Development of Direct Quenching Process for SPV490Q Steel Plate

2011 ◽  
Vol 197-198 ◽  
pp. 757-761
Author(s):  
Gui Zhi Xiao ◽  
Kuai She Wang ◽  
Fu Xian Zhu ◽  
Hong Shuang Di
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Steel Plate ◽  
Lath Martensite ◽  
Rolling Direction ◽  
Steel Plates ◽  
Low Carbon ◽  
Direct Quenching ◽  
Oil Storage ◽  
Quenching Process

SPV490Q steel is a low alloy high strength structural steel plate used in the manufacture of oil storage tank. To improve the comprehensive performance of SPV490Q steel plate and reduce manufacturing costs, direct quenching technology has been developed as revolutionary plate manufacturing technologies in recent years. Effect of direct quenching on microstructure and mechanical properties of high performance SPV490Q steel plate has been studied. The direct quenched (DQ) steel plates are rolled at different finish rolling temperatures, and their microstructures and mechanical properties are compared with those of reheat quenched (RQ) steel plate. The optical microstructure of the DQ steel shows deformed grains elongated parallel to the rolling direction, while complete equiaxed grains are visible in RQ steel. The transmission electron microscope (TEM) microstructure of the DQ steel shows refined lath martensite with high density of dislocations. The findings indicate that the application of the direct quenching process to low-carbon alloy steels contributes to the production of steel plates with excellent strength and toughness.

The Influence of Ti/N Ratio on the Effective Boron and Mechanical Properties of Low Carbon Boron Alloyed Bainitic Steel

2014 ◽  
Vol 496-500 ◽  
pp. 392-395 ◽  
Author(s):  
Tao Zhang ◽  
Hua Xing Hou ◽  
Jun Ping Chen
Keyword(s):  
Mechanical Properties ◽  
Steel Plate ◽  
Steel Plates ◽  
Bainitic Steel ◽  
Low Carbon ◽  
Obvious Effect ◽  
Ti Content

The influence of Ti/N ratio on the effective boron and mechanical properties was investigated by analyzing data from low carbon boron alloyed bainitic steel plates. The result shows Ti/N ratio varies with effective boron value. Less than 50% effective boron was obtained when Ti/N ratio is below 3.3, nearly 90% effective boron is obtained when ratio Ti/N is more than 4; Adding enough Titanium is an effective and economic way to improve qualified ratio of bainitic steel plate. The Ti content between 0.010% and 0.030% does not have obvious effect on the toughness of the bainitic steel;

Comparision of Direct Quenching and Reheat Quenching Process on Microstructure and Mechanical Properties of a High Strength Steel

2011 ◽  
Vol 287-290 ◽  
pp. 805-809
Author(s):  
Zheng Tao Duan ◽  
Yan Mei Li ◽  
Fu Xian Zhu
Keyword(s):  
Mechanical Properties ◽  
Rolling Direction ◽  
High Strength ◽  
Direct Quenching ◽  
Microstructure And Mechanical Properties ◽  
Quenching Process ◽  
Austenite Grains ◽  
Equiaxed Grains ◽  
Quenching And Tempering ◽  
Reheat Quenching

The effects of direct quenching and tempering (DQ-T) process and conventional reheat quenching and tempering (RQ-T) processes on the microstructure and mechanical properties of a high strength low alloy steel were investigated. In the as-quenched DQ steel, prior austenite grains are elongated parallel to the rolling direction, whereas the as-quenched RQ steel mainly consists of equiaxed grains; The DQ process was found to enhance the hardenability of steel effectively. The tensile strength and yield strength of DQ specimen, were higher than that of RQ specimen. In contrast, low temperature toughness of DQ-T specimen was generally inferior to that of RQ-T specimen.

Study of Direct Quenching and Tempering Process of a Low Carbon Equivalent 960 MPa Grade Steel

2013 ◽  
Vol 744 ◽  
pp. 329-333
Author(s):  
Feng Lu ◽  
Chao Wang ◽  
Yuan Yuan Li ◽  
Long Lu ◽  
Zhao Dong Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Lath Martensite ◽  
Controlled Rolling ◽  
Carbon Equivalent ◽  
Low Carbon ◽  
Tempering Temperature ◽  
Experimental Steel ◽  
Direct Quenching ◽  
Quenching And Tempering ◽  
Tempering Process

The chemical composition of a 960 Mpa grade high strength steel with low carbon equivalent was designed. Effect of direct quenching and tempering process on the microstructure and mechanical properties of the experimental steel was studied. Results showed that fine lath martensite was obtained after controlled rolling and direct quenching. With tempering temperature increasing, the mechanical properties showed different trends for different tempering stages. And this had a direct relationship with the microstructure evolution. The matrix recovery softening, carbon desolution and precipitation of nanomicroalloy carbides influenced the strength change. With increase of tempering time, the strength decreased and toughness improved. Experimental steel tempered at 450 °C for 40min could obtain the best mechanical properties, which meet the requirement with a large impact energy margin.

A Study on Grade 1000MPa High Performance Steel Plate Processing by Direct Quenching

2013 ◽  
Vol 773-774 ◽  
pp. 312-318
Author(s):  
Shu E Hu ◽  
Wei Hua Sun ◽  
Xiao Dong Liu ◽  
Feng Qiang Xiao ◽  
Deng Yi Hou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Steel Plate ◽  
High Strength ◽  
Residual Austenite ◽  
Tempering Temperature ◽  
Steel Microstructure ◽  
Direct Quenching ◽  
Ultra High Strength Steel ◽  
Grade Steel

A 1000MPa grade steel plate for coal mining machinery equipment was studied in this paper. The ultra-high strength steel plate is processed by direct quenching after hot rolling plus tempering (DQ-T) to obtain high toughness and ductility. It has found that the tempering temperature has an important influence on the steel microstructure, precipitation behavior and the plate mechanical properties. At the lower tempering temperatures from 400 °C to 450 °C, the steel plate has a low toughness. When the tempering temperature is higher than 450 °C, the higher mechanical properties can be obtained due to the carbides precipitation, dislocation dissolution and carbide decomposition from residual austenite after quenching. The steel microstructure is comprised of tempered sorbite and bainite, in which sorbite plays an important role in obtaining premium microstructure.

scholarly journals Effect of Roller Quenching on Microstructure and Properties of 300 mm Thickness Ultra-Heavy Steel Plate

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1238
Author(s):  
Jun Han ◽  
Tianliang Fu ◽  
Zhaodong Wang ◽  
Guodong Wang
Keyword(s):  
Mechanical Properties ◽  
Cooling Rate ◽  
Steel Plate ◽  
Temperature Curve ◽  
Steel Plates ◽  
Quenching Temperature ◽  
Microstructure And Properties ◽  
Testing Method ◽  
Average Grain Size ◽  
Length Direction

In this paper, a 300 mm thickness ultra-heavy steel plate was selected as the research object. In addition, special roller quenching equipment and a new testing method were used to measure the quenching temperature curve at different positions of the steel plate. The relationships and corresponding interaction mechanisms between cooling rate, microstructure, and mechanical properties of an ultra-heavy steel plate during roller quenching were investigated. The results indicated that the cooling rate, strength, hardness, and impact energy decreased gradually along the thickness direction of the plate, while the cooling rate, average grain size, and mechanical properties were relatively uniform with little change along the length direction of the plate. The experimental results provide an effective way to further control the microstructure and properties of ultra-heavy steel plates during roller quenching.

scholarly journals Development of a partition panel of an Al6061 sheet metal part for the improvement of formability and mechanical properties by hot forming quenching

2017 ◽  
Vol 9 (2) ◽  
pp. 168781401769121 ◽  
Author(s):  
Dae-Cheol Ko ◽  
Dae-Hoon Ko ◽  
Jae-Hong Kim ◽  
Joon-Hong Park
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Preliminary Test ◽  
Hot Forming ◽  
Aluminum Sheets ◽  
Heat Treated ◽  
Quenching Process ◽  
Automotive Part ◽  
Formed Part ◽  
Quench Factor Analysis

In this study, the hot forming quenching process was investigated to improve the deficiencies that arise in materials subjected to conventional cold stamping, such as low formability and undesirable mechanical properties. The hot forming quenching process was mainly discussed in terms of formability and mechanical properties in this study and was first evaluated by preliminary tests. To examine formability, an evaluation was conducted using hot-tensile and hemispherical-dome stretching tests at temperatures of 350°C and 450°C, respectively. In addition, the mechanical properties of the formed part were predicted using quench factor analysis, which was based on the cooling temperature during the die quenching process. These preliminary test results were then used to predict the formability and hardness of the partition panel of an automotive part, where the analytical results indicated high performance of the hot forming quenching process, in contrast to conventional forming. Finally, the hot forming quenching experiment of the partition panel was carried out to validate the predicted results and the obtained formability and hardness values were compared with conventional forming at room temperature using T4 and T6 heat-treated sheets. The analytical and experimental results indicate that the hot forming quenching process is a very effective method for obtaining desirable formability and mechanical properties in the forming of aluminum sheets.

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