can deposit one buffer layer with ER 308, reduce the dilution and achieve 12 to 13 Cr with
single final layer also.
C Sridhar.
From: Vadivel Mahadevan <vadivelmahadev@gmail.com>
To: materials-welding@googlegroups.com
Sent: Monday, 2 June 2014 12:45 PM
Subject: [MW:20950] SS410 overlay with lower hardness
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
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
No comments:
Post a Comment