X25CrMnNiN25-9-7 1.4872 BS-EN-10095-1999

X25CrMnNiN25-9-7 1.4872 BS-EN-10095-1999

Austenitic heat-resisting steels

Steel designation

NameX25CrMnNiN25-9-7

Number1.4872

X25CrMnNiN25-9-7 1.4872 Chemical composition

C0.20~0.30

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)

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