Controlled cooling of coils of high-carbon and alloy structural steel

2010 ◽  
Vol 40 (2) ◽  
pp. 153-156 ◽  
Author(s):  
V. V. Chashchin
Keyword(s):  
Structural Steel ◽  
High Carbon ◽  
Controlled Cooling

Design on the Bearing Forging Spray Cooling Control Device

2013 ◽  
Vol 300-301 ◽  
pp. 1467-1470
Author(s):  
Hong Bing Huang ◽  
Yong Ming Wang ◽  
Ying Qiu Sun
Keyword(s):  
Spray Cooling ◽  
Bearing Steel ◽  
Control Device ◽  
High Carbon ◽  
Controlled Cooling ◽  
Cooling Device ◽  
Slow Cooling ◽  
Cooling Method ◽  
Cooling Speed ◽  
Temperature Area

At present the spray cooling method is used to the high carbon chrome bearing steel in the forging process. The traditional manual method of spray cooling controlling easily cause the slow cooling speed and uneven. Especially above 850 degrees Celsius, it is possible to produce reticular carbide which affects the bearing service life. According to the shortage of the existing technology, the paper design a kind of bearing forging controlled cooling device which can accurately control the spray cooling mainly consisted of delivery area, spray area, soak area and measuring temperature area. This device can complete spray cooling, soaking, measuring temperature, and other functions, effectively solves bearing forging spray cooling accurate controlling problem.

scholarly journals RATIONALE FOR CONTROLLED COOLING PARAMETERS HIGH CARBON ROLLED STEEL IN WIRE MILL STREAM 320/150 JSC «MSW»

2016 ◽  
Vol 2 (77) ◽  
pp. 62-70
Author(s):  
Эдуард Владимирович Парусов ◽  
Александр Борисович Сычков ◽  
Светлана Ивановна Губенко ◽  
Сергей В. Долгий ◽  
Людмила Владимировна Сагура
Keyword(s):  
Rolled Steel ◽  
High Carbon ◽  
Controlled Cooling ◽  
Wire Mill

scholarly journals TECHNOLOGY OF HEAT TREATMENT OF THE LARGE SECTION BARS MADE OF STRUCTURAL STEEL USING CONTROLLED CONTINUOUS COOLING FROM THE AUSTENITE PHASE

2020 ◽  
Vol 72 (1) ◽  
pp. 2-20
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Structural Steel ◽  
Hot Rolling ◽  
Accelerated Cooling ◽  
Controlled Cooling ◽  
Treatment Technology ◽  
Heating And Cooling ◽  
Air Stream ◽  
The Impact

The article presents the results of studies on the impact of accelerated cooling after the austenitisation of bars with a diameter of 180 mm made of structural steel S355J2 on the microstructure and mechanical properties. The aim of the research was to develop basic parameters of heat treatment technology using the heat remaining in the bars after hot rolling. Tests of heating and cooling of the bars were carried out in devices included in the line for semi-industrial hot rolling simulation, controlled cooling and heat treatment (LPS-B) at Łukasiewicz – IMŻ. The following cooling operations were performed after bar austenitisation: cooling in still air, controlled cooling with air blow, water-air mixture, water spraying and immersion cooling in water. Based on the research and analyses, it was found that the use of optimised variants of accelerated cooling leads to the modification of the microstructure and to grain refinement, without the formation of undesirable phase components. Consequently, the mechanical properties (yield strength and impact toughness) increase above the level obtained as a result of cooling in still air, including standard normalisation. Preliminary tests of accelerated air stream cooling of bars were carried out after austenitising in industrial conditions. The final criterion for selecting and implementing the type of technology for heat treatment of bars using heat after hot rolling in Huta Bankowa’s technical and technological conditions will be the assessment of the economic efficiency of the project.

scholarly journals Development of Structural Steel Containing 3÷5 wt% Al with Microlaminated Microstructure

2017 ◽  
Vol 62 (4) ◽  
pp. 2309-2315
Author(s):  
B. Garbarz ◽  
M. Adamczyk ◽  
B. Niżnik-Harańczyk
Keyword(s):  
Structural Steel ◽  
Rolling Mill ◽  
Lamellar Microstructure ◽  
Total Elongation ◽  
Mechanical Processing ◽  
Controlled Cooling ◽  
Final Microstructure ◽  
Basic Parameters ◽  
Cooling Technology ◽  
Better Than

AbstractThe aim of this work was to develop basic parameters of hot rolling and controlled cooling technology allowing to obtain the microlaminated (lamellar) microstructure in a lean-alloy structural steel containing 3÷5 wt % Al. Thermo-mechanical rolling tests of two experimental steels were carried out in a semi-industrial line comprising a one – stand reversing rolling mill. The final microstructure of the specimens subjected to rolling in theγ+αstability region characterised with the microlaminated morphology composed of lamellae of ferrite with thickness down to 1 μm or less and lamellae or grains of phases developed during transformation of the austenite. Determined parameters of the thermo-mechanical processing allowed to achieve very attractive mechanical properties of the experimental steels: tensile strength over 1.0 GPa and ductility level (total elongation) better than 15%.

Test and Research on Controlled Cooling Technology for High Carbon High Silicon Wire Rod of S87B

2014 ◽  
Vol 989-994 ◽  
pp. 475-479
Author(s):  
Lei Zhang ◽  
Jian Lin Sun ◽  
Yan Li ◽  
Juan Cui ◽  
Fang Zhang
Keyword(s):  
Phase Transformation ◽  
Critical Temperature ◽  
Uniaxial Compression ◽  
Interlamellar Spacing ◽  
Compression Tests ◽  
High Carbon ◽  
Controlled Cooling ◽  
Cct Curve ◽  
Cooling Speed ◽  
Cooling Technology

In this paper, critical temperature of phase transformation and continuous cooling transformation (CCT) curve of S87B were determined by hot uniaxial compression tests. At several of cooling speed, the microstructures were studied. The results indicate that the critical temperature of phase transformation become lower with cooling speed increasing, the min interlamellar spacing of pearlite was 0.125μm when the cooling speed was 4°C/s, the best cooling speed of phase transformation area was during (3-4)°C/s..

Strengthening of hot-rolled high- carbon steels by copper additions and controlled cooling

1994 ◽  
Vol 30 (7) ◽  
pp. 869-873 ◽  
Author(s):  
F.A. Khalid ◽  
P. Wang ◽  
V. Jerath ◽  
D.V. Edmonds
Keyword(s):  
Carbon Steels ◽  
High Carbon ◽  
Controlled Cooling ◽  
Hot Rolled

Heat and thermomechanical treatments of high-carbon structural steel

1973 ◽  
Vol 15 (9) ◽  
pp. 729-731 ◽  
Author(s):  
Ya. R. Rauzin ◽  
E. A. Shur ◽  
P. N. Zonov
Keyword(s):  
Structural Steel ◽  
High Carbon ◽  
Carbon Structural Steel

Precipitation at the transformation interface of pearlite in steel

1990 ◽  
Vol 48 (4) ◽  
pp. 912-913
Author(s):  
F. A. Khalid ◽  
D. V. Edmonds
Keyword(s):  
Thin Foil ◽  
Carbon Steels ◽  
Model Alloy ◽  
Low Carbon ◽  
High Carbon ◽  
Growth Interface ◽  
Medium Carbon ◽  
Interphase Precipitation ◽  
Solution Treated ◽  
Wide Range

The austenite/pearlite growth interface in a model alloy steel (Fe-1lMn-0.8C-0.5V nominal wt%) is being studied in an attempt to characterise the morphology and mechanism of VC precipitation at the growth interface. In this alloy pearlite nodules can be grown isothermally in austenite that remains stable at room temperature thus facilitating examination of the transformation interfaces. This study presents preliminary results of thin foil TEM of the precipitation of VC at the austenite/ferrite interface, which reaction, termed interphase precipitation, occurs in a number of low- carbon HSLA and microalloyed medium- and high- carbon steels. Some observations of interphase precipitation in microalloyed low- and medium- carbon commercial steels are also reported for comparison as this reaction can be responsible for a significant increase in strength in a wide range of commercial steels.The experimental alloy was made as 50 g argon arc melts using high purity materials and homogenised. Samples were solution treated at 1300 °C for 1 hr and WQ. Specimens were then solutionised at 1300 °C for 15 min. and isothermally transformed at 620 °C for 10-18hrs. and WQ. Specimens of microalloyed commercial steels were studied in either as-rolled or as- forged conditions. Detailed procedures of thin foil preparation for TEM are given elsewhere.

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