AISI 1070

General Characteristics of AISI 1070

AISI 1070 provides exceptional strength while resisting wear, making it ideal for the railway industry. A high-carbon steel that can be oil or water hardened, AISI 1070 also performs well in hand and machine tool applications.

Chemical Composition of AISI 1070

  • Carbon 0.65-0.75
  • Manganese 0.60-0.90
  • Phosphorus 0.040 max
  • Sulfur 0.050 max
  • Silicon 0.15 to 0.30, or:
  • 0.10 max
  • 0.10-0.20
  • 0.20-0.40
  • 0.30-0.60

Heat Treatment of AISI 1070

  • Normalize by heating to 1550° to 1650°F (843° to 899°C) before air cooling
  • Anneal by heating to 1550° to 1575°F (843° to 857°C) before air cooling
  • Harden by heating to 1450° to 1525°F (788° to 829°C) before water or oil quenching
  • Temper to appropriate strength and hardness, from 400° to 1300°F (204° to 704°C)
  • May be austempered and martempered

Applications of AISI 1070

    • Railroad industry
      • Railroad rails
      • Street railway rails
      • Electric railway wheels
    • Heavy machine parts
    • Wire
    • Hand tools
    • Machinery for agricultural use
    • Springs
    • Mower blades
    • Auto industry
      • Torsion and stabilizer bars

Machinability of AISI 1070

  • Cobalt high-speed steel or carbide-tip tools
  • Sulfurized or chlorinated cutting oils for high-speed steel cutters
  • No oil for carbide-tip tools
  • Grind high-speed steel turning tools
    • 8-12° side rake
    • 6-10° back  rake
    • 7-9° side and end relief
    • 12-16° side cutting-edge angle
    • 8-14° end cutting-edge angle
    • Nose radius 10% of cut depth
  • Grind carbide-tip tools
    • 6-12° side rake
    • 2-8° back rake
    • 6-10° side and end relief
    • 8-12° end cutting-edge angle
    • 8-16° side cutting-edge angel
    • 1/32” nose radius

Workability of AISI 1070

  • Forge and hot roll form 1800° to 2225°F (982° to 1218°C)
  • 1650°F (899°C) minimum for hot working
  • Still-air cool
  • Easily cold drawn when annealed

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