ASTM A182 F316 Flange

QS Flange: Huaian ASTM A182 F316 Flange

A182 F316 forged weld neck flange, 2 inch Class 150LB raised face to ASME B16.5, with 2-3% molybdenum for chloride and seawater service.

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One-Minute Overview

Forged weld neck flange in A182 F316 stainless steel, 2 inch, Class 150LB, raised face.
Molybdenum at 2 to 3 percent resists pitting and crevice corrosion in chloride service.
Tapered hub reinforces the pipe junction and reduces stress concentration at the weld.
Forged grain structure keeps strength and toughness from cryogenic levels up to 538°C.

The ASTM A182 F316 flange takes a 2 inch line into a Class 150LB joint on equipment, a valve or a header. It is a weld neck body with a raised face, dimensioned to ASME B16.5 so it mates with standard flanges of the same size and class. The molybdenum-bearing austenitic steel is the reason this grade gets picked where chlorides are present.

Name: ASTM A182 F316 Flange
Size: 2 Inch
Pressure: 150LB
Material: F316
Type: WN
Flange Face: RF
Process Method: Forged
Feature: Strong Stiffness, Good Sealing, Corrosion Resistance
Usage: High Temperature, High Pressure and High Sealing Requirements
Standard: ASME B16.5

The tapered hub adds thickness where the pipe meets the flange, so stress concentrates less at the weld and the joint keeps its shape under pressure. Forging refines the grain structure, which pays off as tensile strength, toughness and resistance to thermal fatigue — the properties that decide how a flange behaves through repeated heat-up and cool-down. F316 carries 2 to 3 percent molybdenum, enough to hold pitting and crevice corrosion back in chloride-bearing media where 304 would struggle, and it keeps mechanical properties in continuous service up to 538°C with toughness retained down to cryogenic temperatures.

Choose the gasket for the raised face and for the medium, bolt with studs of the matching class, and tighten in a star pattern in stages until the gasket has seated evenly. The face type on the mating flange has to agree, and the line design fixes the rest. Chemical processing, offshore work and chloride-bearing water systems are the usual homes for this grade; the 2 inch Class 150LB size suits smaller branch connections and equipment nozzles.

FAQ

Q1. What does the molybdenum actually buy me in F316?

It is the alloy's answer to chlorides. At 2 to 3 percent, molybdenum raises resistance to pitting and crevice corrosion, so the flange holds up in seawater, brine and many chemical streams where standard 304 would start to pit. The improvement is not cosmetic: it is the difference between scheduled inspection and unplanned replacement.

Q2. Is a forged weld neck overkill for a 2 inch line?

Not if the line runs hot, cycles, or carries chlorides. Forging refines the grain structure and gives the body consistent strength, while the tapered hub spreads stress away from the weld. On a small branch it is cheap insurance: the part is modest in size, but a leak at a nozzle is never modest in cost.

Q3. How cold, or how hot, can this flange go?

The page data puts continuous service up to 538°C, with toughness retained down to cryogenic temperatures around -196°C. Between those ends the pressure rating follows the ASME B16.5 tables, so check the rating at your actual temperature rather than at ambient. If your duty sits near either limit, confirm it with us before ordering.

Q4. What is the smallest order I can place?

Standard flange insulation gasket kits start at one set, and standard gaskets, studs, washers and sleeves start at one piece. Parts made to your drawing or to a non-standard bolt pattern are quoted one by one, because the minimum really depends on the material and the tooling involved.

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