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Corrosion Resistance of Duplex Stainless Steel By yaang.com

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Corrosion Resistance of Duplex Stainless Steel By yaang.com

The range of duplex stainless steel allows them to be matched for corrosion resistance with the austenitic stainless steel and ferritic stainless steel grades. There is no single measure of corrosion resistance. However, it is convenient to use the Pitting Resistance Equivalent Number (PREN) as a means of ranking the grades. 
PREN = %Cr + 3.3 x %Mo + 16 x %N 
The following table shows how the duplex stainless steel compare with some austenitic stainless steel and ferritic stainless steel grades. 

Grade EN No/UNS Type Typical PREN
430 1.4016/ 
S43000
Ferritic stainless steel 18
304 1.4301/ 
S30400
Austenitic stainless steel  19
441 1.4509/ 
S43932
Ferritic stainless steel 19
RDN 903 1.4482/ 
S32001
Duplex stainless steel  22
316  1.4401/
S31600
Austenitic stainless steel  24
444 1.4521/ 
S44400
Ferritic stainless steel 24 
316L 2.5 Mo 1.4435 Austenitic stainless steel  26
2101 LDX  1.4162/
S32101
Duplex stainless steel 26
2304 1.4362/ 
S32304
Duplex stainless steel 26
DX2202 1.4062/ S32202 Duplex stainless steel 27 
904L 1.4539/ 
N08904
Austenitic stainless steel 34
2205  1.4462/
S31803/
S32205
Duplex stainless steel 35
Zeron 100  1.4501/
S32760
Duplex stainless steel 41
Ferrinox 255/ 
Uranus 2507Cu
1.4507/ 
S32520/
S32550
Duplex stainless steel  41
2507 1.4410/ 
S32750
Duplex stainless steel 43
6% Mo 1.4547/ 
S31254
Austenitic stainless steel 44

It must be emphasised that this table is only a guide to material selection. It is always important to assess the suitability of a particular with a full knowledge of the corrosive environment.

Source: Zhejiang Yaang Pipe Industry Co., Limited (www.yaang.com)

Article Categories:
Duplex Stainless Steel

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