Manufacturing method of low-temperature ferrite nodular cast iron material

A technology of ductile cast iron and its manufacturing method, which is applied in the manufacturing field of new low-temperature, high-strength, high-toughness and impact-resistant ferritic ductile iron materials

Active Publication Date: 2013-07-10
LAIZHOU XINZHONGYAO MACHINERY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

China can only rely on imports, but the comprehensive performance of imported products does not meet the product performance requirements

Method used

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  • Manufacturing method of low-temperature ferrite nodular cast iron material
  • Manufacturing method of low-temperature ferrite nodular cast iron material
  • Manufacturing method of low-temperature ferrite nodular cast iron material

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Embodiment Construction

[0055] The present invention will be further described below in combination with specific embodiments.

[0056] The methods used in the following examples are conventional methods unless otherwise specified, and the percentages are mass percentages unless otherwise specified.

[0057] (1), Raw material feeding mass ratio: scrap steel 10%, returned furnace iron 10%, high-purity pig iron (C≥3.5%; Si≤0.5%; Mn≤0.2%; P≤0.03%; S≤0.02%; Ti≤0.03 %; other trace elements: the total content of chromium, molybdenum, vanadium, tin, antimony, lead, bismuth, aluminum, boron, tellurium, arsenic, etc. ≤ 0.05%.) 80%; and scrap steel, returned iron, high-purity pig iron total Amount of 0.8% nickel.

[0058] (2) Smelting: The furnace temperature is 1540-1550°C;

[0059] (3) The process of feeding spheroidization and inoculation treatment is adopted; the process of monofilament feeding spheroidization and furnace inoculation treatment is adopted; the process of subcontracting spheroidization is ...

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Abstract

The invention discloses a manufacturing method of a low-temperature ferrite nodular cast iron material. The material consists of the following chemical components: 3.5-3.9% of C, 1.9-2.3% of Si, not greater than 0.2% of Mn, not greater than 0.03% of P, not greater than 0.02% of S, 0.04-0.06% of Mg, and 0.25-0.95% of Ni. The performances of the material are as follows: at minus 40 DEG C, minus 50 DEG C and 60 DEG C, impact energies are not less than 12K, room-temperature tensile strength is not lower than 400MPa, ductility is not lower than 18%, and other major mechanical performance indexes are qualified. The nodular cast iron material can be widely applicable to cold zone as well as manufacturing of mechanical equipment products with requirements on low-temperature impact resistance and high ductility.

Description

[0001] technical field [0002] The invention relates to a manufacturing method of a novel low-temperature, high-strength, high-toughness, impact-resistant ferritic nodular cast iron material. Background technique [0003] With the development of the times, science and technology have become more and more advanced, and new and higher requirements have been gradually put forward for some basic industries and materials. For example, the rail transit industry and the wind power industry have put forward higher requirements for the performance of ductile iron at low temperatures. requirements. At present, the domestic and foreign standards for ductile iron at low temperatures only stipulate that the low-temperature impact absorption energy at -20°C and -40°C is ≥12J, and the tensile strength to achieve low-temperature impact performance at -40°C is only ≥350MPa, and is affected by the operating environment. Impact, some rail transit products not only require the impact absorptio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/04C22C33/10
Inventor 杨忠耀
Owner LAIZHOU XINZHONGYAO MACHINERY
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