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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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