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thanks sir for ur reply.1% is acceptable from section thickness. and heat treatment done in gas fire contineouse furnace atmosphere is a big issue for reduce decarbourization. and second thing is we have tk soaking time in eace trey 25 min and wt is part 700gm is soaking more. is pc burn in...

Hi,to all of you, Plz suggest to me how to controlled decarb in hardening tempering process. how much decarb should be.

hi sir, please suggest to me for reduce decarburization. actually new development item i have hard n tempered. but in final micro observed fully decarb. its socket Wt. 800gm Spec hardness 201-255 BHN

thanks for reply....

in EN8D material can i achieved plzgive the suggestion

i agree with u but we can achieve 180 bhn sir with air cooling i think

hi, dear all one i want discuss about normalising process.i know its so simple process but i want to discuss with ... actually if we use 0.40%C and 0.72%Mn and grade C40,EN8 or EN8D raw material for any part and forge then normalise its raw material hardness max 179 BHN. can u suggest how to...

sir would u tell me how to check c % by chemical analysis. actually i have checked incoming raw material but result not come accurate and std result also not correct. thanks atibha

sir hardness required 180-220 BHN after tempering and observed after hardening max 255BHN

that means if we done with 400-450°C than not much more effect in structure and structure not fully tempered martensite.only stress relief in this temperature for better structure should i go above 500°C tempered.and material is 35C8 grade

Sir plz suggest me how to down ferrite % of hardening. can i increase soaking time than effect in ferrite % and oil temp. we can same kept 50°C .

hi frds and sirs... sorry to come very late.. how r all of u.. anyway sir i want one simple question if i will tempered part in temperature 450°C and 400°C than what effect on structure and other properties. and can i tempered my part at this temperature what should be range of tempering...

hi sir, plz tell me how to fix tempering temperature for diff part and different grade becoz tempering temperature depend on as quench hardness and as quench hardness depend upon carbon percent and other alloying element. so plz tell me how to fixed temperature of tempering.

can u tell me how to close this complain i m not under standing how to write in action plan and what we send to customer to close complain

hi.all of u.. i have get one customer comlain regarding crack observed during assembly of socket.he told to us its raw material crack . can u told me that how to identified crack by eyes that it is raw material crack ,heat treatment or forging. can u tell me how to look like all forging ,heat...

SKT 609 Specified hardness 241-295 BHN As Quench hardness – 514-601 BHN than lower hardness have range with in spec 241-295 BHN in temered. yes i hv done at 680 degree temperature to lower the hardness after tempering hardness come 255-269-285 BHN means there is no bad effect in micro structure...

rp ji quench hardness is too high that why tempering temperature going to higher side plz see i have written my privious mail and i want to just ask to u plz tell me can i do tempering at higher temperature and what effect in structure

As quench hardness we achived in EN 18D and SAE4140 is BHN than can u tell me for low hardness we will go higher side tempering temperature 680degree than hardness should low but structure will also affected ferrite % will increase or not . example:-SKT 609 Specified hardness 241-295 BHN...

sir plz tell me if i have set the temperature of furnace 860 degree and furnace temperature observed 860-861-862-863-864-865 degree . so plz tell me its ok or not . and how much degree temperature can varies.and how much permisible deviation should be

will u tell be if Skt 220 we will increase tempreature 880°C against 860°C and time 25min against 20 mins /tray soaking than pc will burn. and pc wt is 0.320kg loading 300 pc per tray.becoz specification is 175-220 BHN .material used EN8D C% 0.42,Mn%-0.86,Si%-0.25