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Technical requirements for duplex stainless steel
Time:2011-6-3
     1, duplex stainless steel Features: duplex stainless steel is a solid solution in the ferrite organization similar to each half of the austenitic phase, the phase of the general content of less need to reach 30%. In the case with the lower C, Cr content 18% ~ 28%, Ni content of 3% to 10%. Some steel also contains Mo, Cu, Nb, ti, N and other alloying elements. Both austenitic class steel and ferritic stainless steel features, compared with the ferrite, plastic, higher toughness, no room temperature brittle, intergranular corrosion resistance and welding properties were significantly improved, while maintaining iron 475 ℃ ferritic stainless steel brittle and high thermal conductivity, with superplastic characteristics. Compared with the austenitic stainless steel, high strength and resistance to intergranular corrosion and stress corrosion compounds significantly improved. Duplex stainless steel has excellent resistance to pitting corrosion.
     2, I started the company since the nineties of last century, the production of duplex stainless steel, the company has its own foundry, you can control the entire process of production, bundle CD-4MCu 2025, to 2205, until recent years widely used in 2507, my company in the years of production, and explore the many unique experiences to ensure the qualified products used in various fields. Especially for high chloride content of the transmission medium, the sea transport. The success of APL and other power companies in India 2507 produced water circulation pump, high chloride ion in the Indian region (containing up to 20000mg / l) of water and long-term use.
     3, commonly used indicators of physical and chemical properties of duplex stainless steel (ASTM A790/790M-02):
Steel
C≤
Mn≤
Si≤
S≤
P≤
Cr
Ni
Mo
Cu≤
N
S32750(SAF2507)
00Cr25Ni7Mo4N
0.03
1.20
0.80
0.020
0.035
24.0/26.0
6.0/8.0
3.0/5.0
0.50
0.24/0.32
S31803(SAF2205)
00Cr22Ni5Mo3N
0.03
2.00
1.0
0.02
0.030
21.0/23.0
4.50/6.50
2.50/3.50
 
0.08/0.20
S31500(3RE60)00C
r18Ni5Mo3Si2
0.03
1.2/2.00
1.4/2.00
0.030
0.030
18.0/19.0
4.25/5.25
2.50/3.00
 
0.05/0.10
2) Mechanical Properties
Project / Steel
℃ heat treatment
σb (Mpa)
σs(Mpa)
δ%
Hardness≤
Brinell
Rockwell
S32750(SAF2507)
00Cr25Ni7Mo4N
1025-1125
Water quenched
800
550
15
310
32
S31803(SAF2205)
00Cr22Ni5Mo3N
1020-1100
Water quenched
620
450
25
290
30.5
S31500(3RE60)
00Cr18Ni5Mo3Si2
980-1040
Water quenched
630
440
30
290
30.5