TITLE: Selection of Duplex 2205 over Stainless steel 316L
David
Star
CLIENT:
Star
COMPANY: L.J.
03-06
北魏皇帝列表REF:
LJS
赵薇致青春2006
人教版一年级下册数学电子课本
DATE: 26
October
Hira Ahluwalia
Dr. Hira Ahluwalia
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Background:L.J. Star supplies high quality Duplex stainless steel 2205 sight windows to various industries. The duplex 2205 sight windows are superior to 316L in corrosion
resistance and other fabrication properties. Unfortunately, there is some
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misinformation being spread in the industry regarding the corrosion resistance of
duplex alloys. A large amount of data exists on the WEB, (e.g. Nickel Institute web
site and IMOA website) that shows the superior performance of duplex alloys. This
report provides a brief summary of the corrosion resistance of duplex alloys
税前和税后的区别compared with 316L stainless steel.
Corrosion resistance:Duplex stainless steels exhibit a high level of corrosion resistance in most environments where the standard austenitic grades are uful. However, there are
some notable exceptions where they are decidedly superior. This results from their
high chromium content, which is beneficial in oxidizing acids, along with sufficient
molybdenum and nickel to provide resistance in mildly reducing acid
environments. The relatively high chromium, molybdenum and nitrogen also give
them very good resistance to chloride pitting and crevice corrosion. Their duplex
structure is an advantage in potential chloride stress corrosion cracking
environments. Duplex alloys are more resistant to chloride stress corrosion
cracking than Types 304 and 316.
Pitting and Crevice Corrosion Resistance七夕干什么
The high chromium, molybdenum and nitrogen contents in duplex grades provide
very good resistance to chloride-induced localized corrosion in aqueous
environments. All but the very lowest alloyed duplex stainless steels are far
superior to Type 316 in this respect. Depending on the alloy content, some duplex
grades are among the best performing stainless steels. Becau they contain
relatively high chromium content, duplex stainless steels provide a high level of
corrosion resistance very economically. A comparison of pitting and crevice
corrosion resistance for a number of stainless steels in the solution annealed
condition as measured by the ASTM G 48 procedures (10% ferric chloride) is
given in Figure 1. Critical temperatures for materials in the as-welded condition
would be expected to be somewhat lower. Higher critical pitting ( CPT) or crevice
corrosion temperatures (CCT) indicate greater resistance to the initiation of the
forms of corrosion. The CPT and CCT of 2205 are well above tho of Type 316.
This makes 2205 a versatile material in applications where chlorides are
concentrated by evaporation, as in the vapor spaces of heat exchangers or beneath
insulation. The CPT of 2205 indicates that it can handle many brackish waters and
de-aerated brines. It has been successfully ud in awater applications where the
surface has been maintained free of deposits through high flow rates or other
means. Figure 2 shows the CCT as a function of PRE number.
Summary:There is no doubt that duplex 2205 has superior corrosion resistance than 316L in many chloride containing environments. The author has been involved with many
applications where duplex 2205 replaced 316L becau of better corrosion
performance.
1
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Figure 2. Critical crevice temperature as a function of PRE number.
