How to Handle Rust on 304 Seamless Stainless Steel Pipes
In the standard for stainless steel pipes, three hardness testing methods are specified. Users can choose the most suitable method based on the material's thickness, condition, and their own equipment availability. Like in many other industries, hardness testers are simple to use, easy to operate, and provide direct readings of hardness values. This makes them a popular choice in factories.
When using a Rockwell hardness tester, two scales are typically used: HRC and HRB. For annealed stainless steel, the hardness usually falls between 88–100 HRB, while for quenched and tempered stainless steel, it generally ranges from 32–50 HRC. These tests are commonly applied to stainless steel plates and pipes. However, the test force may not be suitable for thin plates, especially when the thickness is below 1.2 mm, where a Vickers hardness tester might be more appropriate.
If the factory doesn’t require high precision, a Vickers hardness tester can still be used to control the hardness of the workpiece effectively. It’s important to note that improper handling during processing or installation can lead to surface damage, which may result in rust over time.
One of the main reasons stainless steel pipes develop rust is due to construction activities. During decoration, there are often paints and coatings applied, which can be corrosive and damage the stainless steel surface. To prevent this, it's best to rinse the surface with water and wipe it with a clean cloth. If you're looking for professional help with stainless steel processing at home, consider using a rust removal agent or a rust dissolver. Don't attempt to use soapy water or washing powder, as they may cause more harm than good.
On the other hand, there are several factors that contribute to rusting in stainless steel pipes, along with solutions:
After a stainless steel processor has completed the work, if the pipe starts to rust before installation, there are two common issues. The first is related to welding. If the welder doesn’t properly polish the weld area after welding, it can lead to rust formation. The second issue is surface contamination. When cutting materials, small metal splinters or slag can land on the stainless steel surface, causing corrosion.
Stainless steel is naturally resistant to rust because its surface is polished and has a protective oxide layer. However, once this layer is damaged, the material becomes vulnerable to corrosion and rust. To maintain its integrity, regular cleaning and proper handling during installation are essential. Always ensure that the surface remains clean and free from contaminants to avoid long-term damage.
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