Mathematical Model of the Accelerated Cooling of Metal in Thick-Plate Hot Rolling

Metallurgist - The paper describes the issues in predicting the consumer properties of thick-plate pipe products manufactured at the hot rolling mill 5000 of the Magnitogorsk Iron and Steel Works....     

Intercalation of Porphyrin‐Based SURMOF in Layered Eu(III) Hydroxide: An Approach Toward Symbimetic Hybrid Materials

A strategy for rational design of synergetic hybrid materials exploiting stabilization of intercalated layered matrices via coordination bonding is described. A new hybrid material is assembled through subsequent intercalation of the surface‐anchored metal–organic framework (SURMOF) components, zinc acetate and 5,10,15,20‐tetrakis(4‐carboxyphenyl)‐porphyrin‐zinc(II) (ZnTCPP), into the layered europium(III) hydroxychloride (LEuH). The formation of the SURMOF clusters intercalated in LEuH is confirmed by X‐ray diffraction, FTIR and Raman spectroscopy, and BET nitrogen absorption methods. The catalytic function of the SURMOF/LEuH hybrid and its components in the model reaction of hydrolysis of bis(4‐nitrophenyl) phosphate in the acidic solution is studied by UV–vis and MALDI‐TOF spectroscopy. Both the non‐intercalated matrix and the MOF powder are inactive and unstable in the substrate solution. Unlike its components, the SURMOF/LEuH hybrid exhibits synergetic catalytic activity increasing with the amount of the intercalated compounds because of the mutual stabilization of the components through coordination interactions. The results provide a basis for symbimetic (mimicking the symbiotic behavior in biological systems) hybrid materials, in which stabilization of functional units in the intercalated structure translates into a synergy of useful properties.     

Improvements in shot blasting to increase the surface peak density of auto-industry steel sheet

The introduction of metal curtains around the turbine of the shot-blasting machine for incising the surface of working rollers improves its performance. The curtains are placed perpendicular to the plane of rotation of the shot-blasting turbine wheel. For the 1700 and 2500 tempering mills in casting and rolling shop 5 at OAO MMK, the dimensions of the curtains and their locations are determined so as to increase the density of the shot blast in incising the rollers and to minimize the screening effect of the shot rebounding from the curtain. Research shows that the shot velocity after collision with the curtain changes not only in direction but in magnitude. These changes depend on the friction between the shot and the curtain surface and also on the angle of attack. Modernization of the shot-blasting machine permits increase in density of the shot blast over the surface of the working rollers in the tempering mills and, correspondingly, in the peak density on the tempered sheet by a factor of 1.22.