Novel Hot-Rolled Structural Plate Steels with Yield Strength of 700 Mpa and Excellent Usability

2018 ◽  
Vol 941 ◽  
pp. 170-175
Author(s):  
Ville Ritola ◽  
Juha Pyykkönen ◽  
David Martin ◽  
Pasi Suikkanen ◽  
Magnus Carlsson
Keyword(s):  
Yield Strength ◽  
Optimization Method ◽  
Rolling Process ◽  
Controlled Rolling ◽  
Rolled Plate ◽  
The Novel ◽  
Austenite Grain Size ◽  
Hot Rolled ◽  
The Impact ◽  
Plate Steels

Hot rolled structural plate steels with yield strength of 700 MPa are an excellent choice for a variety of demanding applications that require excellent toughness and welding properties. SSAB has developed novel hot-rolled plate steels that are produced using precision controlled rolling and an innovative cooling and tempering strategy that ensures invariable mechanical properties in the width and the length directions of the plate. The recently developed steel meets or exceeds the requirements of EN 10025-6 for the S690QL grade. The minimum yield strength (ReH) is between 630 MPa and 690 MPa depending on plate the thickness, and the interval of tensile strength is 760 - 940 MPa, while the minimum elongation at fracture is 14 %. Further, an impact energy of 69 J at-40 °C on transverse V-notch specimen is guaranteed. The novel grades represent superior bendability and surface quality, weldability with excellent HAZ strength and toughness with very low CET and CEV values, exceptional consistency of properties within a plate guaranteed by close tolerances. In addition to the excellent formability, the novel hot rolled steels exhibit greatly improved toughness properties which provides for good resistance to fracture. These outstanding properties are achieved through carefully controlled manufacturing processes. In the present study, a sophisticated recrystallization based hot rolling process optimization method is presented. With the final aim to improve the impact toughness of the novel steel, recrystallization analyses and modelling of austenite grain size development through the rolling pass schedule is performed.

Effect of Controlled Rolling on Mechanical Property and Microstructure of Nb Microalloyed H Beam

2011 ◽  
Vol 399-401 ◽  
pp. 1654-1657
Author(s):  
Min Zhu ◽  
An Chao Ren ◽  
Yu Ji
Keyword(s):  
Grain Size ◽  
Heating Temperature ◽  
Charpy Impact ◽  
Rolling Process ◽  
Controlled Rolling ◽  
American Petroleum Institute ◽  
Offshore Platforms ◽  
Austenite Grain Size ◽  
H Beam ◽  
Hot Rolled

Precipitated phase of microalloyed H beam was analysed by TEM and electrolyzation. Effect of heating temperature on austenite grain size and solid solution of Nb in steel and effect of finishing rolling temperature on property of tested steel were studied. According to the results, controlled rolling process was determined to produce the hot-rolled. Property of H beam includes that yield strength is 410MPa~430MPa, and charpy impact energy at -20°C is greater than 50J. The ferrite grain size number is 11. All of the properties are up to the American Petroleum Institute standard of H beam for offshore platforms.

Correlation among Microstructure, Texture, and Properties along the Thickness Direction in As-Hot-Rolled and As-Solution-Quenched Al7055 Thick Plates

2021 ◽  
Vol 1026 ◽  
pp. 65-73
Author(s):  
Kai Zhu ◽  
Hong Wei Yan
Keyword(s):  
Mechanical Properties ◽  
Yield Strength ◽  
Tensile Tests ◽  
Rolled Plate ◽  
Uniaxial Tensile ◽  
Thickness Direction ◽  
Electron Backscattered Diffraction ◽  
Thick Plates ◽  
Aluminum Plates ◽  
Hot Rolled

Both microstructure inhomogeneity and mechanical property diversity along the thickness direction in rolled thick aluminum plates have been considered to have a remarkable impact on the performance and properties of the products made from the plates. In this study, scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD) characterizations of microstructure and texture types along the thickness directions of Al7055 thick plate specimens prepared using two conditions, hot-rolling and solution-quenching, were performed. To examine the mechanical properties, uniaxial tensile tests were also carried out on specimens machined from both types of thick plates, using a layered strategy along the thickness direction. The results indicate that both the microstructure and mechanical properties are inhomogeneous under the two conditions. Furthermore, it is evident that there is a hereditary relationship between the mechanical properties of the two plates—areas with higher yield strength in the as-hot-rolled plate correspond to areas with the higher yield strength in the as-solution-quenched plate

Metallurgical Effects of a Novel Tundish Refining Process for High-Strength Low-Alloy Hot-Rolled Plate Steels

Metallurgist ◽  
2016 ◽  
Vol 59 (9-10) ◽  
pp. 980-986 ◽  
Author(s):  
O. Isayev ◽  
V. Kislitsa ◽  
C. Zhang ◽  
K. Wu ◽  
A. Hress
Keyword(s):  
High Strength ◽  
Refining Process ◽  
Rolled Plate ◽  
Hot Rolled ◽  
Plate Steels

scholarly journals Development of Intermediate Cooling Technology and Its Control for Two-Stand Plate Rolling

2016 ◽  
Vol 2016 ◽  
pp. 1-9
Author(s):  
Fei Zhang ◽  
Wei Yu ◽  
Tao Liu
Keyword(s):  
Steel Plate ◽  
Cooling System ◽  
Chromatic Aberration ◽  
Rolling Process ◽  
Controlled Rolling ◽  
Plate Surface ◽  
Plate Rolling ◽  
Intermediate Cooling ◽  
Rolling Efficiency ◽  
The Impact

In a plate rolling production line, thermomechanically controlled processing is critical for plate quality. In this paper, a set of intermediate cooling equipment of a two-stand plate mill with super density nozzles, medium pressure, and small flow is developed. Based on a simplified dynamic model, a cooling control scheme with combined feedforward, feedback, and adaptive algorithms is put forward. The new controlled rolling process and the highly efficient control system improve the controlled rolling efficiency by an average of 17.66%. The proposed intermediate cooling system can also effectively inhibit the growth of austenite grain, improve the impact toughness and yield strength of Q345B steel plate, reduce the formation of secondary oxide scale on the plate surface and the chromatic aberration of the plate surface, and greatly improve the surface quality of the steel plate.

Critical Strain for Complete Austenite Recrystallisation during Rough Rolling of C-Mn Steel and Nb-Ti-V Microalloyed Steel

2018 ◽  
Vol 941 ◽  
pp. 46-51
Author(s):  
Dannis Rorisang Nkarapa Maubane ◽  
Charles Witness Siyasiya ◽  
Kevin Mark Banks ◽  
Waldo Edmund Stumpf
Keyword(s):  
Grain Size ◽  
Microalloyed Steel ◽  
Plain Carbon Steel ◽  
Rolled Plate ◽  
Austenite Grain Size ◽  
Nucleation Sites ◽  
First Pass ◽  
Industrial Heating ◽  
Hot Rolled ◽  
Softening Fraction

The influence of roughing strain on the extent of austenite recrystallisation in plain carbon steel and Nb-Ti-V microalloyed steel was investigated. Reheating and roughing simulations were conducted on a deformation dilatometer using industrial heating, soaking times, strain and strain rates. The roughing schedules comprised of varying the pass strain magnitude within a typical roughing temperature range. The double stroke method was used to determine the austenite softening fraction. The austenite grain size, prior to and after rolling, was measured on quenched specimens. Grain refinement was achieved in both steels after all rolling schedules. An applied pass strain of 0.15 was sufficient to completely soften the austenite after the first pass and produced the finest recrystallised grain size. This was attributed to sufficient nucleation sites and driving force for recrystallisation compared to lower strains. Partial recrystallisation occurred after the first pass due to the relatively coarse initial grain size. The steel chemistry played an insignificant role in controlling the recrystallisation kinetics at high roughing temperatures. The through-thickness strain distribution calculated from FEM simulations showed that, for a given applied strain, a similar magnitude of deformation is achieved at the centre of a hot-rolled plate.

Bright Line Defects of Hot Rolled Plate for 2205 Duplex Stainless Steel

2013 ◽  
Vol 470 ◽  
pp. 15-18
Author(s):  
Hui Zhang ◽  
Yong Jun Zhang ◽  
Jing Tao Han ◽  
Yuan Dong ◽  
Jie Ren Hu
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Hot Rolling ◽  
Rolling Process ◽  
Rolled Plate ◽  
Strip Surface ◽  
2205 Duplex Stainless Steel ◽  
Bright Line ◽  
Line Defects ◽  
Hot Rolled

In hot rolling process of 2205 duplex stainless steel, it was found that bright line defects are mainly located at where is about distance of 200 mm from two sides of hot rolled plate. The forming reason of bright line defects is studied by means of metallographic microscope, scanning electron microscope (SEM) combined with energy dispersive spectrometer (EDS). It is concluded that the formation of bright line defects has associated with sticking and that the temperature reduction on the edge of hot rolling plate causes a high percentage of austenite phase which is network structure. In order to prevent or avoid the happening of the sticking phenomenon, it is necessary to uniformly distribute the oxide on the strip surface by controlled rolling process.

Research Regarding the Development of Manufacturing of Electrical Welded Pipes from Micro-Alloy Steel with Good Weldability and Toughness

2015 ◽  
Vol 1128 ◽  
pp. 261-268 ◽  
Author(s):  
Petru Simion ◽  
Vasile Dia ◽  
Gabriela Hrițuleac ◽  
Ioan Hrițuleac ◽  
Corneliu Munteanu
Keyword(s):  
Experimental Research ◽  
Mechanical Characteristics ◽  
Phosphorus Content ◽  
Weld Seam ◽  
Maximum Level ◽  
Rolling Process ◽  
Niobium Content ◽  
Second Stage ◽  
Hot Rolled ◽  
The Impact

Obtaining welded pipes with a superior toughness and plasticity of weld seam is strictly related to the properties of steel utilized in manufacturing welded pipes and firstly to its weldability. As a consequence, experimental research has been focused on obtaining steel with a lower equivalent carbon content but presenting high toughness and plasticity properties. In order to compensate for the decreased mechanical strength of the steel caused by reducing the carbon and manganese contents, in the first stage micro-alloying has been applied with niobium (0.040-0.055 % wt. Nb) to a construction steel, with a reduced content of carbon and manganese. The results of the mechanical characteristics obtained on hot rolled coil were good, but in the cold rolling process of pipes, the toughness characteristics have decreased excessively due to severe cold working characteristics of this steel. The second stage of experimental research has utilized microalloying with titanium (0.015-0.025 % wt. Ti), simultaneously with reducing the niobium content to a maximum level of 0.030% wt. Nb. Also, in order to reduce the cold brittleness of the steel, the maximum phosphorus content has been limited to 0.010 % wt. It was obtained excellent results with respect to the material toughness (evaluated by the impact test on KV specimen), the toughness value going up from 30-40 Joules to 150-180 Joules, while maintaining the excellent results previously obtained for steel weldability as well as the overall mechanical characteristics.

Study on the Prediction of Rolling Force of 16MnR Hot Rolled Plate

2013 ◽  
Vol 753-755 ◽  
pp. 163-166
Author(s):  
Xiao Long Li ◽  
Ying Li Wei ◽  
Yuan Zhang ◽  
Ya Qiang Tian ◽  
Jin Ying Song ◽  
...  
Keyword(s):  
Rolling Force ◽  
Process Analysis ◽  
Rolling Process ◽  
Rolled Plate ◽  
Process Equipment ◽  
Traditional Concept ◽  
Steel Rolling ◽  
Hot Rolling Process ◽  
Rolling Load ◽  
Hot Rolled

Considering the insufficient recrystallization of austenite has an effect on deformation resistance, meanwhile, referring to the plate of controlling parameters in the hot rolling process, analysis and forecast of load parameters of rolling mill and motor per pass of its rolling process. The result shows that: The production of modern steel rolling, involved in the process, equipment problems associated with rolling load, must be taken into account in its internal organization of metal in the deformation process. The less recrystallization is, the greater the deviation of the calculated results. This should be distinguished from the traditional concept of rolling.

scholarly journals Simulation and Experimental Study on the Inhomogeneity of Mechanical Properties of Aluminum Alloy 7050 Plate

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 515
Author(s):  
Hai Gong ◽  
Xuan Cao ◽  
Yaoqiong Liu ◽  
Yunxin Wu ◽  
Fangmin Jiang ◽  
...  
Keyword(s):  
Grain Size ◽  
Aluminum Alloy ◽  
Yield Strength ◽  
Rolling Process ◽  
Rolled Plate ◽  
Alloy Plate ◽  
7050 Aluminum Alloy ◽  
Result Show ◽  
Aluminum Alloy Plate ◽  
The Difference

In this work, the finite element method simulated the symmetrical hot rolling process of 7050 aluminum alloy plate. The simulation result show that different thickness layers of 7050 aluminum alloy plate experienced different temperature and strain history in the rolling process, which leads to the difference of recrystallization fraction along the thickness direction and affects the distribution of grain size. The grain size of 7050 aluminum alloy rolled plate was obtained by the metallographic test, which was in good agreement with the simulation result. The true stress-strain curve and yield strength of 7050 aluminum alloy were acquired by hot compression test. Subsequently, a prediction model of yield strength was constructed based on the Hall–Patch relationship. The result show that the predicted inhomogeneity reached 8.7%, and the difference was about 5.3% compared with that of the experimental value.

Effects of Finishing Rolling Temperature on the Microstructural Behavior for Fe-0.1C Steel as a Function of Niobium Content

2007 ◽  
Vol 26-28 ◽  
pp. 55-60 ◽  
Author(s):  
Nam Hyun Kang ◽  
Inae Park ◽  
Jong Won Jin ◽  
Sang Ho Byun ◽  
Young Jung Lee ◽  
...  
Keyword(s):  
Grain Size ◽  
Impact Toughness ◽  
Rolling Process ◽  
Controlled Rolling ◽  
Rolling Temperature ◽  
Microstructural Investigation ◽  
Niobium Content ◽  
Nb Content ◽  
Microstructural Behavior ◽  
The Impact

The demand to replace Fe-V steel with Fe-Nb steel is evolving because of high costs of raw vanadium material. For the mass production of Fe-Nb steel, the most critical barrier is a poor impact toughness comparing with that of Fe-V steel. This study covers a microstructural investigation for ferrite grain size to explain the strength and toughness results as a function of V and Nb contents. The steel samples were made of three different compositions, i.e., Fe-V steel (Fe-0.05V-0.001Nb), Fe-V-Nb steel (Fe-0.014V-0.03Nb), and Fe-Nb steel (Fe-0.003V-0.033Nb). Rolling temperature to initiate was 1150°C for the all experiments. However, rolling temperature to finish was set differently for two conditions; 950°C and 860°C. The rolling to 860°C decreased the grain size for the ferrite phase and increased the impact toughness rather than the case of 950°C. The Fe-V-Nb steel exhibited similar value of the impact toughness with that for the Fe-V steel because of the low rolling temperature to finish, i.e., 860°C. The whole replace of V with Nb decreased the impact toughness significantly, however some extent of V content remained with Nb content showed the comparable toughness to the Fe-V steel by optimizing the controlled rolling process.

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