Technical Information:
Physical Properties

Hot Forming Temperature, Thermal Conductivity, Specific Heat Capacity and Thermal Expansion

Material

Hot Forming Temperature

Thermal Conductivity W/(m.K)

Specific Heat Capacity J/Kg. K

Mean coefficient of Thermal Expansion *
10 exp(-6).K(-1)

214N (349S52)

1150-950 °C

14.5

500

100 °C 15.5
300 °C 17.5
500 °C 18.5
700 °C 18.8

1.4882

1150-950 °C

14.5

500

100 °C 15.5
300 °C 17.5
500 °C 18.5
700 °C 18.8

EN24 - (817M40)

 

37.7

460

 

EN52 - (401S45)

1100- 900 °C

21

500

100 °C 10.9
300 °C 11.2
500 °C 11.5
700 °C 11.8

EN59 - (443S45)

 

 

 

Nimonic (80A)

1150-1050 °C

13

460

100 °C 11.9
300 °C 13.1
500 °C 13.7
700 °C 14.5

Specific Heat is the ratio of heat required to raise the temperature of a certain weight of material by 1 Deg C to that required to raise the temperature of the same weight of water by 1 Deg C

* Note - To find the expansion at 300 Deg C of a valve with a stem diameter of 0.275" in 214N material (Assuming the stem diameter was measured at 20 Deg. C) the temperature difference is (300 Deg C - 20 Deg C) = 280 Deg C stem diameter x temperature difference x coefficient of thermal expansion = Expansion of Valve ie:0.275 x 280 x 0.0000175 = 0.0013"

High Temperature Hardness (Cobalt Based Deposit No.6 & No.12)

Hardness

Material's (Valve Steels & Tips)

Rockwell 'C' Scale

Vicker€™s '30'

214N - (349S52)

30 HRc

318 Vickers

1.4882

30 HRc

385 Vickers

EN52 (401S45)

25 - 31 HRc

437 - 395 Vickers

EN59 (443S65)

28 - 36 HRc

283 - 353.5 Vickers

EN24 (817M40)

22 - 30 HRc

248 - 302 Vickers

Nimonic (80A)

32 HRc

Vickers

Armored Seats – Cobalt based deposit – Grade 6

38 - 42 HRc

371 - 412.5 Vickers

Tips – Cobalt based deposit – Grade 12

46 - 50 HRc

Vickers

EN24 (welded tips)

52 - 54 HRc

541 - 576 Vickers

1.3343 (welded tips)

Approx. 58 HRc

Vickers

Volumetric Weights

Material +/- 0.5 Grams

Volumetric Weight

214N - (349S52)

7.74 g/cc x (16.38706 x Volume)

1.4882

7.81 g/cc x (16.38706 x Volume)

Nimonic (80A)

8.19 g/cc x (16.38706 x Volume)

EN59 (443S65)

7.74 g/cc x (16.38706 x Volume)

EN52 (401S45)

7.61 g/cc x (16.38706 x Volume)

EN24 (817M40)

7.84 g/cc x (16.38706 x Volume)