EN 10088-2 Chemical Composition Stainless Steel

EN 10088-2 was originally published in 1995. The second, current version, EN 10088-2:2005, has superseded EN 10088-2:1995, which was withdrawn by BSi on 20th June 2005. The tables shown here only have the 2005 composition ranges.

There have been 17 new grades added and one ferritic grade, 1.4605 and one precipitation hardening grade,1.4532 removed. The new grades are: special ferritic grades 1.4595 and 1.4589, standard martensitic grades 1.4024, 1.4419 and 1.4110, special martensitic grades 1.4422 and 1.4423, special austenitic stainless steel grades 1.4315, 1.4319, 1.4369, 1.4565, 1.4597,1.4652 and 1.4659, special duplex (austenitic-ferritic) grades 1.4424,1.4477,1.4655.

These have been added into the tables as they are in the standard, where their compositions best fit, rather than in strict numerical order.

The number of decimal places of elements including chromium, nickel and in some cases molybdenum have also been reduced. For example in the 1995 edition the chromium range for grade 1.4306 316L was shown as 18.00 to 20.00. The 2005 version has this as 18.0 to 20.0. On the other hand, the molybdenum range for grade 1.4401 316 has been left as 2.00 to 2.50, whereas for grade 1.4434 the range has been changed from 3.00 to 4.00. It is now 3.0 to 4.0.

Mill test certificates with certified items to the 2005 edition of the standard should only have the number of decimal places for each element as shown in the standard.

It is important to carefully check the standard in cases of dispute.

A separate, important change has been the chromium range of grades 1.4301 304 and 1.4311. In 1995 these were 17.00 to 19.50 but in 2005 the minimums have been raised and are now 17.5 to 19.5.

The permissible product analysis tolerances on values for cast analysis, shown in Table 5 of the standard are unchanged. For example, for a cast of 1.4301 grade, with a specified chromium range of 17.5 to 19.5, the tolerance on a product check sample is still + or - 0.20, not + or - 0.2 as might be expected. A single check sample on cast with a declared analysis of say, 18.1 must therefore be between 17.90 and 18.30.

Element	Specified Limits on Cast Analysis (%)		Permissible tolerance on product analysis (%)
Carbon		< 0.030	+0.005
	> 0.030	< 0.20	±0.01
	> 0.20	< 0.50	±0.02
	> 0.50	< 0.60	±0.03
Silicon		< 1.00	±0.05
Silicon	> 1.00	< 4.5	±0.10
Manganese		< 1.00	+0.03
	> 1.00	< 2.00	±0.04
	> 2.00	< 10.5	±0.10
Phosphorus		< 0.045	+0.005
Sulphur		< 0.015	+0.003
	> 0.015	< 0.030	±0.005
	> 0.15	< 0.35	±0.02
Nitrogen		< 0.11	±0.01
Nitrogen	> 0.11	< 0.50	±0.02
Chromium	> 10.5	< 15.0	±0.15
	> 15.0	< 20.0	±0.20
	> 20.0	< 30.0	±0.25
Copper		< 1.00	±0.07
Copper	> 1.00	< 5.0	±0.10
Molybdenum		<0.60	±0.03
	> 0.60	< 1.75	±0.05
	> 1.75	< 8.0	±0.10
Niobium		< 1.00	±0.05
Nickel		< 1.00	±0.03
	> 1.00	< 5.0	±0.07
	> 5.0	< 10.0	±0.10
	> 10.0	< 20.0	±0.15
	> 20.0	< 32.0	±0.20
Aluminium	> 0.10	< 0.30	±0.05
Aluminium	> 0.30	< 1.50	±0.10
Boron		< 0.0050	±0.0005
Titanium		< 0.80	±0.05
Tungsten		< 2.50	±0.05
Vanadium		< 0.20	±0.03