Effect of heat treatment on the banded structure of a hot-rolled 30CrMo steel

2016 ◽  
pp. 91-94
Author(s):  
M Wang ◽  
G Xu ◽  
Y Zhang ◽  
L Wang
Keyword(s):  
Heat Treatment ◽  
Banded Structure ◽  
Hot Rolled

Network Carbide Inheritance during Heat Treatment Process of Large Shield Machine Bearing Steel GCr15SiMn

2015 ◽  
Vol 817 ◽  
pp. 115-120 ◽  
Author(s):  
Dan Zhang ◽  
Le Yu Zhou ◽  
Chao Lei Zhang ◽  
Chao Huang ◽  
Min Zhao ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Treatment Process ◽  
Bearing Steel ◽  
Treatment Temperature ◽  
Heat Treatment Process ◽  
Soaking Time ◽  
Hot Rolled ◽  
Chinese Standard ◽  
Shield Machine ◽  
Quenching And Tempering

Network carbide inheritance during heat treatment process of large shield machine bearing steel GCr15SiMn was investigated by heat treatment experiments and quantitative metallographic. Samples with the proeutectoid cementite network thickness in the range of 0.19~0.54 μm were obtained by changing austenitizing temperature and soaking time of pearlite transformation. The results show that the network in hot rolled bar can be improved when the pre-heat treatment temperature is 950 °C. When the network thickness is above 0.40 μm, the undissolved cementite networks present in microstructures after quenching and tempering. In a Chinese standard, the network grades are 1.5 and 3.0 degree when the networks thickness are 0.40 μm and 0.54 μm, respectively. The critical network thickness that can be eliminated by heat treatment is 0.29 μm.

The Method of Eliminating Banded Structure and the Effects of Banded Structure on the Transverse Properties in 20G Steel

2013 ◽  
Vol 347-350 ◽  
pp. 1171-1175 ◽  
Author(s):  
Bin Wang ◽  
Hong Mei Hu ◽  
Cui Zhou
Keyword(s):  
Heat Treatment ◽  
Grain Size ◽  
Stress Concentration ◽  
Base Metal ◽  
Metallic Inclusion ◽  
Banded Structure ◽  
Grain Sizes ◽  
Fine Grain ◽  
Treatment Processes ◽  
Metallic Inclusions

The transverse properties were inferior to the longitudinal properties for the existence of banded structure in 20G steel. In order to eliminate the banded structure and improve the transverse performance of 20G steel, different heat treatment processes were adopted. The results showed that conventional normalizing could reduce the banded structure and refine the grain sizes. When 20G was heated with 10°C/min heating rated and then held at 920°C for 2h, the banded structure in the steel was almost eliminated and the microstructure was homogeneous with fine grain size, the strength increased by 14%. The non-metallic inclusion and carbide in the microstructure leaded to stress concentration and separation with the base metal. To some extent, heat treatment can improve the distribution and form of non-metallic inclusions.

Mechanized line for heat treatment of hot-rolled tubes 30?102

Metallurgist ◽  
1973 ◽  
Vol 17 (2) ◽  
pp. 129-130
Author(s):  
A. Ya. Zelikovich ◽  
O. A. Shcherbina ◽  
V. P. Pavlovskii ◽  
V. I. Krivosheev
Keyword(s):  
Heat Treatment ◽  
Mechanized Line ◽  
Hot Rolled

Study on the Heat-Treatment of Clad Plate for Cutting Tools

2013 ◽  
Vol 401-403 ◽  
pp. 916-919
Author(s):  
Lin Lin Yuan ◽  
Jing Tao Han ◽  
Jing Liu
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Cutting Tools ◽  
High Hardness ◽  
Core Layer ◽  
Water Cooling ◽  
Treatment Processes ◽  
Uniform Microstructure ◽  
Hot Rolled ◽  
Cutting Tool Materials

High sharpness, abrasion resistance, superior ductility, and processability are required in cutting tool materials application. Used 304(0Cr18Ni9) austenitic stainless steel as cladding and 440(7Cr17) martensitic stainless steel as core layer to produce excellently combined stainless steel plate by hot-rolled bonding in this investigation as well as researched various heat treatment processes. The results indicated that the core layer has high hardness and the cladding layer has tiny and uniform microstructure by the method of heating at 10501070°C for 15 minutes, water-cooling , then tempering at 200°C.

Effect of Heat Treatment in Pipe Processing Stage on Corrosion Resistance of Micro-Alloyed Steel Hot-Rolled Products

Metallurgist ◽  
2020 ◽  
Vol 64 (3-4) ◽  
pp. 322-333
Author(s):  
I. G. Rodionova ◽  
A. V. Amezhnov ◽  
D. V. Kudashov ◽  
V. V. Naumenko ◽  
D. L. D’yakonov ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Alloyed Steel ◽  
Processing Stage ◽  
Micro Alloyed Steel ◽  
Pipe Processing ◽  
Hot Rolled

Effect of Heat Treatment in the Structure and Microstructure of Ti-15Zr-XMo Alloys

2015 ◽  
Vol 365 ◽  
pp. 305-310 ◽  
Author(s):  
Diego Rafael Nespeque Correa ◽  
Pedro Akira Bazaglia Kuroda ◽  
M.L. Lourenço ◽  
Carlos Roberto Grandini
Keyword(s):  
Heat Treatment ◽  
Theoretical Prediction ◽  
Titanium Alloys ◽  
Molecular Orbital ◽  
Orbital Method ◽  
Molecular Orbital Method ◽  
Industry Applications ◽  
Hot Rolled ◽  
Structure And Microstructure

Titanium alloys present favorable properties to industry applications that depend on their composition and microstructure. Adding alloy elements and thermomechanical treatments can change the microstructure of titanium alloys. In this paper, Ti-15Zr alloys with different molybdenum quantities were prepared and hot-rolled, having been previously subjected to homogenizing heat treatment. The results showed that the microstructure of the alloys was sensible to heat treatment, in accordance with the theoretical prediction from the molecular orbital method.

High-Tensile Steel Bar Remained Heat Treatment Intensifying Effect and Oxide Layer Anti-Corrosion Research

2014 ◽  
Vol 1004-1005 ◽  
pp. 812-816
Author(s):  
Zhao Hui Zhang ◽  
Wei Ming Kong ◽  
Fu Cai Zhao
Keyword(s):  
Heat Treatment ◽  
Oxide Layer ◽  
Influence Factor ◽  
Steel Production ◽  
Strengthening Mechanism ◽  
Surface Oxide ◽  
Surface Oxide Layer ◽  
Strengthening Effect ◽  
Steel Bar ◽  
Hot Rolled

The surface of hot rolled ribbed steel bar after remained-heat-treatment process readily corrodes and rusts on store and transportation process due to falling off of the surface of its oxide layer in the steel production. By studying different cooling intensity having what effect on rebar structure, mechanical property and the thickness and component of surface oxide layer, this paper analyses the influence factor of strengthening mechanism and anti-corrosion on the surface oxide layer of hot rolled ribbed steel bars (HRB). The result indicates that there is a certain extent improvement on the bar’s yield strength and strength of extension after remained heat treatment, and that this change in large size bar is more distinct than which in small size’s. The most distinct strengthening effect happens in a temperature on cooling table about 720°C. Above 820°C —the temperature on cooling table, all metallographic structure consist of ferrite and pearlite (F+P); under 725°C, the sclerotic structure like bainite appears. With the temperature on cooling table arising, surface oxide layer thickens. In low temperature on cooling table, the sample integrates with matrix comparatively closely and has relatively better anti-corrode property.

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