Ambient temperature physical properties of stainless steels to BS EN 10088-1

Introduction

The table shown is based on the reference data presented in BS EN 10088-1.

Only a sample of the information available is shown. This is intended to show the scope of information available through representative figures for the most commonly used stainless steel types.
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
.	.	20C	400C	.	.	.	.
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 ie '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'.

 

Related Articles

1.  Elevated temperature physical properties of stainless steels

 

 

Source: http://www.bssa.org.uk/