A method for manufacturing a steel plate provided with a layered structure. A method for manufacturing a steel plate includes: i) providing a high carbon steel plate; ii) homogenizing the high carbon steel plate; iii) transforming the high carbon steel plate into an austenitic phase by heating the high carbon steel plate; iv) contacting the high carbon steel plate with an oxidization gas and converting the high carbon steel plate into a steel plate comprising surface layers that are spaced apart from each other and are decarburized to be transformed into a ferritic phase, and a center layer that is located between the surface layers and is not decarburized; and v) cooling the high carbon steel plate and transforming the center layer into a martensitic phase.

Method for manufacturing steel plate with a layered structure

The invention discloses a high-iron steel back material with high strength and toughness and a preparation method of the high-iron steel back material. The preparation method comprises the steps of ingredient preparation, smelting, raw molten iron sampling, balling, casting, incubation and insulation, annealing treatment, normalizing and tempering, metallography detection and mechanics performance testing. The high-iron steel back material is prepared from 3.5-3.9% of C, 2.5-3.0% of Si, 0.15-0.28% of Mn, 0.35-0.5% of Ni, 0.58-0.72% of Cu, 0.035-0.04% of Cr, 0.035-0.045% of Mg, 0.04-0.07% of rare earth alloy, 0.035% or less of P, 0.025% or less of S, and the balance Fe. The material has the comprehensive performance of the high elongation of ferrite nodular cast iron and the high strength of pearlite nodular cast iron.

High-iron steel back material and preparation method thereof

A method for forming an austempered iron composition with a nanoscale microstructure includes a step of heating an iron-carbon-silicon alloy with silicon to a first temperature that is lower than A1 for the iron-carbon-silicon alloy. The iron-carbon-silicon alloy is then adiabatically deformed such that the temperature of the iron-carbon-silicon alloy rises to a second temperature which is sufficient to form proeutectoid ferrite and austenite. The iron-carbon-silicon alloy is cooled to a first austempering temperature. The iron-carbon-silicon alloy is then heated to a second austempering temperature that is greater than the first austempering temperature to form a dual phase microstructure. Characteristically, the dual phase microstructure includes proeutectoid ferrite and ausferrite.

Development of nanostructure austempered ductile iron with dual phase microstructure

PURPOSE: An austempered ductile cast iron is provided which has superior mechanical properties and forming property by carrying out an ordinary austempering after performing a special heat treatment such as pre-quenching or pre-heating giving prior structure before austempering a material having the bad forming property. CONSTITUTION: The austempered ductile cast iron comprises 2.6 to 4.0 wt.% of C, 2.0 to 3.5 wt.% of Si, 0.5 wt.% or less of Mn, 0.1 wt.% or less of P, 0.3 wt.% or less of S, 0.2 to 0.5 wt.% of Mo, 0.5 to 1.5 wt.% of Ni, 0.1 to 0.4 wt.% of Cu, 0.03 to 0.05 wt.% of Mg and a balance of Fe. The method for manufacturing an austempered ductile cast iron comprises the processes of casting a spheroidal graphite cast iron from an alloy comprising 2.6 to 4.0 wt.% of C, 2.0 to 3.5 wt.% of Si, 0.5 wt.% or less of Mn, 0.1 wt.% or less of P, 0.3 wt.% or less of S, 0.2 to 0.5 wt.% of Mo, 0.5 to 1.5 wt.% of Ni, 0.1 to 0.4 wt.% of Cu, 0.03 to 0.05 wt.% of Mg and a balance of Fe; heat treatment of quenching the austenitic spheroidal graphite cast iron in oil after austenizing the casted spheroidal graphite cast iron at a temperature of 900 deg.C for 1 hour; and austempering in which the heat treated cast iron is treated at the constant temperature of 350 deg.C for 2 hours after treating at the constant temperature of 900 deg.C for 2 hours.

Austempered ductile cast iron

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Austempered ductile cast iron