PROPRIETARY CPM Rex M4 Tool steels

Material group: Ferrous Alloys / Tool steels
Country / Standard: PROPRIETARY

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Latest Update: 2014-04
Total number of updates: 1
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This material has 33 properties — only a subset is shown here.

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PROPRIETARY CPM Rex M4 Chemical Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
C
VALUE
≤ 1.4000
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
≤ 4.2000
UNIT
%
CAS NUMBER
7440-47-3
CRITERIA
Mo
VALUE
≤ 5.2000
UNIT
%
CAS NUMBER
7439-98-7
CRITERIA
V
VALUE
val1
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UNIT
%
CAS NUMBER
7440-62-2
CRITERIA
W
VALUE
val1
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UNIT
%
CAS NUMBER
7440-33-7

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PROPRIETARY CPM Rex M4 Physical Properties

Temperature

PROPERTY / VALUE
Modulus of Elasticity
190 — 214 GPa
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Density
7.72 — 8 kg/dm³
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Poisson Coefficient
val1
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This material has 33 properties — only a subset is shown here.

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PROPRIETARY CPM Rex M4 Heat Treatments

  • SOFT ANNEALING it is heated uniformly to a temperature of 860 - 870 °C; maintain at this temperature for 2 hours and allow to cool to 550 °C in the furnace at a cooling rate of 10 °C per hour. This is followed by cooling in still air. The strength values achieved by soft annealing are HB 230 – 260. STRESS RELIEVING Stress relieving follows rough machining by heating to a temperature of 600 – 700 °C. Once complete heat penetration has been reached, the material is allowed to cool in the furnace to approx. 500 °C followed by cooling in air. HARDENING usually involves the use of 2 preheating stages (450 – 500 °C/ 850 – 900 °C). The material is then rapidly heated from the preheating temperature to the austenitizing temperature of 1090 – 1180 °C. The upper range of the austenitizing temperatures (1140 – 1180 °C) should be used for metalcutting tools. The lower range of the austenitizing temperatures (1070 – 1120 °C) should be selected for cold working tools, for which a greater degree of toughness is required. Quenching can take place in oil, air or pressurized gas. Hot bath quenching at approx. 550°C is recommended. This provides flaw-free surfaces and avoids the risk of abnormal deformation. Material diameters up to max. 20 mm can be quenched with compressed air or compressed gas (in vacuum furnace, depending on type of furnace). This quenching method is too slow for larger cross-sections and results in the hardness values being too low. Quenching in oil ensures the correct hardness level even for large cross-sections, however, there is a risk of excessive distortion. Quenching large-volume tools in the hot bath generally results in slightly lower hardness than oil quenching. Irrespective of which quenching method is used, in all cases, the tools should be quenched to a temperature below 40 °C. The material must be tempered immediately after hardening. Tempering should be carried out immediately after the material has cooled down to below 40 °C or when the tool can be held with two hands. Triple tempering with a holding time of 2 hours in each stage at the tempering temperature is necessary. It is important to ensure that the tools are cooled down to room temperature between the individual tempering stages. Temperatures below 560 °C should be avoided in order to ensure satisfactory tempering results.

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  • 1Cross References
  • 19Composition
  • -Mechanical Properties
  • 7Physical Properties
  • 1Heat Treatment
  • 1Metallography
  • -Machinability
  • -Stress-Strain
  • -Formability
  • -Fatigue
  • -Fracture
  • -Creep
  • -Joints
  • -Coatings
  • -Dimensions
  • -Tribology
  • -Corrosion
  • -Ageing
  • -Weatherability
  • -Irradiation
  • 4Total Suppliers