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Technical information Chapter 9: Comments on the Standards for Stainless Steel All the given data in the table are according to the new Euro Norm (EN), which, roughly, is the same as the old, German Werkstoff Nummer (W.Nr.). To the far right, the closest parallel AISI and SS numbers are given, however, take note that 100 % correlation is rarely seen. The “translation” in between the systems is merely approximate. In addition, jumping from W.Nr. to EN may cause some confusion. As a rule of the thumb, it’s quite safe to “translate” directly from W.Nr. to EN and use EN 1.4307 instead of the W.Nr. 1.4307 showed on the blueprint. Admittedly, EN 1.4307 has a lower limit for the chromium content (Cr) which happens to be 0.5 % above that of the W.Nr., however, Cr just benefits the corrosion resistance, so we actually get a small improvement. In short: “Don’t worry, be happy”, and use the new EN numbers without problems. Low-Carbon vs. ”Common” Grades Another common source of confusion is the carbon content of the steels.. For all austenitic, ferritic and the ferritic-austenitic (duplex) grades, carbon is an unwanted impurity, and for that reason the carbon content of all standards is given as an upper limit. In parallel with the increasing efficiency of the mills, this limit has gradually moved down. In the good old days, just 20 years ago, the state of the art was a carbon content of 0.07 or 0.08 %, however, nowadays the low-carbon grades with maximum 0.03 % C are much more common – in particular for European made stainless steel. On many blueprints, one may still see lots of old high-carbon steel grades, such as W.Nr. 1.4301, AISI 304, or AISI 316, but nowadays, the steel is frequently marked EN 1.4307, AISI 304L or AISI 316L, respectively. The only chemical difference between an AISI 304 and a 304L is the carbon content, however, don’t worry about that. An AISI 304L always fulfills the chemical requirements of the “old” 304 and can easily be used as a substitute. Similarly, the 4307 or 4404 can replace the highcarbon 4301 or 4401, respectively. In short: It’s almost always possible to replace a “normal” alloy with max. 0,07 or 0,08 % C with the corresponding low-carbon with max. 0.03 %. The only exception occurs when the mechanical strength is critical at temperatures above 4-500 °C. For other purposes, the easy switch may be made. Fortunately, both sheets and tubes tend to be double-certified showing both 4301 and 4307, in which case all doubt should be erased. For further information regarding the standards, the carbon content and the possibilities of changing in between the steel grades, we refer to the book ”Stainless steel and Corrosion” (Claus Qvist Jessen, <strong>Damstahl</strong>, October 2011). The book can be ordered via www.damstahl.dk. 321 www.damstahl.com 01.2013
Håndafgratningsværktøjer - for Den Perfekte Finish B30 M E200 E111 B20 E100 B10 E B I over 40 år har SHAVIV været betragtet som det førende mærke inden for professionel hånd afgratningsværktøjer til metal- og plastindustrien. SHAVIV er enkle og effektive værktøjer til afgratning af metaller, plastik, keramik og en række andre materialer. Det brugervenlige håndtag ”MANGO II” er fleksibelt og nemt at anvende. Hurtigt t kan du finde det rette afgratningsværktøj til opgaven. Sutton Tools VARGUS Scandinavia a/s Danmarksvej 28 , 8660 Skanderborg www.vargus.dk vargus@vargus.dk
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Produktkatalog Damstahl - a member
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Damstahl - a memeber of the NEUMO-E
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Levnedsmiddelfittings / Hygienic fi
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A Levnedsmiddelfittings / Hygienic
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Unionsoversigt Union survey DIN Sve
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Clampoversigt Clamp survey DIN Mini
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Gevindfittings / Threaded fittings
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Klemringsfittings / Compression fit
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Klemringsfittings / Compression fit
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Kuglehaner / Ball valves Kuglehane
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Svejsefittings Flanger Indhold - Sv
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Bøjning N112 Svejst bøjning, 90°
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Rørholder N114 Rørholder med svej
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Rørholder N115 Rørholder i par, m
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Konus N124 Svejste konus, koncentri
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Konus N 124 Svejste konus, koncentr
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T-stykke N127 Svejst t-stykke, opkr
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T-stykke N128 Svejst t-stykke, pres
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Endebund N140 Endebund, kløpperfor
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Svejsekrave N116 Svejsekraver, ISO
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Løsflange N118 Løsflange af alumi
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Løsflange N120 Løsflange, NT 16,
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Løsflange N121 Galvaniseret løsfl
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Svejseflange N123 Svejseflange med
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Blindflange N126 Blindflange, NT 10
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Pressfittings / Pressfittings Muffe
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Pressfittings / Pressfittings Bøjn
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Pressfittings / Pressfittings Overg
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Pressfittings / Pressfittings Adapt
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Pressfittings / Pressfittings T-sty
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Pressfittings / Pressfittings T-sty
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Pressfittings / Pressfittings Venti
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Pressfittings / Pressfittings Bøjn
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Pressfittings / Pressfittings Rørb
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Pressfittings / Pressfittings Pakni
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Rørkoblinger Index - Rørkoblinger
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Rørkobling N200 Rørkobling, NT 10
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Rørkobling N205 Rørkobling, træk
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Koldtvalsede plader Glødede og bej
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Koldtvalsede plader Slebne 1 side,
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Varmtvalsede båndplader Glødede o
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Varmtvalsede tåreplader Glødede o
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Stangstål / Bars Rundstål Varmval
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Stangstål / Bars Rundstål Varmtva
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5.000 m 2 på et år! Stangstål og
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Stangstål / Bars Rundstål, Blankt
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Stangstål / Bars Sekskantet Rustfr
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Stangstål / Bars Fladstål Varmtva
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Stangstål / Bars Fladstål Varmtva
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Stangstål / Bars Fladstål Blanktr
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Stangstål / Bars Fladstål Slebet
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Stangstål / Bars Vinkelstål Glød
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Stangstål / Bars b TB-profiler Las
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Svejste stålrør Kalibrerede og gl
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Svejste stålrør Kalibrerede og gl
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Svejste stålrør Ikke glødede Wel
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Svejste stålrør Ikke glødede Wel
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SUPER DAIRY ® - reducer risikoen f
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Svejste levnedsmiddelrør, DS Indve
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Svejste profilrør Slebne eller usl
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Sømløse rør / Seamless tubes Sø
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Emnerør Glødede og bejdsede Hollo
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Tolerancer for emnerør Rustfrie og
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Tolerancer for emnerør Rustfrie og
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Videnspakker BLUE-IQ Vælg den vide
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Damstahl - meget mere end rustfrit
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Index - Teknisk information 1 Hvad
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Teknisk information Kapitel 1: Hvad
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Teknisk information Kapitel 2: Rust
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Teknisk information Kapitel 3: Anve
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Teknisk information Kapitel 5: Ferr
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Teknisk information Kapitel 6: Bear
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Teknisk information Kapitel 7: Kemi
Page 234 and 235: Teknisk information Kapitel 8: Svej
Page 240 and 241: Kapitel 9: Tabel over de hyppigst a
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Page 246 and 247: Technical information Chapter 1: Wh
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Page 256 and 257: Technical information Chapter 4: Co
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Page 287: Damstahl a/s Danmarksvej 28 DK-8660
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