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A trace alloying process of nodular cast iron

A ductile iron and alloying technology, applied in the field of trace alloying technology, can solve the problems of the coexistence of advantages and disadvantages of the comprehensive mechanical properties of ductile iron, and achieve the effects of improving the inoculation effect, improving the strength and wear resistance, and improving the strength.

Active Publication Date: 2018-01-09
湖南金龙智造科技股份有限公司
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  • Abstract
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Problems solved by technology

However, the effect of alloying elements and the influence of the addition amount on the comprehensive mechanical properties of ductile iron are both advantages and disadvantages.

Method used

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  • A trace alloying process of nodular cast iron
  • A trace alloying process of nodular cast iron
  • A trace alloying process of nodular cast iron

Examples

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Embodiment 1

[0041] See attached Figure 5 , a trace alloying process of high-strength, high-plastic ductile iron, comprising the following steps:

[0042] 1) Smelting: The molten iron is smelted in an intermediate frequency induction furnace. Add 55-65% pig iron by weight, 25-35% nodular iron return charge, and 5-10% scrap steel into the electric furnace. The temperature of the electric furnace is raised to 1450-1550°C smelting the mixture of pig iron, nodular iron return charge and steel scrap into molten iron;

[0043] 2) Adjusting the composition content of molten iron: through pre-stove analysis, the weight percentage of the chemical components in the molten iron obtained in step 1) is adjusted to the following ranges: C: 3.35%-3.7%, Si: 2.3%-2.7%, Mn: 0.35%- 0.55%, P≤0.035%, S≤0.015%, Re: 0.016%-0.018%, Mg: 0.02%-0.04%, Nb: 0.55%-0.85%;

[0044]3) Trace alloying by spheroidization and wire feeding method: add the molten iron obtained in step 2) to the spheroidizer bag, carry out sp...

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Abstract

The invention relates to a trace alloying process of ductile iron. The trace alloying process of the ductile iron comprises the following steps of a step of spheroidizing, primary inoculation treatment and feed wire method trace alloying and a step of secondary inoculation treatment and poured-over method trace alloying. With adoption of the trace alloying process of the ductile iron, the strength and the plasticity of the produced ductile iron are obviously improved, the tensile strength is larger than 750MPa, the yield strength is about 560MPa, and the percentage elongation after fracture is above 7.5 percent.

Description

technical field [0001] The invention relates to a trace alloying process for improving the strength and plasticity of nodular cast iron. Background technique [0002] Ductile iron is widely used in machinery manufacturing, mining metallurgy, petrochemical and national defense industries. With the rapid development of modern industrial technology, the requirements for the comprehensive mechanical properties of ductile iron are getting higher and higher. For example, the mechanical properties of crossheads for oil drilling are required to be tensile strength ≥ 689MPa, yield strength ≥ 483MPa, and elongation ≥ 3.0; the required tensile strength for lathe spindles, ball mill gear shafts, small water turbine spindles, etc. is above 700MPa , the yield strength reaches above 420MPa, and the elongation reaches above 2%. Automotive gear series (timing gears, planetary gears, rear axle gears, etc.) require higher strength and toughness. Those skilled in the art are well aware that t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/10C21C1/10C22C37/10C22C37/04
CPCC21C1/10C22C33/10C22C37/04C22C37/10
Inventor 常应祥许晓嫦黄为王威明
Owner 湖南金龙智造科技股份有限公司
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