UR52N+ grade is one of a group of “super duplex” grades, combining high strength with exceptional corrosion resistance. The addition of copper to this grade gives it greatly improved resistance to strong reducing acids, particularly sulphuric acid. UR52N+ is also very highly resistant to pitting/crevice corrosion in high chloride, hot environments. Its duplex structure also results in excellent resistance to stress corrosion cracking.
ASME SA240 standard specification for chromium and chromium-nickel stainless steel plate, sheet, and strip for pressure vessels and for general applications
Supplementary Technology: HIC Test | NACE MR0175 | Z15 | Z25 | Z35 | S1 | S2|
SAF 2205, also known as Sandvik SAF 2205, is a Sandvik-owned trademark for a 22Cr duplex (ferritic-austenitic) stainless steel. SAF derives from Sandvik Austenite Ferrite. The nominal chemical composition of SAF 2205 is 22% chromium, 5% nickel, 3.2% molybdenum and other alloying elements such as nitrogen and manganese.[1] The UNS designation for SAF 2205 is S31803/S32205 and the EN steel no. is 1.4462. SAF 2205 or Duplex 2205 is often used as an alternative to expensive 904L stainless steel owing to similar properties but cheaper ingredients. Duplex stainless steel is available in multiple forms like bars, billets, pipes, tubes, sheets, plates and even processed to fittings and flanges.
Duplex 2205 Stainless Steel (both austenitic and ferritic) is used in applications that require strength and good corrosion resistance. S31803 was endorsed in year 1996 whereas it underwent number of changes that led to discovery of UNS S32205 which is more widely used. Possible alternates for SAF 2205 are 904L Stainless Steel, UR52N+, 6%Mo and 316L
High resistance to stress corrosion cracking (SCC) in chloride-bearing environments
high resistance to stress corrosion cracking (SCC) in environments containing hydrogen sulphide
high resistance to general corrosion, pitting corrosion, and crevice corrosion
high resistance to erosion corrosion and corrosion fatigue
high mechanical strength - roughly twice the proof strength of austenitic stainless steel
good weld ability
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Grade |
The Element Max (%) |
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|
C |
Mn |
P |
S |
Si |
Cr |
Ni |
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|
ASME SA240 255 |
0.04 |
1.5 |
0.040 |
0.030 |
1.0 |
24-27 |
4.5-6.5 |
|
Mo |
N |
Cu |
Cb |
Ti |
|
|
|
|
2.9-3.9 |
0.1-0.25 |
1.50-2.50 |
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|
|
|
|
|
Grade |
ASME SA240 255 Mechanical Property |
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|
|
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|
Yield |
Tensile |
Elongation |
Hardness, max |
||
|
ASME SA240 255 |
Min Mpa |
Mpa |
Min % |
Brinell |
Rockwell B |
|
550 |
760 |
15% |
302 |
|
|
Transport, storage and chemical processing
Processing equipment
High chloride and marine environments
Oil and gas exploration
Paper machines, liquor tanks, pulp and paper digesters
