High-strength and high-temperature resistance nodular cast iron, and casting technology of nodular cast iron pipe

A ductile iron, high temperature resistant technology, applied in the field of foundry processing, can solve the problem of pipe wear resistance, structural strength, structural toughness, high temperature resistance and thermal expansion resistance, affecting the reliability and service life of cast iron pipe fittings, and pipe casting operations. Low work efficiency and other problems, to achieve the effect of improving fatigue resistance and wear resistance, reducing internal stress concentration and improving structural strength

Inactive Publication Date: 2018-06-29
WUHU JINMAO FLUID TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, cast iron pipe fittings are often produced with ductile iron as the base material. Although it can effectively meet the needs of use, it is also found in use that cast iron pipe fittings processed through traditional ductile iron formula and casting technology have pipe wear resistance on the one hand. , Structural strength, structural toughness, high temperature resistance and thermal expansion resistance are relatively poor. On the other hand, it also leads to low efficiency of pipe casting operations, and defects such as trachoma, cracks and stress concentration are prone to exist inside cast iron pipes, which seriously It affects the reliability and service life of cast iron pipe fittings. Therefore, in response to this problem, it is urgent to develop a new ductile iron for cast iron pipe fittings and its matching casting process to meet the needs of actual production and use.

Method used

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  • High-strength and high-temperature resistance nodular cast iron, and casting technology of nodular cast iron pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Such as figure 1 As shown, a high-strength and high-temperature-resistant ductile iron is composed of the following raw materials in parts by weight: 10% returned iron, 10% primary iron, 0.5% iron-nickel alloy, 3% manganese-ferroalloy, 5% tungsten-molybdenum alloy, carburized 1.5% agent, 2.1% modifier, 1.2% nodulizer, 2.1% inoculant, 0.5%-2% rare earth, and the balance is steel scrap.

[0023] Further, the carburizer is coke foam with a carbon content of more than 85% by weight, and the particle diameter of coke foam is ≤400nm.

[0024] Further, the modifying agent is SiC simple substance micropowder particles, and the diameter of SiC simple substance micropowder particles is ≤400nm.

[0025] Further, the rare earth is a lanthanide element including elements such as Ce, H, Dy, Sm, Gd and Lu.

[0026] Further, the chemical element content of the high-strength and high-temperature resistant nodular cast iron is C: 3.5%, Si: 2.8%, Ni: 0.3%, W: 2.5%, Mn: 1.5%, Mo: 4%, Zr:...

Embodiment 2

[0037] Such as figure 1A high-strength and high-temperature-resistant ductile iron is shown, which is composed of the following raw materials in parts by weight: 10% returned iron, 15% primary iron, 1% iron-nickel alloy, 3.5% manganese-ferro alloy, 6.5% tungsten-molybdenum alloy, and carburizer 1%, modifier 1.1%, nodulizer 1.1%, inoculant 1.5%, rare earth 0.5%, and the balance is steel scrap.

[0038] In this embodiment, the carburant is coke foam with a carbon content of more than 85% by weight, and the particle diameter of coke foam is ≤400nm.

[0039] In this embodiment, the modifying agent is SiC simple substance micropowder particles, and the diameter of SiC simple substance micropowder particles is ≤400nm.

[0040] In this embodiment, the rare earth is a lanthanide element including elements such as Ce, H, Dy, Sm, Gd and Lu.

[0041] In this embodiment, the chemical element content of the high-strength and high-temperature resistant ductile iron is C: 3.7%, Si: 5.3%, N...

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Abstract

The invention relates to a high-strength and high-temperature resistance nodular cast iron. The high-strength and high-temperature resistance nodular cast iron comprises, by weight, 10-25% of foundryreturn, 10-25% of primary iron, 0.1-1% of iron-nickel alloy, 0.5-3.5% of manganese-iron alloy, 1-7.5% of tungsten-molybdenum alloy, 1-3.5% of a carburant, 1.1-3.6% of a modifier, 1-3% of a spheroidizer, 1-3% of an inoculant, 0.5-2% of rare earth, and the balance of scrap steel. The casting method includes the following steps: raw material melting, modifying tempering, ladle pretreatment, temperingcasting and modifying heat treatment. Rare earth elements are used to improve the distribution uniformity of the metallographic structure in nodular cast iron in order to improve the hardness of thenodular cast iron without lowering the elongation and toughness, modifying and tempering treatments are performed to comprehensively improve the fatigue resistance and the wear resistance of a spheroidal graphite cast iron workpiece, and a casting technology of the nodular cast iron can effectively reduce the internal stress concentration, cracks, small holes and other defects of the nodular castiron workpiece and improve the product quality and the structural strength of the nodular cast iron workpiece.

Description

technical field [0001] The invention relates to a casting process of high-strength and high-temperature-resistant ductile iron and ductile iron pipe fittings, belonging to the technical field of casting processing. Background technique [0002] At present, cast iron pipe fittings are often produced with ductile iron as the base material. Although it can effectively meet the needs of use, it is also found in use that cast iron pipe fittings processed through traditional ductile iron formula and casting technology have pipe wear resistance on the one hand. , Structural strength, structural toughness, high temperature resistance and thermal expansion resistance are relatively poor. On the other hand, it also leads to low efficiency in pipe casting operations, and defects such as trachoma, cracks and stress concentration are prone to exist inside cast iron pipes, which seriously It affects the reliability and service life of cast iron pipe fittings. Therefore, in response to thi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/04C22C37/10C22C33/08C21D5/00
CPCC22C37/04C21D5/00C22C33/08C22C37/10
Inventor 孙述全孙雄高峰
Owner WUHU JINMAO FLUID TECH CO LTD
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