AISI 4150 CALCIUM TREATED HTSR a '50' Carbon Chromium-Molybdenum Alloy Steel with Improved Machinability
Typical Analysis
C Mn P S Si Ni Cr
.50 .85 .020 .06/.1 .30 .95 .20
  • A general purpose alloy machinery steel with improved machinability as a result of an aim sulfur content. The product may or may not include the injection of a minute quantity of calcium. The calcium treatment modifies the sulfide inclusions in the steel to a much more globular form. Calcium also combines with the aluminates to form softer inclusions. The net effect (sulfur and calcium) is improved machinability and longer tool life.
  • Bars are supplied in the heat treated and stress relieved condition to a hardness level of approximately HB300 and are suitable for many service applications where strength and toughness are required
Typical Applications
  • Shafts, gears, pinions, spindles, axles, bolting, etc
Typical Heat Treatment
  • Hardening - 860℃/1580℉. Water Quench
  • Tempering - 550℃1022℉. Air Cool
  • Stress Relieving - 450℃/842℉
Mechanical Properties
  • HTSR - Typical
  • Tensile Strength – 50,000 psi
  • Yield Strength – 23,000 psi
  • Elongation – 20%
  • Reduction of Area – 52%
  • Hardness – HB302/Rockwell 'C' 32

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