The customer specifically requested that all flanges undergo solution annealing—a critical step for enhancing corrosion resistance and ensuring uniform mechanical properties.

At ZIZI, we understand the importance of heat treatment in stainless steel products. Our production team strictly adheres to ASME B16.5 standards and performs solution annealing to ensure superior performance, a smooth surface finish, and durability in harsh environments. Every flange we deliver reflects our commitment to quality, precision, and customer satisfaction.

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Inspection photos

ASME B16.5 Class 300 Weld Neck Flange

An Class 300 ASME B16.5 Weld Neck Flange is a type of high-pressure pipe flange designed to connect piping systems securely and withstand elevated temperatures and pressures.
The “Weld Neck” design features a long tapered hub that provides reinforcement at the weld area, reducing stress concentration and ensuring excellent structural integrity.

This flange type is commonly used in oil & gas, petrochemical, power generation, and offshore industries, where reliable and leak-free connections are critical.

Specification of ASME B16.5 Weld Neck Flanges

ASTM A182 F316 Forged Flange Chemical Composition

ASTM A182 F316 Forged Flange Mechanical Property

Class 300lb Weld Neck Flange Dimensions & Weight

Solution Treatment of Flanges

Solution treatment (or solution annealing) of flanges is a key heat treatment process used to improve the properties of certain materials (especially stainless steel and nickel-based alloy flanges), particularly corrosion resistance and machinability.

Which flanges require solution treatment?

Not all flanges require solution treatment; primarily stainless steel flanges, such as:

Austenitic stainless steel flanges such as 304, 304L, 316, 316L, 321, and 347

Special corrosion-resistant alloy flanges (such as Inconel, Duplex, and Hastelloy)

Note : A solution annealing temperature above 1950 °F [1065 °C] may impair the resistance to intergranular corrosion after subsequent exposure to sensitizing conditions in F 321, F 321H, F 347, F 347H, F 348, and F 348H. When specified by the purchaser, a lower temperature stabilization or resolution annealing shall be used subsequent to the initial high temperature solution anneal (see Supplementary Requirement S10)

SS316 Weld Neck Flange Benefits

High Pressure & Temperature Resistance
Excellent Leak Prevention
Enhanced Durability
Versatile Applications

Applications

Oil & Gas Pipelines

Petrochemical Processing Plants

Power Generation Systems

Water Treatment Facilities

High-Pressure Steam Lines

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ASTM A350 LF2 Flanges is a method of connecting pipes, valves, pumps and other equipment to form a piping system. It also provides easy access for cleaning, inspection or modification. Flanges are usually welded or screwed. Flanged joints are made by bolting together two flanges with a gasket between them to provide a seal.ASTM A350 LF2 Flanges (Standard Specification for Carbon and Low-Alloy Steel Forgings, Requiring Notch Toughness Testing for Piping Components)

ASTM A350 LF2 Flange Material Equivalent

ASTM A350 LF2 flange material is a low temperature carbon steel forging material, commonly used to manufacture pipes, pipe fittings and valves that work in low temperature environments. It has good strength and toughness, especially at low temperatures, it can maintain good mechanical properties to prevent brittle fracture and other failure forms.

Equivalent grades of ASTM A350 LF2 are as follows:

A350 LF2 Flange Material of Chemical Composition

The carbon content in A350 LF2 is usually limited to a certain range, generally not exceeding 0.30%. Carbon is an important element that affects the strength and hardness of steel. The right amount of carbon can increase the strength of steel, but if the carbon content is too high, it will reduce the toughness of the steel, especially in low temperature environments, high carbon content may cause the steel to become brittle.

A350 LF2 Flange Material of Mechanical Property

Yield strength is the stress at which steel begins to deform plastically. This is important to ensure that the steel does not deform excessively when subjected to load.

Learn more about A350M Standard

This specification covers several grades of carbon and low-alloy steel forged or ring-rolled flanges, forged fittings and valves intended primarily for low-temperature service and requiring notch toughness testing. They are made to specified dimensions, or to dimensional standards, such as the ASME and API Specifications referenced in Section 2. Although this specification covers some piping components machined from rolled bar and seamless tubular materials, it does not cover raw material produced in these product forms.

Impact Test Temperature

Test Specimens by 10mm x 10mm

Impact test values: Charpy V-Notch Energy Requirements for specimens 10mm by 10mm.

Low Temperature Carbon Steel Flange types

Blind Flange

A blind flange is a solid flange with no holes in the middle. It is mainly used to close the end of a pipe or to cut off a pipe system. A350 blind flanges are manufactured according to the A350 standard and usually consist of a circular flange with bolt holes around the perimeter.

Lap Joint Flange

The lap joint flange consists of a flange and a collar. The collar is put on the pipe, and the flange and the collar are connected by bolts. The structure of the A350 lap joint flange allows a certain amount of space between the pipe and the flange, which can adapt to the thermal expansion and contraction of the pipe.

Slip On Flange

Slip on flange is to weld the flange directly to the pipe, and the welding part is the inner hole edge of the flange and the outer periphery of the pipe. The welding process of A350 slip on flange is relatively simple, and usually does not require a complex welding process like butt welding flange.

Socket Weld Flange

One end of the socket flange is a socket, and the pipe is connected after being inserted into the socket. The socket size of the A350 socket flange is determined according to the A350 standard, including the depth, inner diameter and other parameters of the socket.

Threaded Flange

The inner hole or outer circumference of the threaded flange is threaded, and it is connected to the pipe through the thread. The thread specifications of the A350 threaded flange conform to the A350 standard. When connecting, screw the pipe with the corresponding thread into the threaded hole of the flange, and use the self-locking characteristics of the thread to achieve the connection.

Weld Neck Flange

The neck of the weld neck flange is connected to the pipe by butt welding. Its structural feature is a longer neck, which makes the connection between the flange and the pipe more secure and can withstand higher pressure and temperature.

Advantages of A350 LF2 Material

Good Low Temperature Performance

A350 LF2 flange material has excellent toughness in low temperature environments. Its chemical composition and micro structure have been optimized to effectively resist brittle fracture at low temperatures.

Good Weldability

A350 LF2 has good weldability and can adapt to a variety of common welding processes. Due to the characteristics of its chemical composition, A350 LF2 can form a welded joint with relatively stable quality after welding.

Balanced Mechanical Properties

A350 LF2 has achieved a good balance between strength and toughness. Its yield strength and tensile strength can meet the load-bearing requirements of many engineering structures, while having sufficient toughness to prevent sudden brittle failure during use.

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Hastelloy C276 is an alloy that stands out because of its distinctive blend of elements: nickel, molybdenum, and chromium primarily, with traces of iron, tungsten, cobalt, and other elements. This blend gives the Hastelloy C276 remarkable characteristics, extending these qualities to the flanges crafted from it.

Specifications Of Hastelloy C276 Flanges

ASTM B564 Hastelloy C276 Chemical Composition

Hastelloy C276 flange is a nickel-molybdenum-chromium alloy. The presence of molybdenum gives the alloy excellent resistance to reducing acid corrosion, while the chromium element helps to improve the alloy’s oxidation resistance and corrosion resistance, especially in oxidizing environments.

ASTM B564 Hastelloy C276 Mechanical Properties

Hastelloy C276 flanges has good strength and toughness. Its mechanical properties such as yield strength and tensile strength can meet the requirements of various harsh engineering conditions.

Equivalent Grades of Hastelloy C276 Flanges

Hastelloy C276 Flanges Dimension

Differences between Hastelloy C22 and C276 Flange

Differences in Chemical Composition

Hastelloy C276 flanges has a chromium content of 14.5 – 16.5%. Compared with Hastelloy C22 flange, the chromium content is slightly lower. The molybdenum content is 15 – 17%. The molybdenum content is slightly higher than that of C22, which may make C276 have better corrosion resistance in some reducing corrosion environments. The tungsten content is 3 – 4.5%. Its tungsten content is also slightly higher than that of C22, which has a certain impact on high temperature performance and corrosion resistance.

Different Corrosion Resistance

In a strong oxidizing acid environment, due to its higher chromium content, C22 flange can form a more stable chromium oxide protective film and show better corrosion resistance.

In some complex environments containing a mixture of oxidizing and reducing media, Hastelloy C276 flange has better comprehensive corrosion resistance.

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