X15CrNiSi25-4 1.4821 BS-EN-10095-1999

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

C0.10~0.20

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

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