With the rapid development of China's national economy, the spring industry, oil quenching a return spring spring wire (hereinafter referred to as oil hardened steel wire) demand increased year by year, the quality of oil quenching steel wire is also getting higher and higher. In order to meet the domestic spring industry demand for oil quenching steel wire, China's metal products industry in the "Ninth Five-Year" period has introduced a number of oil from abroad quenching a spring spring wire production equipment. To the metal products of the Institute of the pilot plant in the tube furnace heating oil quenching a spring spring wire production line was built as a symbol of the domestic car oil quenching wire production and localization work kicked off.

Now I am engaged in oil quenching steel over 10 years of production experience and understanding of the production of metal products industry, the introduction of China's oil quenching steel wire production, and made a few suggestions and metal products industry colleagues to discuss.

Production history of oil quenched steel wire

Oil quenching wire production has been 100 years of history, began as a means of wire straightening come out. Because it has excellent flexibility and very high fatigue strength, and later attracted the attention of the spring manufacturer. To the 20th century, 20 to 30 years, oil quenching wire in North America, Western Europe has begun to widely used in the manufacture of various springs, the scope gradually expanded. To 1939 the United States ASTM standards have been listed in the oil quenching wire, oil quenching wire at this time the literature is quite a lot. During the Second World War, oil quenched steel wire as a combat aircraft, ships, automotive spring materials and the rapid development. For example, was shot down the United States B-29 aircraft engine valve spring, is the use of Cr-V steel quenching wire. Japan production of oil quenching wire began in 1950, to the 20th century, 70 years Japan and Sweden is the world's production of oil quenching the main origin of steel.

China's oil quenching wire production started in the early 1970s. According to the domestic market needs, the first production of metal products, such as the first oil quenching steel wire test production line, and around the 50CRV, 60 $ i2Mn, 65Mn and other materials to carry out a series of oil quenching steel wire production process research, To achieve the industrialization of mass production.

Early participation in China's oil quenching steel wire production technology and equipment research and can see the literature of the units are Beijing Iron and Steel Institute, Tianjin University, Tianjin compressor valve spring training group, Beijing special steel and other units. The production test equipment used in general is divided into two forms: one is the electrical contact heating + lead bath tempering continuous production line; the other is the tube furnace heating + lead bath tempering continuous production line. As the electrical contact heating by the wire size tolerance, metallurgical quality, voltage fluctuations and other factors, product quality has always been difficult to stabilize. The tube furnace heating mode production due to easy to control the temperature of the wire, energy consumption and no high temperature lead poisoning and other advantages, has been in use ever since.

In the past 20-30 years, although China's metal products industry in the oil quenching product quality has also invested a lot of manpower and material resources, but in the oil quenching wire production technology and equipment failed to track foreign advanced technology, On the quality of domestic wire rod has been poor and other issues of long-term problems, China's oil quenching steel product quality, production technology and equipment has not been a breakthrough. Domestic oil quenching steel wire surface quality, metallurgical quality, through the performance and reliability of the problem is not long-term constraints of China's spring industry development. Many of the spring production plant had to be a high price through the import to solve the problem of raw materials, and foreign steel wire with its excellent quality assurance quickly won the domestic spring production plant trust. Domestic oil quenching steel wire and imported steel wire quality contrast, making the domestic manufacturers engaged in spring manufacturing on the imported wire has been too dependent on the psychological is also an indisputable fact.

With the rapid development of China's automobile and motorcycle, car suspension spring, valve spring, motorcycle damping spring steel wire use gradually increased. By the import price, delivery and payment methods and other issues, high stress spring material localization of the call is getting higher and higher. In the autumn of 1995, the "National High Stress Spring Wire Production Technology Seminar" was held in Zhengzhou by the Institute of Metal Products. At the meeting, the pilot plant announced to the spring industry, the end of 1995 to introduce a high stress oil quenching wire production line, the production of various domestic high-stress oil quenching steel new materials, spring industry unanimously endorsed.