Re: Proper steel type for plates?
Just got off the phone with Steel Fab and had quite the interesting conversation with Earl.
He said they have AR400 and T1 in stock with lots of remnants, 3/8", 1/2" and 3/4".
They don't stock the AR500.
Now here's what he said the difference is between T1 and AR400 & AR500.
Both are Abrasive and Impact Resistant Rated Steels.
T1 - Type B and A (B is more common) is normal weldable and maliable steel, more easy to form. It's rated at 321 BHN (brinnel hardness)
Type A - has a lower alloy content than Type B does, but is rated at 321 BHN still.
AR400 is rated at a minimum 360 BHN, medium carbon steel, tempered chromoly and boron treated. It is a little more brittle than T1 but is harder.
AR500 is rated at a minimum 500 BHN, everything else is the same as AR400.
He told me that a 12"x12"x3/4" piece of AR400 is about 30 lbs. and would run me about $60 cut up. Then I told him that the guys in the shop just tossed me some remnant pieces for free if they didn't have to cut them to specs and had something close to what I wanted. [img]images/icons/grin.gif[/img] He said sure, if you we could help you out if you didn't want too much and had some scraps. [img]images/icons/smile.gif[/img]
Truth is, the guys in the shop said they load it all up in a van and get rid of the stuff if they couldn't use it if it's small, they don't store it for a rainy day... Once a week the piles of remnants get pitched.
So, how much harder the AR400 is than the T1 in relation to bullet impacts I'm not sure. I will get some of each next time I'm in there to compare though. AR400 is going to be the better stuff by the numbers...
Hope that helps some. [img]images/icons/smile.gif[/img]