X8CrNiTi18-10 1.4878 BS-EN-10095-1999
Austenitic heat-resisting steels
Steel designation
Name：X8CrNiTi18-10
Number：1.4878
X8CrNiTi18-10 1.4878 Chemical composition
C：max.0.10
Si:max1.00
Mn(max):2.00
P(max):0.045
S(max):0.015
Cr:17～19
Ni:9.00～12.00
Ti:5×%C≤Ti≤0.80
X8CrNiTi18-10 1.4878 Mechanical properties at room temperature
Form: flat products
Thickness a or diameter(d:mm): a ≤75
HB max.:215
Proof strength: Rp0,2N/mm² (min):190;
Rp1,0N/mm²(min):230
Tensile strength （Rm N/mm²）:500～720
A % min:
Long product:40
Flat products:（1）0,5≤a<3：（1，tr）：25 （2）3 < a （1|tr）:40;
Heat treatment
Symbol: +AT (A T=solution annealed)
Temperature(℃):1020～1120
Type of cooling: water, air, cooling sufficiently rapid
Maximum application temperature Ta for air
Ta max(℃):850
(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:
600℃:110
700℃:45
800℃:15
Elongation 1 % in 10 000 h:
600℃:85
700℃:30
800℃:10
Estimated average value of the strength for rupture at elevated temperature
(Strength in N/mm2)
Rupture in 1 000 h:
600℃:200
700℃:88
800℃:30
Rupture in 10 000 h:
600℃:142
700℃:48
800℃:15
Rupture in 100 000 h:
600℃:65
700℃:22
800℃:10
Physical properties for the steels and nickel alloys
Density(kg/dm2):7.9
Linear expansion coefficient (10⁻⁶K⁻¹): between 20℃ and
200℃:17.0
400℃:18.0
600℃:18.5
800℃:19.0
1000℃:-
Thermal conductivity
W/(m.K)
at 20℃: 15
at 500℃：-
Specific heat capacity
kJ(kg.k)
at 20℃：0.50
Electrical resistivity
Ω.mm²/m
at 20℃：0.73
Magnetizability：no(slightly magnetic when cold worked)
Steel designation
Name：X8CrNiTi18-10
Number：1.4878
Chemical composition
C：max.0.10
Si:max1.00
Mn(max):2.00
P(max):0.045
S(max):0.015
Cr:17～19
Ni:9.00～12.00
Ti:5×%C≤Ti≤0.80
Mechanical properties at room temperature
Form: flat products
Thickness a or diameter(d:mm): a ≤75
HB max.:215
Proof strength: Rp0,2N/mm² (min):190;
Rp1,0N/mm²(min):230
Tensile strength （Rm N/mm²）:500～720
A % min:
Long product:40
Flat products:（1）0,5≤a<3：（1，tr）：25 （2）3 < a （1|tr）:40;
Heat treatment
Symbol: +AT (A T=solution annealed)
Temperature(℃):1020～1120
Type of cooling: water, air, cooling sufficiently rapid
Maximum application temperature Ta for air
Ta max(℃):850
(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:
600℃:110
700℃:45
800℃:15
Elongation 1 % in 10 000 h:
600℃:85
700℃:30
800℃:10
Estimated average value of the strength for rupture at elevated temperature
(Strength in N/mm2)
Rupture in 1 000 h:
600℃:200
700℃:88
800℃:30
Rupture in 10 000 h:
600℃:142
700℃:48
800℃:15
Rupture in 100 000 h:
600℃:65
700℃:22
800℃:10
Physical properties for the steels and nickel alloys
Density(kg/dm2):7.9
Linear expansion coefficient (10⁻⁶K⁻¹): between 20℃ and
200℃:17.0
400℃:18.0
600℃:18.5
800℃:19.0
1000℃:-
Thermal conductivity
W/(m.K)
at 20℃: 15
at 500℃：-
Specific heat capacity
kJ(kg.k)
at 20℃：0.50
Electrical resistivity
Ω.mm²/m
at 20℃：0.73
Magnetizability：no(slightly magnetic when cold worked)