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1.Stainless steel pipe wall thickness inspection: Micrometer, ultrasonic thickness gauge, no less than 8 points at both ends and record.
2.Check the outer diameter and ovality of stainless steel pipe: caliper, vernier caliper, ring gauge, and measure the maximum and minimum points.
3.Inspection of stainless steel pipe length: steel tape measure, manual and automatic length measurement.
4.Inspection of bending degree of stainless steel pipe: straightedge, level (1m), feeler gauge, thin wire to measure the bending degree per meter and the total length bending degree.
5.Inspection of the bevel angle and blunt edge of the end face of the stainless steel pipe: square, chuck.
In the steel industry, the material is different, but the surface of the stainless steel pipe looks the same, there is no difference. The difference in the material is mainly reflected in the performance. For example, although both 301 and 304 stainless steel pipes have 300 columns, there is still a big difference between the two. If you don't pay attention when purchasing, things will go wrong.
Let the editor of Shining Stainless Steel specifically talk about the difference between the two:
1.Chemical composition: 301 stainless steel grade: 12Cr17Ni7. Chemical composition: C: ≤0.15, Si: s10, Mn: ≤2.0, Cr: 16.0~18.0, Ni: 60-8.0, S: ≤0.03. The grade of 304 stainless steel: 0Cr18Ni9. Chemical composition: C: ≤0.08, Si: s10 Mn: s2.0, Cr: 180~20.0, Ni: 8.0~10.5, S: s0.03. The difference in chemical composition between the two is that 304 has lower carbon content than 301, and higher nickel and chromium content.
2.Performance: 304 stainless steel pipe has better corrosion resistance and ductility than 301; 301 stainless steel pipe has a higher hardness, so its abrasion resistance and fatigue strength are better than 304 stainless steel pipe.
3.Application: 301 tube is generally used for elastic applications, such as making springs. The good corrosion resistance of 304 stainless steel pipe is generally used in food, kitchen and bathroom, water treatment, etc.
4.Price: 304 stainless steel pipe is more expensive than 301. Some unscrupulous merchants on the market will sell 301 as 304 to deceive consumers. When purchasing, everyone should pay attention to finding reliable suppliers. In short, when purchasing stainless steel pipes, you must first know your purpose before looking for stainless steel pipes of suitable materials. In case the stainless steel pipes you bought were found to be unsuitable after being used, it was time-consuming, labor-intensive and expensive.