X12NiCrSi35-16 1.4864 BS-EN-10095-1999
Austenitic heat-resisting steels
Steel designation
Name：X12NiCrSi35-16
Number：1.4864
X12NiCrSi35-16 1.4864 Chemical composition
C：max.0.15
Si: 1.00～2.00
Mn(max):2.00
P(max):0.045
S(max):0.015
Cr:15.00～17.00
Ni:33.00～37.00
N:. max.0.11
X12NiCrSi35-16 1.4864 Mechanical properties at room temperature
Form: bars
Thickness a or diameter(d:mm): a ≤160
HB max.:223
Proof strength: Rp0,2N/mm² (min):230
Rp1,0N/mm²(min):270
Tensile strength （Rm N/mm²）:550～750
A % min
Long product:30
Flat products:（1）0,5≤a<3：（1，tr）：28 （2）3 < a （1|tr）: 30
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(℃):1100
(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℃:105
700℃:50
800℃:25
900℃:12
Elongation 1 % in 10 000 h:
600℃:80
700℃:35
800℃:15
900℃:5
Elongation 1 % in 100 000 h:
600℃:40
700℃:14
800℃:4
900℃:1.5
Estimated average value of the strength for rupture at elevated temperature
(Strength in N/mm2)
Rupture in 1 000 h:
600℃:180
700℃:75
800℃:35
900℃:15
Rupture in 10 000 h:
600℃:125
700℃:45
800℃:20
900℃:8
Rupture in 100 000 h:
600℃:75
700℃:25
800℃:7
900℃:3
1000℃：1.5
Physical properties for the steels and nickel alloys
Density(kg/dm2):8.0
Linear expansion coefficient (10⁻⁶K⁻¹): between 20℃ and
200℃:15.0
400℃:16.0
600℃:17.0
800℃:17.5
1000℃:18.5
Thermal conductivity
W/(m.K)
at 20℃: 12.5
at 500℃：17
Specific heat capacity
kJ(kg.k)
at 20℃：0.55
Electrical resistivity
Ω.mm²/m
at 20℃：1.0
Magnetizability：no (slightly magnetic when cold worked)