ISO H21 Stainless Steels to ISO 6207 (1992)

ISO H21 - Specification & Application

  • ISO 6207 (1992) - Seamless nickel and nickel alloy tube
  • ISO 6208 (1992) - Nickel and nickel alloy plate, sheet and strip
  • ISO 9722 (1992) - Nickel and nickel alloys - Composition and forms of wrought products
  • ISO 9723 (1992) - Nickel and nickel alloy bars
  • ISO 9724 (1992) - Nickel and nickel alloy wire and drawing stock
  • ISO 9725 (1992) - Nickel and nickel alloy forgings

Nickel and nickel alloy forgings

Chemical composition(wt.%) of ISO H21 grade: to ISO 6207 (1992)

Elements Min.(≥) Max.(≤) Similar Remarks
C 0.08 0.15
Si - 1.00
Mn - 1.00
P - -
S - 0.020
Cr 18.00 21.00
Ni remaining -
Co - 5.00
Fe - 5.00
Ti 0.20 0.60
Cu - 0.50

ISO H21 - Detail

Nickel and nickel alloy forgings

Mechanical properties of grade ISO H21 ISO 6207 (1992)

Proof strength
Rp0.2 (MPa)
Tensile strength
Rm (MPa)
Impact energy
KV (J)
Elongation at fracture
A (%)
Reduction in cross section on fracture
Z (%)
As-Heat-Treated Condition Brinell hardness (HBW)
991 (≥) 861 (≥) 31 34 42 Solution and Aging, Annealing, Ausaging, Q+T,etc 344

Physical properties of grade ISO H21 ISO 6207 (1992)

Property Density
kg/dm3
Temperature T
°C/F
Specific heat
J / kgK
Thermal conductivity
W/mK
Electric resistance
µΩ·cm
Modulus of elasticity
kN/mm2
Expansion rate
964 (≥) 325 (≥) 21 44 12 Solution and Aging, Annealing, Ausaging, Q+T,etc 344
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
373 176 621
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