Preparation method of high-strength and high-tenacity nodular cast iron

A ductile iron and high toughness technology, applied in the field of cast iron metallurgy, can solve the problems of insufficient tensile strength and yield strength of ductile iron, higher strength of unsuitable materials, etc. good effect

Active Publication Date: 2018-10-09
佛山市高明康得球铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the tensile strength and yield strength of the ductile iron prepared by the above-mentioned invention patents are not high enough, so it is not suitable for materials with higher strength requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A preparation method of high-strength and high-toughness ductile iron, the ductile iron is composed of the following elemental components in mass percentage: C: 3.7%, Si: 3.6%, Mn: 0.5%, Sn: 0.02%, Ni: 0.5%, Ti: 0.35%, Sb: 0.007%, RE: 0.03%, P: 0.18%, S≤0.02%, the balance is Fe and unavoidable impurities.

[0036] Its preparation method comprises the following steps:

[0037] S1. (1) Ingredients: The raw materials and proportions are as follows: steel scrap 51%, pig iron 21%, scrap machine iron 11%, recycled material 12%, ferrosilicon 1.6%, ferromanganese 0.9%, ferrotitanium 0.9%, nickel ingot 0.6%, ferrophosphorus 0.5%, recarburizer 0.5%; (2) Smelting: add steel scrap, pig iron, scrap machine iron, and returned materials to the intermediate frequency furnace for heating, and divide the recarburizer into three times before the temperature rises to 750°C Add it into the intermediate frequency furnace; after the temperature in the intermediate frequency furnace is higher...

Embodiment 2

[0042] A preparation method of high-strength and high-toughness ductile iron, the ductile iron is composed of the following elemental components in mass percentage: C: 3.6%, Si: 3.5%, Mn: 0.6%, Sn: 0.01%, Ni: 0.6%, Ti: 0.3%, Sb: 0.004%, RE: 0.02%, P: 0.16%, S≤0.02%, the balance is Fe and unavoidable impurities.

[0043] Its preparation method comprises the following steps:

[0044] S1. (1) Ingredients: The raw materials and proportions are as follows: scrap steel 50%, pig iron 25%, scrap machine iron 10%, recycled material 10%, ferrosilicon 1.2%, ferromanganese 0.8%, ferrotitanium 1%, nickel ingot 0.8%, ferrophosphorus 0.8%, recarburizer 0.4%; (2) Smelting: Add steel scrap, pig iron, scrap machine iron, and recycled materials to the intermediate frequency furnace for heating, and divide the recarburizer three times before the temperature rises to 750°C Add it into the intermediate frequency furnace; after the temperature in the intermediate frequency furnace is higher than 14...

Embodiment 3

[0049] A preparation method of high-strength and high-toughness ductile iron, the ductile iron is composed of the following elemental components in mass percentage: C: 3.8%, Si: 3.8%, Mn: 0.4%, Sn: 0.01%, Ni: 0.6%, Ti: 0.4%, Sb: 0.004%, RE: 0.04%, P: 0.2%, S≤0.02%, the balance is Fe and unavoidable impurities.

[0050] Its preparation method comprises the following steps:

[0051] S1. (1) Ingredients: The raw materials and proportions are as follows: scrap steel 55%, pig iron 20%, scrap machine iron 10%, recycled material 10%, ferrosilicon 1.1%, ferromanganese 1%, ferrotitanium 1%, nickel ingot 0.8%, ferrophosphorus 0.5%, recarburizer 0.6%; (2) Smelting: Add steel scrap, pig iron, scrap machine iron, and recycled materials to the intermediate frequency furnace for heating, and divide the recarburizer three times before the temperature rises to 750°C Add it into the intermediate frequency furnace; after the temperature in the intermediate frequency furnace is higher than 1400°...

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Abstract

The invention discloses a preparation method of high-strength and high-tenacity nodular cast iron. The high-strength and high-tenacity nodular cast iron is prepared from, by mass, 3.6%-3.8% of C, 3.5%-3.8% of Si, 0.4%-0.6% of Mn, 0.01%-0.04% of Sn, 0.4%-0.6% of Ni, 0.3%-0.4% of Ti, 0.04%-0.01% of Sb, 0.02%-0.04% of RE, 0.16%-0.2% of P, no more than 0.02% of S, and the balance Fe and inevitable impurities. The tensile strength of the nodular cast iron is 1050-1180 MPa, the yield strength of the nodular cast iron is 780-820 MPa, the ductility of the nodular cast iron is 15%-16%, the nodularity of the nodular cast iron is 95%, and all properties of the nodular cast iron are excellent.

Description

technical field [0001] The invention relates to the technical field of cast iron metallurgy, in particular to a preparation method of high-strength and high-toughness ductile iron. Background technique [0002] Ductile cast iron is a cast iron material with spherical graphite obtained through inoculation and spheroidization. It has excellent mechanical properties, processing properties, wear resistance, shock absorption properties and low production costs. Its comprehensive properties are similar to steel. Because of its excellent performance, it is successfully used to cast parts with complex stress, high strength, toughness and wear resistance, such as auto parts, cast iron pipe fittings, wind power parts, machine tool parts, engine crankshafts, etc. [0003] Chinese patent CN104120332A discloses a high-strength and high-toughness ductile iron 600-10, the mass percentage of each element of the high-strength and high-toughness ductile iron 600-10 is: C: 3.48%-3.7%, Si: 2.5%...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/04C22C37/10C22C33/10C21C1/10C21D1/26C21D5/00
CPCC21C1/105C21D1/26C21D5/00C22C33/10C22C37/04C22C37/10Y02P10/20
Inventor 叶展亮
Owner 佛山市高明康得球铁有限公司
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