Recently, the large rolling mill of Handan Iron and Steel Co., Ltd. has successfully trial-rolled 24mm limit specification ML20MnTiB, 10B21 and other cold heading steel products, the mechanical properties, cold top forging and surface quality all meet the requirements of the standard. After trial by customers, ML20MnTiB can meet the needs of large deformation cold heading of 10.9s torsional shear bolts, and the bolt performance can fully meet the standard requirements of torsional shear type high strength bolts for steel structures.
It is understood that the diameter 24mm wire rod is mainly cold heading steel, which is used to make fasteners and is widely used in aerospace, high-speed railway, automobile manufacturing, engineering construction and other important fields. The market demand is large, and because of the technical difficulty in developing this specification, compared with other cold heading steel, the market price is higher.
In close cooperation with the Technical Center, the Special Steel Division and the large rolling mill, according to the working concept of "simple, pragmatic and effective", we actively open up the market, develop new roll passes, and formulate scientific and reasonable trial-production process parameters. carry out tests and follow up the use effect of customers in time to ensure the successful trial production of 24mm limit specification cold heading steel.
