What is Stainless Steel 304/304L/304H Flanges ?
Stainless steel is considered as the strongest and most recommended material for the manufacturing of commercial as well as household alloys. Stainless steel has unique properties and characteristics that differs it from other alloys. Stainless steel 304 flanges are highly efficient and effective. These flanges are commonly used for industrial and plumbing purposes.
Flanges are generally used for creating permanent or temporary joints between two pipes in order to transfer material or fluids from one place to another. These flanges are used for long term purposes hence the quality and durability is the most prioritized considered feature. Grade 304L is the most demanded grade in all types of industries. Stainless steel 304H flanges are highly ductile and strong. These flanges are made of excellent quality raw material and alloys.

Stainless Steel 304H Threaded Fitting, SS 304H Threaded Pipe Elbow, 304H Stainless Steel Forged Threaded 90deg. Elbow, SS 304H Threaded Fittings, SS UNS S30400 Threaded Bushing, Stainless Steel 304H Threaded Cap, SS 304H Screwed Fittings Supplier in Mumbai, India.
Grade 304L flanges are made of excellent combinations. The chemical composition of this grade includes manganese, nickel, and chromium. The composition also includes some amount of silicon, carbon and phosphorus. These flanges are enriched with extraordinary properties. Grade 304H flanges are capable of tolerating high heat and bad weather conditions.
Stainless steel 304L flanges are enriched with high tensile and yield strength. We at Sumit impex make sure that our product is thoroughly tested and certified. We do multiple tests on all of our products to be sure about the quality of the product.
Stainless Steel 304 Series Flanges Specifications
Specifications | : | ASTM A182 / ASME SA182 |
Size | : | 1/2″ (15 NB) to 48″ (1200NB) |
Standards |
: | ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc. |
Class / Pressure | : | 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc. |
Standard | : | ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc. |
STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
SS 304 | 1.4301 | S30400 | SUS 304 | 304S31 | 08Х18Н10 | Z7CN18‐09 | X5CrNi18-10 |
SS 304L | 1.4306 / 1.4307 | S30403 | SUS 304L | 3304S11 | 03Х18Н11 | Z3CN18‐10 | X2CrNi18-9 / X2CrNi19-11 |
SS 304H | 1.4301 | S30409 | – | – | – | – | – |
Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N |
SS 304 | 0.08 max | 2 max | 0.75 max | 0.045 max | 0.030 max | 18 – 20 | – | 8 – 11 | – |
SS 304L | 0.035 max | 2 max | 1.0 max | 0.045 max | 0.030 max | 18 – 20 | – | 8 – 13 | – |
SS 304H | 0.10 max | 2 max | 0.75 max | 0.045 max | 0.030 max | 18 – 20 | – | 8 – 10.5 | – |
Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
8.0 g/cm3 | 1400 °C (2550 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35 % |
SS 304/304L | ||||||
---|---|---|---|---|---|---|
Density lbm/in3 |
Thermal Conductivity (BTU/h ft. °F) |
Electrical Resistivity (in x 10-6) |
Modulus of Elasticity (psi x 106 |
Coefficient of Thermal Expansion (in/in)/ °F x 10-6 |
Specific Heat (BTU/lb/ °F) |
Melting Range (°F) |
at 68°F: 0.285 | 9.4 at 212°F | 28.3 at 68°F | 28 | 9.4 at 32 – 212°F | 0.1200 at 68°F to 212°F | 2500 to 2590 |
12.4 at 932 °F | 39.4 at 752°F | 10.2 at 32 – 1000°F | ||||
49.6 at 1652 °F | 10.4 at 32 – 1500°F | |||||
SS 304H | ||||||
Denstiy lbm/in3 |
Coefficient of Thermal Expansion (min/in)-°F |
Thermal Conductivity BTU/hr-ft-°F | Specific Heat BTU/lbm -°F | Modules of Elasticity (annealed)2-psi | ||
at 68 °F | at 68 – 212°F | at 68 – 1600°F | at 212°F | at 932°F | at 32 – 212°F | in tension (E) |
0.285 | 9.2 | 11.0 | 9.4 | 12.4 | 0.12 | 29 x 106 |

Other Products
SS 304 SORF Flanges | ASTM A182 SS 304 WNRF Flanges |
SS 304 Blind Flanges | SUS 304 Spacer Ring Flanges |
UNS S30400 Ring Type Joint Flanges | SS 304 Nipolet Flanges |
SS 304 Nipo Flange | SS 304 Long weld Neck Flanges |
304 Stainless Steel Pipe Flanges | UNS S30400 Nipolet Flanges |
WNR. 1.4301 Flat Flange | SS 304 Lap Joint Flanges |
Stainless Steel 304 Series Flanges Price List
- 304 stainless steel bars
US $1000-2500 / Ton - ASTM A182 SS 304L rods
US $2000-3000 / Ton - Stainless Steel hex bar 304H
US $1.5-4.5 / Kilogram - ASTM A182 304 stainless steel round bar
US $1800-2300 / Ton - SS 304L square bar
US $1550-2400 / Ton - 304H stainless steel bar manufacturer
US $1800-2300 / Ton - ASTM A182 Gr. 304 rods
US $1300-2600 / Metric Ton

Different Types of Stainless Steel Grade 304 series Flanges

- SS 304 Grade Reducing Flanges
- ASTM A182 Reducing Flange
- ASME SA182 Reducing Flange
- UNS S30400 Reducing Flange
- WNR 1.4301 Reducing Flange

- SS 304L Ring Joint Flange
- ASTM A182 Ring Joint Flange
- ASME SA182 Ring Joint Flange
- UNS S30403 Ring Joint Flange
- WNR 1.4306 Ring Joint Flange

- SS 304H Grade Screw Flanges
- ASTM A182 Screw Flanges
- ASME SA182 Screw Flange
- UNS S30409 Screw Flange
- WNR 1.4307 Screw Flange
Packaging
We Sumit Impex Metal Ensure the Best Quality of Packing, Because It Plays an Important Role Especially in the Case of International Shipments in Which Consignment Passes Through Various Channels to Reach the Ultimate Destination, So We Put Extraordinary Concern Regarding Packaging.
We pack our goods in numerous ways based on the products. We pack our products in multiple ways, such as,
- Boxes and Crates
- Shrink-wrapped
- Carton boxes
- Wooden pallets
- Wooden boxes
- Wooden crates

Testings (Destructive, Non Destructive)
- Mechanical Testing Such as Tensile, Elongation, Reduction of Area
- Sulfide Stress Corrosion Cracking (SSC), NACE TM 0177
- Hydrogen-Induced Cracking (HIC) Test, NACE TM0284
- Positive Material Identification – PMI Testing
- Chemical Analysis – Spectro Analysis
- Intergranular Corrosion (IGC) Test
- Pitting Resistance Test
- Dye Penetrant Test (DP Test)
- Micro Test
- Macro Test
- Hardness Test
- Flaring Test
- Flattening Test
- Hydrostatic Test
- Radiography Test
- Ultra Sonic Test (UT)
- Eddy Current Testing
- Impact Test
- Bend Test

Application Industries
These material are not a single material but the name for a family of corrosion resistant steels. Like many scientific breakthrough the origins of stainless steel lies in a lucky accident. From the smallest part of zipper to the largest building skyscraper, stainless steel is an essential part of modern life.Stainless steel’s strength, resistance to corrosion and low maintenance make it the ideal material for a wide range of applications. It is also has a long life cycle and is 100% recyclable.
- Construction
- Bridges
- Petrochemical Industry
- Ship Building
- Engineering
- General Structural Purposes
- Offshore and Onshore Services

Stainless Steel 304 Series Flanges Manufacturers












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