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As-cast high-strength ductile iron and preparation method thereof

A nodular cast iron, high-strength technology, applied in the field of nodular cast iron, can solve the problem that the strength of nodular cast iron is difficult to meet the actual needs

Active Publication Date: 2016-07-20
YINFENG CASTING WUHU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the most widely used ductile iron in this field is the ductile iron of grade 700-2 conforming to the international standard ENGJS / UNE-EN1563, but the strength of this ductile iron is often difficult to meet the actual needs.

Method used

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  • As-cast high-strength ductile iron and preparation method thereof
  • As-cast high-strength ductile iron and preparation method thereof
  • As-cast high-strength ductile iron and preparation method thereof

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preparation example Construction

[0021] The present invention also provides a method for preparing the as-cast high-strength nodular cast iron as described above, comprising:

[0022] 1) Preheat the steel scrap and returned materials at 1050-1150°C;

[0023] 2) Melting the preheated raw materials at 1500-1550°C to make molten iron;

[0024] 3) adding rare earth nodulizer and inoculant into molten iron and stirring to obtain inoculated molten iron;

[0025] 4) adding the flow inoculant into the inoculated molten iron and casting to obtain as-cast high-strength nodular cast iron;

[0026] Among them, the rare earth spheroidizer contains rare earth elements, magnesium, calcium, barium, silicon, iron and impurity elements; the inoculant contains silicon, aluminum, barium, carbon and impurity elements; the flow inoculant contains silicon, aluminum, bismuth, carbon and impurity elements.

[0027] In the above preparation method, the specific components of the rare earth nodulizer, inoculant and flow inoculant ca...

Embodiment 1

[0034] 1) Mix the steel scrap and the returned material according to the weight ratio of 100:80, and then preheat at 1100°C for 0.3h;

[0035] 2) melting the preheated raw material at 1530°C for 1 hour to obtain molten iron;

[0036] 3) Rare earth spheroidizing agent (containing 2% by weight of lanthanum, 8% by weight of magnesium, 3% by weight of calcium, 2% by weight of barium, 45% by weight of silicon, and the balance is iron and impurity elements), an inoculant (containing 75% by weight of silicon, 1% by weight of aluminum, 2.6% by weight of barium, and the balance being carbon and impurity elements) is added to molten iron and stirred to obtain inoculated molten iron, wherein the addition of the rare earth spheroidizer is 1% by weight, the addition of inoculant is 0.1% by weight;

[0037] 4) Add the flow inoculant (containing 75% by weight of silicon, 1% by weight of aluminum, 3.5% by weight of bismuth, and the balance is carbon and impurity elements) into the inoculated...

Embodiment 2

[0039] 1) Mix the steel scrap and the returned material according to the weight ratio of 100:75, and then preheat at 1050°C for 2 hours;

[0040] 2) melting the preheated raw material at 1500°C for 1 hour to produce molten iron;

[0041] 3) Rare earth spheroidizing agent (containing 0.5% by weight of cerium, 5% by weight of magnesium, 1% by weight of calcium, 1% by weight of barium, 40% by weight of silicon, and the balance is iron and impurity elements), an inoculant (containing 70% by weight of silicon, 0.5% by weight of aluminum, 2.2% by weight of barium, and the balance being carbon and impurity elements) is added to molten iron and stirred to obtain inoculated molten iron, wherein the addition of the rare earth spheroidizing agent is 0.5% by weight, the addition of inoculant is 0.15% by weight;

[0042] 4) Add the flow inoculant (containing 70% by weight of silicon, 0.5% by weight of aluminum, 3.2% by weight of bismuth, and the balance is carbon and impurity elements) in...

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Abstract

The invention discloses an as-cast high-strength ductile iron and a preparation method thereof. The method comprises: 1) preheating steel scrap and foundry returns at the temperature 1050-1150 degrees centigrade; 2) fusing the preheated raw material at the temperature 1500-1550 degrees centigrade to obtain molten iron; 3) adding rare-earth nodularizer and inoculant into the molten iron and stirring to obtain inoculated molten iron; 4) adding stream inoculant into the inoculated molten iron and casting to obtain as-cast high-strength ductile iron, wherein the rare-earth nodularizer contains rare earth element, magnesium, calcium, barium, silicon, iron and impurity elements; the inoculant contains silicon, aluminum, barium, carbon and impurity elements; the stream inoculant contains silicon, aluminum, bismuth, carbon and impurity elements. The ductile iron prepared by the method disclosed by the invention achieves high hardness, high tensile strength and high impact resistance.

Description

technical field [0001] The invention relates to nodular cast iron, in particular to as-cast high-strength nodular cast iron and a preparation method thereof. Background technique [0002] Ductile cast iron is spheroidal graphite obtained through spheroidization and inoculation treatment, which effectively improves the mechanical properties of cast iron, especially the plasticity and toughness, thereby obtaining superior mechanical strength compared with carbon steel. Ductile iron is a high-strength cast iron material developed in the 1950s. Its comprehensive performance is close to that of steel, which makes it successfully used for casting castings with complex stress, high strength, toughness and wear resistance. [0003] At present, the most widely used ductile iron in this field is the ductile iron of grade 700-2 conforming to the international standard ENGJS / UNE-EN1563, but the strength of the ductile iron is often difficult to meet the actual demand. Contents of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/04C22C33/08
CPCC22C33/08C22C37/04C22C37/06C22C37/08C22C37/10
Inventor 刘同顺唐加阁汪俊华郑浩
Owner YINFENG CASTING WUHU CO LTD
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