1.6957 Tool Die Steels to SEW 555

1.6957 - Specification & Application

  • SEW 555 - Steels for larger forgings for components in turbine and generator installations

Steels for larger forgings for components in turbine and generator installations

Chemical composition(wt.%) of 1.6957 grade: to SEW 555

Elements Min.(≥) Max.(≤) Similar Remarks
C - 0.28
Si - 0.25
Mn - 0.40
P - 0.010
S - 0.010
Cr 1.40 1.80
Ni 3.40 3.80
Mo 0.30 0.45
V - 0.15
Al - 0.025

1.6957 - Detail

Steels for larger forgings for components in turbine and generator installations

Mechanical properties of grade 1.6957 SEW 555

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)
656 (≥) 816 (≥) 41 34 41 Solution and Aging, Annealing, Ausaging, Q+T,etc 314

Physical properties of grade 1.6957 SEW 555

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
253 (≥) 994 (≥) 21 34 31 Solution and Aging, Annealing, Ausaging, Q+T,etc 333
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
662 294 818

Equivalent Products

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