26 - 48" RF FF RTJ 2205 Weld Neck Duplex Stainless Steel Pipe
Flanges ASME B16.47 Series B
ASME B16.47(Large Diameter Steel Flanges) is a standard for large diameter steel flanges sized from NPS 26
through NPS 60. The latest version provides dimensions and ratings
in both metric and inch units. The ASME B16.47 inherently
incorporate MSS SP-44: Steel Pipeline Flanges and API 605: Large
Diameter Carbon Steel Flanges. Therefore, the MSS SP-44 flanges are
designated as ASME B16.47 Series A flanges, while API 605 flanges
are designated as ASME B16.47 Series B flanges within this
standard. Materials covered in this standard are as that in ASME
B16.5 except for nickel alloys which means they share the same
pressure-temperature chart for the selection of flange materials.
2.ASME B16.47 Series B / API 605 Class 600 WN
| Norminal Pipe Size | O.D.of Flange, O | Min.Thick-ness of WN Flange, tf | Lenth Through Hub, Y | Diam. of Hub, X | Hub Diam. Top, A | Raised Fase Diam., R | Bore (XS) | Diam of Bolt Circle | No.of Bolt Holes | Diam.of Bolt Hole | Min.Fillet Radius, r1 | Approxi-mate Weight kgs |
| 26 | 890 | 111.2 | 181 | 698 | 660.4 | 727 | 635.0 | 806.4 | 28 | 44.5 | 13 | 259.28 |
| 28 | 950 | 115.9 | 190 | 752 | 711.2 | 784 | 685.8 | 863.6 | 28 | 47.6 | 13 | 299.55 |
| 30 | 1020 | 125.5 | 205 | 806 | 762.0 | 841 | 736.6 | 927.1 | 28 | 50.8 | 13 | 372.00 |
| 32 | 1085 | 130.2 | 216 | 860 | 812.8 | 895 | 787.4 | 984.2 | 28 | 54.0 | 13 | 432.05 |
| 34 | 1160 | 141.3 | 233 | 914 | 863.6 | 953 | 838.2 | 1054.1 | 24 | 60.3 | 14 | 542.78 |
| 36 | 1215 | 146.1 | 243 | 968 | 914.4 | 1010 | 889.0 | 1104.9 | 28 | 60.3 | 14 | 593.49 |
3.DUPLEX Steel 2205:Stainless Steel - Grade 2205 Duplex (UNS
S32205)
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
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.
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.
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 |
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 |
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 |
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 |
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. |
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.
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.
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.
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.
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.
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.
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
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based on your drawings.
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