NMX B-197 Grade 7 Structural and constructional steels

Material group: Ferrous Alloys / Structural and constructional steels
Country / Standard: Mexico / NMX

Data updates

Latest Update: 2015-02
Total number of updates: 1
Update History

This material has 21 properties — only a subset is shown here.

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NMX B-197 Grade 7 Chemical Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
C
VALUE
≤ 0.19
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
2.03 – 2.57
UNIT
%
CAS NUMBER
7440-47-3
CRITERIA
Mn
VALUE
≤ 0.90
UNIT
%
CAS NUMBER
7439-96-5
CRITERIA
P
VALUE
val1
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UNIT
%
CAS NUMBER
7723-14-0
CRITERIA
S
VALUE
val1
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UNIT
%
CAS NUMBER
7704-34-9
CRITERIA
Si
VALUE
val1
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UNIT
%
CAS NUMBER
7440-21-3

NMX-B-197: 1985 / Seamless and welded carbon and alloy steel tubes for low-temperature service

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NMX B-197 Grade 7 Physical Properties


Temperature

PROPERTY / VALUE
Modulus of Elasticity
190 — 210 GPa
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Density
7.67 — 7.86 kg/dm³
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Poisson Coefficient
0.27 — 0.3
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This material has 21 properties — only a subset is shown here.

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NMX B-197 Grade 7 Heat Treatments


  • Normalize by heating to a uniform temperature of not less than 845°C and cool in air or in the cooling chamber of an atmosphere controlled furnace. For the seamless process only, reheat and control hot working and the temperature of the hot-finishing operation to a finishing temperature range from 845 to 955°C and cool in a controlled atmosphere furnace from an initial temperature of not less than 845°C.

NMX B-197 Grade 7 Mechanical Properties


Temperature

PROPERTY / VALUE
Tensile Strength
448 MPa
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Brinell Hardness (HB)
≤ 190
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Elongation, A
≥ 30 %
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Rockwell Hardness (HR)
val1
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Yield Strength, Rp0.2
val1
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MPa
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  • -Cross References

  • 6Composition
  • 11Mechanical Properties
  • 3Physical Properties
  • 1Heat Treatment
  • -Metallography
  • -Machinability

  • -Stress-Strain
  • -Formability
  • -Fatigue
  • -Fracture
  • -Creep

  • -Joints
  • -Coatings
  • -Dimensions
  • -Tribology

  • -Corrosion
  • -Ageing
  • -Weatherability
  • -Irradiation

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