5754 H22 and 5454 H22: Which One for Chemical Tanks?

When it comes to chemical tanks, pressure vessels, and tank trailers, aluminum‑magnesium alloys are widely favoured for their light weight and corrosion resistance. Among the available grades, 5754 H22 and 5454 H22 are two popular options – both belonging to the 5xxx series, yet each offering distinct advantages. This article compares them across composition, mechanical properties, temperature tolerance, and weldability to support your selection process.

What is 5754 H22?

– Composition: Magnesium 2.60–3.60%, manganese ≤0.50%, silicon ≤0.40%.  

– Typical mechanical properties (H22 temper):  

  – Yield strength (0.2% proof): ≥130 MPa  

  – Tensile strength: 220–270 MPa  

  – Brinell hardness: ≈63 HB  

  – Elongation (A50 mm): ≥7%  

– Key features:  

  – Excellent corrosion resistance, especially in marine and industrial atmospheres.  

  – Outstanding weldability (MIG, TIG, and resistance welding all perform well).  

  – Good cold formability – suitable for bending and stamping.  

– Common uses: welded structures, storage tanks, shipbuilding, and tank trailers under normal temperature conditions.

What is 5454 H22?

– Composition: Magnesium 2.40–3.00%, manganese 0.50–1.00%, plus a small amount of chromium (0.05–0.20%).  

– Typical mechanical properties (H22 temper):  

  – Yield strength (0.2% proof): ≥180 MPa  

  – Tensile strength: 250–305 MPa  

  – Brinell hardness: ≈74 HB  

– Key features:  

  – Very good corrosion resistance, comparable to 5754 in most environments.  

  – Maintains strength at elevated temperatures – performs well between 65°C and 170°C.  

  – High fatigue strength, making it suitable for cyclic loading.  

  – Good weldability with all common commercial methods.  

– Common uses: chemical storage tanks, pressure vessels, boiler components, and offshore equipment, especially where service temperatures exceed 65°C.

Key Differences Between 5754 H22 and 5454 H22

The most critical differences between these two alloys lie in three aspects:

1. Strength – 5454 H22 offers a significantly higher yield strength (≥180 MPa vs. ≥130 MPa) and slightly higher tensile strength, making it the stronger choice for heavy loads.
2. Temperature resistance – This is the decisive factor for chemical tank applications. 5454 H22 is specifically designed to retain its mechanical properties at temperatures from 65°C up to 170°C, whereas 5754 H22 is best suited for ambient or lower‑temperature service.
3. Formability – 5754 H22 has a higher elongation (≥7%) than 5454 H22 (typically around 4–7% depending on thickness), giving it an edge in complex forming operations such as deep bending or stamping.

Both alloys are supplied in the H22 temper – work‑hardened and partially annealed – which provides a balanced combination of strength and ductility for tank fabrication. They are ready for welding and bending as‑delivered, with no need for additional surface treatment or post‑processing.

Selection Guide for Chemical Tank Applications

Choose 5754 H22 when:

– Operating temperatures remain at ambient or below 65°C.

– The tank design involves intricate forming or tight radii.

– Cost efficiency is a priority (5754 is generally more economical).

Choose 5454 H22 when:

– Service temperatures are consistently above 65°C (up to 170°C).

– Higher strength is required for pressure or structural integrity.

– The tank is subject to frequent pressure cycles or fatigue loads.

In many cases, the temperature criterion alone determines the choice. For standard chemical storage at room temperature, 5754 H22 is a reliable and cost‑effective option. For heated contents or outdoor installations in hot climates, 5454 H22 provides the necessary safety margin.

Frequently Asked Questions

Q: Which alloy offers better corrosion resistance?  

A: Both are excellent; 5454 is slightly superior in aggressive environments, but the difference is marginal for most chemical tanks.

Q: What is the most important factor when choosing between them?  

A: Operating temperature – if it exceeds 65°C, choose 5454 H22; otherwise, 5754 H22 is preferred for its better formability.

Q: Can both be welded without special procedures?  

A: Yes, both are readily weldable using MIG, TIG, or resistance welding with standard filler alloys.

*Henan Mingtai Al supplies both alloys in a wide range of thicknesses, with strict quality control and flexible dimensions to suit your project requirements. Feel free to contact us for further technical support.*