Warm Stamping Technology of the Medium Manganese Steel. Issue 9 (4th December 2017)

• Record Type: Journal Article
• Authors: Wang, Cunyu; Li, Xiaodong; Han, Shuo; Zhang, Lei; Chang, Ying; Cao, Wenquan; Dong, Han
• Other Names: Bleck Wolfgang guestEditor.
• Is Part Of: Steel research international. Volume 89:Issue 9(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-12-04
• Subjects: Hot stamping -- Martensite -- Medium manganese steel -- Warm stamping; Steel -- Periodicals; Steel -- Metallurgy -- Periodicals; 669.142
• DOI: 10.1002/srin.201700360
• Languages: English
• ISSNs: 1611-3683

Abstract

Abstract : A kind of hot stamping technology with lower heating temperature, as named as warm stamping, is proposed based on the medium manganese steel. The differences on the microstructure and mechanical properties among 22MnB5 steel, Al–Si coated 22MnB5 steel, and medium manganese steel are studied before and after hot/warm stamping process based on industrial trail. The results show that the tensile strength of 1500 MPa is obtained for medium manganese steel when the austenitizing temperature is only 800 °C, much lower than 950 °C for 22MnB5 steel. Finer microstructure of medium manganese steel is obtained by warm stamping and there is no surface decarburization under atmosphere environment. The total elongation of warm‐stamped medium manganese steel reaches 10%, which is higher than that of 7.5% for 22MnB5 steel. The excellent hardenability makes warm‐stamped medium manganese steel more suitable for the production of large‐size components with martensitic microstructure. The results of spot welding test between medium manganese steel and H340LAD + Z show that the welding performance meets the requirement of automobile plant. Abstract : A warm stamping technology is proposed based on medium manganese steel. Two characteristics of low heating temperature and excellent hardenability of medium manganese steel are pointed out. Fine martensitic microstructure and mechanical properties of high strength and good ductility have been obtained. Warm stamping process can be applied to produce large‐size car component.