X8CrNiTi18-10 1.4878 BS-EN-10095-1999

X8CrNiTi18-10 1.4878 BS-EN-10095-1999

Austenitic heat-resisting steels

Steel designation

NameX8CrNiTi18-10

Number1.4878

X8CrNiTi18-10 1.4878 Chemical composition

Cmax.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

NameX8CrNiTi18-10

Number1.4878

Chemical composition

Cmax.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)

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