PROPRIETARY CRB-7 Stainless steels

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

Data updates

Latest Update: 2022-10
Total number of updates: 3
Update History
2016-03 2016-01

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PROPRIETARY CRB-7 Chemical Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
C
VALUE
≤ 1.1000
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
≤ 14.0000
UNIT
%
CAS NUMBER
7440-47-3
CRITERIA
Mn
VALUE
≤ 0.4000
UNIT
%
CAS NUMBER
7439-96-5
CRITERIA
Mo
VALUE
val1
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UNIT
%
CAS NUMBER
7439-98-7
CRITERIA
Nb
VALUE
val1
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UNIT
%
CAS NUMBER
7440-03-1
CRITERIA
Si
VALUE
val1
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UNIT
%
CAS NUMBER
7440-21-3
CRITERIA
V
VALUE
val1
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UNIT
%
CAS NUMBER
7440-62-2

Carpenter Technology Corporation, Product Data Sheets,

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PROPRIETARY CRB-7 Physical Properties

Temperature

PROPERTY / VALUE
Modulus of Elasticity
190 — 215 GPa
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Density
7.61 — 8.1 kg/dm³
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Poisson Coefficient
0.27 — 0.3
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This material has 48 properties — only a subset is shown here.

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PROPRIETARY CRB-7 Heat Treatments

  • Annealing may be done by packing in a suitable container with clean cast iron borings or, preferably, in a controlled atmosphere furnace with a dew point of 35/45°F (1.7/7.2°C). Heat uniformly to 1600/1650°F (871/899°C) and cool slowly in the furnace, not faster than 20°F (11°C) per hour, to about 1100°F (593°C), and air cool to room temperature. This will produce an average hardness of Brinell 241. To relieve machining stresses for greater accuracy in hardening--first rough machine, then anneal below the critical, from 1250/1300°F (677/704°C), and cool slowly; then finish machine. Hardening: Heat treating is similar to high speed steels. Parts should be heat treated from neutral salt baths or properly adjusted controlled atmosphere furnaces. A dew point of +10°F (-12.2°C) is suggested for the high heat furnace when using a controlled atmosphere furnace. First preheat to 1475/1525°F (802/830°C), then transfer to a superheating furnace maintained at a temperature of 2085/2110°F (1140/1154°C). Small parts may be oil quenched to room temperature. However, it is preferable to harden the parts by quenching into molten salt at temperatures of 1000/1100°F (538/593°C), equalizing at this temperature, followed by air cooling to room temperature. The parts may then be given a stress-relief temper at 300°F (149°C) for one hour. For higher hardness and dimensional stability, sub-zero cool to -105°F (-76°C) or lower temperature. Allow the part to return to room temperature before tempering. Tempering: For maximum hardness and dimensional stability, double tempering is recommended. The effect of tempering temperature on the hardness of CRB-7 alloy is shown in the link titled "Effect of Tempering Temperature".

PROPRIETARY CRB-7 Mechanical Properties

Temperature

PROPERTY / VALUE
Tensile Strength
875 MPa
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Elongation, A
10.9 %
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Rockwell Hardness (HR)
val1
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Yield Strength, Rp0.2
751 MPa
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Reduction of Area
val1
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%
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  • -Cross References
  • 7Composition
  • 20Mechanical Properties
  • 17Physical Properties
  • 1Heat Treatment
  • -Metallography
  • -Machinability
  • 1Stress-Strain
  • -Formability
  • -Fatigue
  • -Fracture
  • -Creep
  • -Joints
  • -Coatings
  • -Dimensions
  • -Tribology
  • 1Corrosion
  • -Ageing
  • -Weatherability
  • -Irradiation
  • 1Total Suppliers