Welding 410 SS
Welding 410 SS
(OP)
I'm looking for suggestions on making a successful weld in 410 material. I recently completed a test plate in 1" thick material which was welded using the SMAW process with a 400 F preheat, followed by a 600 F DHT and a 1400 F PWHT but unfortunately we had problems with very coarse grains resulting in mechanical issues.
It has been suggested that we change our PWHT procedure from a ramp up rate of 400F / hr, to increasing the temperature as quick as possible to 1000 F, hold at 1000 F for an hour and ramp up to 1400 F at 400 F/hr and cooling from a 1000 F to around 600 F fairly quickly. Any thoughts?
Thanks,
John
It has been suggested that we change our PWHT procedure from a ramp up rate of 400F / hr, to increasing the temperature as quick as possible to 1000 F, hold at 1000 F for an hour and ramp up to 1400 F at 400 F/hr and cooling from a 1000 F to around 600 F fairly quickly. Any thoughts?
Thanks,
John





RE: Welding 410 SS
RE: Welding 410 SS
RE: Welding 410 SS
= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection
http://www.trent-tube.com/contact/Tech_Assist.cfm
RE: Welding 410 SS
RE: Welding 410 SS
Impacts were run at -20 F.
RE: Welding 410 SS
RE: Welding 410 SS
RE: Welding 410 SS
RE: Welding 410 SS
I do not agree with lowering the preheat or interpass temperature or using an aggressive ramp rate to reach the proper PWHT temperature. The grain growth has more to do with prior cold work. Go back, and check the MTR and associated heat treatment of this plate.
RE: Welding 410 SS
The test plate material MTR indicates that it was annealed > or= 1400F for 35 min hr per inch of thickness and air cooled. C 14.4 BN 156 and a grain size of 9.
I've obtained new test plate material C .11, annealed at 1300 F min, grain size 6.
RE: Welding 410 SS
RE: Welding 410 SS
http
What location were the large grains your lab-tec was looking at - HAZ, weld, base? If base metal, your lab-tec and the MTR reporting a grain size of 9 are in conflict.
RE: Welding 410 SS
I believe the problem has more to do with the original heat treatment of this plate. Was the plate given a proper austenitization (1700-1800 deg F) and air cool heat treatment before tempering at 1400 deg F? I have seen where the plates are hot formed, and tempered without going thru an austenitizing heat treatment.
What I would do is to go back and have a quench and temper heat treatment performed to assure 100% formation of martensite. At this point, the plate can be tempered at 1300 deg F for 1 hour to assure adequate tempering.
I have qualified 410 ss with bends and tensile testing using the heat treatment mentioned above with no problems. Impacts are another story….
RE: Welding 410 SS
At you carbon level you should get finer grain size and resonable toughness, but don't expect much.
= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection
http://www.trent-tube.com/contact/Tech_Assist.cfm
RE: Welding 410 SS
What is the specification of your welding electrode?
RE: Welding 410 SS
RE: Welding 410 SS
RE: Welding 410 SS