Duplex Stainless Steel is a type of steel containing the high amount of chromium and minimum amount of nickel. It provides great strength and resistance to corrosive environments. It is used in desalination plants, heat exchangers, and marine processes.
Duplex Stainless Steel is a type of austenitic stainless steel that comprises of nickel and chromium majorly, along with other elements like nitrogen and molybdenum. This stainless steel alloy offers good resistance to localized as well as to uniform corrosion. The duplex microstructure of the alloy contributes to the high strength and high resistance to stress corrosion cracking. It has good weld ability and offers many beneficial properties of ferritic and austenitic steels combined.
Duplex Stainless Steel gives very good resistance to pitting and crevice corrosion and has high resistance to stress corrosion cracking and corrosion fatigue. It displays high mechanical strength and also provides good abrasion and erosion resistance. It is used in chemical, Oil and gas and marine industries. Other uses if the duplex stainless steel is in pollution control equipments, pulp & paper manufacturing, seawater desalination plants and in flue-gas cleaning to name a few.
· Low cost
· Alternative to high nickel based alloys
· High strength
· Corrosion resistant
· Very hard machining
Specification: ASTM A790 (Seamless Pipes) ASTM A928 (Welded Pipes)
Grade | Chemical Composition | |||||||||
C (max) | Si (max) | Mn (max) | P (max) | S (max) | Cr | Ni | Mo | N | Cu | |
S32750 | 0.030 | 0.8 | 1.2 | 0.030 | 0.015 | 24.0-26.0 | 6.8-8.0 | 3.0-5.0 | 0.24-0.32 | 0.5 max |
S13803 | 0.030 | 1.0 | 2.0 | 0.030 | 0.020 | 21.0-23.0 | 4.50-6.50 | 2.50-3.50 | 0.08-0.20 | |
Grade | Physical Propertie | |||
Y.S. MPa (min) | T.S. MPa (min) | Elongation % | Hardness HRC | |
S32750 | 550 | 800 | 15 | 31 |
S13803 | 450 | 620 | 25 | 31 |
W.T. | 1.0 | 1.2 | 1.5 | 1.65 | 2.0 | 2.11 | 2.5 | 3.0 | 3.5 | 4.0 | 4.5 | 5.0 | 5.5 | 6.0 | 6.5 | 7.0 | 7.5 | 8.0 | 8.5 | 9.0 |
15 | ||||||||||||||||||||
16 | ||||||||||||||||||||
18 | ||||||||||||||||||||
19.05 | ||||||||||||||||||||
22 | ||||||||||||||||||||
25.4 | ||||||||||||||||||||
31.8 | ||||||||||||||||||||
35 | ||||||||||||||||||||
38.1 | ||||||||||||||||||||
42 | ||||||||||||||||||||
45 | ||||||||||||||||||||
50.8 | ||||||||||||||||||||
55 | ||||||||||||||||||||
60 | ||||||||||||||||||||
65 | ||||||||||||||||||||
70 | ||||||||||||||||||||
75 | ||||||||||||||||||||
80 | ||||||||||||||||||||
90 | ||||||||||||||||||||
101.6 | ||||||||||||||||||||
114.3 | ||||||||||||||||||||
121 | ||||||||||||||||||||
127 | ||||||||||||||||||||
133 | ||||||||||||||||||||
141.3 | ||||||||||||||||||||
159 | ||||||||||||||||||||
168.3 |
Steel No. | Standard No. | Type | Chemical composition | Other | ||||||||||||
C | Si | S | P | Mn | Cr | Ni | Mo | Other | ób | ós | δ5 | HB | ||||
0Cr26Ni5Mo2 | GB1220 | Bar | 0.08 | 1 | 0.03 | 0.035 | 1.5 | 23-28 | 3-6 | 1-3 | 590 | 390 | 18 | 277 | ψ%:40 | |
0Cr26Ni5Mo2 | GB4237 | Plate | 0.08 | 1 | 0.03 | 0.035 | 1.5 | 23-28 | 3-6 | 1-3 | 590 | 390 | 18 | 277 | ||
0Cr26Ni5Mo2 | GB/T14976 | Pipe | 0.08 | 1 | 0.03 | 0.035 | 1.5 | 23-28 | 3-6 | 1-3 | 590 | 390 | 18 | |||
00Cr18Ni5Mo3Si2 | GB1220 | Bar | 0.03 | 1.3-2 | 0.03 | 0.035 | 1.2-1.6 | 18-19.5 | 4.5-5.5 | 2.5-3 | 590 | 390 | 20 | ψ%:40 | ||
00Cr18Ni5Mo3Si2 | GB4237 | Plate | 0.03 | 1.3-2 | 0.03 | 0.03 | 1.2-1.6 | 18-19.5 | 4.5-5.5 | 2.5-3 | N:0.1 | 590 | 390 | 20 | ||
HDR | Q/SJB11-99 | Pipe | 0.03 | 1 | 0.03 | 0.035 | 2 | 23-26 | 4.5-7.5 | 2-3 | 650 | 450 | 27 | |||
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