ASTM A182 F316L Flange

QS Flange: Jiaxing ASTM A182 F316L Flange

A182 F316L forged weld neck flange in 1.4404, 3 inch Class 150LB raised face, with 0.035% maximum carbon for welded joints that resist intergranular attack.

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One-Minute Overview

Forged weld neck flange in A182 F316L, the 1.4404 low-carbon grade, 3 inch Class 150LB.
Carbon held to 0.035 percent maximum, so welds resist intergranular corrosion.
Molybdenum at 2.00 to 3.00 percent handles chlorides in marine and chemical duty.
Raised face seats the gasket; ASME B16.5 rating reaches 230 psig at moderate temperature.

The ASTM A182 F316L flange is a forged weld neck body in W.Nr.1.4404, the low-carbon grade also listed as UNS S31603. It is 3 inch and Class 150LB, with a raised face and a hub that transitions into the pipe. The low carbon is the point of the grade: it keeps carbide precipitation away from the weld, which matters on heavy-gauge joints.

Name: ASTM A182 F316L Flange
Size: 3 Inch
Pressure: Class 150LB
Material: W.Nr.1.4404 (F316L)
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

F316L holds carbon to 0.035 percent maximum. That ceiling is what stops chromium carbides forming at the grain boundaries during welding, and it is why the grade is chosen for welded assemblies where intergranular corrosion would otherwise shorten service life. The molybdenum level of 2.00 to 3.00 percent covers pitting and crevice corrosion in chloride-rich media, which puts marine, chemical and petrochemical duty inside its range. The weld neck hub adds stiffness and smooths the stress path at the joint.

According to the ASME B16.5 pressure-temperature ratings, a Class 150LB F316L flange carries working pressure up to 230 psig between -29°C and 38°C, and the allowable falls as temperature climbs — so read the rating at your operating temperature, not at ambient. For installation, match the raised face to the mating flange, fit a gasket suited to the medium, and tighten in stages. Oil and gas lines, chemical and petrochemical processing, and sanitary duty in pharmaceutical or food plants are the usual applications.

FAQ

Q1. Why F316L rather than F316 for a welded joint?

F316L caps carbon at 0.035 percent, and that limit is what keeps chromium carbides from forming at grain boundaries during welding. F316 has more carbon and more strength, but on heavy-gauge welds the low-carbon grade is the safer choice against intergranular corrosion. If the joint will be welded and cannot be solution annealed afterwards, F316L is usually the answer.

Q2. 230 psig at 38°C — what happens at 200°C?

The allowable pressure drops. ASME B16.5 pressure-temperature tables reduce the rating as temperature rises, so 230 psig is the ceiling at the low end of the range, between -29°C and 38°C. Always read the table at your design temperature, and remember the gasket and the bolting have their own limits.

Q3. Is it clean enough for pharmaceutical or food lines?

The page lists pharmaceutical and food processing among its applications, where corrosion resistance and hygienic standards matter. The raised face and the forged body give a sound joint, and F316L resists the cleaning media usually found in those plants. Confirm surface finish and any documentation you need when you enquire, since those are specified per order.

Q4. How long will production take?

Standard sizes are typically ready within 30 days, and in-stock items ship immediately. Larger or custom orders get a confirmed date per order, because the schedule depends on quantity, material, the bolt pattern you specify, and how busy production is at the moment you order.

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