Dear MNK
Please refer following details for Gr91 TO Gr 91
On Tuesday, August 8, 2017 at 9:22:33 AM UTC+5:30, MNK wrote:
Preheating : 200 deg c
Interpass temp :300 deg C
Post heating : 350 deg c for 4 hrs
Weld metal cool to 100 deg c soaking period 1hrs for formation of martensitic structure
after this start the PWHT @ 760 /120 min minimum
cooling and heating rate : 80 deg c / hr
unloading at : RT
Hardness test - Acceptable limit 245 to 260
On Tuesday, August 8, 2017 at 9:22:33 AM UTC+5:30, MNK wrote:
HegdeThanks for your replytill now we have not carried out PWHT, please correct me if i am wrong,a) as per B16.34 for PWHT we have to follow ASME section viii Div-1,b) as per section viii for P# 15E ( table UCS-56) please correct me if following the info is wrongTEMP RANGE -730 TO 800 Degree CelciusSOAKING TEMP - 800 Degree Celcius (Ni-Mn is less than 1 %)HEATING RATE - NOT MORE THAN 222 cCOOLING RATE - NOT MORE THAN 280 cSOAKING PERIOD - 1 Hr / inch ( our job is 15 mm thick fillet weld)temperature variation during soaking is max 83 cc) what is the temperature variation max permitted during heating and cooling rate?regardsMNK
On Saturday, 5 August 2017 08:25:33 UTC+5:30, Prakash Hegde wrote:MNKPresume the weld is F91 to it self ( P= 15E to P15E) where you require to follow certain welding disciplinei.e. Preheat -> Welding continuously not below preheat temp->Post heat at about 300-320C (If asked by client spec)-> cool below 100C to convert to martensetic sructure -> later PWHT as per Code say 730-760C Then only you will get hardness between 190-260BHN which is generaly acceptable limit(If SMAW E9015 B9 is used with lower H control)RegardsHegde P.b.On Friday, 4 August 2017 5:37 PM, mmm <must...@gmail.com> wrote:
Seal weld joint between bonnet and body1)Weld deposit thickness is 8mm.2)design code- API-6023)Electrode - E9015-B914)base material for bonnet and valvebody- SA 182 Gr F915)hardness of the weld joint is 300 BHN.Dear expertsa)Please let me know what are method to reduce the Hardness of the weld joint?b) is this electrode is correct or not please specify if its wrongThank you.MNK-----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+unsub...@googlegroups.com. Visit this group at https://groups.google.com/group/materials-welding .For more options, visit https://groups.google.com/d/optout .
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