Super duplex Steel

Super duplex Steel

Super duplex stainless steel
refers to duplex steel containing PREN > 40
containing 25%Cr and molybdenum (> 3.5%) and
high nitrogen (0.220.30%)
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Super duplex steel

      Super duplex stainless steel refers to duplex steel containing PREN > 40, containing 25%Cr and molybdenum (> 3.5%) and high nitrogen (0.220.30%). The main grades are UNS S32550 (UR52N), S32750 (SAF 2507) and S32760 (Zeron 100), respectively, which are French CLI,. Sweden SANDVIK and UK MATER PLATT and other companies developed, their deformation materials were published in 1990 and 1991 respectively, in recent years into the market. The composition of these three steels is similar, but the difference is tungsten The content of copper is different from that of copper. 

Main Brand of Super Duplex Steel in China at present 2507 (S32750)

     2507 (UNS S32750) duplex stainless steel has strong strength and corrosion resistance and is mainly used in chemical processing, petrochemical and submarine equipment. It has strong resistance to chloride corrosion, high thermal conductivity and low coefficient of thermal expansion. High chromium, molybdenum and nitrogen content it has a high resistance to spot corrosion, crack corrosion and general corrosion ability. Its impact strength is also very high. 2507 alloy is not suitable for use at a temperature higher than 570 ℃, and its toughness will be reduced if it is in this environment for a long time. Its chemical composition and mechanical properties are shown in Table 1 / 2.Table 1 Chemical constituents (%)

grade of steel

C≤

Mn≤

Si≤

S≤

P≤

Cr

Ni

Mo

Cu≤

N

S32750(SAF2507)

00Cr25Ni7Mo4N

0.03

1.2

0.8

0.02

0.035

24/

26

6.0/

8.0

3.0/

5.0

0.5

0.24/

0.32

S31803(SAF2205)00Cr22Ni5Mo3N

0.03

2.0

1.0

0.02

0.03

21/

23

4.5/

6.5

2.5/

3.5


0.08/

0.20

S31500(3RE60)

00Cr18Ni5Mo3Si2

0.03

1.2/

2.0

1.4/

2.0

0.03

0.03

18/

19

4.25

5.25

2.5/

3.0


0.05/

0.10

Steel number

heat treating regime ℃

σb (Mpa)

σs(Mpa)

δ%

hardness≤


Boucher's

Boucher's






S32750(SAF2507)

00Cr25Ni7Mo4N

1025-1125

shrend

800

550

15

310

32

S31803(SAF2205)

00Cr22Ni5Mo3N

1020-1100

shrend

620

450

25

290

30.5

S31500(3RE60)

00Cr18Ni5Mo3Si2

980-1040

shrend

630

440

30

290

30.5

Table 2. Mechanical properties

Super Duplex Steel1Super Duplex Steel2Super Duplex SteelSuper Duplex Steel3

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