Fastener industry development: demand for wire and steel wire

Compared with similar foreign products, there are still many gaps between our country's stainless steel wire and similar products abroad. Iron and steel enterprises must keep up with the market rhythm, research and develop new varieties, replace imports, and meet the development needs of the fastener industry.

However, the quality, performance, variety, and specifications of domestic steel cannot meet the needs of the fastener market. For example, rivets have developed rapidly in recent years. They are widely used in aircraft, ships, automobiles, machinery, household appliances, construction and decoration, containers and other industries. The market demand is increasing. In the past, carbon structural steel wire for cold top forging, cold Alloy structural steel wire for upsetting, stainless steel wire or non-ferrous metal wire for cold heading is made by cold heading. At present, it has developed to adopt all-steel blind rivets, all-stainless steel blind rivets, Monel alloy blind rivets, etc. Products have high special requirements for tensile strength, shear strength, corrosion resistance, oxidation resistance, and non-magnetic properties of steel, but some domestic steels are still difficult to meet. For example, the stainless steel wire used in the manufacture of all-stainless steel blind rivets, domestic products still have many problems in terms of varieties, specifications and suitability for cold heading. The stainless steel wire imported from South Korea and Japan has the right variety and specifications and is suitable for cold heading. They are all solution treated and delivered in a pickled state. There will be no environmental problems during further processing, good processing performance, and stable product quality.

With the rapid development of municipal construction, the application fields of fasteners continue to expand, the market demand increases, and the consumption of steel is also increasing. For example, in recent years, the pace of localization of urban transportation rail transit equipment and rail transit vehicles has accelerated, which requires a large number of fasteners. For example, Shanghai’s maglev project, a national key project, has a total length of 30km and requires 1.5 million sets of high-strength bolts to fasten the connection between the magnetic levitation stator core and the beam. standard. To this end, Shanghai No. 5 Steel Company has provided more than 800 tons of high-quality high-strength bolt steel. The fastener market is getting bigger and bigger. In addition to normal carbon steel, the steel used for fasteners also includes stainless steel, high-temperature alloy steel, aluminum-magnesium alloy, Monel alloy, and so on. It seems that small screws and nuts are also developing rapidly. For example, Shanghai Shenguang High Strength Bolt Co., Ltd. is a professional enterprise that produces high-strength bolt connections and cylindrical head welding nails, welding studs, welding pins and anchors for arc stud welding. 5 million sets of bolt connection pairs, 20 million pieces of welding nails for arc stud welding, high-quality alloy structural steel 20MnTiB, 35VB, 35# high-quality carbon steel nuts, and 45# high-quality carbon steel washers. In addition, the welding studs, welding pins and anchors used in shipbuilding, boiler, chemical, machinery and other industries are made of stainless steel or alloy steel.

Introduction to the performance and application of cold heading steel wire rod:

Cold heading steel wire rod is mainly used to manufacture bolts, nuts, rivets, bolts and other fasteners, and its chemical composition and metallographic structure requirements are relatively high. The current annual demand for cold heading steel wire rod is about 1 million tons, of which The automobile industry needs 100,000 tons, but due to technical reasons, the domestic cold heading steel wire is only 300,000 tons, and nearly 700,000 tons are imported every year. According to statistics, the demand for φ6.5mm below is 150,000 tons, φ8mm requires 160,000 tons, and φ9mm and φ14mm each require 80,000 tons. The current domestic market is in short supply, which affects the production of fasteners. As a result, my country still needs to rely on imported fasteners to make up for the shortcomings every year. In 2000, the import volume of fasteners in my country was 93,400 tons, and the import value was 395 million US dollars, which was an increase of 17.5% and 27.4% respectively over the 79,400 tons and 310 million US dollars in 1999.