1. Material: The cutting edges shall be alloy steels meeting the approval of the Department. The steels shall be melted by the electric-furnace, basic-oxygen or other similar commercially accepted steel making process, and may be either ingot cast or strand cast. The manufacturer shall have the option to fabricate and machine the blades in the as-rolled or annealed condition, and then subsequently quench and temper the steel to meet the requirements of this specification. 2. Chemical Composition: The cutting edges shall be made of one or more of the following approved alloy steels, listed in numerical order. Their respective chemical compositions shall conform to the following requirements*: Alloy Name %C %Mn %P %S %Si %Cr %Ni %Mo SAE 1330D 0.28- 0.33 1.60- 1.90 0.035 max 0.040 max 0.15- 0.35 A B C SAE 15B30 modifiedE 0.28- 0.34 1.00- 1.30 0.025 max 0.050 max 0.15- 0.30 0.35- 0.55 0.40 max 0.15 max SAE 4130 0.28- 0.33 0.40- 0.60 0.035 max 0.040 max 0.15- 0.35 0.80- 1.10 B 0.15- 0.25 SAE 8620 0.18- 0.23 0.70- 0.90 0.035 max 0.040 max 0.15- 0.35 0.40- 0.60 0.40- 0.70 0.15- 0.25 T-1 Type A (ASTM A514 Grade B) 0.12- 0.21 0.70- 1.00 0.035 max 0.035 max 0.20- 0.35 0.40- 0.65 B 0.15- 0.25
