Production method of non alloy precooled isothermal bardening austenic globe body

A technology of austempering and production methods, which is applied in the production field of non-alloy precooling and austempering ausferitic ductile iron, to achieve the effect of ensuring safety and expanding the scope of application
CN1514034AInactive Publication Date: 2004-07-21包文华 +1
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Patent Information

Authority / Receiving Office
CN ¡ China
Current Assignee / Owner
包文华
Publication Date
2004-07-21
Estimated Expiration
Not applicable ¡ inactive patent

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Abstract

A non-alloy spherulitic austenite iron contains C (3.5-3.8 wt.%), Si (2.6-2.85), Mn (0.2-0.4), P (<or=0.05), S (0.005-0.015) Mg (0.03-0.045), RE (0.02-0.04) and Fe (rest). Its heat treating process includes heating to 840-900 deg.C in resistance furnace, holding the temp for 1-2 hr, cooling to 780-800 deg.C, holding the temp for 0.5-1 hr, quenching in oil to 300-230 deg.C, holding the temp in isothermal furnace, and cooling in air. Its advantages are no need of noble alloy elements, and high safety.
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Description

technical field

[0001] The invention belongs to the field of production methods of metal materials, in particular to a production method of nodular cast iron. Background technique

[0002] As the latest development of ductile iron, austempered ductile iron, abbreviated as ADI in English, Austempered Ductile Iron, has become an important engineering material due to its excellent comprehensive mechanical properties. Its high strength, high toughness, impact resistance and fatigue resistance have attracted widespread attention, and have been successfully applied in industries such as machinery, metallurgy, transportation and building materials, and its application fields are still expanding. However, there are two important conditions to produce ausferitic ductile iron with qualified mechanical properties. First, due to the reason of hardenability, in order to ensure the uniformity of the workpiece structure and the stability of production, when the workpiece wall thickness is ...

Claims

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