In fact the "AR" in AR400 steel stands for "Abrasian Resistant". The 400 of AR400 is a reference to the Brinell hardness of the steel. If you are looking to buy an excavator bucket, inquire what type of steel it is made of. Some buck...
In 1946 he bought Fisher Island, formerly the palatial estate of the William K. Vanderbilts, its harbor serving as the home of the Venturifor the next decade. Wood put another $600,000 in the ship fitting her with four 16-cylinder 1200 hp diesel engines capable of turning up 4800 hp. ...