STAINLESS STEEL FLANGE - 304/304L (UNS S30400/S30403)

Description                                                     

304 stainless is a low-carbon (0.08% max) version of the basic 18-8, also known as 302. Type 302 has 18% chromium and 8% nickel. Type 304 has a slightly lower strength than 302 due to its lower carbon content. Type 304 is used in welding applications, because the low carbon permits some exposure in the carbide precipitation range of 800° F -1500° F without the need for post-annealing operations. However the severity of the corrosive environments may necessitate annealing after welding or the use of 304L. Type 304L has a carbon content of 0.03% or less.

Steel pipe flanges are classified as per ASME B16.5 standard. The pressure rating of flange ranges from 150# to 2500#. The term "lb", "class" and "#" are used interchangeably to designate the pressure rating of the flange. The fact is that 150 lb has no relation to 150 psi and so does the 300 or 600 lb does not correlate to 300 or 600 psi pressure rating. Pressure rating of the flange depends on the material (A105, stainless, nickel alloy etc.), the heat treat condition and pressure "class". Here we will use the term "class" to NOT confuse it with pressure "rating". So what is class 150 flange or ASME B16.5 class 150 flange, as the question raised by many customers.

ANSI 16.5 / ASME B16.5 Flange Specification

ASME B16.5 pipe flange and flanged fittings cover sizes from 1/2" nominal to 24" nominal. The standard covers pressure, temperature, material, tolerance, dimension, testing and marking of flange. The pressure classed included in ASME B16.5 are 150#, 300#, 600#, 900# and 1500# for sizes up to 10" nominal and 2500# for sizes 12" through 24".

ASME B16.47 Series A and Series B Flange Specification

ASME B16.47 covers large diameter steel flanges from 26" nominal to 60" nominal pipe sizes. There are two types of B16.47 flanges, Series A and Series B. Both have slightly different dimensions such as thickness, bolt circle diameter and number of bolt holes. Pressure class covered by B16.47 is Class 75, 150, 300, 400, 600 and 900#. Standard covers flanges made of cast, forged or plate material (for blind flange only)

Specifications   

ASTM:   A312, A376, A358, A269, A249, A403, A182, A351            

ASME:   SA312, SA376, SA358, SA269, SA249, SA403, SA182, SA351          

Chemical Composition%

Tensile Requirements                                 

Tensile Strength:  (KSI) = 70                                                                   

Yield Strength:  (KSI) = 25                                          

(KSI converts to MPA {Megapascals} by multiplying by 6.895)                                                                   

Typical Application                                                     

§  Sanitary systems

§  Dairy and food processing

§  Heat exchangers, evaporators

§  Feed water heaters  

TYPES OF 304 / 304L FLANGES

Other grade of Stainless steel  Flanges

Stainless  Flange 304 Grade,  Stainless  Flange  304L Grade, Stainless  Flange  304H Grade, Stainless  Flange 309S Grade, Stainless  Flange  309H Grade, Stainless  Flange  310S Grade, Stainless  Flange  310H Grade, Stainless  Flange  316 Grade , Stainless  Flange  316H Grade, Stainless  Flange  316L Grade, Stainless  Flange  316 TI Grade, Stainless  Flange  317 Grade, Stainless  Flange  317L Grade, Stainless  Flange  321 Grade, Stainless  Flange  321H Grade, Stainless  Flange  347 Grade, Stainless  Flange  347 H Grade, Stainless  Flange  409 Grade, Stainless  Flange  410 Grade, Stainless  Flange  410S Grade,

HASTEALLOYS  Flange  ,  Inconel  Flange  , Monel  Flange.

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