Effects of Finish Rolling Temperature and Deformation on Microstructural Evolution and Precipitation Behavior of Non‐quenched and Tempered Carbide‐Free Bainitic Steel

2020 ◽  
Vol 92 (1) ◽  
pp. 2000221
Author(s):  
Xi Chen ◽  
Zhanbing Yang ◽  
Fuming Wang ◽  
Changrong Li
Keyword(s):  
Microstructural Evolution ◽  
Rolling Temperature ◽  
Bainitic Steel ◽  
Precipitation Behavior ◽  
Finish Rolling Temperature ◽  
Finish Rolling

Microstructure Influenced by Controlled Rolling, Cooling and Thermal Processing of Seamless Tubes Made of Steel 25CrMo4

2020 ◽  
Vol 405 ◽  
pp. 121-126
Author(s):  
Petr Kawulok ◽  
Ivo Schindler ◽  
Stanislav Rusz ◽  
Rostislav Kawulok ◽  
Petr Opěla ◽  
...  
Keyword(s):  
Wall Thickness ◽  
Controlled Rolling ◽  
Rolling Temperature ◽  
Compression Tests ◽  
Structural Variations ◽  
Finish Rolling Temperature ◽  
Finish Rolling ◽  
Physical Simulations ◽  
Plain Strain ◽  
Quenching And Tempering

By use of physical simulations, it was studied the influence of finish rolling temperature (from 820 °C to 970 °C) on the microstructural and mechanical properties of seamless tubes with a different wall thickness (from 6.3 to 40 mm) – in the state after rolling as well as after quenching and tempering. In laboratory conditions, by use of the Simulator HDS-20, the bloom piercing and rolling of the seamless tubes from 25CrMo4 low-alloy steel in a pilger mill were in a simplified way simulated. The wall thickness of the tube influenced the total deformation of specimens at anisothermal multi-pass plain-strain compression tests as well as the final cooling rate. The quenching and tempering of the deformed specimens was subsequently performed with use of the electric resistance furnaces. The finish rolling temperature had only insignificant effect on the resulting properties. Markedly lower hardness was obtained only after the simulation of tube production with the wall thickness of 40 mm contrary to the wall thickness of 6.3 and 20 mm. Structural variations of the specimens after rolling simulations were more or less overlapped by the subsequent quenching from the temperature of 850 °C and tempering at the temperature of 680 °C.

Reason Analysis and Solutions of Low Coiling Temperature at Tail of ZSAC1 Strip during U-Type Cooling

2014 ◽  
Vol 988 ◽  
pp. 290-295
Author(s):  
Zhi Min Zhang ◽  
Feng Qin Wang ◽  
Fei Li ◽  
Shu Zhi Wang ◽  
Xiao Jiang
Keyword(s):  
Rolling Speed ◽  
Rolling Temperature ◽  
Cooling Process ◽  
Coiling Temperature ◽  
Running Speed ◽  
Factors Affecting ◽  
Finish Rolling Temperature ◽  
Finish Rolling ◽  
Improve Accuracy ◽  
Main Factors

Coiling temperature, finish rolling temperature and running speed of ZSAC1 strip during U-type cooling and number of valves which had been turned on were analyzed in order to find out the reason of low coiling temperature at tail of ZSAC1 strip in U-type cooling process. Results of research showed that running speed of strip and finish rolling temperature were main factors affecting accuracy of coiling temperature. Coiling temperature decreased with the increase of running speed of strip. Coiling temperature fluctuation would occur at the same part of strip when finish rolling temperature increased or decreased. Holding rolling speed and rolling temperature of strip stably can improve accuracy of coiling temperature during downstream U-type cooling.

Laboratory Controlled Rolling of Microalloyed Steel for Production of Seamless Tubes

2016 ◽  
Vol 258 ◽  
pp. 611-614 ◽  
Author(s):  
Petr Kawulok ◽  
Radek Jurča ◽  
Ivo Schindler ◽  
Stanislav Rusz ◽  
Rostislav Turoň ◽  
...  
Keyword(s):  
Wall Thickness ◽  
Hsla Steel ◽  
Tensile Tests ◽  
Strength Properties ◽  
Controlled Rolling ◽  
Rolling Temperature ◽  
Plastic Properties ◽  
Finish Rolling Temperature ◽  
Finish Rolling ◽  
Rolling Temperatures

Using the laboratory rolling mill with smooth rolls, piercing, as well as rolling in a pilger mill of the seamless tubes with diameter 273 mm from the HSLA steel microalloyed with vanadium steel was simulated. Influence of the wall thickness (6.3 – 40 mm) and finish rolling temperature on the final structural and mechanical properties was investigated. Necessary temperatures of the phase transformations in the course of cooling were determined by dilatometric tests. Based on the dilatometry results, finish rolling temperatures were reduced. Lower rolling temperatures yielded in a relative grain refinement. Effect of the finish rolling temperature did not have any marked impact on the tensile tests results. Strength properties decreased only slightly with the increasing wall thickness and the plastic properties were not influenced significantly by this parameter. The positive effect of the reduced finishing temperature appeared markedly in the results of impact tests performed at room temperature only. Notch toughness was increased by approx. 25 % in the case of the wall thickness of not less than 20 mm.

Thermal-Mechanical Simulation of the Controlled Rolling and Cooling Process by Orthogonal Design for Pipeline Steel

2012 ◽  
Vol 557-559 ◽  
pp. 2355-2360 ◽  
Author(s):  
Min Jiang ◽  
Li Na Chen ◽  
Wei Pang ◽  
Chong He Li ◽  
Xiong Gang Lu
Keyword(s):  
Cooling Rate ◽  
Heating Temperature ◽  
Pipeline Steel ◽  
Great Influence ◽  
Control Process ◽  
Controlled Rolling ◽  
Rolling Temperature ◽  
Cooling Temperature ◽  
Finish Rolling Temperature ◽  
Finish Rolling

A novel pipeline steel was prepared by the vacuum inducting technology, using Gleeble-3500 hot simulator, its parameters of thermo-mechanical control process (TMCP), such as heating temperature, finish rolling temperature, finish cooling temperature and cooling rate, have been studied by the orthogonal experiment with four factors and three levels. Through the orthogonal theoretical analysis, it is found that the sequence of the effect of parameters on the mechanical property is: Cooling rate > Heating temperature > Finish cooling temperature > Finish rolling temperature, the cooling rate is the most important factor affecting the inspection target and possesses a great influence on the hardness of the pipeline steel.

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