API Grade 50 Structural and constructional steels

Material group: Ferrous Alloys / Structural and constructional steels
Country / Standard: United States / API

Data updates

Latest Update: 2023-05
Total number of updates: 2
Update History
2019-02

This material has 200 properties — only a subset is shown here.

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API Grade 50 Chemical Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
Al
VALUE
0.02 – 0.06
UNIT
%
CAS NUMBER
7429-90-5
CRITERIA
C
VALUE
≤ 0.18
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
CEV
VALUE
≤ 0.43
UNIT
%
CAS NUMBER
CRITERIA
Mn
VALUE
val1
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UNIT
%
CAS NUMBER
7439-96-5
CRITERIA
N
VALUE
val1
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UNIT
%
CAS NUMBER
7727-37-9; 17778-88-0
CRITERIA
Nb
VALUE
val1
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UNIT
%
CAS NUMBER
7440-03-1
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
CRITERIA
Ti
VALUE
val1
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UNIT
%
CAS NUMBER
7440-32-6

API 2H: 2006 / Specification for carbon manganese steel plate for offshore structures

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API Grade 50 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 200 properties — only a subset is shown here.

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API Grade 50 Heat Treatments

  • If approved by the purchaser, plates t > 63.5 mm, may be quenched and tempered by heating to a temperature between 1500°F (815°C) and 1700°F (925°C) to produce an austenitic structure, holding a sufficient time to attain uniform heat throughout the material, quenching in suitable medium, and tempering at 1100°F-1300°F (595°C-705°C)
  • The plates shall be quenched and tempered by cooling to a temperature below 1000°F (538°C) after rolling, reheating to a temperature between 1500°F (815°C) and 1700°F (925°C) to produce an austenitic structure, holding a sufficient time to attain uniform temperature throughout the material, quenching in a suitable liquid medium and tempering at 1050°F-1300°F (565°C-705°C)

API Grade 50 Mechanical Properties

Temperature

PROPERTY / VALUE
Tensile Strength
448 — 620 MPa
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Brinell Hardness (HB)
131 — 207
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Elongation, A
≥ 21 %
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Yield Strength, Rp0.2
val1
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MPa
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  • -Cross References
  • 42Composition
  • 38Mechanical Properties
  • 3Physical Properties
  • 3Heat Treatment
  • -Metallography
  • -Machinability
  • -Stress-Strain
  • -Formability
  • -Fatigue
  • -Fracture
  • -Creep
  • 4Joints
  • -Coatings
  • 108Dimensions
  • -Tribology
  • -Corrosion
  • -Ageing
  • -Weatherability
  • -Irradiation
  • 2Total Suppliers