Hi, I have here a very interesting microstructure of a low alloy steel with 0.3 carbon in quenched and tempered condition. I dont have much information on the heat treatment temperatures. Usually I would expect to see a tempered martensitic microstructure but this one is kind of mixed with light...
Hello all,
I was wondering about ASTM standard that applies to rating and classifying inclusions in steel castings.
ASTM E45 does that apply only to wrought steels or cast steels as well?
Thanks
Hi,
I have a question on the Mn:C ratio in casting low alloy steels. Can anyone refer me to some literature on how much manganese is safe (for hardenability) or is really detrimental to any low alloy steel (Quenched and tempered) after certain levels say 1.35%? and what is the relation to Mn:C...
Hello,
I am sure many threads might have been posted already on weldability carbon equivalent calculations. I have looked in to them but can not find what I am after.
I am looking for specific info on when one particular equation can be used, such as what type of steel and composition limits...
Hello guys,
I have an interesting looking crack like feature with inclusions in a low alloy steel casting. Heat treatment: Normalized-->quenched and tempered in water.
Any thoughts on how, why and it's effects on the properties of the part...
Hello all,
I have a question on the PWHT after welding for 15B30 materials. History: water quenched and tempered at 400F then welded.
My question is what is the correct PWHT temperature, read somewhere it should be lower than the initial tempering temperature and it makes sense as otherwise...
If I have a fracture surface showing some pockets of intergranular cracking and dimple mode after the tempering process, is it possible the part has undergone temper embrittlement or is this related to hydrogen embrittlement (from the moisture absorbed possibly during flame cutting). Anyways is...
Hello all, I was wondering if there is a specific reason customers ask foundries for Ni (1-2%) in low alloy steel castings to improve weldability? We know Ni is good for low temperature toughness but not sure what is the effect on weldability.
I have a low alloy boron steel with carbon 0.15-0.21% and Cr-0.8%, Mn-1.2%, after quenching I get a hardness of 40-44 HRC.
I have two situations 1) temper at high temperatures (>750 F) to say 34-37 HRC to soften the martensite and to improve the toughness or
2) temper at lower temperatures...
