Evolution of Stainless and Acid-Resistant Steel Classification in Poland

With Poland's accession to the European Union, many norms and standards were revised to align with European regulations. This also applies to the classification of steel, including stainless and acid-resistant steel. Let's take a look at how the classification of these materials has changed over time.

Historical Classification

Before the introduction of the PN-EN 10088 standard, steel classification in Poland was more traditional and based on domestic standards. This classification primarily distinguished:

• Stainless Steel: Known for its corrosion resistance, it contained at least 10.5% chromium. It was widely used in the food, medical, and construction industries.
• Acid-Resistant Steel: A special type of stainless steel that additionally contained more molybdenum and nickel, enhancing its resistance to acids. It was mainly used in the chemical and petrochemical industries.

New Classification After Joining the EU

After Poland joined the European Union and the PN-EN 10088 standard was implemented, steel classification was simplified and harmonized with European standards. The term "acid-resistant steel" is no longer explicitly used. Instead, steel with increased corrosion resistance is divided into three main types:

Stainless Steel:

• Retains its basic definition as steel containing at least 10.5% chromium.
• Encompasses a wide range of steels with different chemical compositions and properties, including those previously classified as acid-resistant.

Heat-Resistant Steel:

• Resistant to high temperatures and temperature fluctuations.
• Used in applications requiring high strength under extreme thermal conditions.

Creep-Resistant Steel:

• Offers corrosion resistance at high temperatures.
• Ideal for environments with constant exposure to high temperatures.

Acid-Resistant Steel as Part of Stainless Steel

In the new classification, acid-resistant steel is considered a variant of stainless steel. This means that all properties and benefits of acid-resistant steel are now included in the broader category of stainless steel.

Summary

The change in steel classification in Poland after joining the European Union may have caused some confusion, especially among those accustomed to traditional Polish norms. However, the new classification according to the PN-EN 10088 standard has brought greater clarity and alignment with European standards, facilitating trade and the use of steel in various industrial sectors.

The new classification highlights the significance of acid-resistant steel as a key component of stainless steel, confirming its versatility and exceptional resistance properties. This allows businesses to more easily select appropriate materials for their needs, using uniform and comprehensible standards.

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