ASTMA372 Standard Specifiion for Carbon and Alloy Steel 65 Grade H Class 70 Grade J Class 55 Grade J Class 65 Grade J Class 70 Grade K Grade L Grade J Class 110 Grade M Class A Grade M Class B Type I Type II Type III Type IV Type V Grade 1 Class 55 Type V Grade 1 Class 65 Type V Grade 1 Class 70 Type V Grade 2 Class 55 Type V Grade 2