Duplex Steel Plate Specifications
Duplex Steel UNS S31803/S32205 Sheets, Plates, Coils Specification
| Specifications | : | ASTM A240 / ASME SA240 |
| Standard | : | ASTM, ASME and API |
| Thickness | : | 4.0mm – 100mm, 1 MM TO 200 MM THK IN 1000 MM TO 3000 MM WIDTH x
2500 MM / 5000 MM / 10000 MM / COIL., |
| Specialize | : | Shim Sheet, Perforated Sheet, B. Q. Profile. |
| Form | : | Coils, Foils, Rolls, Plain Sheet, Shim Sheet, Perforated Sheet,
Chequered Plate, Strip, Flats, Blank (Circle), Ring (Flange) |
| Finish | : | Hot rolled plate (HR), Cold rolled sheet (CR), 2B, 2D, BA NO(8),
SATIN (Met with Plastic Coated) |
| Hardness | : | Soft, Hard, Half Hard, Quarter Hard, Spring Hard etc. |
| Grade | : | Duplex 2205(UNS S31803 / S32205), Super Duplex Plates S32760 /
S32750 |
Super Duplex Stainless Steel – Alloy 2507 (UNS S32750 and UNS
S32760) Specifications
- Super Duplex Plates, Sheet, Coil, and Strip: ASTM A240, ASME A 240
- Super Duplex Seamless Pipes / Tubes: ASTM A 789 / 790, ASME SA 789
/ 790
- Super Duplex Welded Pipes / Tubes: ASTM A 789 / 790, ASME SA 789 /
790
- Super Duplex Bars, Rods, Wire: ASTM A 276 / 479, ASME SA 276 / 479
- Super Duplex Pipe Fittings & Flanges: ASTM A 815, ASME SA 815
- Super Duplex Forged Flanges: ASTM A182 Grade F55
- Super Duplex Forgings: ASTM A473
| STAINLESS STEEL | TRADENAME | UNS NO. | WERKSTOFF NO. | DENSITY (G/CM3) |
| Super Duplex | F55 / 2507, F53 | S32760 / S32750 | 1.4501 / 1.4410 | 7.805 |
Super Duplex – S32760 Grade Stainless Steel Chemical Composition, %
| CR | NI | MO | C | W | CU |
| 24.0-26.0 | 6.0-8.0 | 3.0-4.0 | 0.030 Max | 0.5-1.0 | 0.50-1.0 |
| N | MN | SI | P | S | FE |
| 0.2-0.3 | 1.00 Max | 1.0 Max | 0.03 Max | 0.01 Max | Balance |
Super Duplex – S32750 / 2507 Grade Stainless Steel Chemical
Composition, %
| CR | NI | MO | C | N | MN |
| 24.0-26.0 | 6.0-8.0 | 3.0-5.0 | 0.030 Max | .24-.32 | 1.20 Max |
| Si | Cu | P | S | Fe | |
| 0.80 Max | 0.50 Max | 0.035 Max | 0.020 Max | Balance | |
Physical & Mechanical Properties of Super Duplex 2507 Stainless
Steel (UNS S32750 and UNS S32760)
| SUPER DUPLEX STAINLESS STEEL |
| Density | 7.805 |
| Melting Range,℃ | 1350 ℃ |
| Elongation % | 15 min. |
| Tensile Strength (Mpa) | 800 |
| Yield Strngth (Mpa) | 550 |
| Hardness (Brinell) | 270 max |
ABOUT Duplex 2205 Stainless Steel
Duplex 2205 Stainless Steel Introduction
Duplex 2205 Stainless Steel Key Properties
Duplex 2205 Stainless Steel Composition
Duplex 2205 Stainless Steel Mechanical Properties
Duplex 2205 Stainless Steel Physical Properties
Duplex 2205 Stainless Steel Grade Specification Comparison
Duplex 2205 Stainless Steel Possible Alternative Grades
Duplex 2205 Stainless Steel Corrosion Resistance
Duplex 2205 Stainless Steel Heat Resistance
Duplex 2205 Stainless Steel Heat Treatment
Duplex 2205 Stainless Steel Welding
Duplex 2205 Stainless Steel Machining
Duplex 2205 Stainless Steel Fabrication
Duplex 2205 Stainless Steel Applications
Duplex 2205 Stainless Steel Chemical Composition
Fe, <0.03% C, 21-23% Cr, 4.5-6.5% Ni, 2.5-3.5% Mo, 0.8-2.0% N,
<2% Mn, <1% Si, <0.03% P, <0.02% S
Duplex 2205 Stainless Steel Introduction
Duplex 2205 stainless steel (both ferritic and austenitic) is used
extensively in applications that
require good corrosion resistance and strength. The S31803 grade
stainless steel has undergone
a number of modifications resulting in UNS S32205, and was endorsed
in the year 1996.
This grade offers higher resistance to corrosion.
At temperatures above 300°C, the brittle micro-constituents of this
grade undergo precipitation,
and at temperatures below -50°C the micro-constituents undergo
ductile-to-brittle transition;
hence this grade of stainless steel is not suitable for use at
these temperatures.
Duplex 2205 Stainless Steel Key Properties
The properties that are mentioned in the below tables pertain to
flat rolled products such as plates,
sheets and coils of the ASTM A240 or A240M. These may not be
uniform across other products
such as bars and pipes.
Duplex 2205 Stainless Steel Composition
Table 1 provides the compositional ranges for grade 2205 duplex
stainless steel.
Table 1 - Composition ranges for 2205 grade stainless steels
| Grade | | C | Mn | Si | P | S | Cr | Mo | Ni | N |
| 2205 (S31803) | Min Max | - 0.030 | - 2.00 | - 1.00 | - 0.030 | - 0.020 | 21.0 23.0 | 2.5 3.5 | 4.5 6.5 | 0.08 0.20 |
| 2205 (S32205) | Min Max | - 0.030 | - 2.00 | - 1.00 | - 0.030 | - 0.020 | 22.0 23.0 | 3.0 3.5 | 4.5 6.5 | 0.14 0.20 |
Duplex 2205 Stainless Steel Mechanical Properties
The typical mechanical properties of grade 2205 stainless steels
are listed in the table below.
Grade S31803 has similar mechanical properties to that of S32205.
Table 2 - Mechanical properties of 2205 grade stainless steels
| Grade | Tensile Str
(MPa) min | Yield Strength
0.2% Proof
(MPa) min | Elongation
(% in 50mm) min | Hardness |
| Rockwell C (HR C) | Brinell (HB) |
| 2205 | 621 | 448 | 25 | 31 max | 293 max |
Duplex 2205 Stainless Steel Physical Properties
The physical properties of grade 2205 stainless steels are
tabulated below. Grade S31803 has similar physical properties to
that of S32205.
Table 3 – Physical properties of 2205 grade stainless steels
| Grade | Density
(kg/m3) | Elastic
Modulus (GPa) | Mean Co-eff of Thermal
Expansion (μm/m/°C) | Thermal
Conductivity (W/m.K) | Specific
Heat
0-100°C ( J/kg.K) | Electrical
Resistivity
(nΩ.m) |
| 0-100°C | 0-315°C | 0-538°C | at 100°C | at 500°C |
| 2205 | 782 | 190 | 13.7 | 14.2 | - | 19 | - | 418 | 850 |
Duplex 2205 Stainless Steel Grade Specification Comparison
Table 4 provides the grade comparison for 2205 stainless steels.
The values are a comparison of functionally similar materials.
Exact equivalents may be obtained from the original specifications.
Table 4 - Grade specification comparisons for 2205 grade stainless
steels
| Grade | UNS
No | Old British | Euronorm | Swedish SS | Japanese JIS |
| BS | En | No | Name |
| 2205 | S31803 / S32205 | 318S13 | - | 1.4462 | X2CrNiMoN22-5-3 | 2377 | SUS 329J3L |
Duplex 2205 Stainless Steel Possible Alternative Grades
Given below is a list of possible alternative grades, which may be
chosen in place of 2205.
Table 5 - Grade specification comparisons for 2205 grade stainless
steels
| Grade | Reasons for choosing the grade |
| 904L | Better formability is needed, with similar corrosion resistance and
lower strength. |
| UR52N+ | High resistance to corrosion is required, e.g. resistance to higher
temperature seawater. |
| 6%Mo | Higher corrosion resistance is required, but with lower strength
and better formability. |
| 316L | The high corrosion resistance and strength of 2205 are not needed.
316L is lower cost. |
Duplex 2205 Stainless Steel Corrosion Resistance
Grade 2205 stainless steel exhibits excellent corrosion resistance,
much higher than that of grade 316. It resists localized corrosion
types like intergranular, crevice and pitting. The CPT of this type
of stainless steel is around 35°C. This grade is resistant to
chloride stress corrosion cracking (SCC) at temperatures of 150°C.
Grade 2205 stainless steels are apt replacements to austenitic
grades, especially in premature failure environments and marine
environments.
Duplex 2205 Stainless Steel Heat Resistance
The high oxidation resistance property of Grade 2205 is marred by
its embrittlement above 300°C. This embrittlement can be modified
by a full solution annealing treatment. This grade performs well at
temperatures below 300°C.
Duplex 2205 Stainless Steel Heat Treatment
The best suited heat treatment for this grade is solution treatment
(annealing), between 1020 - 1100°C, followed by rapid cooling.
Grade 2205 can be work hardened but cannot be hardened by thermal
methods.
Duplex 2205 Stainless Steel Welding
Most standard welding methods suit this grade, except welding
without filler metals, which results in excess ferrite. AS 1554.6
pre-qualifies welding for 2205 with 2209 rods or electrodes so that
the deposited metal has the right balanced duplex structure.
Adding nitrogen to the shielding gas ensures that adequate
austenite is added to the structure. The heat input must be
maintained at a low level, and the use of pre or post heat must be
avoided. The co-efficient of thermal expansion for this grade is
low; hence the distortion and stresses are lesser than that in
austenite grades.
Duplex 2205 Stainless Steel Machining
The machinability of this grade is low due to its high strength.
The cutting speeds are almost 20% lower than that of grade 304.
Duplex 2205 Stainless Steel Fabrication
The fabrication of this grade is also affected by its strength.
Bending and forming of this grade requires equipment with larger
capacity. Ductility of grade 2205 is lesser than austenitic grades;
therefore, cold heading is not possible on this grade. In order to
carry out cold heading operations on this grade, intermediate
annealing should be carried out.
Duplex 2205 Stainless Steel Applications
Some of the typical applications of duplex steel grade 2205 are
listed below:
- Oil and gas exploration
- Processing equipment
- Transport, storage and chemical processing
- High chloride and marine environments
- Paper machines, liquor tanks, pulp and paper digesters
