A 988 S21904 Stainless Steels to A 988/A 988M (2011)

A 988 S21904 - Specification & Application

  • A 988/A 988M (2011) - Hot Isostatically-Pressed Stainless Steel Flanges, Fittings, Valves, and Parts for High Temperature Service

Annealed or Cold-Worked Austenitic Stainless Steel Sheet, Strip, Plate, and Flat Bar

Chemical composition(wt.%) of A 988 S21904 grade: to A 988/A 988M (2011)

Elements Min.(≥) Max.(≤) Similar Remarks
C - 0.04
Si - 1.00
Mn 8.00 10.0
P - 0.06
S - 0.03
Cr 19.0 21.5
Ni 5.50 7.50
N 0.15 0.40

A 988 S21904 - Detail

A 988 S21904

Mechanical properties of grade A 988 S21904 A 988/A 988M (2011)

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)
268 (≥) 621 (≥) 14 31 14 Solution and Aging, Annealing, Ausaging, Q+T,etc 231

Physical properties of grade A 988 S21904 A 988/A 988M (2011)

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
854 (≥) 634 (≥) 11 13 12 Solution and Aging, Annealing, Ausaging, Q+T,etc 222
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
412 482 417

Equivalent Products

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