[Gonzalo Bravo]

Como info general:

General Purpose

1010 - General purpose steel. Good weldability and forming and extruding chrematistics. Often used for general structural and automotive bodies.

1015 - General purpose low carbon plate with predictable qualities. Has excellent welding and bending properties. Structural applications.

1020 - Good general purpose low carbon plate. Good machinability and formability. Used in automotive camshafts and similar applications.

1025 - Plate. Higher carbon plate for greater strength. Has optimal combination of strength, weldability and good form retaining after machining.

1045 Medium carbon steel. often used for bolts, studs and shaft parts. High strength and hardness.

Hot Rolled Carbon Steel

1018, 1020 (HR,CF) - Low carbon steel. Has good hardening properties, fair machinability. Readily brazed and welded.

1117 (HR,CF) - Low carbon, high manganese steel. Good machinability, case hardening is deep and uniform. Good for bending, broaching and most deforming without cracking.

Medium Carbon - Direct Hardening

1035 (HR) - Intermediate carbon higher in strength and hardness than low carbon steel. Used for studs, bolts etc.

1040, 1045 (HR,CF) - Used when greater strength and hardness is desired in the as rolled condition. Good for hammer forge processes. Uses include gears, shafts, axles, bolts sand studs.

1050 (CF) - Strain hardened, stress relieved material typically 100 KSI yield strength.

1141 (HR,CF) - Improved machinability and better heat treatment response (surface hardness is deeper and more uniform) than plain carbon steels. Uses include gears, shafts, axles, bolts, studs, pins, etc.

Screw Stock

1215 (HR,CF) - Fast cutting steel is considered the standard screw stock. Cutting speeds and machining characteristics are excellent.

Medium Carbon Alloy Bars - Annealed

4140/4150 - Widely used general purpose alloys, low in cost. A broad range of strength and toughness is attainable through variations in heat treatment. Used for forgings, tubing and fittings

4340 - Highly alloyed steel, nominally 1.8% Ni, .80% chromium and .25% molybdenum. High strength characteristics. Used for heavily stressed parts operating in fatigue and other duty conditions.