X15CrNiSi25-4 1.4821 BS-EN-10095-1999
Austenitic-ferritic heat-resisting steel
Steel designation
Name：X15CrNiSi25-4
Number：1.4821
X15CrNiSi25-4 1.4821 Chemical composition
C：0.10～0.20
Si: 0.8～1.50
Mn(max):max.2.00
P(max):0.040
S(max):0.015
Cr:24.50～26.50
Ni:3.50～5.50
N:.max.0.11
X15CrNiSi25-4 1.4821 Mechanical properties at room temperature
Form: flat products
Thickness a or diameter(d:mm): a ≤12
Form: bars
Thickness a or diameter(d:mm): d ≤60
Form: rods
Thickness a or diameter(d:mm): d ≤25
HB max.:235
Proof strength: Rp0,2N/mm² (min):400
Tensile strength （Rm N/mm²）:600～850
A % min
Long product: 16
Flat products:（1）0,5≤a<3：（1，tr）：— （2）3≤ a 1：16 |tr: 12
Heat treatment
Symbol: +AT (A T=solution annealed)
Temperature(℃):1000～1100
Type of cooling: water, air, cooling sufficiently rapid
Maximum application temperature Ta for air
Ta max(℃):1100
Creep properties
Estimated average value of the strength for 1 % elongation at elevated temperature (Strength in N/mm2)
Elongation 1 % in 1 000 h:
500℃:80
600℃:27.5
700℃:8.5
800℃:3.7
900℃:1.8
Elongation 1 % in 10 000 h:
500℃:50
600℃:17.5
700℃:4.7
800℃:2.1
900℃:1.0
Estimated average value of the strength for rupture at elevated temperature
(Strength in N/mm2)
Rupture in 1 000 h:
500℃:160
600℃:55
700℃:17
800℃:7.5
900℃:3.6
Rupture in 10 000 h:
500℃:100
600℃:35
700℃:9.5
800℃:4.3
900℃:1.9
Physical properties for the steels and nickel alloys
Density(kg/dm2):7.7
Linear expansion coefficient (10⁻⁶K⁻¹): between 20℃ and
200℃:13.0
400℃:13.5
600℃:14.0
800℃:14.5
1000℃:15.0
Thermal conductivity
W/(m.K)
at 20℃: 17
at 500℃：23
Specific heat capacity
kJ(kg.k)
at 20℃：0.50
Electrical resistivity
Ω.mm²/m
at 20℃：0.90
Magnetizability：yes