scholarly journals ANALYSIS OF HEAT TRANSFER IN STEEL BILLETS DURING TRANSPORT

2018 ◽  
Vol 17 (1) ◽  
pp. 69
Author(s):  
K. N. Cançado ◽  
L. Machado ◽  
L. N. Soares
Keyword(s):  
Rolling Mill ◽  
Rolling Process ◽  
Production Costs ◽  
Steel Tubes ◽  
Transport Time ◽  
Seamless Steel Tubes ◽  
Energy Balances ◽  
Determinant Factor ◽  
Seamless Steel

During the seamless steel tubes manufacturing process, the temperature decrease between the exit of the furnace and the rolling mill entrance is determinant factor in the rolling process and the quality of the tube. This study aims to model the cooling of the billets during transport in order to evaluate the minimum temperature required for the billet leaves the furnace and also the maximum transport time without compromising the rolling process, allowing a better setup of equipment and reducing the production costs. The cooling profile was determined numerically through energy balances performed on the billet and the results obtained were compared with real values of temperature measurements by thermocouples installed on the billet. Measurements with thermocouples were conducted in billets of 270, 230 and 180 mm diameter. The error relative to the real values for all cases was below than 2.5% and the model is considered validated to use.

Improving the bore surface quality of seamless steel tubes

Metallurgist ◽  
1972 ◽  
Vol 16 (1) ◽  
pp. 53-54
Author(s):  
V. Kh. Kurilenko ◽  
A. F. Krisanov
Keyword(s):  
Surface Quality ◽  
Steel Tubes ◽  
Seamless Steel Tubes ◽  
Seamless Steel

Explorative study of tandem skew rolling process for producing seamless steel tubes

2014 ◽  
Vol 214 (8) ◽  
pp. 1597-1604 ◽  
Author(s):  
Fu-jie Wang ◽  
Yuan-hua Shuang ◽  
Jian-hua Hu ◽  
Qing-hua Wang ◽  
Jing-chao Sun
Keyword(s):  
Rolling Process ◽  
Steel Tubes ◽  
Explorative Study ◽  
Seamless Steel Tubes ◽  
Skew Rolling ◽  
Seamless Steel

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.

Production Technology for Precision Seamless Steel Tubes from the Perspective of Microhardness Changes

2016 ◽  
Vol 716 ◽  
pp. 988-993
Author(s):  
Milan Mojžiš ◽  
Martin Ridzoň ◽  
Peter Bella ◽  
Maroš Martinkovič ◽  
Ľudovít Parilák
Keyword(s):  
Cold Drawing ◽  
Pearlitic Steel ◽  
Relaxation Mechanism ◽  
Point Of View ◽  
Intermediate Annealing ◽  
Steel Tubes ◽  
Physical Point ◽  
Dislocation Hardening ◽  
Seamless Steel Tubes ◽  
Seamless Steel

The production of precision seamless steel tubes in Železiarne Podbrezová is using hot rolled tubes with multiple cold drawing passes and intermediate annealing. It utilizes intensive plastic deformation during cold drawing, taking full advantage of the microstructural state from a physical point of view. In this paper, optimization of technological processes for cold drawn tubes made from ferritic-pearlitic steel has been elaborated. We use microstructural and substructural analysis, dislocation hardening theory and stress analysis. The subject of this article is the experiment with multiple drawing passes and intermediate annealing for production of precision steel tubes with dimensions of 31.8 x 2.6 mm. The drawing itself consists of 5 processes (also called „runs“) with 7 drawing passes in total. The results presented show strain hardening of the material after drawing along with relaxation mechanism during intermediate annealing. The possibility of utilizing the microhardness values on intensity assessment of these processes is investigated, too.

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