the difference between 321 and 347 stainless steel strip

What Is The Difference Between 321 And 347 Stainless Steel Strip?

There are a lot of stainless steel strips in the world. Many which have trade names as well as generic grades assigned to them.

This makes it difficult to know what strip you are buying when you place an order. This can cause confusion but fear not, we are here to solve that problem.

In this article, we will look at the difference between 321 and 347 stainless steel strip.

Let’s keep reading.

321 stainless steel strip

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.

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.

What is 347 Stainless Steel Strip?

347 stainless steel strip

347 stainless steel strip is added the niobium.

347 stainless steel strip is one of stabilized stainless steel strips which offers as its main feature an excellent resistance to intergranular corrosion following exposure to temperatures in the chromium carbide precipitation up to 800 degree.

347 stainless steel strip has good mechanical properties for high temperture.

Differences Between 321 Stainless Steel Strips and 347 Stainless Steel Strips

Chemical Composition

The chemical components of grade 321 stainless steel strip is summarized in the following table:

GradeStandardCSiMnPSCrNiMo
321ASTM A240≤0.08≤1.00≤2.00≤0.045≤0.03017.00-19.009.00-12.00

The chemical components of grade 347 stainless steel strip is summarized in the following table:

GradeStandardCSiMnPSCrNiMo
347ASTM A240≤0.08≤0.75≤2.00≤0.045≤0.03017.00-19.009.00-13.00

Mechanical Properties

321 Stainless Steel Strip Mechanical Properties

GradeEN GradeYield Strength Rp0.2(N/mm²)Tensile Strength Rm(N/mm²)Vickers Hardness(HV)Elongation A50%
3211.4541≥205≥520≤200≥40

347 Stainless Steel Strip Mechanical Properties

Yield StrengthTensile StrengthElongationHardness
psi (min.)(MPa)psi (min.)(MPa)% (min.)(max.)
30,00020575,00051540201 Brinell

Applications

What Is 321 Stainless Steel Strip Used For?

321 stainless steel strip is applied to the field machines in the chemical, coal, and petroleum industries that require high resistance to grain boundary corrosion, heat-resistant parts for building materials and parts with difficult heat treatment.

1. Petroleum waste gas combustion pipeline
2. Engine exhaust pipe
3. Boiler shell, heat exchanger, heating furnace parts
4. Silencer parts for diesel engines
5. Boiler pressure vessel
6. Chemical transport truck
7. Expansion joint
8. Spiral welded pipes for furnace and dryers

What Is 347 Stainless Steel Strip Used For?

  1. Chemical Industry
  2. Food Equipment
  3. Petroleum Industry
  4. Pharmaceutical Production Line
  5. Waste Heat Recovery Industry
  6. Heat Exchange Industry
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