Specification for Steel, Strip, Carbon and High-Strength, Low-Alloy, Hot-Rolled, General Requirements for

2021 ◽  
Author(s):  
Keyword(s):  
Steel Strip ◽  
High Strength ◽  
Hot Rolled

scholarly journals Effect of Cr on Bainitic Transformation of Low Alloy Ultra High Strength Hot-Rolled TRIP-Type Steel Strip

2013 ◽  
Vol 54 (625) ◽  
pp. 163-169
Author(s):  
Yuji KUSUMOTO ◽  
Tatsuya SHINTOMI ◽  
Fuyuki YOSHIDA ◽  
Kazuaki HAKOMORI ◽  
Masahiko ODA ◽  
...  
Keyword(s):  
Steel Strip ◽  
High Strength ◽  
Bainitic Transformation ◽  
Type Steel ◽  
Hot Rolled

Effect of Ti on the Microstructure and Mechanical Properties of a Hot Rolled Advanced High Strength Steel Strip

2018 ◽  
Vol 941 ◽  
pp. 106-111 ◽  
Author(s):  
Ali Smith ◽  
Florian Vercruysse ◽  
Roumen Petrov ◽  
Patricia Verleysen ◽  
Bernd Linke
Keyword(s):  
Steel Strip ◽  
High Strength Steels ◽  
High Strength ◽  
Research Area ◽  
Chemical Extraction ◽  
Rolled Strip ◽  
Advanced High Strength Steels ◽  
Active Research ◽  
Hot Rolled ◽  
Ti Addition

The addition of titanium is a well-known microalloying concept for hot rolled structural steels. Concerning advanced high strength steels for the automotive sector, the use of Ti microalloying (usually with Nb-V) has been an active research area. However, Ti addition has not been explored in depth. For the current contribution, a laboratory hot rolled 0.2C-2.4Mn-1.5Si steel with and without Ti addition was studied. Mechanical testing of the hot strip revealed a very high UTS (1GPa) for the Ti added steel, whilst for the unalloyed chemistry the UTS was some 300 MPa lower. Observation of the hot rolled microstructures via optical microscopy showed a significantly higher hardenability for the Ti added steel. Moreover, X-ray diffraction analysis indicated a significant amount of retained austenite in the Ti added strip, which transformed completely to martensite after the tensile test. Further analysis via TEM and chemical extraction indicated that Ti was present both as Ti (C,N) precipitates and in solution. Finally, in light of these observations, the possible mechanisms leading to the enhanced hardenability observed for the Ti added hot rolled strip steel were discussed.

Effect of Tempering Process on Residual Stress in Hot Rolled Low Carbon Martensite High-Strength Steel Strip

2013 ◽  
Vol 690-693 ◽  
pp. 222-226 ◽  
Author(s):  
Lin Sun ◽  
Zhi Yi Zhao ◽  
Xiao Zhen Yang ◽  
Run Dong Xue
Keyword(s):  
Residual Stress ◽  
Thermal Stress ◽  
Stress Distribution ◽  
High Strength Steel ◽  
Steel Strip ◽  
High Strength ◽  
Low Carbon ◽  
Width Direction ◽  
Hot Rolled ◽  
Carbon Martensite

Distribution of residual stress in hot rolled low carbon martensite high-strength steel strip was measured by means of blind-hole method in the steel before and after tempering. The hot rolled low carbon martensite high-strength steel strip was tempered at 450°C, 500°C, 550°C or 600°C. Before tempering, the value of the residual stress along the width direction is maximum at the edge, intermediate at the center, minimum at the 1/4 of the strip. The figure of the residual stress distribution along the width direction is like the shape of the letter M. Residual stress of the strip is reduced after tempering. When tempering at 450°C or 500°C, evolution of residual stress is caused by changes of thermal stress. Distribution of residual stress becomes gentle. With tempering temperature increasing, distribution of residual stress is reversed, because evolution of thermal stress and phase transition stress changes in different time.

Research on the Precipitates in Warm-Rolled Ti-Bearing Interstitial-Free Steel Sheets

2006 ◽  
Vol 326-328 ◽  
pp. 1291-1294 ◽  
Author(s):  
Cai Nian Jing ◽  
Zuo Cheng Wang ◽  
Fu Tao Han ◽  
Wen Ping Zhang ◽  
Yan Hong Yi
Keyword(s):  
Texture Evolution ◽  
Steel Strip ◽  
High Strength ◽  
Warm Rolling ◽  
Interstitial Free ◽  
If Steel ◽  
Energy Dispersion Spectroscopy ◽  
Transmission Electron ◽  
Ferrite Region ◽  
Hot Rolled

Warm-rolling can save the production cost and extend the production kind of hot-rolled IF steel strip, the precipitates strongly influence the annealing process and texture evolution so as to the final mechanical properties of the production, very few studies has relate to the precipitates of IF steels warm-rolled in ferrite region. In present work, two Ti- IF steels were warm-rolled in ferrite region under different rolling parameters and the precipitates were investigated. Transmission electron microscopy (TEM) and Energy dispersion Spectroscopy (EDS) microanalysis were carried out on carbon extraction replicas, the characteristics such as morphology, type, amount and size of precipitates were analyzed. The results show that different type of precipitates were appeared in two steels, TiN, TiS, Ti4C2S2 and TiC were found in common Ti-IF steel, but in high strength Ti-IF steel, the amount of TiS, Ti4C2S2 was very few and FeTiP precipitates appeared, the type and morphology of precipitates were not affected by rolling parameters, however, the number and size of precipitates were changed. Finally, the effect of different P content on the change of precipitates was analyzed, the precipitating mechanism was also discussed.

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