Stainless Steel 304 Flanges

Hot worked ss specified ASTM a182 f304 flange has been designed with the intension of being used in high temperature settings. Generally, those SS grades that are to be used at elevated temperature have a controlled carbon content in their alloys.

Stainless Steel 304 Flanges

This is the case for SS 304 Flange as well. The typical content of carbon in 304 is about 0.08%. But in the case of this modified carbon controlled alloy, which can also be referred to as 304H, the carbon content is in a range between a minimum of 0.04% to a maximum of 0.08%. Controlling the chemistry of carbon in the alloy of SS 304 plate flange ensures that the alloy maintains its higher tensile strength and can be used up to a temperature of 1500°F.

An upside to using the UNS S30400 flange is that if required to be used at elevated temperature settings, the chemistry of the alloy can be modified to meet its requirement, yet the alloy can be dual certified as 304/304H. A dual certified alloy makes perfect sense if required to be produced as specified ASME sa 182 f304 pipe flange. Being a leading 304 ss flange manufacturer in India, we recommend using a hot working procedure where annealing is performed on the alloy at a temperature of 1900°F. The recommendation serves its purpose when our clients note that the alloy has superior resistance to corrosion when annealing is performed at that temperature. In fact, the corrosion resistance is a property which can be optimised by following rapid cooling by any method or by water quenching the f304 blind flange between a working temperature range of about 1652°F – 2102°F.


Equivalent material grade of Stainless Steel 304 Flanges

Stainless Steel 304 Flanges 1.4301 S30400 SUS 304 304S31 08Х18Н10 X5CrNi18-10

ASTM A182 F304 Flanges specification chart

Stainless Steel 304 Flange size range 1/2Inch (15 NB) to 48 Inch(1200NB)
ASTM A182 304 Blind Flange ANSI Standard Class 150, 300, 600, 900, 1500, 2500 LBS
SS 304 Flange DIN Standard 6 to 40 Bar / PN 6 To Pn 64
SS 304 Blind Flange JIS Standard 5, 10, 16, 20, 30, 40, 63 K

Available Stock of SS F304 Slip On Flanges

SS Flange
  • Ss 304 Flange
  • ASTM A182 F304 Flanges
  • 304 SS Material
Stainless-steel flange
  • 304 Stainless Steel Flange
  • SS 304 Blind Flange
  • SS 304 Flange

Chemical Material Composition of 304 Stainless Steel Flanges

Grade Carbon (C) Manganese (Mn) Silicon (Si) Phosphorus (P) sulphur (S) Chromium (Cr) Molybdenum (Mo) Nickel (Ni) Nitrogen (N)
SS 304 flange 0.08 Maximum 2 Maximum 0.75 Maximum 0.045 Maximum 0.030 Maximum 18 – 20 - 8 – 11 -

SS 304 Blind Flange Mechanical Strength Table

Density Melting Point Tensile Strength High Yield Strength Elongation
8.0 gram/cm3 1400 °C PSi 75000 PSi 30000 35 %

SS 304 flange specification for oil and gas industry

Austenitic alloy 304 is the most widely used and most popular grade amongst stainless steel Conventionally referred to as 18/8 stainless, these flanges exhibit certain levels of characteristics such as mechanical strength, resistance to both corrosion and oxidation. These characteristics make grade 304 flanges an agreeable grade to be used in the oil and gas industry, that too at a more economical price.

Flanges used in the oil and gas industry, especially those components in the drilling & processing units are expected to perform in a certain manner, which is why bodies like the ASTM and ANSI have created a set of standards, which are known as specifications to manufacture these components. These specifications act as a guideline for the manufacturer in order to create flanges that not only optimise the performance of the application, but also cater to the suitability and the longevity of the said product. As far as specifications are concerned ANSI/ASME 16.5, ASME B16.47 A & B, as well as ASTM A182, are very common in the oil and gas industry. For instance, ASTM A182 covers the chemistry, mechanical property in addition to the heat processing of these high temperature application 304 flanges.

In the case of ASME B16.47 A & B series, flanges which have a larger diameter are produced under this specification i.e. from NPS 26 to NPS 60. The grade 304 ASME B16.47 A flanges tend to be much thicker, heavier, stronger and expensive in comparison to series B of the same specification. On the other hand, Stainless steel grade 304 flanges belonging to specification ANSI/ASME 16.5 are produced within a range of NPS 1/2 through NPS 24 and are designated in the pressure class range of 150 to class 2500. The details for producing ANSI/ASME specified flanges, delves into more details with regards to the dimensions, tolerances, marking, and testing for pipe flanges. Apart from the pressure & temperature ratings, these specifications also consider the materials used, which in this instance is stainless steel grade 304.