Controlled cooling technology is extremely vital within the production of rolling a technology that by dominant the temperature and cooling rate when rolling the steel to enhance the organization and performance of steel and, ultimately, sensible mechanical properties. With the event of management cooling technology, that has been applied to additional mature sheet, strip, wire and alternative fields.
For high-quality steel pipe, the take a look at method victimisation air cooling when rolling to provide a additional uniform equiaxed solid solution and lamellar mixture structure; once victimisation mist cooling when rolling method, though in ulterior air cooling the steel temperature slightly rise, thanks to the steel surface by alternating the role of aerosol cooling and ulterior air cooling, the surface temperature is reduced when the primary rise, whereas the center and inner temperature changes comparatively slowly diffuse. Such diversification of pipe wall thickness direction of the organization is certain to seem. within the steel surface generated bainite zero.9mm thickness and zero.9mm to 35mm thickness of the transition zone composite tissue. as a result of sometimes acerate solid solution dislocation density more than equiaxed solid solution dislocation density, therefore, from the purpose of read of dislocation strengthening, acerate solid solution corresponding yield strength larger than equiaxed solid solution corresponding yield strength . additionally, when the rolling mist cooling tube structure purpose of read, it equiaxed solid solution grain size is considerably smaller than the equiaxed solid solution grains by air cooling obtained from fine-grain strengthening perspective, considerably improved mechanical properties

Seamless sq. tube so as to manage the cooling when rolling to raised promote and apply to seamless production of low C low Mn seamless steel rolling surface for fast cooling to get high-strength, high toughness of acerate solid solution tissue and sorbite, grain refinement considerably, the mechanical properties of steel greatly improved; for carbon steel and steel pipe, when rolling the utilization of acceptable fast cooling method, is quickly cooled and steel in beneath their twin role tempering heat, get the surface with high strength, high toughness sorbite, acerate solid solution, lower bainite and alternative organizations, at an equivalent time, the degree of internal solid solution mesh reduced grain refinement, mechanical properties like strength and toughness of steel as an entire at an equivalent time improve and impact toughness within the case of elongation isn't reduced considerably improve, improve the state-rolled low impact toughness. permit fast cooling when rolling method rectangular steel composite thickness direction of the organization, facilitate improve overall performance overall seamless sq. tube. so as to review the results of the initial applied to production follow, together developed a controlled cooling when rolling hot rolled seamless system to enhance the performance improvement of the merchandise.

Rolled steel when the most heat by radiation, conductivity and convection in 3 ways. Seamless sq. tube that convective heat transfer between the steel surface and also the cooling medium is that the main sort of heat. employing a mixture of water and air as a cooling medium, referred to as "mist cooling." once cool, the cooling rate than the steel surface of the steel pipe itself is way slower thermal physical phenomenon, comparatively uniform thickness direction of the steel pipe temperature; once mist cooling, cooling pipe surface speed greatly improved, there's a particular gradient within the locality of the surface of the steel pipe within the thickness direction. Hot rolled seamless pipe by the end rolling temperature was lowered  to temperature in regarding 950  method, looking on the cooling conditions, the solid solution rotten into totally different tissue varieties of product. Therefore, once the temperature distinction between mist cooling pipe close to the surface within the thickness direction, can inevitably result in diversification pipe thickness direction of the organization; due to the inner pipe admit heat conductivity heat transfer, it's continuous throughout the natural action, and so, albeit the formation of various organizations, additionally the presence of a transition zone between the organization, namely: between the various microstructures of a compounding zone exist, like steel from differing kinds of tissue layers of composite. structure diversity in order that the mechanical properties of the steel pipe is modified, the new exhibit mechanical properties like strength and toughness combination; structure continuity between the pipe in order that the various varieties of tissue in shut reference to the "transition zone", doesn't occur "layered" phenomenon; complicated organization makes steel {in totally different|in several|in numerous} thicknesses at different mechanical properties exhibitFind Article, demonstrate the options and benefits of the material.