Influence of intercritical annealing on the texture formation in low-carbon steel strips

1993 ◽  
Vol 64 (5) ◽  
pp. 262-266 ◽  
Author(s):  
Christian Klinkenberg ◽  
Dierk Raabe ◽  
Kurt Lücke
Keyword(s):  
Carbon Steel ◽  
Intercritical Annealing ◽  
Low Carbon Steel ◽  
Texture Formation ◽  
Low Carbon ◽  
Steel Strips

Development of Tensile Test to Investigate Mechanical Adhesion of Thermal Oxide Scales on Hot-Rolled Steel Strips Produced Using Different Finishing Temperatures

2011 ◽  
Vol 462-463 ◽  
pp. 407-412 ◽  
Author(s):  
Komsan Ngamkham ◽  
Satian Niltawach ◽  
Somrerk Chandra-ambhorn
Keyword(s):  
Carbon Steel ◽  
Low Carbon Steel ◽  
Ex Situ ◽  
Low Carbon ◽  
Coiling Temperature ◽  
Steel Strips ◽  
Thermal Oxide ◽  
Mechanical Adhesion ◽  
Hot Rolled ◽  
Scale Surface

The objective of this work was to carry out tensile tests to investigate the effect of finishing temperature on mechanical adhesion of thermal oxide scale on hot-rolled low carbon steel strips. Two hot-rolled low carbon steel strips were produced in an industrial hot rolling line by fixing a coiling temperature at 620 °C and varying finishing temperatures at 820 and 910 °C. Two testing methods were conducted. First, each of a number of samples was subjected to a given imposed strain with ex-situ imaging of scale surface after straining. Second, only one sample was strained in a test with ex-situ imaging of scale surface at every 2 mm elongation of the sample. A spallation ratio, an area where scale was spalled out and normalised by the total area observed by microscope, was plotted as a function of the imposed strain. These two methods gave the same tendency of results as follows. At a given strain, the spallation ratio of scale on steel produced using higher finishing temperature was larger. The gradient of spallation ratio with respect to the imposed strain of that scale was also steeper. This reflects the higher susceptibility of scale to spall out with increasing imposed strain. This behaviour might be related to the larger thickness of scale on steel produced using higher finishing temperature. For the second testing method, lowering the magnification of microscope to observe scale spallation from 50x to 20x increased R2 of the curve of spallation ratio versus the imposed strain, as well as improved the reproducibility of the test.

Effect of Intercritical Annealing Temperature and Holding Time on Microstructure and Mechanical Properties of Dual Phase Low Carbon Steel

2014 ◽  
Vol 493 ◽  
pp. 721-726 ◽  
Author(s):  
Alfirano ◽  
Wibawa Samdan ◽  
Hidayat Maulud
Keyword(s):  
Carbon Steel ◽  
Annealing Temperature ◽  
Volume Fraction ◽  
Intercritical Annealing ◽  
Low Carbon Steel ◽  
Growth Rate Constant ◽  
Dual Phase ◽  
Initial Condition ◽  
Low Carbon ◽  
Intercritical Annealing Temperature

Dual phase steels are an important advanced high strength steel, which have been widely used in the automotive industry for vehicle components requiring light weight and safety. In this study, the formation of dual phase structure with various volume fraction of martensite in a low carbon steel SS400 during intercritical annealing were investigated. It was found that intercritical annealing temperature and holding time affected the microstructure and mechanical properties of dual phase low carbon steel. The specimens were heated at intercritical annealing temperature of 750°C, 775°C, 800°C and 825°C, for holding periods of 6-18 minutes, followed by water quenching in order to get a dual phase ferrite and martensite. After quenching, it was obtained the optimal annealing conditions at 800°C with a holding periods of 10 minutes. In this condition, the tensile strength was increased up to 621 N/mm2or 39.24% higher than the initial condition, while the elongation decreased up to 13.8%. The hardness of specimens increased from 127.7 to 235.83 HVN or up to 84.67% higher than the initial condition. Meanwhile the volume fraction of martensite was 24.08%. The higher the temperature of the heating value of grain growth rate constant (K) increases. In addition, at the optimal poin, the value ofK(grain growth rate constant) andn(Avramis exponent) were 0.263 and 0.318, respectively, with activation energy (Q) of 3.98 J/mol.

Surface Characterization of Hot and Cold Rolled Low-Carbon Steel Strips after Galvanizing and Galvannealing

2007 ◽  
Vol 22 (3) ◽  
pp. 323-327 ◽  
Author(s):  
Maribel de la Garza ◽  
Martha Patricia Guerrero ◽  
Patricia Zambrano ◽  
Rafael Colás ◽  
Yvan Houbaert
Keyword(s):  
Carbon Steel ◽  
Surface Characterization ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Steel Strips ◽  
Cold Rolled

scholarly journals Comparison of Corrosion Rate on Paint Coated and Uncoated SS400 Steel

2017 ◽  
Vol 2 (1) ◽  
pp. 49
Author(s):  
Eko Hariyadi ◽  
Mohammad Jufri ◽  
Hasanuddin Hasanuddin
Keyword(s):  
Carbon Steel ◽  
Corrosion Rate ◽  
River Water ◽  
Water Solution ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Corrosion Attack ◽  
Coating Materials ◽  
Steel Strips ◽  
The Cost

To prevent corrosion in metal, especially carbon steel, always need efforts which considered expensive one. But, compared with costs and losts when the corrosion attack is not properly managed then the cost of efforts is much lower. The most popular method in preventing corrosion attack is by coating of metal which also has decorative objective. In this research, four coating materials were applied to the surface of low carbon steel strips (SS400) and as control uncoated SS400 steel strips were also employed. The steel strips then were dipped into electrolite solution consisted of 30% of consentration of H2SO4, and NaCl soluted in river water for 15 (fifteen) days. After the presetted time was elapsed, the steel strips then examined for lost of mass. It was found that the highest lost of mass was for unpolished uncoated one dipped in H2SO4 with corrosion rate of 4,566.06 mpy. The lowest lost was for paint coated one dipped in NaCl-river water solution with corroion rate of 0.64 mpy.

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