Technical Paper Nominal mm
10 8
10 12
Measured mm
8,97 7,8 9,7
11,7 Check diameter - some examples found in several countries
In some areas we have to make anchors thicker so they resist chemical attack longer rather than changing the type of alloy used.
We can give a summary of the issues that anchors have to cope with as: • Temperature • Oxidation • Corrosion from sulphur/sulphuric acid • Sigma phase formation • Vibration from other equipment • Thermal cycling • Carburization • Creep
Creep deformation test, the alloy rings (1mm thick) have been exposed to 35 hours at 1000°C. AISI 310 and AISI 309 are deformed under their own weight but 253MA and AISI 330 are very stable
Difference in cross section weight, price, strength %
-19 % -5 % -6 %
-4,85 % AISI 310 AISI 309 AISI 330 253 MA
www.ireng.org
In some countries, they don’t mention any DIN for the wire and diameters are not respected
Ø6
DIN EN 10278 (DIN 671)
Tolerance on Ø +0/-0,030mm 28,27 mm2
Nominal cross section
Cross section
minimum Difference
Ø8 Floating anchor Welded anchor 27,99 mm2 0,99%
DIN EN 10278 (DIN 671)
Tolerance on Ø +0/-0,036mm 50,26 mm2
Nominal cross section
Cross section
minimum Difference
49,81 mm2 0,90%
DIN EN 10060 (DIN 1013)
+/-0,4 mm 28,27 mm2
24,63 mm2 12,88%
DIN EN 10060 (DIN 1013)
+/-0,4 mm 50,26 mm2
45,36 mm2 9,75% Comparison between different DIN standards
DIN EN 10218 (DIN 177)
+/-0,15 mm 28,27 mm2
26,88 mm2 4,92%
DIN EN 108-2 (DIN 177)
+/-0,15 mm 50,26 mm2
48,40 mm2 3,70%
The two anchors in AISI 304 are fully oxydised and completely destroyed, the anchor in AISI 310 is in good shape
16
Another example of fake AISI 310, after analysis we found it was AISI 304, the anchors were destroyed because the operating temperature was too high for AISI 304
ENGINEER THE REFRACTORIES March 2018 Issue
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