How to distinguish the quality of 304 stainless steel

Customers often raise questions about why the prices of the same 304 stainless steel pipes can vary so much. There are ones priced at 100 yuan per square meter and others at over 1,000 yuan per square meter. So, how can we distinguish the quality of 304 stainless steel pipes? Let's take a look at the relevant knowledge introduction about the classification of 304 stainless steel materials below. Now, let's talk about how to distinguish the quality of 304 stainless steel pipes. 

Check if there are any irregular surfaces. Such irregularities are caused by the wear of the rolling groove surfaces. 

2. Inferior products are prone to scratching, and their surfaces are likely to develop burrs, cracks and other issues. However, high-quality products have their components evenly distributed, and the cutting head and the end face are all smooth and flat, without any of the aforementioned problems. 

3. The inner diameter of inferior stainless steel seamless pipes fluctuates greatly. This is mainly due to the impure composition of the steel, as well as the poor equipment and limited construction techniques of the manufacturers. These factors can also cause significant deviations in the inner diameter of the stainless steel pipes. 

Poor-quality 420 stainless steel pipes are prone to folding. You can check the surface of the stainless steel pipe to see if there are any creases. For Diqing 430 stainless steel pipes, the reason for the creases is mainly due to the manufacturers' pursuit of yield, which causes deviations during the rolling process. The strength of the welded pipes is thus affected. 

The above points represent the technical analysis and explanation of the differences and advantages of stainless steel seamless pipes. 

During the production process, 304 stainless steel pipes may have burrs. This situation is quite normal. Prompt handling will not affect the final product. However, there are certain methods and techniques for dealing with the burrs on 304 stainless steel pipes. Let's talk about how to solve the problem of burrs on 304 stainless steel pipes below. 

1. Rolling method: This method utilizes a rolling device inserted into the pipe to cause plastic deformation of the internal burrs, thereby achieving the effect of reducing the thickness of the internal burrs. 

2. Oxidation method: At the beginning of the steel pipe welding process, an exhaust nozzle is used to inject an oxygen stream into the inner weld seam. The welding residual heat of the weld seam is utilized to accelerate the oxidation of the inner burrs, and the gas stream is discharged, causing the burrs to fall off. 

3. Cutting method: This method involves inserting a fixed blade or a rotating cutting head into the pipe to cut off the burrs. 

4. Pulling Method: When the stainless steel pipe passes through the mold, the circular blade of the floating plug acts to remove the burrs inside the pipe.