A kind of rare earth modified 9%cr martensitic heat-resistant cast steel and its manufacturing method
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A technology of heat-resistant cast steel and a manufacturing method, which is applied in the field of martensitic heat-resistant cast steel, can solve the problems of growing carbide size, insufficient quantity, and reduced strengthening effect, so as to improve the grain shape and improve the molten steel. , the effect of improving the comprehensive mechanical properties
Active Publication Date: 2017-04-05
CHINA FIRST HEAVY IND
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The main strengthening phase M 23 C 6 The size of the type carbide grows and the quantity is not enough, the strengthening effect will be significantly reduced
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[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0028]The chemical composition and ingredients of the embodiment of the present invention, in weight percent (%), include: C: 0.12; Si: 0.20; Mn: 0.8; Cr: 9.2; Mo: 1.5; Co: 1.0; Ni: 0.17; V: 0.20; Nb: 0.05; N: 0.025; B: 0.010; La: 0.01; Ce: 0.02; Y: 0.0017; Cu≤0.15; As≤0.020; Sb≤0.0015; 1.5ppm; O≤35ppm; melting in a vacuum induction furnace to ensure uniform melting before casting.
[0029] The following process is used for the heat treatment of the steel of the embodiment: heating the casting to 1070°C, holding it for 10h, air cooling to room temperature for homogenization; heating to 1100°C, holding it for 2h, air cooling to room temperature for normalizing; Aging at room temperature, as attached figure 1 Shown is the M precipitated out of the material after this treatment 3 C precipitated phase; then heated to 750 ° C for 5 hours for temp...
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Abstract
The invention discloses a novel rare-earth modified 9% Cr martensitic heat resisting cast steel and a manufacturing method thereof. The martensitic heat resisting cast steel is prepared from such components as C, Si, Mn, Cr, Mo, Ni, Co, V, N, Nb, B, rare earth, P, S, Cu, As, Sb, Sn, Al, H, O, and the balance of Fe and inevitable impurities; and the rare earth is mixed rare earth of two or more Ce, La, Y, Pr and Nd. The heat resisting steel can be melted in various conventional smelting ways and cast into desired cast steel pieces; a heat treatment method for obtaining high endurance property comprises the following steps: firstly, heating the cast steel pieces above the temperature Ac3 thereof for homogenization for a long time at a higher temperature; secondly, reheating above the temperature Ac3 for sufficient austenitizing, and then discharging, cooling in air and normalizing, and then heating the heat resisting steel until a relatively low temperature for heat-preservation aging, and finally, performing once or more tempering below the temperature Ac1.
Description
technical field [0001] The invention relates to a martensitic heat-resistant cast steel, in particular to a rare earth modified 9% Cr martensitic heat-resistant cast steel and a manufacturing method thereof. Background technique [0002] In order to improve the thermal efficiency of thermal power plants, reduce fuel consumption and reduce carbon dioxide emissions, countries all over the world are scrambling to develop supercritical and ultra-supercritical thermal power units. However, with the improvement of unit thermal efficiency, the working parameters of supercritical and ultra-supercritical thermal power units have also increased significantly, which puts forward higher requirements for the strength, corrosion resistance and creep performance of heat-resistant steel used at high temperatures. New martensitic heat-resistant steel materials with higher heat resistance, high strength and high toughness must be used to replace 1Cr12Mo, 1Cr12MoV, 1Cr9MoVNbN and other materia...
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