In life, there are many different types of steel pipes, such as carbon steel pipes, stainless steel pipes, alloy steel pipes, and nickel-based alloy steel pipes. However, can you really recognize those steel pipes? Today we will lead you to re-understand stainless steel pipes
The surface of stainless steel is relatively smooth, the color is bright silver, and the reflection is uniform, and it has good anti-fingerprint properties.
Magnetic Test
If it is common 304 316 stainless steel, it is scientifically called austenitic stainless steel pipe. Austenitic stainless steel pipe is usually non-magnetic when annealed. If it is cold-worked, it may be a little magnetic.
In addition to austenitic stainless steel, there are actually 400 series ferrite (430 439) and martensite (410 420) that will have strong magnetic reactions.
Copper sulfate solution test (CuSO₄)
After cleaning the oxide layer, drip water and then wipe the surface with copper sulfate solution (5-10%). If it turns red, it is carbon steel. If it does not change color, it is stainless steel.
Watching the Sparks
You can cut out a small section of steel pipe and grind it on a grinder to observe the sparks. Carbon steel sparks are relatively dense, while stainless steel has almost no sparks. If there are any sparks, they are streamlined.
Corrosion resistance test
From the previous two articles, we can see that stainless steel has a stronger corrosion resistance. So how do we test it? We usually use nitric acid for corrosion testing (Warning: This test needs to be conducted in a professional laboratory, wearing protective measures, otherwise it will be dangerous). Drop a drop of strong nitric acid on the surface of the test product in a ventilated place and let it stand for 5 minutes. If brown bubbles begin to appear on the surface, it is determined that the material is not stainless steel or carbon steel. If there is almost no obvious change, it is real stainless steel.
Normally, we can tell whether it is stainless steel directly by its appearance, but experiments are the only criterion for testing the truth, so we can further determine whether it is stainless steel by magnetism, copper sulfate, sparks and nitric acid. Of course, there are also stainless steel identification reagents (potions) on the market that are convenient and economical and can be used to determine common brands, but you should follow the instructions and refer to the standard color card. Well, after learning this, you can clearly determine whether it is stainless steel. If you have any questions, you can also send them to our email and our engineers will further answer your questions.
In life, there are many different types of steel pipes, such as carbon steel pipes, stainless steel pipes, alloy steel pipes, and nickel-based alloy steel pipes. However, can you really recognize those steel pipes? Today we will lead you to re-understand stainless steel pipes
The surface of stainless steel is relatively smooth, the color is bright silver, and the reflection is uniform, and it has good anti-fingerprint properties.
Magnetic Test
If it is common 304 316 stainless steel, it is scientifically called austenitic stainless steel pipe. Austenitic stainless steel pipe is usually non-magnetic when annealed. If it is cold-worked, it may be a little magnetic.
In addition to austenitic stainless steel, there are actually 400 series ferrite (430 439) and martensite (410 420) that will have strong magnetic reactions.
Copper sulfate solution test (CuSO₄)
After cleaning the oxide layer, drip water and then wipe the surface with copper sulfate solution (5-10%). If it turns red, it is carbon steel. If it does not change color, it is stainless steel.
Watching the Sparks
You can cut out a small section of steel pipe and grind it on a grinder to observe the sparks. Carbon steel sparks are relatively dense, while stainless steel has almost no sparks. If there are any sparks, they are streamlined.
Corrosion resistance test
From the previous two articles, we can see that stainless steel has a stronger corrosion resistance. So how do we test it? We usually use nitric acid for corrosion testing (Warning: This test needs to be conducted in a professional laboratory, wearing protective measures, otherwise it will be dangerous). Drop a drop of strong nitric acid on the surface of the test product in a ventilated place and let it stand for 5 minutes. If brown bubbles begin to appear on the surface, it is determined that the material is not stainless steel or carbon steel. If there is almost no obvious change, it is real stainless steel.
Normally, we can tell whether it is stainless steel directly by its appearance, but experiments are the only criterion for testing the truth, so we can further determine whether it is stainless steel by magnetism, copper sulfate, sparks and nitric acid. Of course, there are also stainless steel identification reagents (potions) on the market that are convenient and economical and can be used to determine common brands, but you should follow the instructions and refer to the standard color card. Well, after learning this, you can clearly determine whether it is stainless steel. If you have any questions, you can also send them to our email and our engineers will further answer your questions.
