ASTM A182 Gr F304 Stainless Steel Flange
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If you are looking for ASTM A182 Gr F304 stainless steel flanges, Gnee Stainless Steel offers premium-grade forged flanges that combine strength, durability, and excellent corrosion resistance. Designed to meet ASTM A182 / ASME SA182 standards, these flanges are ideal for pressure piping systems, chemical processing, oil & gas, food industries, and marine applications.
Gnee provides a complete range of F304 stainless steel flange types, including Slip-On, Weld Neck, Blind, Socket Weld, Threaded, and Lap Joint flanges, with precise machining and surface finish that ensure tight sealing and long service life.
What is ASTM A182 Gr F304 stainless steel?
ASTM A182 Gr F304 refers to forged austenitic stainless steel flanges manufactured according to ASTM A182 standards.The grade F304 has a chemical composition equivalent to AISI 304 stainless steel, containing approximately 18% chromium and 8% nickel, offering excellent corrosion resistance, good mechanical strength, and weldability.These flanges are commonly used in pressure piping systems, chemical plants, and food processing industries.
Product Name: ASTM A182 Gr F304 Stainless Steel Flange
Material Grade: AISI 304 / EN 1.4301 / UNS S30400
Standard: ASTM A182 / ASME SA182
Manufacturing Process: Forged and Machined
Pressure Class: Class 150, 300, 600, 900, 1500, 2500
Connection Type: Slip-On (SO), Weld Neck (WN), Blind (BL), Threaded (TH), Socket Weld (SW), Lap Joint (LJ)
Surface Finish: Smooth, Serrated, or Polished Face (RF / FF / RTJ)
Certification: ISO 9001, PED, EN 10204 3.1 / 3.2
Stainless steel ASTM A182 F304 Mechanical Properties
| Property | ASTM A182 Gr F304 Stainless Steel |
|---|---|
| Density | 7.93 g/cm³ |
| Tensile Strength | 515–750 MPa |
| Yield Strength (0.2%) | ≥ 205 MPa |
| Elongation | ≥ 40% |
| Hardness (HB) | ≤ 187 HB |
| Melting Point | 1400–1450°C |
| Corrosion Resistance | Excellent in water, steam, acids, and mild chlorides |
| Max Service Temperature | Up to 870°C (intermittent), 925°C (continuous) |
A182 Gr 304 stainless steel flange pressure rating
| ASA / ANSI /ASME B16.34 | ANSI PRESSURE RATING CHART | ||||||
|---|---|---|---|---|---|---|---|
| °F Temperature | 150 LBS | 300 LBS | 400 LBS | 600 LBS | 900 LBS | 1500 LBS | 2500 LBS |
| -20 to 100 | 275 | 720 | 960 | 1440 | 2160 | 3600 | 6000 |
| 200 | 230 | 600 | 800 | 1200 | 1800 | 3000 | 5000 |
| 300 | 205 | 540 | 720 | 1080 | 1620 | 2700 | 4500 |
| 400 | 190 | 495 | 660 | 995 | 1490 | 2485 | 4140 |
| 500 | 170 | 465 | 620 | 930 | 1395 | 2330 | 3880 |
| 600 | 140 | 435 | 580 | 875 | 1310 | 2185 | 3640 |
| 650 | 125 | 430 | 575 | 860 | 1290 | 2150 | 3580 |
| 700 | 110 | 425 | 565 | 850 | 1275 | 2125 | 3540 |
| 750 | 95 | 415 | 555 | 830 | 1245 | 2075 | 3460 |
| 800 | 80 | 405 | 540 | 805 | 1210 | 2015 | 3360 |
| 850 | 65 | 395 | 530 | 790 | 1190 | 1980 | 3300 |
| 900 | 50 | 390 | 520 | 780 | 1165 | 1945 | 3240 |
| 950 | 35 | 380 | 510 | 765 | 1145 | 1910 | 3180 |
| 1000 | 20 | 320 | 430 | 640 | 965 | 1605 | 2675 |
What's the difference between F304 and F304L?
F304L contains lower carbon content (≤0.03%) than F304 (≤0.08%), offering better weldability and reduced carbide precipitation during welding.
| Property | ASTM A182 F304 | ASTM A182 F304L |
|---|---|---|
| Carbon Content | ≤0.08% | ≤0.03% |
| Weldability | Good | Excellent |
| Resistance to Intergranular Corrosion | Moderate | High |
| Post-weld Heat Treatment | May be required | Not required |
| Typical Use | General service | Heavily welded systems or low-temperature service |
What pressure classes do F304 flanges cover?
Gnee supplies F304 flanges in Class 150 to Class 2500, compliant with ASME B16.5 / B16.47 standards.
Which standards and dimensions does ASTM A182 F304 Flange comply with?
These flanges are manufactured according to international standards such as:
ASME B16.5 – Pipe flanges (1/2" to 24")
ASME B16.47 Series A/B – Large diameter flanges (26" to 60")
DIN / EN 1092-1 / JIS / GB / GOST – Available upon request
ASTM A182 Gr F304 Flange Price (2025 Reference)
| Flange Type | Pressure Class | Size Range (inch) | Price Range (USD/piece)* |
|---|---|---|---|
| Slip-On (SO) | 150 | 1/2" – 12" | $4.00 – $25.00 |
| Weld Neck (WN) | 300 | 1/2" – 24" | $10.00 – $80.00 |
| Blind (BL) | 600 | 1" – 16" | $8.00 – $65.00 |
| Socket Weld (SW) | 150 | 1/2" – 6" | $5.00 – $18.00 |
| Threaded (TH) | 150 | 1/2" – 4" | $4.00 – $15.00 |
*Price varies depending on size, standard, and surface finish (FOB China).Email: info@gneestainless.com
GNEE supplies forged flanges conforming to ASTM A182 standards, in materials including F304 (carbon content ≤0.08%) and F304L (carbon content ≤0.03%) – these two low-carbon and ultra-low-carbon austenitic stainless steels offer excellent corrosion resistance, superior low-temperature toughness, and good weldability. These flanges are designed for piping systems in industries such as chemical, oil and gas, food production, and construction, where resistance to intergranular corrosion is crucial.
ASTM A182 F304 flanges are manufactured using rigorous forging, heat treatment (solution annealing), and precision machining processes, resulting in high-quality surface finishes, tight dimensional accuracy (tolerances within standard ranges), and are available in a variety of standard sizes (e.g., ANSI B16.5, DIN, JIS) and pressure ratings (150-2500). Custom non-standard sizes are also available upon request. Each flange comes with a Material Testing Certificate (MTC), a non-destructive testing report (e.g., radiographic/ultrasonic testing), and third-party certification (e.g., SGS) to ensure compliance with international standards and reliable long-term performance under high temperature, high pressure, and corrosive media conditions.
