A: Of course, the higher the strength of tungsten steel pipe, the better. The higher the strength, the stronger the mechanical properties, the higher the hardness, the greater the theoretical stress, so it is more anti-explosive, but it depends on your blasting force. If the blasting force is too great, all materials are white.

What is the best material for drawing dies? The main failure forms of drawing die are strain and wear, and a few die steels will crack. According to this idea, die steel with good microstructure uniformity and high hardness, such as Yu Hui PM4 powder steel, with hardness HRC64-66, high purity, high alloy content, and excellent friction and wear resistance. The brushed iron is made of Yu Hui PM4 powder steel, which has been brushed for 2 million times without scratches or scratches.

I received a consultation yesterday, which brought my thoughts back to my school days. I feel a little bright and a little backward.

Teacher Zhang's drawing die is to draw 4~5 thick pickling plates. Now, bearing steel is used as a mold. In case of rapid wear, the mold is still easy to be strained after being coated with a layer of oil and paper. What kind of die steel can reduce die strain?

Using bearing steel as drawing die is the material selection method taught by my teacher when I was studying in school in the last century. At that time, the stamping die materials were all carbon tool steels of T8 and T 10, such as GCr 15 (bearing steel) and 60Si2Mn (spring steel), all of which were low-alloy steels, belonging to high-end steels, and were unwilling to be used in general occasions. Can come out to work, called the southern city, and no one will use these low-alloy tool steels as molds.

Therefore, when I heard that someone used bearing steel as a drawing die, I felt inexplicably cordial, but suddenly I felt backward.

Generally speaking, bearing steel refers to GCr 15, carbon content 1.0% and chromium content 1.5%. The full name is high carbon and high chromium rolling bearing steel, and it is also a low alloy cold working die steel. Compared with carbon tool steel, the wear resistance and hardenability of low-alloy tool steel have been greatly improved, but there are still many defects, such as the large-section low-alloy tool steel can not be completely hardened, the die has soft spots, the local hardness can not be improved, and the wear resistance is poor; Moreover, the poor smelting process of high carbon steel is an inevitable defect, which is prone to adhesive wear and friction wear. When used for drawing dies, die strain is an inevitable result.

However, high-alloy tool steel (also known as cold-working die steel) or high-speed steel generally has no soft spots or poor hardenability, and has high quenching hardness and good wear resistance. The wear resistance of high alloy tool steel is about three times that of low alloy tool steel.

Therefore, the bearing steel for wire drawing die is easy to be broken, which is an error in material selection. Replacing it with high alloy tool steel is the fundamental reason to solve the problem.