Efficiency of Thermocycling Treatment Application for Hardening Casing Pipes from Steel 09G2S to Strength Group Q125

In this article we justify the economic feasibility of using thermos-cyclic treatment of casing from economically alloyed steel 09G2S to produce the strength group Q125, in accordance with API 5CT. It was confirmed by the experiment that using a four-fold thermal cyclic quenching followed by a low-temperature tempering from the low-alloyed pre-eutectoid steel, it is possible to produce mechanical properties at the level: tensile strength 1068 MPa, conditional yield strength 1002 MPa, elongation 11.2 % and absorbed energy 64 Joules. In addition, an economic evaluation of the application in the production of high-strength casings from steel 09G2S, which allows reducing production costs by at least 11 %, due to thermal cycling.

Application of Reinforcing Thermocycling Treatment for Materials of Stamps Hot Deformation

The paper is devoted to the search for technological methods of increasing the resistance of the stamp tool for hot deformation. New non-standard combinations of cyclization schemes and parameters of thermocycling processing within the regime were developed. This is allowed the creation of managed structural states in the metal due to the grinding of grain, the creation of high density of defects, and the acceleration of diffusion processes to effectively manage the structure, increase the mechanical, operational properties and prevent the destruction of the working surfaces of the tool. New modes of thermocycling treatment, which have a positive effect on the mechanical characteristics of HNM5 steel, have been developed and tested. The conducted heat treatment in experimental modes, consisting of thermocycling treatment as a preliminary, quenching and tempering as the final, allows obtaining a more homogeneous structure with the preservation of fine grain and a given hardness. The grain size of the steel HNM5 structure after the use of thermocycling treatment decreases from 5–6 to 7–8 points, and after the final heat treatment – to 9–10 points. Keywords: stamp of hot deformation, thermocycling treatment, strength, relative narrowing, thermal resistance.

Effect of Thermocycling on the Thermal Degradation Kinetics of Goatskin Collagen Matrices

In the present study, the goatskin collagen matrices were tanned by chrome powder and chestnut extract. The samples were then thermocycled in a container at different temperature ranges with a dwell time of 5 h for different cycles. The thermal degradation behaviors of the collagen matrices before and after the thermocycling were investigated. The Coates-Redfern Method was applied to study the thermal degradation kinetics of different samples. The results indicate that the thermocycling exerted more dramatic effect on the native collagen matrices than on tanned samples. The tanning process endows the samples with extra crosslinking structure, and therefore, less sensitivity to thermocycling treatment. It was found that the thermal treatment at moderate temperature (0~50˚̓˹˰̵̵̵̴͈͂̈́˰̵̼̹̼̈́̈́˰̶̵̵̹̼̳̾̾ͅ˰̿̾˰̸̵̈́˰̸̵̱̼̈́͂̽˰̴̵̷̴̱̱̹͂̈́̿̾˰̱̳̹̱̹̈́͆̈́̿̾˰̵̵̷̵̹̾͂̓˰˸ΔE) of the sample. However, for the samples thermocycled at high upper limit temperature (0~150˚̓˹˼˰ΔE was decreased significantly.