347F20 Stainless Steels to NF A 49-214

347F20 - Specification & Application

  • NF A 49-214 - Steel tubes. Seamless austenitic steel tubes for use at high temperatures. Dimensions (with normal tolerances). Technical conditions of delivery
  • NF A 35-578 - Iron and steel. Stainless steel for high temperature application

Steel tubes. Seamless austenitic steel tubes for use at high temperatures. Dimensions (with normal tolerances). Technical conditions of delivery

Chemical composition(wt.%) of 347F20 grade: to NF A 49-214

Elements Min.(≥) Max.(≤) Similar Remarks
C 0.04 0.08
Si - 1.00
Mn - 2.00
P - 0.040
S - 0.030
Cr 17.00 19.00
Ni 11.00 13.00
Mo - -
B 0.0015 0.0060
Nb+Ta 8×C 1.00

347F20 - Detail

Steel tubes. Seamless austenitic steel tubes for use at high temperatures. Dimensions (with normal tolerances). Technical conditions of delivery

Mechanical properties of grade 347F20 NF A 49-214

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)
177 (≥) 335 (≥) 34 12 33 Solution and Aging, Annealing, Ausaging, Q+T,etc 442

Physical properties of grade 347F20 NF A 49-214

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
422 (≥) 836 (≥) 23 33 33 Solution and Aging, Annealing, Ausaging, Q+T,etc 122
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
429 446 879

Equivalent Products

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