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High strength and high toughness as-cast-condition QT800-5 nodular cast iron and production method thereof

A ductile iron, high-toughness technology, applied in the field of metal casting and metal materials, can solve the problem of not being able to meet industrialized mass production, etc., and achieve the effects of long production cycle, wide application range and strong thermal insulation ability.

Active Publication Date: 2018-05-08
WUHAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country's research on high-strength and high-toughness as-cast nodular cast iron has just started, and there is no standard process that can meet industrial mass production.

Method used

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  • High strength and high toughness as-cast-condition QT800-5 nodular cast iron and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Ordinary clay green sand is filled into the sand box and molded on a micro-seismic compaction molding machine. The average hardness of the sand mold is controlled at about 82. The raw material is Q12 pig iron, and its composition is (mass fraction, the same below): C 3.60%~3.90%, Si 2.30%~2.8%, Mn<0.30%, P<0.04%, S≤0.02%, Cu 0.50%~1.20 %, Mo<0.30%, Sb<0.02%, and the balance is iron. The induction furnace is used for smelting, and the ingredients are analyzed and adjusted during the process to make the ingredients qualified. Finally, the temperature is raised to 1520°C and left for 5-8 minutes to remove the slag and come out of the furnace. Add 1.3% FeSiMg8Re5 spheroidizer, 0.65% 75 ferrosilicon, 0.42% 60 molybdenum and 0.8% pure copper rods in the nodulizing bag in turn, and cover each layer with perlite after compacting, and then put the iron in the furnace The liquid is washed into the spheroidizing bag, and after slag making and slag removal, the bag-inoculation tre...

Embodiment 2

[0027] The other steps and parameters of this embodiment are exactly the same as in Example 1, except that the Sb in the subcontracting inoculant is replaced by Sn, and Sn<0.03%; the amount of nodulizer added is changed: 1.4% FeSiMg8Re5 nodulizer, 0.76% 75 ferrosilicon, 0.42% 60 molybdenum iron and 0.7% pure copper rod.

[0028] The technical indicators of the cast Y-type test block produced in this example are: spheroidization grade 2, graphite size 6-7, pearlite content 65-70%; mechanical properties: tensile strength Rm814-816MPa, elongation A5 .6 ~ 6.8%.

Embodiment 3

[0030] The other steps and parameters of this embodiment are exactly the same as those in Example 1, except that: the Sb in the subcontracting inoculant is replaced by Sn, and Sn<0.03%; the addition of nodulizing agent is changed: 1.5% FeSiMg8Re5 spheroidizer, 0.95% 75 ferrosilicon, 0.42% 60 molybdenum iron, 1% pure copper rod and 1% Ni.

[0031] The technical indicators of the cast Y-type test block produced in this embodiment are: spheroidization grade 2, graphite size 6-7 (see attached figure 1 Right), the pearlite content is 65-70% (see attached figure 1 Left); mechanical properties: tensile strength Rm 809~829MPa, elongation A5.4~7.0%.

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Abstract

The invention relates to high strength and high toughness as-cast-condition QT800-5 nodular cast iron and a method for forming the nodular cast iron through common clay sand. According to the method,pig iron for nodular cast iron, carbon waste steel and foundry returns serve as raw materials, a proper amount of copper, molybdenum, nickel, antimony or tin or other alloys are added in, an inductionelectric furnace is adopted for smelting iron melt, a rare earth ferrosiliconmagnesium alloy serves as a nodulizing agent, ferrosilicon, bariumsili and silicon bismuth are used for performing inoculation treatment, on a micro vibration compaction modeling machine, common clay sand is used for modeling, and the high strength and high toughness as-cast-condition QT800-5 nodular cast iron can be obtained through box removing after casting is performed for 30-60 min. The high strength and high toughness as-cast-condition QT800-5 nodular cast iron can meet the requirement of the market for high strength and high toughness as-cast-condition QT800-5 nodular cast iron pieces, and especially meets the requirement of the automobile industry for lightweight castings.

Description

technical field [0001] The invention relates to the technical field of metal casting and metal materials, in particular to a high-strength and high-toughness as-cast QT800-5 nodular cast iron and a method for molding the nodular cast iron by using ordinary clay sand. Background technique [0002] Since its appearance in 1947, ductile iron castings have developed rapidly because of their good mechanical properties and casting properties. They have become important engineering materials and have been widely used in industrial production. At present, the national standard GB / T1348-2009 "Ductile Iron Castings" stipulates a total of 14 grades of ductile iron castings. The products of these grades generally have the characteristics of low strength and high elongation or high strength and low elongation. Although they have been widely used in various field and has made great contributions to the development of the national economy, but with the rapid development of my country's econ...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C37/04C22C33/10C21C1/10
CPCC21C1/10C22C33/10C22C37/04C22C37/10Y02P10/20
Inventor 刘生发郭元洲梁兵王建明王友福汪国昌丁以刚何强郭兴才王德根
Owner WUHAN UNIV OF TECH
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