Roger, I have it for 1070 and 1080. I would guess that you can make a reasonably accurate extrapolation from these:
1070 AISI
Carbon 0.65 to 0.75
Manganese 0.60 to 0.90
Phosphorus 0.040 Max
Sulfur 0.050 Max
Shallow hardening, widely used in spring-tempered condition. Used extensively for hand tools such as hammers & woodcutting saws. As quenched hardness approximately 65 HRC
Forging max heat 2175 degrees F.
Do not forge below 1500 degrees F.
Normalizing - heat to 1625 F and cool in air.
Annealing - heat to 1525 F. Furnace cool to 1200 F at a rate not to exceed 50F per hour.
Hardening heat to1500 F and quench in water or brine. Small sections may be oil quenched for full hardness.
Austempering thin sections (typically springs) gives hardness of 46 to 52 HRC. Austenitize at 1500 F and quench in molten salt bath at 600 F for at least one hour. Let air cool no tempering required.
Martempering austenitize at 1555 F and martemper in oil at 345 F.
1080 AISI
Carbon 0.75 to 0.88
Manganese 0.60 to 0.90
Phosphorus 0.040 Max
Sulfur 0.050 Max
As manganese content increases, hardenability is greater. As carbon content increases the free carbides enhances abrasion resistance. As quenched hardness approximately 65 HRC
Forging max heat 2150 degrees F.
Do not forge below 1500 degrees F.
Normalizing - heat to 1600 F and cool in air.
Annealing - heat to 1500 F. Furnace cool to 1200 F at a rate not to exceed 50F per hour.
Hardening heat to1500 F and quench in water or brine. Small sections may be oil quenched for full hardness.
Austempering thin sections (as for 1060) gives hardness of 46 to 52 HRC. Austenitize at 1500 F and quench in molten salt bath at 600 F for at least one hour. Let air cool no tempering required.
