Stainless steel seamless pipe material types

In this rapidly developing society, people are always longing for a beautiful residence. The decoration of the residence reflects the personality and aesthetic views of the owner. Stainless steel is indispensable in the decoration of the residence. Then everyone understands the classification of stainless steel  seamless pipe materials. ? So below we will give you a detailed introduction.

Stainless steel material introduction

Whether stainless steel has magnetic properties mainly depends on the nickel content. The highly magnetic stainless steel (430) contains chromium but does not contain nickel. It is also called Cr stainless steel and has certain anti-corrosion capabilities. Stainless steel contains both chromium and nickel. Since nickel is a relatively stable element, its corrosion resistance is naturally much stronger than that of stainless steel. Since nickel is more expensive, the cost of stainless steel is higher than that of stainless steel. Iron, coupled with the difference in corrosion resistance, the price of stainless steel is 1/4 to 1/3 higher than that of stainless iron.

Stainless steel material classification

Stainless steel materials are usually divided into matrix structures:

1. Ferritic stainless steel. Containing 12% to 30% chromium, its corrosion resistance, toughness and weldability increase with the increase of chromium content, and its chloride stress corrosion resistance is better than other types of stainless steel.

2. Austenitic stainless steel. It contains more than 18% chromium, and also contains about 8% nickel and a small amount of molybdenum, titanium, nitrogen and other elements. It has good comprehensive performance and can withstand corrosion from various media.

3. Austenite. Ferritic duplex stainless steel combines the advantages of austenitic and ferritic stainless steel and has superplasticity.

4. Martensitic stainless steel. High strength, but poor plasticity and weldability.

The relationship between chemical composition and stainless steel properties

1. Carbon C: It can increase hardness and strength. Too high content will reduce its ductility and corrosion resistance.

2. Chromium: It can increase corrosion resistance and oxidation resistance, refine the grains, increase strength, hardness and wear resistance.

3. Nickel: It can increase high-temperature strength and corrosion resistance, and reduce the rate of cold work hardening.

4. Molybdenum: Increases strength and has excellent corrosion resistance to oxides and seawater.

5. Copper Cu: It is beneficial to cold working and forming and reduces magnetism.