{"id":31037,"date":"2020-01-21T15:08:29","date_gmt":"2020-01-21T14:08:29","guid":{"rendered":"https:\/\/bolting.eu\/steel-qualities-at-expansion-bolt-and-glue-in-bolt\/"},"modified":"2025-02-11T14:16:02","modified_gmt":"2025-02-11T13:16:02","slug":"steel-qualities-at-expansion-bolt-and-glue-in-bolt","status":"publish","type":"page","link":"https:\/\/bolting.eu\/en\/steel-qualities-at-expansion-bolt-and-glue-in-bolt\/","title":{"rendered":"Steel qualities at expansion bolt and glue in bolt"},"content":{"rendered":"\n

Steel qualities at expansion bolt and glue in bolt<\/h2>\n\n
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Time and again, we stumble across a wide variety of designations and specifications for drilling materials. On the one hand, we read about stainless steel, chrome steel, stainless steel and duplex steel. And then there are the various steel grades. For example, AISI 316L and A4 steel or HCR steel. In short: it’s all quite confusing! We would therefore like to give you an overview of steel grades at expansion bolt and glue in bolt below. Even if you don’t have to be a metallurgist to bolt a climbing route<\/a>. Basic knowledge is important for several reasons. Firstly, it gives you a basic understanding of the subject. This enables you to select the right products for your drilling project, for example.Secondly, it gives you a much better understanding of problems such as stress corrosion cracking and galvanic corrosion. And thirdly, you become aware of where the potential sources of error lie. Both when setting up climbing routes with expansion bolt<\/a>. As well as when setting up climbing routes with glue in bolt<\/a>. <\/p>\n\n

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Overview table<\/h2>\n\n
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Below we present you with a practical overview of the steel qualities at expansion bolt<\/a> and glue in bolt<\/a>.Consequently, the content also applies to lower off \/ climbing anchors<\/a>, bolt hanger<\/a> and screw links \/ quick links<\/a>)(although titanium is not a steel, this metal is listed here for the sake of completeness<\/em>).<\/p>\n\n

\nGerman designation<\/strong>\n<\/td>\nameric. Designation <\/strong>\n<\/td>\nCorrosion resistance<\/strong>\n<\/td>\nService life approx. in years<\/strong>\n<\/td>\nGeographical area of application<\/strong>\n<\/td><\/tr>
\nzinc plated steel\n<\/td>\ngalvanized steel\n<\/td>\nlow\n<\/td>\n2 to 5\n<\/td>\nnowhere if possible\n<\/td><\/tr>
\nA2\n<\/td>\nAISI 304\n<\/td>\no.k.\n<\/td>\n10 to 15\n<\/td>\nonly within the Alps\n<\/td><\/tr>
\nA4\n<\/td> AISI 316<\/td>\nhigh\n<\/td>\n20\n<\/td> up to max. 30km to the coast <\/td><\/tr>
\n\n<\/td>\nAISI 316L\n<\/td>\nhigh\n<\/td>\n20\n<\/td> up to max. 30km to the coast <\/td><\/tr>
\nDuplex steel\n<\/td>\nDuplex steel\n<\/td> very high (especially stress corrosion)<\/td> 20 <\/td>\nnext to industrial areas \/ near the sea\n<\/td><\/tr>
\nHCR steel\n<\/td>\nAISI 904L\n<\/td>\nExtremely high\n<\/td>\n30 years\n<\/td>\nnear the sea\n<\/td><\/tr>
\nTitanium\n<\/td>\nTitanium\n<\/td>\nExtremely high\n<\/td>\n50\n<\/td>\ndirectly by the sea\n<\/td><\/tr><\/tbody><\/table><\/figure>\n\n
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Avoid galvanic corrosion at expansion bolt – bolt hanger<\/a>! Therefore, never install components made of zinc plated steel directly with components made of other steel qualities.<\/p>\n\n

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Classification of stainless steels<\/h2>\n\n
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Stainless steels are divided into four superordinate groups based on their crystalline structure<\/strong>. This helps us with the basic explanation of steel qualities at expansion bolt and glue in bolt: <\/p>\n\n

  1. austenitic steels (chromium steels such as A4 \/ AISI 316 etc.)<\/li>
  2. Ferritic steels (zinc plated expansion bolt or drill hook ash)<\/li>
  3. Duplex steels (e.g. fixed PLX)<\/li>
  4. martensitic steels<\/li><\/ol>\n\n

    Only the first three groups<\/strong> are used for fixed points in mountain sports<\/strong>, such as expansion bolt, glue in bolt and lower offs.We also know stainless steels from the group of austenitic steels <\/strong>under these names:<\/p>\n\n