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Stainless Steel 304 Flanges | Stainless Steel 304L Flanges

ASTM A182 Gr. F304L slip on flanges with raised face (SO/RF), ASME B16.5 Class 150 8", supplied to Selangor, Malaysia.

  • Description

Stainless steel 304/ 304L flanges may be manufactured in accordance with ASME B16.5 or ASME B16.47 with nominal composition of 18Cr-8Ni. The letter “L” denotes low-carbon version of the 304 stainless steel. The flanges may be made from forgings, castings, or plates covering various types and classes of ASME B16.5 and ASME B16.47 (both Series A and Series B). Stainless steel 304/ 304L flanges of ASME B16.5 are available in Classes 150, 300, 400, 600, 900, 1500, 2500; that of ASME B16.47 Series A are available in Classes 150, 300, 400, 600, 900; that of ASME B16.47 Series B are available in Classes 75, 150, 300, 400, 600, 900.

Chemical Composition Requirements

ElementF304F304L
C≤0.08≤0.03
Mn≤2.00≤2.00
P≤0.045≤0.045
S≤0.030≤0.030
Si≤1.00≤1.00
Ni8.0-11.08.0-13.0
Cr18.0-20.018.0-20.0
N≤0.10≤0.10
*Composition requirements for ASTM A182 Gr. F304 and F304L, %.

ElementTP304TP304L
C≤0.08≤0.03
Mn≤2.00≤2.00
P≤0.045≤0.045
S≤0.030≤0.030
Si≤0.75≤0.75
Ni8.0-11.08.0-12.0
Cr18.0-20.018.0-20.0
N≤0.10≤0.10
*Composition requirements for ASTM A240 Gr. 304 and 304L, %.

ElementCF8CF3
C≤0.08≤0.03
Mn≤1.50≤1.50
P≤0.040≤0.040
S≤0.040≤0.040
Si≤2.00≤2.00
Ni8.0-11.08.0-12.0
Cr18.0-21.017.0-21.0
Mo≤0.50≤0.50
*Composition requirements for ASTM A351 Gr. CF8 and CF3, %.

Mechanical Properties

Mechanical
Requirements
F304F304L
Tensile Strength,
min. MPa [ksi]
515 [75]485 [70]
Yield Strength,
min. MPa [ksi]
205 [30]170 [25]
Elongation in
2" min. %
3030
Reduction of
area, min. %
5050
*Tensile requirements for ASTM A182 Gr. F304 and F304L.

Mechanical
Requirements
TP304TP304L
Tensile Strength,
min. MPa [ksi]
515 [75]485 [70]
Yield Strength,
min. MPa [ksi]
205 [30]170 [25]
Elongation in
2" min. %
4040
Brinell Hardness
max. HBW
201201
Rockwell Hardness
Max. HRBW
9292
*Tensile & hardness requirements for ASTM A240 Gr. 304 and 304L.

ASTM A351CF8CF3
Tensile Strength,
min. MPa [ksi]
485 [70]485 [70]
Yield Strength,
min. MPa [ksi]
205 [30]205 [30]
Elongation in
2" min. %
3535
*Tensile requirements for ASTM A351 Gr. CF8 and CF3.

Manufacture & Heat Treatment

Stainless steel 304/ 304L flanges made of ASTM A182 F304/ F304L forgings shall be solution treated at the temperature no less than 1900°F [1040°C] with subsequent quenching treatment to cool it down to below 500°F [260°C] rapidly. SS 304/ 304L flanges made of ASTM A351 CF8/ CF3 castings shall be solution treated at the minimum temperature of 1900°F [1040°C] followed by a quench in water. Flanges without hub (blind, S/O plate) may be manufactured directly from stainless steel plates of ASTM A240 Gr. 304 or 304L, which shall be solution annealed.

Pressure-Temperature Ratings

Both ASME B16.5 and ASME B16.47 have consistently presented the pressure-temperature ratings for stainless 304/ 304L flanges in various material grades. Based on the pressure-temperature ratings, diverse stainless steel 304 and 304L flange materials can be classified into two groups: Group 2.1 – including ASTM A182 Gr. F304, ASTM A351 Gr. CF3 & CF8, ASTM A240 Gr.304; Group 2.3 – including ASTM A182 F304L, ASTM A240 Gr. 304L.

Temp.
°F
75#
psi
150#
psi
300#
psi
-20~100140275720
200115230600
300105205540
40095190495
50085170465
60070140440
65060125430
700-110420
750-95415
800-80405
850-65395
900-50390
950-35380
1000-20355
1050--325
1100--255
1150--205
1200--165
1250--135
1300--115
1350--95
1400--75
1450--60
1500--40
*Table A-1.

Temp.
°F
400#
psi
600#
psi
900#
psi
-20~10096014402160
20080012001800
30071510751615
4006609951490
5006209301395
6005908851325
6505758651295
7005658451265
7505508251240
8005408101215
8505307901190
9005207801165
9505107651145
10004707101065
1050435650975
1100345515770
1150275410615
1200220330495
1250180265400
1300150225340
1350125185280
1400100150225
145080115175
15005585125
*Table A-2.

Temp.
°F
1500#
psi
2500#
psi
-20~10036006000
20030005000
30026904480
40024854140
50023303880
60022103680
65021603600
70021103520
75020653440
80020303380
85019803300
90019453240
95019103180
100017702950
105016302715
110012852145
115010301715
12008251370
12506701115
1300565945
1350465770
1400380630
1450290485
1500205345
*Table A-3.

Temp.
°F
75#
psi
150#
psi
300#
psi
-20~100115230600
200100195510
30085175455
40080160420
50075150395
60070140370
65060125365
700-110360
750-95355
800-80345
850-65340
*Table B-1.

Temp.
°F
400#
psi
600#
psi
900#
psi
-20~10080012001800
20068010201535
3006109101370
4005608401260
5005257851180
6004957451115
6504857301095
7004807201080
7504707051060
8004606901035
8504506751015
*Table B-2.

Temp.
°F
1500#
psi
2500#
psi
-20~10030005000
20025554260
30022803800
40021003500
50019703280
60018603100
65018253040
70018003000
75017652940
80017302880
85016902820
*Table B-3.

Tables A-1, A-2 and A-3 list pressure-temperature ratings for Group 2.1 materials, which are the maximum allowable working gage pressures in psi units at the temperatures in degrees Fahrenheit. Tables B-1, B-2 and B-3 list pressure-temperature ratings for Group 2.3 materials, which are the maximum allowable working gage pressures in psi units at the temperatures in degrees Fahrenheit. Values of Class 75 through Class 900 are applicable to SS304/304L flanges of ASME B16.47 Series B; Values of Class 150 through Class 900 are applicable to SS304/ 304L flanges of ASME B16.47 Series B; Values of Class Class through Class 2500 are applicable to SS304/ 304L flanges of ASME B16.5.

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