@DAVIDSTECKER @EdStainless
We were thinking for the same as per IS 276 which is similar to ASTM A128, but was confused for which grade is suitable to have maximum life, while not causing any cracks/breakage. Please suggest which grade as per ASTM A218 can be used for the above application...
We are currently using the following self developed low alloy steel chemical composition but it is not in any standards.
The main issue in our material is that it breaks and the hardness achieved is very less than expected (i.e. 200-250BHN), it is expected to be around 400 BHN as per the OEM...
Hello everyone,
I’m looking for guidance on the best chemical composition or material grade to use for casting tooth adaptors used in Heavy Earth Moving Machinery (HEMM) buckets. Our goal is to achieve optimal durability and toughness in harsh working conditions without breaking.
We are...
Thanks for the input @EdStainless @weldstan @MFAMET
As suggested by MFAMET, can you please let me know what do you mean by "severe" quenching? We are currently water quenching at around 1750F and getting hardness around 300BHN before tempering.
Thanks for the reply weldstan.Can you please tell me the heat treatment cycle for the same so that the required hardness is achieved. Also would the increase in carbon percentage would make the casting more prone to crack while heat treatment/running operation?
Greetings everyone,
We are currently experimenting on an alloy that has chemical composition as below:
C: 0.2-0.3, Si: 1.0-1.2, Mn: 1-1.3,P,S:0.035 MAX, Ni: 1.2-1.5, Cr- 0.9-1.1, Mo: 0.2-0.3
We need to achieve a hardness of minimum 400 BHN but we are having a hard time doing so and could only...
Ok. Thanks for your feedbacks.@EdStainless @MagBen We are planning using magnesium ingots and breaking it into small pieces for magnesium treatment and using Ferro Silicon Barium Inoculant while pouring the metal into the mould. Will it form the microstructure required? Or is there any other...
Dear all,
I wanted to ask whether is it necessary to do magnesium treatment in ASTM A439 type D2 if we are using the scrap of the exact scrap of ASTM A439 type D2? Also what effects will it cause if it is not treated with magnesium but it will be heat treated as per the standards. Wouldn't heat...
@bobjustbob
Thanks for your reply.
We add aluminium scrap pieces in ladle just before tapping for deoxidisation.
Yes sir, we use lance pipe to purge argon as long as the molten metal is poured into the ladle with an argon cylinder.
In our final chemistry : Nitrogen is 0.15%.
%c : 0.028
%Si...
@MagBen
Thanks for your reply.
We are tapping the liquid into the laddle at 15400C. And in heat treatment castings are quenched within 30 secs from the door opening of HT furnace.
Is there any carbides/intermetallic precipitates at interphase boundary? : Im not technically capable enough to...
@bobjustbob
WE USE BOTTON POURING LADDLE WESMAN MAKE. IT IS A USED LADDLE BUT IS CLEANED AFTER EVERY POURING.
THESE ARE CASTINGS OF FLANGE WITH THICKNESS OF 40 MM AND 50 MM. WE HEAT TREAT THE CASTINGS AS PER STANDARD: Heat to 2050°F [1120°C] minimum, hold for sufficient time to heat casting...
@EdStainless
Reply For #2 :
1. Are there any internal defects? Do the crack locations align with any features? Gates? : NO THERE ARE NO PIN HOLES, SAND FUSION ETC. NO THE CRACKS ARE GENERATED RANDOMLY NOT IN ANY SPECIFIC REGION SUCH AS NEAR GATES OR RUNNERS. (ASLO THE THICKNESS OF FLANGES ARE...
thread330-428846
Dear all,
We just started casting duplex stainless steel castings (ASTM BPVC II A SA-995).
We have a 500kgs medium frequency induction furnace.
CASE 1:
We casted a ring like casting (impeller casing wearing ring) in ASTM BPVC II A SA-995 Grade 4A and all the mechanical and...
