Large-specification high-carbon silicon manganese steel and manufacturing method thereof

Abstract

The invention discloses large-specification high-carbon silicon manganese steel and a manufacturing method thereof. The high-carbon silicon manganese steel comprises, by mass, 0.60-1.20% of C, 0.38-0.80% of Si, 1.00-1.90% of Mn, less than or equal to 0.020% of P, less than or equal to 0.005% of S, 0.02-0.06% of Al, 0.020-0.050% of Nb, 0.01-0.04% of Ti, 0.025-0.065% of V, 0.08-0.31% of Cr, 0.10-0.50% of Mo, and the balance Fe and inevitable impurities. According to the high-carbon silicon manganese steel and the manufacturing method, the technical problem of poor center quality of large-specification high-carbon silicon manganese steel produced in the prior art is solved, the continuous casting production of the large-specification high-carbon silicon manganese steel is realized, internal shrinkage cavities of a continuous casting billet are successfully welded, inner porosity is greatly improved, low-power center porosity, general porosity and pattern segregation of the large-specification high-carbon silicon manganese steel are less than or equal to 1.5 grade, the low-power cross section has no defects of residual shrinkage cavities and cracks, and the qualified rate of flaw detection reaches 95% or more is achieved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a large-scale high-carbon silicon-manganese steel and a manufacturing method thereof. Background technique [0002] High-carbon silicon-manganese steel mainly refers to steel types with a C content of more than 0.6% and a high Si and Mn content, such as 8MnSi, 6CrMnSi 2 Mo et al. These steel types usually have high content of C, Si, Mn and other elements, which are easy to segregate in the continuous casting process, and the solidification shrinkage of high-alloy steel is relatively large. The control of porosity and porosity is very difficult, which limits the development of large-scale high-carbon silicon-manganese steel. In general, large-scale (Ф200mm and above) high-carbon silicon-manganese steel is produced by rolling die-cast steel ingots. The shrinkage cavity and porosity of the steel ingots are better controlled, and the internal quality assurance capability is stro...

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a large-scale high-carbon silicon-manganese steel and its manufacturing method, which is used to solve the problem that the production capacity of the continuous casting slab in the prior art is limited, and the rolling ratio is small, so it cannot be welded together effectively. The defects of shrinkage cavity and porosity inside the slab lead to the technical problem of poor center quality of the produced large-scale high-carbon silicomanganese steel. The continuous casting production of large-scale high-carbon silicomanganese steel has been realized, and the shrinkage cavity inside the continuous casting slab has been successfully welded. The internal porosity has been greatly improved. The low-magnification central porosity, general porosity and ingot shape segregation of large-scale high-carbon silicon-manganese steel are all ≤1.5 grades. The low-magnification cross-section has no residual shrinkage cavity and crack defects. % technical effect above

Images