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Manufacturing method of heat-resistant high-silicon-molybdenum nodular cast iron

A technology of nodular cast iron and high silicon molybdenum, which is applied in the direction of improving process efficiency, can solve the problems of not being overcome, increasing production costs, increasing production processes, etc., and achieves the effects of improving durability, strength, and creep resistance

Active Publication Date: 2014-11-12
KOCEL EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to improve the roundness of graphite and eliminate fragmented graphite, this technology is to add Sn and Sb micro-alloying elements during inoculation, which not only increases the production process, but also increases the production cost.
[0004] There is currently no method to overcome the above drawbacks

Method used

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  • Manufacturing method of heat-resistant high-silicon-molybdenum nodular cast iron
  • Manufacturing method of heat-resistant high-silicon-molybdenum nodular cast iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment one: a kind of preparation method of high-silicon-molybdenum heat-resistant ductile iron, the method comprises the following steps:

[0028] a. Determine chemical parameters: carbon 3.2-3.4%, silicon 3.7-4.3%, manganese ≤ 0.3%, phosphorus ≤ 0.05%, sulfur 0.007-0.12%, magnesium 0.04-0.55%, molybdenum 0.8-1.2%;

[0029] b. Raw materials and weight percentages are: pig iron: 30-40%, scrap steel: 20-30%, recycle materials: 30-40%, ferrosilicon: 1.5-2.0%, ferromolybdenum: 1-1.2%;

[0030] c. Melting:

[0031] 1) Use an intermediate frequency electric furnace for smelting, use an electronic scale to weigh main raw materials such as pig iron, scrap steel, machine iron, etc., and add the materials in the order of scrap steel-return material-pig iron to ensure stable material quality; after melting, heat up and take samples for testing, and the sampling temperature is controlled at 1420- Between 1440°C; the overheating temperature is guaranteed to be between 1480-150...

example example 2 6

[0046] (1) Each example is basically the same as Example 1, the difference is that there are some changes in the parameters and mechanical properties in the actual control, the chemical composition and content are shown in the table below

[0047] chemical composition

Example 2

Example 3

Example 4

Example 5

Example 6

C

3.25

3.28

3.35

3.3

3.2

Si

4.01

3.9

3.95

4.05

4

mn

0.1

0.11

0.098

0.092

0.11

P

0.035

0.032

0.034

0.031

0.033

S

0.01

0.011

0.095

0.01

0.088

Mg

0.045

0.05

0.051

0.049

0.052

Mo

0.98

0.95

1.02

1.08

0.93

[0048] (2) The normal temperature performance of the material is shown in the table below

[0049]

[0050] (3) The high temperature performance of the material is shown in the following table:

[0051] temperature(°C)

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Abstract

The invention relates to a manufacturing method of nodular cast iron for high-temperature parts of combustion engines, in particular to a manufacturing method of heat-resistant high-silicon-molybdenum nodular cast iron. The method comprises the following steps that chemical parameters, raw materials and weight percentage compositions are determined, wherein the nodular cast iron comprises, by weight, 30 percent-40 percent of pig iron, 20 percent-30 percent of scrap steel, 30 percent-40 percent of foundry returns, 1.5 percent-2.0 percent of silicon iron and 1 percent-1.2 percent of ferromolybdenum, and smelting, modification treatment, aging stress relieving technologies are performed. The method is unique, the creep resistance and endurance property of the material are improved, the intensity of the material is enhanced, and the service life of the material is prolonged; the influence on the graphite form by rare earth elements is relieved, the graphite roundness is improved, the fragmentation effect of graphite is relieved, the manufacturing cost and processing costs are reduced, and environmental friendliness and energy saving are facilitated.

Description

technical field [0001] The invention relates to a preparation method of a ductile iron casting used for high-temperature parts of an internal combustion engine, in particular to a preparation method of a high-silicon-molybdenum heat-resistant ductile iron. Background technique [0002] High-silicon-molybdenum ductile iron materials are mainly used in high-temperature resistant components of internal combustion engines and power generation equipment. High-silicon-molybdenum materials have better properties due to the following properties, such as: high-temperature strength, high-temperature toughness, thermal fatigue, high-temperature creep resistance, and oxidation growth resistance. sex, so it is very popular. [0003] Regarding high-silicon-molybdenum materials, domestic enterprises and colleges and universities have conducted in-depth research on them. The existing technology closest to the present invention has an invention patent: the publication number is CN102978507A,...

Claims

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Application Information

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IPC IPC(8): C22C33/10C22C37/04C21D5/00
CPCY02P10/20
Inventor 尤国庆张守全周文军孙升郭亮潘骏
Owner KOCEL EQUIP
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