What is the standard for 12.9 grade high strength screws?

What is the standard for 12.9 grade high strength screws?

Grade 12.9 high-strength screws did not circulate such high-strength screws in the early industrial development of our country. At that time, the industrial technology was still in its infancy, and this 12.9-grade high-strength screw required very accurate heat treatment technology to complete its performance index. At that time, there was no such technical condition in China. In fact, we often said that 12.9-grade high-strength screws, most of which refer to hexagon socket head cap screws.

What is the standard for 12.9 grade high strength screws?

With the development of industry, there are more and more large domestic equipment manufacturers, and it is impossible to import high-strength screws completely. Especially in the early days of some large injection equipment, there were as many 12.9-grade high-strength screws of various specifications used in one equipment as smoke, which put a lot of pressure on the entire equipment cost. After Baosteel R & D, domestic alloy steel materials official interview, domestic fastener manufacturers also seize the opportunity to make every effort to develop 12.9 grade high-strength screws, development after a few years basically do not need to import these products.

So far, no matter which industry the market is, it is basically saturated. For the fastener industry, there are nearly 10,000 large and small companies in Wuxi, which have launched fierce competition. According to Dell, 12.9-grade high-strength screws are produced in Taiwan, China, and then flow into the mainland, forming a booming industrial layer.

What should be paid attention to in the heat treatment of grade 12.9 high strength screws?

The first is definitely the human factor. Whether the employees are professional or not is obviously important. Because everything is controlled by people. However, controlling the quality of 12.9-grade high-strength screws is not only a question of the number of people, but also requires a clear division of labor, a clear position, clear all the details involved, and improve other operating skills of each part.

Then the equipment. There is no doubt that advanced equipment plays an important role in the accuracy of products. Relevant complete overhaul equipment needs to be re-inspected and repaired by experts. Ensure that the equipment is always in good production condition.

There is also the raw material of high strength screws. Screw is good or bad, take a step of the gate is the material. If the material itself is not up to standard, how you throw the screws behind is not up to standard.

What is the difference between grade 12.9 high-strength screws and ordinary screws

In terms of raw materials:

High-strength screws are made of high-strength materials. The screws, nuts, and washers of high-strength screws are made of high-strength steel, generally using 45 steel, 40 reinforced, and 20 titanium reinforced. General screws are generally made of Q235 steel. From the strength level:

The use of 12.9-grade high-strength screws is becoming more and more widespread. The commonly used strength grades are 8.8s and 10.9s, of which the 10.9 grade is the most. Generally, the strength level of screws is low, generally 4.4, 4.8, 5.6, and 8.8.