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1045 Medium carbon steel. often used for bolts, studs and shaft parts. High strength and hardness. 1045 is medium-carbon steel. The higher carbon content imparts higher strength properties than 1018. When higher degrees of dimensional accuracy and straightness are required, we recommend the use of precusuib shafting.

Due to the higher carbon content this material is not readily welded. This material is used where greater strength is required than can be obtained from the lower carbon steel. It responds to heat treatment well. Used primarily as shafts, machinery parts, bolts, pinions, gears, etc.

This is a fully killed steel produced to fine grain practice by the electric arc or basic oxygen furnace process. Its relatively high strength coupled with reasonably good ductility make it a natural choice for miscellaneous parts such as shafts and gears.

Special welding procedures are required in welding this grade because its relatively high carbon and manganese content promote high hardness and brittleness in the heat affected zone. It is the most common shafting steel in the medium carbon range.

Principal Design Features
1045 is a medium carbon steel is used when greater strength and hardness is desired than in the "as rolled" condition. Extreme size accuracy, straightness and concentricity combine to minimize wear in high speed applications. Turned, ground and polished bars can be machined unsymmetrically with minimum distortion.



Applications
Used in gears, shafts, axles, bolts, studs, and machine parts.

Heat Treatment
Suitable for flame and induction hardening.

Forging
Can be hammer forged and responds to heat treatment.

Chemistry Data
Carbon 0.42 - 0.5
Iron Balance
Manganese 0.6 - 0.9
Phosphorus 0.04 max
Sulphur 0.05 max
Physical Data
Density (lb / cu. in.) 0.283
Mechanical Data
Form Round Bar
Condition Cold Drawn
Temper 68
Tensile Strength 91
Yield Strength 77
Elongation 12
Reduction of Area 35
Rockwell C15
Brinnell 179
Form Round Bar
Condition Hot Rolled
Temper 68
Tensile Strength 82
Yield Strength 45
Elongation 16
Reduction of Area 40
Rockwell C16
Brinnell 163


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