http://www.steelforge.com/infoservices/properties/step2.asp?Family=Carbon+Steels
If you go here and set the box at the upper right to mangalloy the site claims it will give you properties of this material. You will have to register (I didn't). It seems that this material is a member of the class AR400 if that is any help. http://www.fordsteel.com/mang_plates_bars.htm
This seems to be the manufacturer or perhaps distributor of this material. I doubt that you can work this stuff cold and it may have rather precise requirements for hot working if you want to retain its properties. The manufacturer will know, usually the maker will cooperate with you. There is some how to contact us stuff at that address.
Good luck
Bill
Thanks for the information. Now it is clear to me as to what is it. this steel is the same as Hadfield steel or austenitic manganese steel. I have worked on this steel once a couple of years back.
I can tell you some important rules for welding this steel :
1. the most popular welding electrode to weld this steel is 18Cr-8Ni-5Mn type stainless steel electrode. this may be available in various brand names, I remember citochromax-N from Oerlikon.
2. After casting, it is heat treated ( water quenched from 1050 deg.c) to reduce its hardness to 240 BHN. It picks up hardness during prolonged welding or impact by precipitation of manganese carbide. Thus the welding always needs to be done in the softened state. Do not weld if it is already work hardened.
3. Keep the interpass temperature as low as possible ( 120 deg. c. max) otherwise the hardess will increase. try to cool the job as fast as possible. do not allow heat to build up at one place. do intermittant welding to evenly distribute the heat. if the job is big, give the job some forced cooling to dissipate the heat on a continuous basis.
as the material is austenitic, there is no chance of cold cracks. But hot cracks can occure if the above not followed.
Make the first piece and then do penetrant test before continuing.