321 stainless steel strips for metal bellows guide

321 Stainless Steel Strips For Metal Bellows: Ultimate Guide

Grade 321 stainless steel strips are widely used for metal bellows production.

Metal bellows are very common in several manufacturing fields across different industries. The metal bellows plays a crucial role in sealing sensing applications.

321 stainless steel strip is a Ni-Cr-Mo austenitic stainless steel material, its performance is very similar to 304 stainless steel strip.

But due to the addition of alloy titanium content, it has better resistance to grain boundary corrosion and high temperature strength. It effectively controls the formation of chromium carbide.

In this article, we will be expounding on 321 stainless steel strips for metal bellows, its production process and application.

Let’s keep reading.

321 stainless steel strips refers to an austenitic stainless steel.

321 austenitic stainless steel strip has good corrosion resistance in the atmosphere and is widely used in petrochemical, electric power, bridge and automobile industries.

However, the “stainlessness” of 321 stainless steel is not absolute. Due to the special service environment, 321 stainless steel will also corrode.

Factors such as medium concentration, PH value, and temperature will have a greater impact on the corrosion resistance of 321 stainless steel.

The stainless steel 321 strips are capable of retaining oxidation to 816 degrees C and come with stress rupture and higher creep qualities when compared to the stainless steel 304 and stainless steel 304L. Stainless steel 321 strips is also capable of retaining a great low temperature longevity.

It is possible to weld and process the stainless steel 321 strip using standard fabrication practices.

What Is 321 Stainless Steel Metal Bellow?

Stainless steel metal bellow refers to wave shaped tubes also referred to as expansion joints.

They can be extended of compressed whenever pressure is applied to on the outer part of the pipe.

Metal bellows will always revert to their initial shape whenever pressure is released and materials are yet to be stressed past the yield strength.

Metal bellows are in most cases used for the axial non-concentric transmission with irregular turning, slight bending radius or thermal deformation absorption of pipes.

They are popularly used in automatic measuring and control equipment’s, mechanical industry, transportation, vacuum technology, electric power industry and atomic energy industry.

How 321 Stainless Steel Strip Used In Metal Bellows?

321 stainless steel strip is commonly used in the manufacturing of metal bellows due to its excellent corrosion resistance and high temperature resistance properties.

Metal bellows are flexible, accordion-like components used in various applications such as expansion joints, seals, compensators, and vibration dampers.

Why Do We Use 321 Stainless Steel Strip For Metal Bellows?

Stainless steel 321 strips provide great oxidation resistance and resistance to chemical corrosion.

The metal alloy has great creep strength.

In most cases, they are materials used for expansion joints and metal bellows. Metal Bellows made from stainless steel strips are known to offer versatility in terms of their high pressure, capability of withstanding high temperatures and offering great corrosion protection.

Benefits Of Using 321 Stainless Steel Strip In Metal Bellows?

A high downtime cost that has a close association with part failure illustrates the benefits of stainless steel metal bellows.

Purchasing metal bellows of higher quality is much better when compared to purchasing a stainless steel expansion joint.

There is a design team that will be responsible for designing the expansion joints at no extra manufacturing time or cost.

The stainless steel 321 chemical composition makes maintaining and cleaning of the metal bellows to be quite easy.

Stainless steel metal bellows can be used in resolving small piping deviations and reducing connection stress.

The stainless steel strips in metal bellows are available in a wide variety of sizes and designs.

Stainless steel has great absorption qualities, is very flexible and long lasting.

This quality makes it possible for stainless steel to easily take in deformations that have been caused by changes in temperature and thermal expansion.


Stainless steel strips metal bellows have for a long time been an important component in sealing and sensing applications. The ubiquity of metal bellows has made most engineers to consider them as generic products.

It is important that you start with fundamental application details whenever you are choosing 321 stainless steel strip for metal bellows production. The most popular fundamental detail is the dimensional specification.

Ensure the tolerance, quality of 321 material, edge section and other features match your metal bellows production requirements and needs.

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