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Hot Stamping of Ultra-High-Strength Steel Parts
Published in R. Ganesh Narayanan, Jay S. Gunasekera, Sustainable Material Forming and Joining, 2019
The strength of quenchable steel sheets increases with increasing carbon content, whereas the ductility drops. In addition, the quenchability is changed by the amount of alloying elements, such as chromium, manganese, molybdenum, etc., the grain size of austenite, the cooling rate, and so on. In hot stamping, manganese–boron steel, 22MnB5, in which the quenchability is improved by adding elements such as manganese and boron, is generally used. As shown in Table 9.1, the carbon content of this steel is as low as 0.22 mass% to ensure toughness.
Materials used in vehicle bodies
Published in Andrew Livesey, Alan Robinson, The Repair of Vehicle Bodies, 2018
A particular type of HSS is referred to as boron steel, containing a very small amount of boron, typically 0.001 to 0.004 percent. This steel is used by many of the major manufacturers such as Vauxhall and requires special repair techniques. To join boron steel panels the method used is often MIG brazing.
Characterization of the interfacial friction properties in the hot stamping process
Published in Journal of the Chinese Institute of Engineers, 2023
Chien-Hsing Lee, Ching-Hua Hung, Yao-Wei Cheng, Cheng-Kai ChiuHuang, Fuh-Kuo Chen
Advanced high strength steels (AHSSs) have been extensively used to effectively reduce the weight of automotive bodies, facilitating the manufacturing of lightweight cars (Kim et al. 2012; Bardelcik et al. 2010). However, when an AHSS sheet is subjected to a cold stamping process, the formability decreases as the steel strength increases, frequently causing springback and fracture defects in the part produced. Hot stamping has thus emerged as a promising process. In this process, boron steel is heated in a furnace to over 930°C and then transferred to a press, where it is formed and quenched in a set of stamping dies to achieve a martensitic structure. The forming temperature in hot stamping is about 700°C, and the steel sheet is quenched to a temperature of about 200°C. The formability is improved and the springback is minimized when a steel sheet is formed at elevated temperature, and the resulting martensitic structure enables the formed parts to exhibit extremely high tensile strengths of up to 1,500 MPa (Karbasian and Tekkaya 2010).