How To Distinguish The Quality Of Tungsten Steel Knives?

How to distinguish the quality of tungsten steel knives?

The following are several commonly used methods to distinguish fake and inferior tungsten steel tools

1. Fake tungsten steel tools are prone to folding. Folding is a variety of fold lines formed on the surface of tungsten steel tools, and this defect often runs through the longitudinal direction of the entire product. The reason for folding is due to the pursuit of high efficiency by fake and inferior manufacturers. Source: The mold technology Daquan. The amount of reduction is too large, which produces ears. The next rolling will produce folds. The folded products will crack after bending. Tungsten steel tools The intensity is greatly reduced.
2. Fake tungsten steel tools often have pitting on the surface. Source: Daquan Die Technology Daquan Netting surface is due to the serious wear of the rolling groove caused by the irregular unevenness of the surface of the tungsten steel tool. As the manufacturers of counterfeit and inferior tungsten steel tools are pursuing profits, the groove rolling often exceeds the standard.
3. Fake tungsten steel tools are prone to scars on the surface. There are two reasons: 1. The material of fake tungsten steel tools is uneven and there are many impurities. 2. Fake and inferior material manufacturers have simple guide and guard equipment and are easy to stick to steel. These impurities will easily cause scars after biting the roll.
4. The surface of fake and inferior materials is prone to cracks. The reason is that the blank is adobe, which has many pores. The adobe is subjected to thermal stress during the cooling process, and cracks are generated. After rolling, there will be cracks.
5. Fake and inferior tungsten steel tools are easy to scratch. The reason is that the equipment of the fake and inferior material manufacturers is simple and easy to produce burrs and scratch the surface of tungsten steel tools. Deep scratches reduce the strength of tungsten steel tools.
6. Fake tungsten steel tools have no metallic luster, and are light red or pig-iron-like color. There are two reasons. Its blank is adobe. 2. The rolling temperature of counterfeit and inferior materials is not standard. Their steel temperature is visually inspected. In this way, rolling cannot be carried out in the specified austenite area, and the performance of tungsten steel tools will naturally not reach the standard.
7. The cross ribs of counterfeit tungsten steel tools are thin and low, and often appear dissatisfied. The reason is that in order to achieve a large negative tolerance, the reduction of the first few passes of the finished product is too large, the iron type is too small, and the hole type is not full.
8. The cross-section of the counterfeit tungsten steel tool is elliptical. Source: Mold Technology Daquan Network. The reason is that in order to save materials, the reduction of the first two passes of the finished roll is too large. The strength of this kind of rebar is greatly reduced. Does not meet the standard of the external dimensions of the rebar.
9. The composition of high-quality tungsten steel tools is uniform, the tonnage of the cold shear is high, and the end face of the cutting head is smooth and tidy. However, due to the poor material of the fake material, the end face of the cutting head often has the phenomenon of meat loss, that is, uneven, and no metallic luster . Moreover, because the products of the fake and inferior material manufacturers have fewer cuts, big ears will appear at the beginning and the end.
10. Fake tungsten steel tool material contains many impurities, the density of steel is too small, and the size is severely out of tolerance, so if there is no vernier caliper, it can be weighed and checked. For example, for rebar 20, the national standard stipulates that the maximum negative tolerance is 5%. When the length is 9M, its single theoretical weight is 120 kg, and its minimum weight should be: 120X (l-5%) = 114 kg , The actual weight of a single piece weighed out is less than 114 kg, it is a fake tungsten steel tool, because its negative tolerance exceeds 5%. Generally speaking, the effect of phasing weighing will be better, mainly considering the problem of cumulative error and probability theory.
11. The inner diameter of counterfeit tungsten steel tools fluctuates greatly, and the reason is; l, the steel temperature is unstable and there is a positive and negative side. 2. The composition of steel is not uniform. 3. Due to the simple equipment and low foundation strength, the source: the bounce of the wire rolling mill. There will be a large change in the inner diameter of the same week, so that the uneven force of the steel bar is prone to fracture.
12. The trademarks and printing of high-quality materials are relatively standardized.
13. For large threads with a diameter of more than 16 tungsten steel tools, the distance between the two marks is more than IM.
14. The longitudinal ribs of counterfeit tungsten steel tool rebar are often wavy.
15. As the manufacturers of counterfeit tungsten steel tools do not drive, they are loosely packed. The side is oval.