Ambient temperature physical properties of stainless steels to BS EN 10088-1
Introduction
A separate table indicates some of the grades that have been grouped together.
Physical properties table
| Steel Types (AISI) |
Density |
Modulus |
Expansion |
Conductivity |
Specific Heat |
Resistivity |
| . |
. |
20oC |
400oC |
. |
. |
. |
. |
| Ferritic stainless steels |
| 410S |
7700 |
220 |
195 |
10.5 |
30 |
460 |
0.60 |
| 430 |
7700 |
220 |
195 |
10.0 |
25 |
460 |
0.70 |
| 444 |
7700 |
220 |
195 |
10.4 |
23 |
430 |
0.8 |
| Martensitic and precipitation hardening stainless steels |
| 410 |
7700 |
215 |
190 |
10.5 |
30 |
460 |
0.60 |
| 440 |
7700 |
215 |
190 |
10.4 |
15 |
430 |
0.8 |
| 630 |
7800 |
200 |
170 |
10.9 |
16 |
500 |
0.71 |
| Austenitic stainless steels |
| 304 |
7900 |
200 |
172 |
16.0 |
15 |
500 |
0.73 |
| 316 |
8000 |
200 |
172 |
16.0 |
15 |
500 |
0.75 |
| ‘6%Mo’ |
8000 |
195 |
166 |
16.5 |
14 |
500 |
0.85 |
| Duplex stainless steels |
| ‘2205’ |
7800 |
200 |
N/A |
13.0 |
15 |
500 |
0.8 |
Some EN grades covered by the steel types
| AISI |
EN Grades Covered |
| 410S |
1.4000 |
| 430 |
1.4016 |
| 444 |
1.4521 |
| 410 |
1.4006, (410), 1.4005, (416), 1.4021, (420) |
| 440 |
1.4112, (440B), 1.4122, 1.4125, (440C) |
| 630 |
1.4542, (17/4 PH) |
| 304 |
1.4301, (304), 1.4305, (303), 1.4306, (304L), 1.4307, (304L), 1.4541, (321), 1.4550, (347) |
| 316 |
1.4401, (316), 1.4404, (316L) |
|
|
| ‘2205’ |
1.4462, (2205) |
| ‘6%Mo’ |
1.4547, (254SMO) |
Units for the physical properties
‘Density’
The units are kg/m3 and are assumed to be for ambient temperature only.
‘Modulus’
This is the ‘elastic’ or ‘Young’s’ modulus. Sometimes expressed as ‘E’. Values at ‘ambient’ 20°C and 400°C only are shown. The units are kN/mm2
BS EN 10088-1 has values in 100-degree steps up to 300, 400 or 500°C, depending on the steel ‘family’ involved.
‘Expansion’
The thermal expansion figures shown are an average between 20°C and 100°C only. BS EN 10088-1 has values shown as averages between 20 and 100, 200,300,400 and 500 °C, depending on the steel ‘family’ involved.
The units are ‘ 10-6 x K-1 ‘. This represents the increase, (or decrease), in length that a 1 metre length of material will expand, (or contract), if the temperature is changed by 1 degree Kelvin, (which can be taken as 1 degree Centigrade for practical purposes).
So a value of ’10’ indicates that a 1 metre length of steel expands by 0.000010 metres, (0.010mm), if the temperature rises from 20 to 21 °C.
‘Conductivity’
The thermal conductivity values are for 20°C only. The units are W/m.K.
This represents the amount of heat, in watts, that is conducted by the material, where there is a temperature difference of 1-degree Kelvin. (This represents a one-metre cube of material, with a 1-degree temperature difference on opposite faces)
‘Specific Heat’
This is shown in BS EN 10088-1 as ‘Specific thermal capacity’ at 20°C. The units are J/kg.K, i.e. ‘Joules per kilogram x degrees K’
‘Resistivity’
The units of ‘electrical resistivity’ are ‘ohm.mm2/m’ and are shown at 20°C, as shown in BS EN 10088-1. These units are the same as ‘micro-ohm.m’.
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