Smelting method of chromium-molybdenum-copper-nickel-tin-antimony low-alloy wear-resistant cast iron

A wear-resistant cast iron and low-alloy technology, applied in the field of cast iron smelting, can solve problems such as difficulty in ensuring complete melting of alloys, unqualified metallographic structure of cast iron, and substandard mechanical properties, so as to ensure thorough melting, reduce melting time, and improve smelting efficiency effect
CN104178684AInactive Publication Date: 2014-12-03HEBEI FENGWEI MACHINERY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HEBEI FENGWEI MACHINERY
Publication Date
2014-12-03
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a smelting method of a chromium-molybdenum-copper-nickel-tin-antimony low-alloy wear-resistant cast iron, which comprises the following steps: raw material weighing: preparing and weighing raw materials and alloys according to the prescribed material specifications and weight proportion; smelting: sequentially adding the materials according to the technical charging sequence, and melting, wherein refractory molybdenum iron, chromium iron and pure nickel are added in the middle of the pig iron batch charging process, and scrap steel is added; component adjustment: adding silicon iron and manganese iron to adjust to acceptable components, heating, and adding a copper block which can be easily damaged by fire; and late inoculation in casting ladle: before tapping and after preheating the casting ladle, adding a tin block (accounting for 0.05% of the raw materials) and an antimony block (accounting for 0.01% of the raw materials) to the bottom of the ladle, and adding late inoculation silicon granules into the molten iron in the ladle in the casting process. The method solves the problem that the high-melting alloy added after all the iron liquid is completely molten is refractory, is capable of shortening the melting time and enhancing the smelting efficiency, promotes the formation of the fine lamellar pearlite, and ensures the element components, mechanical properties and metallurgical structure of the casting to simultaneously satisfy the requirements.
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Description

technical field

[0001] The invention belongs to the technical field of cast iron smelting, and in particular relates to a melting method of low-alloy wear-resistant cast irons such as chromium, molybdenum, copper, nickel, tin, antimony, etc., so as to ensure that the elemental components, mechanical properties and metallographic structure of castings all meet the requirements. Background technique

[0002] By adding a certain proportion of alloys to gray cast iron, improving the matrix structure, refining pearlite and improving the shape of graphite lines, the mechanical properties of cast iron are effectively improved, especially the high-speed wear resistance.

[0003] The content of carbon in the low-alloy wear-resistant cast iron of the present invention is 3.0-3.2%, the content of silicon is 1.5-1.8%, the content of manganese is 0.65-0.85%, the content of chromium is 0.15-0.2%, and the content of molybdenum is 0.8-1.0%. , the content of nickel is 0.3-0.4%, the content o...

Claims

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