Weight saving, reduction of CO2 emissions and the improvement of crash safety, these are some of today’s important goals for the automotive industry. An innovative manufacturing technology called hot stamping, can help to meet these goals.To get more news about Stamping steel parts, you can visit tenral.com official website.Hot stamping technology is delivering sheet metal auto body structural parts with high strength-to-weight ratio. The technology links the established knowledge of martensitic hardening of special high strength steels with the well-known benefits of deep-drawing processes at higher temperatures. The main benefits of this deformation process are the good plastic formability and the prevention/ avoidance of springback. Thus, components with high strength and high geometrical complexity can be produced with excellent shape accuracy in a single stroke.Sheet material used with hot stamping technology consists of the boron steel 22MnB5 and is offered by several steel plants using different trade marks: BTR 165 from Benteler; MBW from ThyssenKrupp Steel; ultraform from Voestalpine, and USIBOR 1500P from Arcelor Mittal.Automotive parts produced today by hot-stamping of 22MnB5 sheet material are numerous, for example: A- or B-pillars; front or rear bumper beams; door sills; side-rail parts; tunnels; door beams or roof rails. These types of structural components have ultimate yield stress strength of 1500 MPa to 1700 MPa, elongation of five per cent to nine per cent and thickness of 1.5 mm to 2.5 mm.Hot stamping technology is a temperature and time dependent process and consists of several steps: heat treatment and austenitisation by continuous- or batch-type furnaces, transfer from the furnace to the press and the deep drawing dies, hot plastic deformation and quenching in closed cool dies.Each of these steps has to be optimised to get parts with excellent product quality and highly economical process efficiency. On one hand this optimisation requires basic knowledge of the scientific background (that is, heat treating, quenching and plastic deformation of boron steel). It also needs practical experience and expertise in press building and tooling design to meet customers’ demands with regard to hot stamping technology. Neff has 60 years experience of building hydraulic presses, ranging from 2.5 tonnes to 2,500 tonnes.The first step consists of heating blanks until total austenitisation is achieved. By means of this the ferritic microstructure of blank material at room temperature is transformed to a completely austenitic one. This change of microstructure is time dependent and usually needs a dwell time of four to 10 minutes. Microstructure transformation starts at the lower critical temperature Ac1 and finishes as soon as the upper critical temperature Ac3 is achieved. There exists some well-known empirical equations for estimating the amount of Ac1 and Ac3. By doing this, an Ac1 temperature of about 700°C and an Ac3 temperature of about 800°C is obtained for the boron steel material used. But more precise knowledge of these critical temperatures is dependent on knowing the detailed chemical composition of the steel alloy that is used by the production of the blank material.