Therefore,the transformation was carried out,that is,the rolling line of Ф650mm×1/Ф550mm×1/Ф550mm×4 is disposed to semi-tandem rolling and high rigidity rolling mills is used for finish rolling etc,so the size precision of the products is increased and the size defective index is reduced to 0.25% from 0.6%.
The influence of heating temperature(1 200 ℃,1 180 ℃)of 180 mm cast slab,rolling passes for 2.3 mm hot coil(7 pass and 5 pass),finishing rolling temperature(780～860 ℃)and coil temperature(≤710 ℃)on iron loss and magnetic intensity of 0.5 mm cold rolled non-oriented silicon steel 50W600 has been tested.
Based on study of real measured data at situ, the calculated modelling of rolling stock temperature of Nb microalloyed HSLA steel during rough and finish rolling from thickness 210～250 mm slab to 3.0～8.0 mm finishing strip by 3/4 hot continuous rolling mill train including calculation to stock temperature reduction at roll table, rough rolling, finishing rolling and laminar flow cooling section has been established.
The paper introduces the main specifications, together with the configuration of equipment and advanced technology adopted of 160mm/550mm×600mm four high hydraulic finishing mill unit in Guangzhou Copper Product factory.
The input data of the program is chemical composition and rolling parameters , and the output data is austenite grain size of finish-rolling. Also, the parameters such as the fraction of recrystallization and the austenite grain size of each pass can be exported.
Based on comparision between the experiment results of three different processes,one manufacturing process that is rather appropriate and capable of meeting specification for mother tubes for finish-rolling was chosen.
Theoretical calculation of the finishing rolling impact work in non-quenched and tempered Si-Mn steel
The calculated results show that the finishing rolling impact work of the alloying non-quenched and tempered steel intensely depends on strengthening mechanisms.
The calculation formulas of the finishing rolling impact work in this paper are intergraded with the suggested ones of the finishing rolling tensile strength, yield strength, and elongation of the non-quenched and tempered steel.
Effects of finishing rolling temperatures and reduction on the mechanical properties of hot rolled multiphase steel
Effects of finishing rolling temperatures and reduction on the mechanical properties of hot rolled multiphase steel were investigated.
According to the theory of similarity, a three-dimensional simulation study on the self-vibrational characteristics of the 2050mm hot-strip finishing mill housing at Baoshan Iron and Steel Complex has been carried out.
Using the model, the possibility of the improvement in productivity by reforming the finishing mill arrangement is examined under aspect of the control of material temperature.
A looper is an uplifted device, which is always installed between adjacent stands in a hot strip finishing mill.
For the prediction of the material flow behaviour in the finishing mill more sophisticated procedures are essential, which couple the deformation of the strip and the elastic response of the rolls iteratively.
Afterwards the material undergoes further cutting by the Gegga cutters further along the site where finally it reaches the Finishing mill.
The finish-rolling temperature (FRT) was one of potential process parameters to determine strength/toughness balance of the steel manufactured by DQ process, while the effect of FRT was closely associated with the cooling rate applied in the process.
This steel was not subjected to heavy controlled rolling and the finish-rolling temperature was 760°C.
Toughness improved dramatically at finish-rolling temperatures of 955 °C (1750 °F) and below as a result of the combined effects of grain refinement and reduced precipitation hardening.
For an identical finish-rolling temperature (FRT), the plates with a high cooling rate have a higher value of σ*f than their counterparts with a low cooling rate.