1.1 This specification covers carbon and low alloy steel castings having chemical analyses similar to that of the standard wrought grades. This specification covers carbon and low alloy steel castings having chemical analyses similar to that of the standard wrought grades. Several grades are covered, such as; SC 1020, SC 1025, SC 1030, SC 1040, SC 1045, SC 4130, SC 4140, SC 4330, SC 4340,