Commercially Pure Titanium Grade 4

General Characteristics of CP Titanium Grade 4

CP titanium Grade 4 provides corrosion resistance, strength and fatigue characteristics that compare favorably to those of nickel and steel alloys. The strongest grade of unalloyed grades 1, 2, 3 and 4, this is a commercially pure, moderately formable alloy with good ductility.

Chemical Composition of CP Titanium Grade 4

  • Carbon 0.080 max
  • Nitrogen 0.050 max
  • Oxygen 0.40 max
  • Iron 0.50 max
  • Hydrogen 0.015 max
  • Other, 0.3 max per AMS 4921 G or 0.40 max per ASTM B 348-99
  • Titanium balance

Heat Treatment of CP Titanium Grade 4

  • Anneal
    • Holding at 1103° to 1301F (595° to 705°C) for two hours
    • Air cool
    • Stress relive by holding at 1004° to 1103°F (540° to 595°C)for 15 to 30 minutes
    • Air cool
  • Intermediate and final annealing in inert gas or vacuum
  • Perform final heat treatments in vacuum

Applications of CP Titanium Grade 4

  • Marine and saltwater applications
  • Chemical industry

Machinability of CP Titanium Grade 4

  • Comparable to austenitic stainless steel
  • Low speed, heavy feed rate and abundant cutting fluid
  • Rigid setups
  • Sharp tools
  • Employ safety measures because titanium chips are extremely combustible

Workability of CP Titanium Grade 4

  • Hot roll, forge, spin form, hot press and hydroform
  • Initial roughing at 86° to 122°F (30° to 50°C) higher than beta transus
  • Typically finish from 1499° to 1652°F (815° to 900°C)
  • Bend, stretch, head, stamp and draw at room temperature
  • Fix springback variance by hot sizing

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