{"id":5991,"date":"2026-07-16T07:30:06","date_gmt":"2026-07-16T05:30:06","guid":{"rendered":"https:\/\/www.gns-nederland.nl\/?p=5991"},"modified":"2026-08-28T08:45:36","modified_gmt":"2026-08-28T06:45:36","slug":"corrosion-resistance-of-stainless-steel-acc-crc-classification","status":"publish","type":"post","link":"https:\/\/www.gns-nederland.nl\/en\/corrosion-resistance-of-stainless-steel-acc-crc-classification\/","title":{"rendered":"Corrosion Resistance of Stainless Steel acc CRC Classification"},"content":{"rendered":"

Corrosion Resistance Classification of Stainless Steels for Structural Applications<\/h3>\n

According to EN 1993-1-4<\/strong>, stainless steel grades are classified according to their corrosion resistance, depending on the environment in which they are to be used.\u00a0The environmental conditions are assessed using three Corrosion Resistance Factors (CRF)<\/strong>. Based on the resulting CRF value, stainless steel grades are assigned to a Corrosion Resistance Class (CRC)<\/strong> from I to V. The higher the class, the greater the corrosion resistance.<\/p>\n

The Corrosion Resistance Factor (CRF)<\/strong><\/span> is calculated as follows:<\/p>\n

CRF = F1 + F2 + F3<\/span><\/p>\n

F1<\/sub><\/span>\u00a0 \u00a0<\/span> \u00a0 \u00a0Risk of exposure to chlorides from salt water, seawater or de-icing salts.<\/p>\n

F<\/span>2\u00a0 \u00a0<\/span> \u00a0 \u00a0 <\/sub><\/span>Risk of exposure to sulphur dioxide.<\/p>\n

F<\/span>3\u00a0<\/span> \u00a0 \u00a0 \u00a0 <\/sub><\/span>Cleaning or washing by rain.<\/p>\n

___________________________________________________________________________________________________________<\/p>\n

F1<\/sub> \u2013 Risk of Exposure to Chlorides from Salt Water, Seawater or De-Icing Salts<\/strong><\/span><\/p>\n

M<\/strong> is the distance from the sea.<\/p>\n

S<\/strong> is the distance from roads where de-icing salts are used.<\/p>\n

F1<\/sub> categories<\/strong><\/p>\n

–<\/strong>1\u00a0<\/span>\u00a0 \u00a0 \u00a0 \u00a0 Internal, controlled environment<\/span><\/p>\n

–<\/span>0\u00a0<\/span>\u00a0 \u00a0 \u00a0 \u00a0 Low exposure risk: M > 10 km or S > 0.1 km<\/span><\/p>\n

-3<\/span>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0Medium exposure risk: 1 km < M \u2264 10 km or 0.01 km < S \u2264 0.1 km<\/span><\/p>\n

-7 <\/span>\u00a0 \u00a0 \u00a0 \u00a0 High exposure risk: 0.25 km < M \u2264 1 km or S \u2264 0.01 km<\/span><\/p>\n

-10 <\/span>\u00a0 \u00a0 \u00a0 Very high exposure risk: Road tunnels where de-icing salts are\u00a0<\/span><\/p>\n

_____\u00a0 \u00a0 used and where de-icing salts may be carried into the tunnel by <\/span><\/span><\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0vehicles<\/span><\/span><\/p>\n

-10 <\/span>\u00a0 \u00a0 \u00a0 Very high exposure risk: M \u2264 0.25 km from the North Sea coast\u00a0<\/span><\/p>\n

____\u00a0 \u00a0 \u00a0 of Germany and all Baltic Sea coastal areas<\/span><\/span><\/p>\n

-15 \u00a0\u00a0<\/span>\u00a0 \u00a0 Very high exposure risk: M \u2264 0.25 km from all other EU coastal<\/p>\n

__\u00a0 \u00a0 \u00a0 \u00a0 \u00a0areas<\/span><\/span>_____<\/span><\/p>\n

___________________________________________________________________________________________________________<\/p>\n

F2<\/sub> \u2013 Risk of Exposure to Sulphur Dioxide<\/strong><\/span><\/p>\n

In European coastal environments, sulphur dioxide concentrations are generally low. In inland environments, concentrations are typically low to moderate. High concentrations are generally found at heavily industrialised sites or in specific environments such as tunnels.<\/p>\n

Sulphur dioxide concentrations can be evaluated according to the method specified in ISO 9225<\/strong>.<\/p>\n

F2<\/sub> categories<\/strong><\/p>\n

-0<\/span>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Low exposure risk: < 10 \u00b5g\/m\u00b3 average gas concentration.<\/p>\n

-5<\/span> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Medium exposure risk: 10\u201390 \u00b5g\/m\u00b3 average gas concentration.<\/p>\n

-10<\/span> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 High exposure risk: 90\u2013250 \u00b5g\/m\u00b3 average gas concentration.<\/p>\n

\n
\n

___________________________________________________________________________________________________________<\/p>\n<\/div>\n<\/div>\n

F3 \u2013 Cleaning or Washing by Rain<\/strong><\/span><\/p>\n

F3 relates to the cleaning regime or washing by rain.\u00a0The following applies:<\/p>\n

If F1 + F2 \u2265 0, then F3 = 0.<\/p>\n

F3<\/sub> categories<\/strong><\/p>\n

–<\/span>0<\/span>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Fully exposed te rain.<\/p>\n

-2<\/span> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Specified cleaning regim.<\/p>\n

-7<\/span>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Not exposed to rain or subject to a specific cleaning regime.<\/p>\n

\n
\n

___________________________________________________________________________________________________________<\/p>\n<\/div>\n<\/div>\n

Calculation of the CRC<\/strong><\/span><\/p>\n

The required Corrosion Resistance Class (CRC)<\/strong> for a given environment is determined by first calculating the Corrosion Resistance Factor (CRF)<\/strong> by adding F1 + F2 + F3.<\/p>\n

The resulting CRF value is then used to assign the stainless steel grade to one of the five corrosion resistance classes.<\/p>\n

Corrosion Resistance Factor (CRF)\u00a0\u00a0\u00a0\u00a0\u00a0 Corrosion Resistance Class (CRC)<\/p>\n

—-_—<\/span>CRF = 1\u00a0<\/span> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 I<\/p>\n

_<\/span>0<\/span> \u2265\u00a0 \u00a0 CRF > -7\u00a0<\/span> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 II<\/p>\n

-7<\/span> \u2265\u00a0 \u00a0 CRF > -15<\/span>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0III<\/p>\n

-15<\/span> \u2265 \u00a0CRF \u2265 -20\u00a0<\/span> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 IV<\/p>\n

——_-<\/span>CRF > -20\u00a0 <\/span>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 V<\/p>\n

\n
Using the above method, the following stainless steel grades can be classified according to their Corrosion Resistance Class (CRC):<\/div>\n
.<\/span><\/div>\n<\/div>\n

I<\/span>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a01.4003 | 1.4016 | 1.4512<\/p>\n

II<\/span>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a01.4301 | 1.4307 | 1.4311 | 1.4541 | 1.4318 | 1.4306 | 1.4567 | 1.4482<\/p>\n

III\u00a0<\/span> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 1.4401 | 1.4404 | 1.4435 | 1.4571 | 1.4429 | 1.4432 | 1.4162 | 1.4662<\/p>\n

—————<\/span>1.4362 | 1.4062 | 1.4578<\/p>\n

IV\u00a0<\/span> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 1.4439 | 1.4462 | 1.4539<\/p>\n

V<\/span>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a01.4529 | 1.4547 | 1.4565 | 1.4410 | 1.4501 | 1.4507<\/p>\n

\n
A stainless steel grade from a higher corrosion resistance class<\/strong> may be used instead of the specified class.<\/div>\n<\/div>\n

.<\/span><\/p>\n

The corrosion resistance classes (CRC<\/strong>) according to EN 1993-1-4<\/strong> are intended only for the stainless steel grades listed above and apply exclusively to structural applications<\/strong>.<\/p>\n

Source:<\/strong> EN 1993-1-4.<\/p>\n

Interested in our range of special fasteners?<\/strong> View here our high-corrosion-resistant and heat-resistant fasteners range<\/a><\/span><\/span><\/span><\/h3>\n

.<\/span><\/p>\n

Despite every effort being made to ensure the accuracy of the information presented above, no guarantee is given regarding its completeness or accuracy<\/strong>. For design purposes, the applicable edition of the relevant standards should always be consulted.<\/p>\n

\n","protected":false},"excerpt":{"rendered":"

Corrosion Resistance Classification of Stainless Steels for Structural Applications According to EN 1993-1-4, stainless steel grades are classified according to their corrosion resistance, depending on the environment in which they are to be used.\u00a0The environmental conditions are assessed using three Corrosion Resistance Factors (CRF). Based on the resulting CRF value, stainless steel grades are assigned […]<\/p>\n","protected":false},"author":2,"featured_media":4627,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_relevanssi_hide_post":"","_relevanssi_pin_for_all":"","_relevanssi_pin_keywords":"","_relevanssi_unpin_keywords":"","_relevanssi_related_keywords":"","_relevanssi_related_include_ids":"","_relevanssi_related_exclude_ids":"","_relevanssi_related_no_append":"","_relevanssi_related_not_related":"","_relevanssi_related_posts":"","_relevanssi_noindex_reason":"","footnotes":""},"categories":[14],"tags":[],"class_list":["post-5991","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"acf":[],"yoast_head":"\nCorrosion Resistance of Stainless Steel acc CRC Classification - GNS Nederland<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.gns-nederland.nl\/en\/corrosion-resistance-of-stainless-steel-acc-crc-classification\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Corrosion Resistance of Stainless Steel acc CRC Classification - GNS Nederland\" \/>\n<meta property=\"og:description\" content=\"Corrosion Resistance Classification of Stainless Steels for Structural Applications According to EN 1993-1-4, stainless steel grades are classified according to their corrosion resistance, depending on the environment in which they are to be used.\u00a0The environmental conditions are assessed using three Corrosion Resistance Factors (CRF). 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