Manufacturing method for nodular cast iron

A technology of ductile cast iron and production method, which is applied in the production field of ductile iron, can solve problems such as production costs cannot be reduced, tough materials cannot be achieved, and the process is not mature enough to achieve superior impact cycle times, good processability, and macroscopic fracture Toughness Index and Effect of Fatigue Strength Improvement
CN1472356AInactive Publication Date: 2004-02-04GUANGXI YUCHAI MACHINE PARTS MFG CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUANGXI YUCHAI MACHINE PARTS MFG CO LTD
Publication Date
2004-02-04
Estimated Expiration
Not applicable · inactive patent
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Abstract

A technology for producing nodular graphite cast iron QT800-6 features that it contains Ca (0.001-0.05 wt.%) and Ba (0.006-0.1) beside conventional components, and its heat treatment includes normalizing at 860+ / -40 deg.C for 1.5+ / -1.0 hr and tempering at 600+ / -50 deg.C for 2.0+ / -1.0 hr. Its casting features high tension strength, elongation, impact toughness and hardness, and low cost.
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Description

technical field

[0001] The invention belongs to the field of production methods of nodular cast iron. Background technique

[0002] In the national standard of ductile iron in my country, only QT800-2 and QT900-2 have a tensile strength greater than 800Mpa, and their elongation is about 2%. The ultimate fatigue bending moment of these cast irons is generally only about 750Nm. However, in the ductile iron produced by my country, some non-standard materials of QT800-3 and QT900-3 have been produced. For example, Jiangling Automobile Factory has used this material to manufacture crankshafts, and its elongation is about 3%. Abroad then has the technology of QT880-5 nodular cast iron production crankshaft, for example Italy Fiat company produces 4 cylinder small crankshafts with this nodular cast iron, and its elongation is about 5%. These materials can only still be brittle materials because their toughness and plasticity are not high enough. ...

Claims

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