X25CrMnNiN25-9-7 1.4872 BS-EN-10095-1999
Austenitic heat-resisting steels
Steel designation
Name：X25CrMnNiN25-9-7
Number：1.4872
X25CrMnNiN25-9-7 1.4872 Chemical composition
C：0.20～0.30
Si: max.1.00
Mn:8.00～10.00
P(max):0.045
S(max):0.015
Cr:24.00～26.00
Ni:6.00～8.00
N:0.20～0.40
X25CrMnNiN25-9-7 1.4872 Mechanical properties at room temperature
Form: rods and sections
Thickness a or diameter(d:mm): a ≤25
HB max.:311
Proof strength: Rp0,2N/mm² (min):500
Rp1,0N/mm²(min):540
Tensile strength （Rm N/mm²）:850～1050
A % min
Long product:25
Flat products:（1）0,5≤a<3：（1，tr）：— （2）3 < a （1|tr）: —
Heat treatment
Symbol: +AT (A T=solution annealed)
Temperature(℃):1050～1150
Type of cooling: water, air, cooling sufficiently rapid
Maximum application temperature Ta for air
Ta max(℃):1150
(The loss of metal caused by scaling does not exceed 1 g/m2⋅h at Ta, and does not exceed 2 g/m2 at Ta + 50 ℃ on average for a period of 120 h with four intermediate coolings.)
Creep properties
Estimated average value of the strength for 1 % elongation at elevated temperature (Strength in N/mm2)
Elongation 1 % in 1 000 h:
700℃:55
800℃:15
900℃:4
Elongation 1 % in 10 000 h:
700℃:34
800℃:8
900℃:2
Estimated average value of the strength for rupture at elevated temperature
(Strength in N/mm2)
Rupture in 1 000 h:
700℃:80
800℃:26
900℃:11
Rupture in 10 000 h:
700℃:45
800℃:12
900℃:5
Physical properties for the steels and nickel alloys
Density(kg/dm2):7.8
Linear expansion coefficient (10⁻⁶K⁻¹): between 20℃ and
200℃:16.5
400℃:18.0
600℃:18.5
800℃:19.0
1000℃:19.5
Thermal conductivity
W/(m.K)
at 20℃: 14.5
at 500℃：20
Specific heat capacity
kJ(kg.k)
at 20℃：0.50
Electrical resistivity
Ω.mm²/m
at 20℃：0.75
Magnetizability：no (slightly magnetic when cold worked)