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Manufactured from low-alloy 1.25Cr 0.5Mo flange material, astm a182 f11 flanges are designed for high-temperature, high-pressure environments in thermal power plants, oil refining, and petrochemical boilers. The balanced a182 f11 chemical composition (1.00–1.50% Chromium, 0.44–0.65% Molybdenum) provides superior creep resistance and thermal stability. Available pressure configurations include the high-stress astm a182 f11 weld neck flange, low-pressure f11 slip on flange, and dead-end f11 blind flange in Class 150 through 2500 ratings. Specified across a182 f11 class 1 and class 3 as well as high-strength a182 f11 class 2 flanges, each sa182 f11 flange exhibits robust a182 f11 mechanical properties meeting global f11 flange equivalent standards like UNS K11572 and Werkstoff 1.7337.
Solitaire Overseasis a leading international stockist and exporter of high-precision industrial forgings and piping components. We supply fully certified piping products worldwide with complete EN 10204 3.1 material test report traceability.
| Parameter | Specification |
|---|---|
|
Material |
ASTM A182 or ASME SA182 F11 Class 1, 2 and 3, UNS K11597 (Class 1) and K11572 (Class 2) |
|
Dimension Standards |
ASME B16.5 for NPS 1/2 to 24, ASME B16.47 for larger weld neck and blind sizes, MSS SP 44 |
|
Pressure Class |
Class 150, 300, 600, 900, 1500, 2500 |
|
Facing |
Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
|
Types |
Weld neck, long weld neck, slip on, blind, spectacle blind, socket weld, RTJ |
|
Testing |
Hardness test, PMI, impact test on request, hydrostatic test on request |
|
Certification |
Mill Test Certificate EN 10204 3.1, 3.2 on request, third party inspection on request |
| Grade | C | Mn | P max | S max | Si | Cr | Mo |
|---|---|---|---|---|---|---|---|
|
F11 Class 1 |
0.05 to 0.15 |
0.30 to 0.60 |
0.030 |
0.030 |
0.50 to 1.00 |
1.00 to 1.50 |
0.44 to 0.65 |
|
F11 Class 2 |
0.10 to 0.20 |
0.30 to 0.80 |
0.040 |
0.040 |
0.50 to 1.00 |
1.00 to 1.50 |
0.44 to 0.65 |
| Property | Class 1 | Class 2 |
|---|---|---|
|
Tensile strength, min |
415 MPa (60 ksi) |
485 MPa (70 ksi) |
|
Yield strength, min |
205 MPa (30 ksi) |
275 MPa (40 ksi) |
|
Elongation, min |
20 percent |
20 percent |
|
Reduction of area, min |
Confirm in standard |
30 percent |
|
Hardness |
121 to 174 HBW |
143 to 207 HBW |
| Pipe Normal Diam. | O.D. Flange | Thk. Of Flange Min | Diam. of Hub | Diameter of Raised Face | Length Hub.Y | Thread Length | Diam. of Bolt Circle | Diam. of Bolt Holes | Number of Bolts | Diam. of Bolts (inch) | KG | LB | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
inch |
dn |
O |
C |
X |
G |
Y |
T |
BC |
BH |
BN |
BD |
||
|
1/2" |
15 |
89.00 |
11.20 |
30.20 |
35.10 |
15.70 |
15.70 |
60.50 |
15.80 |
4 |
1/2" |
0.4 |
0.9 |
|
3/4" |
20 |
98.50 |
12.70 |
38.10 |
42.90 |
15.70 |
15.70 |
69.90 |
15.80 |
4 |
1/2" |
0.7 |
1.5 |
|
1" |
25 |
108.00 |
14.20 |
49.30 |
50.80 |
17.50 |
17.50 |
79.30 |
15.80 |
4 |
1/2" |
0.8 |
1.8 |
|
1-1/4" |
32 |
117.50 |
15.70 |
58.70 |
63.50 |
20.60 |
20.60 |
88.90 |
15.80 |
4 |
1/2" |
1.2 |
2.6 |
|
1-1/2" |
40 |
127.00 |
17.50 |
65.00 |
73.20 |
22.40 |
22.40 |
98.60 |
15.80 |
4 |
1/2" |
1.5 |
3.3 |
|
2" |
50 |
152.50 |
19.10 |
77.70 |
91.90 |
25.40 |
25.40 |
120.70 |
19.10 |
4 |
5/8" |
2.3 |
5.1 |
|
2-1/2" |
65 |
178.00 |
22.40 |
90.40 |
104.60 |
28.40 |
28.40 |
139.70 |
19.10 |
4 |
5/8" |
3.7 |
8.1 |
|
3" |
80 |
190.50 |
23.90 |
108.00 |
127.00 |
30.20 |
30.20 |
152.40 |
19.10 |
4 |
5/8" |
4.1 |
9 |
|
3-1/2" |
90 |
216.00 |
23.90 |
122.20 |
139.70 |
31.80 |
31.80 |
177.80 |
19.10 |
8 |
5/8" |
5.1 |
11.2 |
|
4" |
100 |
228.50 |
23.90 |
134.90 |
157.20 |
33.30 |
33.30 |
190.50 |
19.10 |
8 |
5/8" |
5.9 |
13 |
|
5" |
125 |
254.00 |
23.90 |
163.60 |
185.70 |
36.60 |
36.60 |
215.90 |
22.40 |
8 |
3/4" |
7 |
15.4 |
|
6" |
150 |
279.50 |
25.40 |
192.00 |
215.90 |
39.60 |
39.60 |
241.30 |
22.40 |
8 |
3/4" |
8.4 |
18.5 |
|
8" |
200 |
343.00 |
28.40 |
246.10 |
269.70 |
44.50 |
44.50 |
298.50 |
22.40 |
8 |
3/4" |
13 |
28.6 |
|
10" |
250 |
406.50 |
30.20 |
304.80 |
323.90 |
49.30 |
49.30 |
362.00 |
25.40 |
12 |
7/8" |
18 |
39.5 |
|
12" |
300 |
482.50 |
31.80 |
365.30 |
381.00 |
55.60 |
55.60 |
431.80 |
25.40 |
12 |
7/8" |
29 |
64 |
|
14" |
350 |
533.50 |
35.10 |
400.10 |
412.80 |
57.20 |
57.20 |
476.30 |
28.50 |
12 |
1" |
39 |
86 |
|
16" |
400 |
597.00 |
36.60 |
457.20 |
469.90 |
63.50 |
63.50 |
539.80 |
28.50 |
16 |
1" |
47 |
103 |
|
18" |
450 |
635.00 |
39.60 |
505.00 |
533.40 |
68.30 |
68.30 |
577.90 |
31.80 |
16 |
1 1/8" |
57 |
126 |
|
20" |
500 |
698.50 |
42.90 |
558.80 |
584.20 |
73.20 |
73.20 |
635.00 |
31.80 |
20 |
1 1/8" |
76 |
167 |
|
24" |
600 |
813.00 |
47.80 |
663.40 |
692.20 |
82.60 |
82.60 |
749.30 |
35.10 |
20 |
1 1/4" |
97 |
214 |
ASTM A182 Grade F11 low-alloy steel flanges are widely used across high-temperature and high-pressure severe service environments:
Need certified F11 flanges for your project?
Contact Solitaire Overseas Today for live inventory checks, competitive ex-factory quotes, and immediate global dispatch.
It is a low-alloy 1.25Cr 0.5Mo flange material (UNS K11572) engineered for elevated-temperature, high-pressure piping systems requiring high creep resistance and oxidation stability.
The difference lies in heat treatment and strength: a182 f11 class 2 flanges and Class 3 offer higher tensile/yield strength than Class 1 due to normalized-tempered processing.
The f11 flange equivalent designations include UNS K11572, Werkstoff 1.7337 (13CrMo4-5 / 15CrMo), EN 10083-3, BS 1503-620 Gr 27, and sa182 f11 flange standards.
ASTM A182 F11 flanges operate reliably up to 593°C (1100°F) in power generation and boiler steam lines without losing mechanical properties or structural integrity.
Yes, post-weld heat treatment (PWHT) at 620°C–680°C is required for an astm a182 f11 weld neck flange to relieve stress and prevent cracking.
Choose astm a182 f11 flanges for service up to 593°C; select higher-alloy F22 (2.25Cr-1Mo) for severe temperatures above 600°C requiring greater creep strength.
As a trusted stockist and exporter, Solitaire Overseas supplies fully certified ASTM A182 F11 Class 1, Class 2, and Class 3 alloy steel flanges with 100% EN 10204 3.1 material test report traceability, NDT inspection, and immediate worldwide dispatch.
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