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ISO H21 Application:ISO standard heat-resisting alloy
Category Type Steel grade Standard Country
Grades Special Alloy ISO H21 ISO ISO

Chemical composition % of the ladle analysis of grade ISO H21

C(%) Si(%) Mn(%) P(%) S(%) Cr(%) Ni(%) Cu(%) Co(%) Ti(%) Other(%)
Max 0.08 Max 1.0 Max 1.0 Max 0.015 Max 0.02 18.0-21.0 Remaining Max 0.5 Max 5.0 0.20-0.60 Fe:Max 5.0
ISO standard heat-resisting alloy
Mechanical properties of grade ISO H21
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)
429 (≥) 643 (≥) 32 13 12 Solution and Aging, Annealing, Ausaging, Q+T,etc 231
Physical properties of grade ISO H21
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
988 (≥) 457 (≥) 12 12 22 Solution and Aging, Annealing, Ausaging, Q+T,etc 414
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
219 843 683
ISO H21 Range of products
Product type Products Dimension Processes Deliver Status
Plates / Sheets Plates / Sheets 0.08-200mm(T)*W*L Forging, hot rolling and cold rolling Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Steel Bar Round Bar, Flat Bar, Square Bar Φ8-1200mm*L Forging, hot rolling and cold rolling, Cast Black, Rough Turning, Shot Blasting,
Coil / Strip Steel Coil /Steel Strip 0.03-16.0x1200mm Cold-Rolled & Hot-Rolled Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Pipes / Tubes Seamless Pipes/Tubes, Welded Pipes/Tubes OD:6-219mm x WT:0.5-20.0mm Hot extrusion, Cold Drawn, Welded Annealed, Solution and Aging, Q+T, ACID-WASHED
Cross Reference Table(Equivalent Grade)
Grade Standard Country Application
GH2130 ISO ISO
Classification and designation for superalloys and high temperature intermetallic materials
GH2132 ISO ISO
Classification and designation for superalloys and high temperature intermetallic materials
GH2135 ISO ISO
Classification and designation for superalloys and high temperature intermetallic materials
GH2136 ISO ISO
Classification and designation for superalloys and high temperature intermetallic materials
03X21H21M4ΓБ ISO ISO
Russia GOCT standard stainless steel and heat resistant steel steel grade and chemical composition
SUH21 ISO ISO
CNS standard heat resistant steel plate of the steel grade and chemical composition
ISO H21 ISO ISO
Nickel and nickel alloy forgings
H21 ISO ISO
Hot-Work Tool Steel
H21 ISO ISO
Hot-Work Tool Steel

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