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Low-temperature-resistance high-toughness as-cast ductile iron, and production method and application thereof

A production method and high-toughness technology, applied in low-temperature-resistant high-toughness cast ductile iron, production and application fields, can solve problems such as poor desulfurization effect, poor nodularization, large dosage of nodulizers and desulfurizers, and achieve The effect of prolonging the effective time of incubation, facilitating absorption, and delaying the onset time

Active Publication Date: 2011-05-25
四川海工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] An object of the present invention is to provide a low-temperature-resistant high-toughness as-cast ductile iron to solve the existing problems of low-temperature high-toughness ductile iron such as poor spheroidization, poor desulfurization effect, large dosage of nodulizers and desulfurizers, and improvement. Many of the above-mentioned defects such as heat treatment of toughness

Method used

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  • Low-temperature-resistance high-toughness as-cast ductile iron, and production method and application thereof
  • Low-temperature-resistance high-toughness as-cast ductile iron, and production method and application thereof
  • Low-temperature-resistance high-toughness as-cast ductile iron, and production method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A low-temperature-resistant high-toughness cast ductile iron, the chemical composition of which is: C=3.6%, Si=2.06%, Mn=0.18%, P=0.02%, S=0.01%, Mg 残留 =0.048%, ∑Re 残留 =0.021%, Sr=0.08%, Ni=0.23%, Ti=0.13%, and the balance is Fe.

[0045] The production method of the low-temperature-resistant high-toughness cast ductile iron comprises the following steps:

[0046] (1) Prepare the ladle and repair the bottom hole

[0047] Select a molten iron ladle with a capacity of 0.5 tons, and repair the refractory layer according to the conventional process regulations (clay refractory bricks are used to lay the wall of the molten iron ladle, and a layer of refractory dressing is applied on it, and the refractory dressing is 10-15% refractory clay, 20-25% red Coal powder, the balance is 40 / 70 mesh quartz sand, add appropriate amount of water and mix to form agglomerates), in the middle of the bottom, use clay refractory bricks and refractory dressings to repair and enamell Φ300×35...

Embodiment 2

[0064] A low-temperature-resistant high-toughness cast ductile iron, the chemical composition of which is: C=3.6%, Si=2.08%, Mn=0.16%, P=0.019%, S=0.008%, Mg 残留 0.048%, ∑Re 残留 =0.016%, Sr 0.10%, Ni 0.25%, Ti 0.15%, and the balance is Fe.

[0065] The production method of the low-temperature-resistant high-toughness cast ductile iron comprises the following steps:

[0066] (1) Prepare the ladle and repair the bottom hole

[0067] Select a ladle with a capacity of 1 ton, and repair the refractory layer according to the conventional process (clay refractory bricks are used to lay the wall of the molten iron, and a layer of refractory dressing is applied on it. The refractory dressing is 10-15% refractory clay, 20-25% red Coal powder, the balance is 40 / 70 mesh quartz sand, add appropriate amount of water and mix to form agglomerates), in the middle of the bottom, use clay refractory bricks and refractory dressings to repair and enamell Φ350×450 cylindrical bottom nest for layere...

Embodiment 3

[0084] A low-temperature-resistant high-toughness cast ductile iron, the chemical composition of which is: C=3.4%, Si=2.3%, Mn=0.18%, P=0.019%, S=0.009%, Mg 0.036%, ΣRe=0.016%, Sr 0.10%, Ni 0.25%, Ti 0.15%, and the balance is Fe.

[0085] The production method of the low-temperature-resistant high-toughness cast ductile iron comprises the following steps:

[0086] (1) Prepare the ladle and repair the bottom hole

[0087] Select a ladle with a capacity of 1 ton, and repair the refractory layer according to the conventional process (clay refractory bricks are used to lay the wall of the molten iron, and a layer of refractory dressing is applied on it. The refractory dressing is 10-15% refractory clay, 20-25% red Coal powder, the balance is 40 / 70 mesh quartz sand, add appropriate amount of water and mix to form agglomerates), in the middle of the bottom, use clay refractory bricks and refractory dressings to repair and enamell Φ350×450 cylindrical bottom nest for layered preload...

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Abstract

The invention discloses low-temperature-resistance high-toughness as-cast ductile iron, which comprises the following chemical ingredients in percentage by weight: 3.4 to 3.6 percent of C, 2.0 to 2.3 percent of Si, at most 0.2 percent of Mn, at most 0.02 percent of P, at most 0.01 percent of S, 0.035 to 0.05 percent of Mg residue, 0.015 to 0.025 percent of sigma Re residue, 0.05 to 0.1 percent of Sr, 0.15 to 0.25 percent of Ni, 0.10 to 0.15 percent of Ti and the balance Fe. The invention also discloses a production method and application of the low-temperature-resistance high-toughness as-cast ductile iron to the preparation of wind-power generator accessories, automobile accessories, boat accessories and petrochemical engineering. The low-temperature-resistance high-toughness as-cast ductile iron produced by the method provided by the invention can reach each technical index of QT400-18L of GB / T1348-2009 in the cast state, the graphitizing annealing heat treatment is avoided, the energy consumption is reduced, and meanwhile, the low-temperature-resistance high-toughness as-cast ductile iron has the outstanding advantages of stable quality and the like, and the operation is simple and convenient.

Description

technical field [0001] The invention relates to a cast ductile iron, a production method and its application, in particular to a cast ductile iron with low temperature resistance and high toughness, a production method and its application. Background technique [0002] Ductile iron is a high-strength cast iron material with excellent mechanical properties, such as high tensile strength and yield strength, high elongation and certain impact toughness. Under normal temperature working conditions, nodular cast iron can replace cast steel to cast complex parts, the production cost is low, and it has a wide range of uses. No. 1 in the world, there are data showing that in 2006, the output of ductile iron in my country has reached more than 6 million tons). However, when ordinary ductile iron is used at low temperature, its toughness drops sharply, turning ductile iron into a brittle material, unable to resist the impact of various service environments, which may cause sudden brit...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C33/08
Inventor 蒲正海何琦蒋明罗杨友全张勇权
Owner 四川海工科技有限公司
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