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Refined grains, in contrast to whole grains, refers to grain products consisting of grains or grain flours that have been significantly modified from their natural composition. The modification process generally involves the mechanical removal of bran and germ, either through grinding or selective sifting. Further refining includes mixing, bleaching, and brominating; additionally, thiamin, riboflavin, niacin, and iron are often added back in to nutritionally enrich the product. Because the added nutrients represent a fraction of the nutrients removed, refined grains are considered nutritionally inferior to whole grains. However, for some grains the removal of fiber coupled with fine grinding results in a slightly higher availability of grain energy for use by the body. Furthermore, in the special case of maize, the process of nixtamalization (a chemical form of refinement) yields a considerable improvement in the bioavailability of niacin, thereby preventing pellagra in diets consisting largely of maize products.
A cold-rolled 780-grade dh steel with fine grains and uniform structure and a production method thereof
PendingCN122128622ATemperature control deviceManufacturing convertersChemical compositionDeep drawing
This invention relates to the field of high-strength cold-rolled steel sheet preparation technology, and particularly to a cold-rolled 780 grade DH steel with refined grains and uniform microstructure, and its production method. The chemical composition of the steel, by weight percentage, is: C: 0.08%–0.12%, Si: 0.4%–0.6%, Mn: 1.6%–2.0%, Nb: 0.02%–0.04%, P≤0.012%, S≤0.005%, Ti: 0.01%–0.02%, Als: 0.025%–0.050%, N≤0.0035%, with the balance being Fe and unavoidable impurities. The ferrite grain size in the steel of this invention is 5–8 μm, with a grain size standard deviation ≤1.2 μm, solving the problem of uneven microstructure. The finished steel has a tensile strength ≥780 MPa, elongation after fracture ≥22%, and earing rate ≤1.5%, meeting the requirements of complex deep drawing.
Owner:BENGANG STEEL PLATES CO LTD