40Cr round steel Products in people's It is very common in life, because the performance of the material is relatively good, so its application field is relatively wide, but it is also because of the large market demand, the material is mixed, and many inferior materials will follow. Then, from what aspects should the vast number of consumers identify the quality of stainless steel?

1. The surface of the fake stainless steel is prone to scarring. This is because the fake steel material is uneven and has many impurities.

2. The surface of the counterfeit material is more prone to cracks. This is because the billet is an adobe, and the stomata pores are subjected to thermal stress during cooling to cause cracks, and cracks occur after rolling.

3, fake steel is prone to folding. Folding is a variety of fold lines formed on the surface of a steel that tends to extend throughout the longitudinal direction of the product. The reason for the folding is that the inferior manufacturer pursues high efficiency, the amount of pressing is too large, and the ear is generated, and the next rolling causes folding, and the folded product is cracked after bending, and the strength of the steel is greatly reduced.

4, 40Cr round steel of the fake steel is easy to scratch, the reason is that the fake inferior material manufacturers equipment is simple, easy to produce burrs, scratching the steel surface. Deep scratches reduce the strength of the steel.

5, the composition of high-quality steel is uniform, the tonnage of the cold-shearing machine is high, the end face of the cutting head is smooth and tidy, and the fake inferior material is often poor in material, and the end face of the cutting head often has the phenomenon of falling meat, that is, unevenness and no metallic luster. And because the fake inferior products manufacturers have fewer heads, big ears will appear at the head and tail.

6. The cross section of the inferior steel is elliptical. The reason is that the manufacturer has to reduce the amount of the two rolls in front of the finished roll in order to save material. The strength of the rebar is greatly reduced, and it does not meet the standard of the rebar dimensions. .

7. Due to the unstable temperature of the steel, there is a yin and yang surface; if the composition of the steel is not uniform, etc., there will be a large change in the inner diameter in the same week. Therefore, the inner diameter of the counterfeit steel material fluctuates greatly, and such a steel bar is unevenly stressed and easily broken.

In summary, these methods can be used to distinguish the quality of 40Cr round steel material.