Steel Authority of India

About: Steel Authority of India is a based out in . It is known for research contribution in the topics: Microstructure & Ultimate tensile strength. The organization has 797 authors who have published 661 publications receiving 9958 citations. The organization is also known as: SAIL.

Fluid-dynamic device

Abstract: A fluid-dynamic device comprisinga holder (41) which supports a body (42) around which a fluid is arranged to flow, where the fluid when flowing round the body exerts a force with a component which is directed across the fluid's direction of flow. The body (42) is made of a sailcloth or foil-like material, comrpising two sailcloth portions (45, 46) which are joined along two respective, mutually corresponding edges, which together form an upstream edge (43). The holder (41) has two connecting devices for securing the body (42) at ends of the upstream edge (43) and for tightening the sailcloth portions (45, 46) between them while exerting a force and a reaction force along a connecting line (49) extending between the connecting devices. According to the invention the sailcloth portions (45, 46) have upstream areas (50, 51) between the upstream edge (43) and the connecting line (49).

Studies on the effect of usage of inert-rich coal in coal blend on coke properties through pilot oven carbonization tests

Abstract: The raw Tarmi coal having ash content of 33.1 % was de-shelled to produce pre-clean of 23.2 % db ash content and then further beneficiated to produce clean coal samples of ash contents of about 13, 16 and 19 % respectively. These concentrates contained inertinites more than 70 %. Pilot oven carbonization tests were carried out by replacement of 10 % indigenous MCC and 13 % indigenous PCC under top charging conditions for clean coal samples of all three ash levels. One blend at 20 % usage level of clean Tarmi coal of 13 % ash level was carbonized under stamp charging conditions. It was observed that Tarmi coal is usable in BF coke making and it can be used gainfully under stamp charging conditions.

An as hot rolled approach to production of molybdenum and chromium microalloyed dual phase steels.

Abstract: Because of improved strength-ductility combination over HSLA steels, dual phase steels have recently become of commercial importance to both the sheet users and producers. These steels possess good properties by virtue of their microstructure which consists, typically, of about 15-20% martensite uniformly distributed in a soft matrix of ferrite. Although, the desired microstructural features of a dual phase steel can be obtained by various process routes, the most economical method is the production of this steel in as hot rolled condition. The sucessful production of dual phase steels in the hot strip mill, however, requires a careful control of process parameters particularly the finishing temperature, the cooling of the sheet on the runout table, the coiling temperature and the subsequent cooling of the coils.As a development effort some commercial heats of dual phase steel in C-Mn-Si-Cr-Mo chemistry have been produced in as hot rolled condition at Rourkela Steel Plant. The effect of coiling temperature and cooling rate on the final structure and properties of the steel has been discussed in detail. All the coils coiled at lower temperatures of about 470°C or less showed dual phase structure with uniform properties where as coiling at about 500°C or above did not yield the desired microstructure and properties. Possible reasons have been given to explain the effect of coiling temperature on microstructure. Acceleration of the cooling rate of the coil, after coiling, has been found to improve the tensile strength without significantly affecting the ductility of the material.