Mechanical Properties of 7CrMoVTiB10-10 Steel after Heat Treatment

2014 ◽  
Vol 782 ◽  
pp. 133-136
Author(s):  
Milan Mojžiš ◽  
Lucia Domovcová ◽  
Michal Weiss ◽  
Martin Fujda ◽  
Ľudovít Parilák
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Hot Rolling ◽  
Steel Grade ◽  
Steel Tubes ◽  
Optimum Heat ◽  
Seamless Steel Tubes ◽  
Microalloying Elements ◽  
Optimum Heat Treatment ◽  
Seamless Steel

Steel 7CrMoVTiB10-10 is a Cr-Mo medium alloy steel with addition of vanadium and titanium as microalloying elements and with further addition of boron. The resulting microstructure after the heat treatment takes the form of a tempered bainite. In hot rolling of seamless tubes using this particular steel grade, it is very important to find the optimum heat treatment parameters in order to obtain the final mechanical properties according to STN EN 10216-2+A2. In this paper, various optimization concepts regarding temperature and time of tempering are being presented. Results obtained were utilized in production of seamless steel tubes in Železiarne Podbrezová.

Prediction of Mechanical Properties of Seamless Steel Tubes Using Artificial Neural Networks

2020 ◽  
Vol 19 (04) ◽  
pp. 2050028
Author(s):  
Ramon Santos Correa ◽  
Patricia Teixeira Sampaio ◽  
Rafael Utsch Braga ◽  
Victor Alberto Lambertucci ◽  
Gustavo Matheus Almeida ◽  
...  
Keyword(s):  
Neural Network ◽  
Mechanical Properties ◽  
Sampling Rate ◽  
Steel Tube ◽  
Support Vector ◽  
Neural Network Models ◽  
Steel Tubes ◽  
Inference Models ◽  
Seamless Steel Tubes ◽  
Seamless Steel

A bottleneck of laboratory analysis in process industries including steelmaking plants is the low sampling rate. Inference models using only variables measured online have then been used to made such information available in advance. This study develops predictive models for key mechanical properties of seamless steel tubes, by strength, ultimate tensile strength and hardness. A plant in Brazil was used as the case study. The sample sizes of some steel tube families given namely, yield a particular property are discrepant and sometimes very small. To overcome this sample imbalance and lack of representativeness, committees of predictive neural network models based on bagging predictors, a type of ensemble method, were adopted. As a result, all steel families for all properties have been satisfactorily described showing the correlations between targets and model estimates close to 99%. These results were compared to multiple linear regression, support vector machine and a simpler neural network. Such information available in advance favors corrective actions before complete tube production mitigating rework costs in general.

Recrystallization and Mechanical Properties of Hot Rolled Seamless Steel Tubes

2007 ◽  
Vol 558-559 ◽  
pp. 1107-1113
Author(s):  
Tibor Kvačkaj ◽  
Michal Zemko
Keyword(s):  
Mechanical Properties ◽  
Carbon Steels ◽  
Structure Evolution ◽  
Chemical Compositions ◽  
Low Carbon ◽  
Steel Tubes ◽  
Strain And Strain Rate ◽  
Prediction Of Mechanical Properties ◽  
Seamless Steel Tubes ◽  
Seamless Steel

The article deals with FEM analysis, with mathematical modeling of structure evolution and with prediction of mechanical properties during hot rolling of seamless steel tubes. With use of DEFORM 3D software the present state of stretch-reducing mill of Železiarne Podbrezová, Inc was described. The next part of article presents mathematical model describing the tube production for low carbon steels grade St52 on analyzed calibration sequence. Values of temperature, strain and strain rate from FEM simulation were substituted into the mathematical models of recrystallization, grain growth, transformation and prediction of mechanical properties. The calculated values were compared with experimental ones resulting from mechanical tests of industry rolled tubes of various chemical compositions. Good correlation of structural and mechanical properties was achieved for all chemical compositions and treatment conditions.

Microstructural and Magnetic Improvements in Tube-Cast Pr-Fe-B-Cu Alloys Via Heat Treatments and Rapid Upset Forging

1999 ◽  
Vol 577 ◽  
Author(s):  
G P Hatch ◽  
A J Williams ◽  
I R Harris
Keyword(s):  
Magnetic Properties ◽  
Heat Treatments ◽  
Cast State ◽  
Steel Tubes ◽  
Cu Alloys ◽  
Upset Forging ◽  
Cast Alloys ◽  
Optimum Heat ◽  
Alternative Routes ◽  
Optimum Heat Treatment

ABSTRACTAlloys of Pr-Fe-B-Cu were cast into Cu and stainless steel tubes. It could be seen that a preferred crystallographic orientation was obtained after cooling. Fine platelets of Pr2Fe1 4B matrix phase were formed, surrounded by various grain boundary phases, and there was a significant reduction in the amount of free Fe present, in comparison to conventional slab cast alloys. In order to improve the magnetic properties in the as-cast state, two alternative routes were used. The first involved a series of two step heat treatments to develop an improved microstructure. After an optimum heat treatment of 1000 'C for 24 hours + 500°C for 3 hours, significantly improved magnetic properties were obtained for a 17.5 % Pr alloy; Br = 752 mT, Hci = 613 kAm−1 and BHmax = 96 kJm−3. The second route involved a rapid upset forging [RUF] process, with a strain rate of 11.5 s−1, to hot deform the alloys. Following post-forging heat treatments, properties of Br = 966 mT, Hci = 780 kAm−3 and BHmax = 160 kJm−3 were obtained for a 15% Pr alloy. That nature of the improvements in properties as a result of heat treatments and RUF were investigated and are discussed in the present work.

Using 2D/3D FEM Simulation to Determine Drawing Force in Cold Drawing of Steel Tubes with Straight Internal Rifling

2020 ◽  
Vol 304 ◽  
pp. 121-125
Author(s):  
Martin Necpal ◽  
Mária Kapustová ◽  
Maroš Martinkovič
Keyword(s):  
Fem Simulation ◽  
Cold Drawing ◽  
Drawing Force ◽  
Forming Process ◽  
3D Fem ◽  
Steel Tubes ◽  
Cold Forming ◽  
Cold Draw ◽  
Seamless Steel Tubes ◽  
Seamless Steel

The most comprehensive steel tube portfolio is used to produce all kinds of modern energy production and the corresponding auxiliary unit such as boilers and heat exchangers. Multi-rifled seamless steel tubes are distinguished by maximum pressure, heat resistance, strength and durability. Production of multi-rifled seamless steel tubes by cold draw process using multi-rifled mandrel is quite a new technology. Shape and dimension of the drawing tool depend on drawing tube reduction degree, i. e. on the original diameter of the initial tube and final diameter of the tube. The technology of drawing tubes is influenced by process parameters, dimensions of tools and cold forming process conditions. Optimization of the whole forming process naturally involve the FEM analyses and simulation. One of the most important information of the cold drawing process is the load stroke of the tools. The contribution is concerned at the usability of FEM simulation on an evaluation of cold draw forming process condition and prediction of load stroke of the forming tools. DEFORM 2D/3D FEM software is used to compare the result of the drawing force and to determine the appropriate methodology to set FEM simulation of cold forming.

Sign in / Sign up

Export Citation Format

Share Document