Heat treatment method for improving yield strength of steel casting
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A heat treatment method and yield strength technology are applied in the field of heat treatment to improve the yield strength of steel castings, which can solve the problems of increasing smelting costs, long test verification periods, and increasing carbon equivalents, saving heat treatment costs, improving heat treatment efficiency, and improving yield. the effect of strength
Inactive Publication Date: 2017-11-03
KOCEL STEEL
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However, what element content to increase, how much to increase, and how much to increase the yield strength need to be determined according to the specific composition standard requirements and tests. The test verification cycle is long, the interaction of elements is more complicated, and the increase in composition content will increase the smelting cost, especially It is a large-tonnage casting, and the cost increase is more obvious
At the same time, the increase of the content of most elements will increase the carbon equivalent, reduce the weldability, and increase the difficulty of welding and repairing defects in steel castings.
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[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, further description will be made below in conjunction with the embodiments.
[0012] Embodiments of the present invention provide a heat treatment method for improving the yield strength of steel castings, comprising the following steps:
[0013] a. Heat the steel casting to the austenitizing temperature of 880°C-950°C, and keep it warm. The holding time = the maximum wall thickness of the steel casting * heat preservation coefficient, where the heat preservation coefficient is 0.5min / mm~1.5min / mm , so that the interior of the casting is heated and the structure is completely transformed; compared with the existing technology, the heat preservation coefficient is reduced, which is equivalent to shortening the heat preservation time of the steel casting, thereby reducing the degree of coarsening of the grain structure of the material during normalizing high temperature...
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Abstract
A heat treatment method for improving the yield strength of steel castings, comprising the following steps: a. heating the steel castings to an austenitizing temperature of 880°C-950°C and keeping them warm; b. heating the austenitized steel castings out of the furnace, adopt air cooling + water mist cooling or tap water quenching or polymer quenching to cool the steel castings rapidly, and the cooling speed of the steel castings reaches 30°C/min-120°C/min; c. The cooled cast The steel piece is heated and tempered to 580°C-650°C, and kept warm; the chemical composition of the steel casting and the mass percentage of each component element are as follows: C%=0.12~0.35, Si%=0.20~1.0, Mn%= 0.5~1.8, P%≤0.035, S%≤0.035, Cr%≤2.20, Mo%≤1.20, Ni%≤0.50, the rest are Fe and unavoidable impurity elements.
Description
technical field [0001] The invention relates to the technical field of heat treatment of steel castings, in particular to a heat treatment method for improving the yield strength of steel castings. Background technique [0002] Intrinsic factors affecting the yield strength of steel castings include the characteristics of the material itself, such as bond, structure, structure, and atomic nature; external factors include test temperature, strain rate, stress state, sample size and precision, and sample processing methods, etc. influences. [0003] When the external factors remain stable or unchanged, for steel castings, if the yield strength is increased from the internal factors, the technical means adopted are to improve by adjusting the chemical composition or heat treatment process or the joint action of the two. The increase of most chemical elements will increase the yield strength, such as C, Si, Mn, Ti, Cu, Al, V, Nb, etc. However, what element content to increase,...
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