HT PIPE supplies the different types of Stainless steel Flanges according to ASTM, ASME, EN, ISO, DIN and JIS
Stainless steel Flanges ASTM materials:
ASTM A182: Covers forged stainless steel flanges
ASTM A240: Specifies stainless steel plates for flanges
Grades: F304, 304L, 304H, 316, 316L, 310S, 347, 347H, 317, 317L, 904L, 254SMO, 2205, 2507 etc
Stainless steel Flanges Types:
Types: WN Flange, LWN Flange, SO Flange, SW Flange, Blind Flange, Plate Flange, Threaded Flange, Lap Joint Flange, Orifice Flange, Spectacle blind flange.
Special products: rings, forged parts, disc, shaft sleeve
Sealing Surface: RF FF RTJ TF GF LF LM
The main Stainless steel Flanges Specifications:
Stainless steel WN Flanges Specifications:
Standard: ASME B16.5, ASME B16.47A, ASME B16.47B, EN, BS
Class: 150#-2500#, PN2.5-PN100
Size: 1/2”-48”, DN10-DN4000
Stainless steel SO Flanges Specifications:
Standard: ASME B16.5, DIN2543, DIN 2544, DIN 2545
Class: 150#-2500#, PN16, PN25, PN40
Size: 1/2”-24”, DN10-DN1000
Stainless steel SW Flanges Specifications:
Standard: ASME B16.5
Class: 150#-1500#
Size: 1/2"-3"(Except 1500# 1/2"-2 1/2")
Stainless steel Threaded Flanges Specifications:
Standard: ASME B16.5, DIN2565, DIN2567, DIN2568, DIN2569, JIS B2220
Class: 150#-900#, 1500#, 2500#, PN6, PN16, PN25, PN40, PN64, PN100
Size: 1/2"-24", DN6-DN200
Stainless steel Blind Flanges Specifications:
Standard: ASME B16.5, ASME B16.47A, ASME B16.47B, DIN2527, EN
Class: 75#-2500#, PN2.5-PN100
Size: 1/2"-48", DN10-DN4000
More Flanges standard and siza info please check the ANSI FLnge Standard: https://www.htpipe.com/d/files/flanges-standard/ansi-flange-standard-ht-pipe.pdf
Stainless steel Flanges Chemical Composition:
| Grade |
UNS |
C≤ |
Mn |
P≤ |
S≤ |
Si≤ |
Cr |
Mo |
Ni |
| 304 |
S30400 |
0.07 |
2 |
0.045 |
0.03 |
0.75 |
17.5-19.5 |
- |
8.0-10.5 |
| 304L |
S30403 |
0.03 |
2 |
0.045 |
0.03 |
0.75 |
17.5-19.5 |
- |
8.0-12.0 |
| 304H |
S30409 |
0.04-0.10 |
2 |
0.045 |
0.03 |
0.75 |
18.0-20.0 |
|
8.0-10.5 |
| 316 |
S31600 |
0.08 |
2 |
0.045 |
0.03 |
0.75 |
16.0-18.0 |
2.00-3.00 |
10.0-14.0 |
| 316L |
S31603 |
0.035 |
2 |
0.045 |
0.03 |
0.75 |
16.0-18.0 |
2.00-3.00 |
10.0-14.0 |
| 316Ti |
S31635 |
0.08 |
2 |
0.045 |
0.03 |
0.75 |
16.0-18.0 |
2.00-3.00 |
10.0-14.0 |
| 317 |
S31700 |
0.08 |
2 |
0.045 |
0.03 |
0.75 |
18.0-20.0 |
3.0-4.0 |
11.0-15.0 |
| 317L |
S31703 |
0.03 |
2 |
0.045 |
0.03 |
0.75 |
18.0-20.0 |
3.0-4.0 |
11.0-15.0 |
| 321 |
S32100 |
0.08 |
2 |
0.045 |
0.03 |
0.75 |
17.0-19.0 |
- |
9.0-12.0 |
| 310S |
S31008 |
0.08 |
2 |
0.045 |
0.03 |
1.5 |
24.0-26.0 |
- |
19.0-22.0 |
| 347 |
S34700 |
0.08 |
2 |
0.045 |
0.03 |
0.75 |
17.0-19.0 |
- |
9.0-13.0 |
| 254SMO |
S31254 |
0.02 |
1 |
0.03 |
0.01 |
0.8 |
19.5-20.5 |
6.0-6.5 |
17.5-18.5 |
| AL-6XN |
N08367 |
0.03 |
2 |
0.04 |
0.03 |
1 |
20.0-22.0 |
6.0-7.0 |
23.5-25.5 |
| F904L |
N08904 |
0.02 |
2 |
0.045 |
0.035 |
1 |
19.0-23.0 |
4.0-5.0 |
23.0-28.0 |
| 2205 |
S31803 |
0.03 |
2.00 |
0.03 |
0.02 |
1.00 |
21.0–23.0 |
2.5–3.5 |
4.5–6.5 |
| 2205 |
S32205 |
0.03 |
2.00 |
0.03 |
0.02 |
1.00 |
22.0–23.0 |
3.0–3.5 |
4.5–6.5 |
| 2507 |
S32750 |
0.03 |
1.20 |
0.035 |
0.02 |
0.80 |
24.0-26.0 |
3.0-5.0 |
6.0-8.0 |
Stainless steel Flanges Mechanical Properties:
| Mechanical properties |
Tensile, min, ksi[MPa] |
Yield, min, ksi[MPa] |
Elongation, %(min) |
| 304 |
75【515】 |
30【205】 |
40 |
| 304L |
70【485】 |
25【170】 |
40 |
| 304H |
75【515】 |
30【205】 |
40 |
| 316 |
75【515】 |
30【205】 |
40 |
| 316L |
70【485】 |
25【170】 |
40 |
| 316Ti |
75【515】 |
30【205】 |
40 |
| 317 |
75【515】 |
30【205】 |
35 |
| 317L |
75【515】 |
30【205】 |
40 |
| 321/H |
75【515】 |
30【205】 |
40 |
| 310S |
75【515】 |
30【205】 |
40 |
| 347/H |
75【515】 |
30【205】 |
40 |
| S31254 |
95 [655] |
44 [305] |
35 |
| N08367 |
95 [655] |
45 [310] |
30 |
| N08904 |
71【490】 |
31【220】 |
35 |
| S31803 |
90 [620] |
65 [450] |
25 |
| S32205 |
95 [655] |
65 [450] |
25 |
| S32750 |
116 [800] |
80 [550] |
15 |
Stainless steel Flanges Production Methods
Forging， Casting， Machining
Flanges cut from stainless steel bars or plates for custom sizes or low-volume production.
Heat Treatment:
Solution Annealing: Heated to 1,050–1,100°C and quenched to restore corrosion resistance.
Stress Relieving
Surface Treatment:
Pickling/Passivation: Removes iron contaminants and enhances the passive oxide layer.
Electropolishing: Improves hygiene and aesthetics (common in food/pharma)
Stainless steel Flanges Testing and Quality Assurance
PMI
Size
Non-Destructive Testing (NDT)
Radiographic (RT) and Ultrasonic (UT) Testing
Dye Penetrant (PT) and Magnetic Particle (MT) Testing: Identify surface cracks.
Hydrostatic Testing
Mechanical Testing: Tensile, impact, and hardness tests
Corrosion Testing:
ASTM G48: Evaluates pitting and crevice corrosion resistance.
Intergranular Corrosion (IGC) Test: For sensitized austenitic grades.
Stainless steel Flanges Applications
Oil & Gas: Offshore platforms, pipelines (duplex grades for chloride-rich environments).
Chemical/Petrochemical: Handling acids, alkalis, and corrosive media (super austenitic grades).
Food & Beverage: electro polished surfaces (316L).
Pharmaceuticl: Sterile systems requiring cleanability and corrosion resistance.
Power Generation: High-temperature steam lines (321/347).
Marine: Seawater cooling systems (316/2205).
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