Dual phase steel Fasteners
Fastener is a kind of mechanical parts used for fastening and connection and widely used. Fasteners are widely used in a wide range of industries, including energy, electronics, electrical appliances, machinery, chemical industry, metallurgy, mold, hydraulic pressure and so on. Various fasteners can
PRODUCT INTRODUCTION
Fastener is a kind of mechanical parts used for fastening and connection and widely used. Fasteners are widely used in a wide range of industries, including energy, electronics, electrical appliances, machinery, chemical industry, metallurgy, mold, hydraulic pressure and so on. Various fasteners can be seen in various machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, chemicals, instruments and supplies, which are the most widely used mechanical basic parts. It is characterized by a wide variety of specifications, different performance and uses, and the degree of standardization, serialization and generalization is also very high. Therefore, some people call the fasteners with national standards as standard fasteners or standard parts for short.
Application of dual phase steel fasteners：
Fasteners are a kind of mechanical parts used for fastening and connection and widely used. All kinds of fasteners can be seen on all kinds of machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, meters and supplies. It is characterized by a wide range of varieties and specifications, different performance and uses, and the species degree of standardization, serialization and generalization is also very high. Therefore, some people also call a class of fasteners with existing national standards as standard fasteners, or standard parts for short. Fasteners are the most widely used mechanical basic parts. With China's entry into WTO in 2001, it has entered the ranks of major international trading countries. China's fastener products are exported to countries all over the world, and fastener products from countries all over the world are also pouring into the Chinese market. As one of the products with large import and export volume in China, the realization of fasteners in line with international standards has important practical and strategic significance for promoting Chinese fastener enterprises to go to the world and promoting fastener enterprises to fully participate in international cooperation and competition. Due to the specification, dimension, tolerance, weight, performance, surface condition, marking method of each specific fastener product, as well as the specific requirements of acceptance inspection, marking, packaging and other items.
Standard for duplex steel fasteners：
| Size | Specify the basic dimensions of the product; Threaded products. |
| Tolerance | Specify the product dimensional tolerance and geometric tolerance. |
| Mechanical properties | Specify the marking method of product mechanical performance grade and the contents of mechanical performance items and requirements |
| Surface defect | Specify the types and specific requirements of product surface defects. |
| Surface treatment | Specify the types and specific requirements of product surface treatment. |
| Test | Specify the contents of the above performance requirements and tests. |
| Marking method | Specify the contents of complete product marking method and simplified marking method. |
| Other | Such as the standard of fastener terminology, the standard of fastener product weight, etc |
12 Parts of Fasteners：
1.Bolt；2.Stud；3.screw；4.Nut；5.Self tapping screw；6.Wood screw；7.Washer；8.Retaining ring；9.Pin；10.rivet；11.Components and connecting pairs；12.Welding nail
Fastener Commonly Used Testing Instrument：
The most important link in the development and design of fasteners is quality control. There are several checkpoints from feeding to finished product shipment, which have different inspection methods. First of all, the feed is related to appearance, size, elements, performance, detection of harmful substances, etc; In terms of process, it is more about appearance, size, knocking experiment and forging flow line; Heat treatment is more about appearance, hardness, torque, tension, metallography and so on; Surface treatment is more about hydrogen embrittlement test, coating, salt spray, etc., including a harmful substance test for shipment. In terms of size and appearance inspection, the common ones are secondary element, contour measuring instrument, coordinate measuring instrument and image sorter (this is a total sorter); Mechanical and chemical testing mainly includes hardness machine (Rockwell and Vickers), tensile machine and metallographic microscope; In terms of material detection, there is a spectrum analyzer and a salt spray tester.