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Synthesis and preparation process for high-silicon-molybdenum ductile iron material

A preparation process, high-silicon-molybdenum technology, applied in the field of metal materials, can solve the problems of high-silicon-molybdenum ductile iron impact toughness requirements, high production costs, unqualified, etc., to improve mechanical properties, prevent oxidation burning loss, promote melting and Diffusion effect

Active Publication Date: 2016-12-14
KOCEL EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there are strict requirements for ordinary pig iron, and the production cost is relatively high
At the same time, high-silicon-molybdenum ductile iron has impact toughness requirements, and often fails to meet the requirements.

Method used

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  • Synthesis and preparation process for high-silicon-molybdenum ductile iron material
  • Synthesis and preparation process for high-silicon-molybdenum ductile iron material
  • Synthesis and preparation process for high-silicon-molybdenum ductile iron material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The mass percent content of each component of the high silicon molybdenum ductile iron material in this embodiment is C: 3.495%; Si: 2.73%; Mo: 0.408%%; P: <0.03%; S: <0.015%; Mn: 0.266%; Mg: 0.0401%, Sb: 0.001%, and the rest is Fe.

[0027] The synthetic preparation process of the high silicon molybdenum ductile iron material of the present embodiment comprises the following steps:

[0028] Step 1: Prepare raw materials with the following mass percentages: steel scrap 68%; pig iron 28%; ferrosilicon 1%, ferromolybdenum 1.0%; recarburizer 2%. Step 2: Smelting: During the melting process of raw materials, the furnace charge is added in batches: the first batch adds all the pig iron and 1 / 3 of the quality of scrap steel; after the furnace charge is melted, add the second batch of furnace charge: 5 / 11 of the quality Carburizer and 1 / 3 of the quality of steel scrap, in which the scrap steel is pressed on the surface of the carburizer and added by carbon pressing, that is, ...

Embodiment 2

[0035]The difference between this embodiment and embodiment 1 mainly lies in the following aspects:

[0036] The composition of the high silicon molybdenum ductile iron material in the present embodiment is:

[0037] C: 3.48%; Si: 2.73%; Mo: 0.423%; P: <0.03%; S: <0.015%; Mn: 0.251%;

[0038] The quality ratio of raw materials is: scrap steel 61%; pig iron 26%; ferrosilicon 1.2%, ferromolybdenum 1.3%; recarburizer 2.5%.

[0039] Table 3 shows the test results of the mechanical properties of the test block after the material of this embodiment was smelted and poured.

[0040] table 3

[0041]

Embodiment 3

[0043] The difference between this embodiment and embodiment 1 mainly lies in the following aspects:

[0044] The composition of the high silicon molybdenum ductile iron material in the present embodiment is:

[0045] C: 3.4%; Si: 2.79%; Mo: 0.472%; P: <0.03%; S: <0.015%; Mn: 0.263%;

[0046] The quality ratio of raw materials is: scrap steel 61%; pig iron 30.4%; ferrosilicon 1.1%, ferromolybdenum 1.2%; recarburizer 2.3%.

[0047] The mechanical performance test results of the test block after the material smelting and pouring of the present embodiment are as described in Table 4

[0048] Table 4

[0049]

[0050] image 3 It is the nodularization rate figure of the high silicon molybdenum nodular iron material of the present embodiment, Figure 4 It is the metallographic structure diagram of the high silicon molybdenum ductile iron material of this embodiment.

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Abstract

The invention relates to a synthesis and preparation process for a high-silicon-molybdenum ductile iron material. The synthesis and preparation process specially comprises the following steps that raw materials are prepared, and the raw materials comprise, by mass, 60%-70% of scrap steel, 25%-35% of cast iron, 1%-1.2% of silicon iron, 1%-1.3% of ferro-molybdenum and 2%-2.5% of carburant; in the raw material melting process, furnace burdens are added in three batches; all the cast iron and 1 / 3 mass part of scrap steel are added in the first batch of furnace burdens, 5 / 11 mass part of carburant and 1 / 3 mass part of scrap steel are added in the second batch of furnace burdens, and 5 / 11 mass part of carburant and 1 / 3 mass part of scrap steel are added in the third batch of furnace burdens; after the third batch of furnace burdens are completely molten down, all the silicon iron and ferro-molybdenum are added, and when the temperature of molten iron rises to 1400-1410 DEG C, the remaining 1 / 11 mass part of carburant is added in a mirror surface mode after slagging-off impurity removal; and sampling analysis, blending, tapping, nodulizing and inoculation treatment are performed until pouring is completed. According to the process, the scrap steel is used as a main raw material, and the joint carbon adding mode of middle adding and mirror surface adding is adopted for preparing high-silicon-molybdenum ductile cast iron with high strength and high impact toughness.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a synthesis and preparation process of a high-silicon-molybdenum ductile iron material. Background technique [0002] High-silicon-molybdenum ductile iron has high high-temperature strength, thermal fatigue resistance, excellent high-temperature oxidation resistance, and good high-temperature creep resistance, so it is used in exhaust pipes, turbine shells, and medium-pressure outer cylinders. widely used in components. Due to the high content of silicon and molybdenum, it is more brittle, and it is easy to produce fragmented graphite and graphite deterioration layer. Due to the restriction of high silicon and low carbon, it is also easy to produce microscopic shrinkage. [0003] Chinese patent document CN105154759A discloses a high-silicon-molybdenum ductile iron, which contains 3.3-3.5% carbon, 3.0-3.2% silicon, less than 0.1% manganese, less than 0.04% phosphorus, less than 0.0...

Claims

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Application Information

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IPC IPC(8): C22C37/04C22C37/10C22C33/10
CPCC22C33/10C22C37/04C22C37/10
Inventor 董福元尤国庆韩军郭亮潘俊
Owner KOCEL EQUIP
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