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Low tin silicon molybdenum vermicular graphite cast iron and preparation method thereof

A technology of vermicular graphite cast iron and tin-silicon, which is applied in the field of low-tin-silicon-molybdenum vermicular graphite cast iron and its preparation, can solve the problems of unstable vermicular treatment, hindering popularization and application, and poor comprehensive performance, and achieves low investment cost, High creep rate, excellent wear resistance and thermal fatigue resistance

Active Publication Date: 2017-11-14
苏州勤堡精密机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the low creep rate and poor comprehensive performance of traditional vermicular cast iron, its popularization and application are seriously hindered.
Although a lot of work has been done on vermicular cast iron at home and abroad, and many achievements have been made, many difficulties have been encountered in the process of popularizing and applying this material in industry, mainly manifested in the instability of vermicular treatment and the instability of vermicular treatment during the preparation of the material. The conversion rate is low and difficult to control, and the overall performance is poor

Method used

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  • Low tin silicon molybdenum vermicular graphite cast iron and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027]A low-tin-silicon-molybdenum vermicular graphite cast iron, said low-tin-silicon-molybdenum vermicular graphite cast iron is composed of the following components by weight percentage: carbon is 3.55%, silicon is 2.2%, molybdenum is 0.15%, manganese is 0.27%, niobium is 0.24%, 0.15% chromium, 0.025% tin, 0.023% antimony, 0.14% vanadium, 0.18% titanium, the total content of phosphorus and sulfur does not exceed 0.06%, and the balance is iron and its unavoidable impurities, Described low tin silicon molybdenum vermicular graphite cast iron is made through the following steps:

[0028] Step 1. Raw material preparation and molten iron smelting. When molten iron is smelted, put the raw material iron into the converter to heat and melt. Add decarburizer, desulfurizer and deoxidizer to the pool to decarburize, desulfurize and deoxidize the molten iron in the pool;

[0029] Step 2. After the decarburization, desulfurization and deoxidation processes are completed, the temperatur...

Embodiment 2

[0038] A kind of low tin silicon molybdenum vermicular graphite cast iron, described low tin silicon molybdenum vermicular graphite cast iron is made up of following composition by weight percentage: carbon is 3.4%, silicon is 2.1%, molybdenum is 0.3%, manganese is 0.3%, niobium is 0.2%, chromium is 0.2%, tin is 0.01%, antimony is 0.01%, vanadium is 0.1%, titanium is 0.25%, the total content of phosphorus and sulfur is not more than 0.06%, and the balance is iron and its unavoidable impurities. Described low tin silicon molybdenum vermicular graphite cast iron is made through the following steps:

[0039] Step 1. Raw material preparation and molten iron smelting. When molten iron is smelted, put the raw material iron into the converter to heat and melt. Add decarburizer, desulfurizer and deoxidizer to the pool to decarburize, desulfurize and deoxidize the molten iron in the pool;

[0040] Step 2. After the decarburization, desulfurization and deoxidation processes are complet...

Embodiment 3

[0049] A low-tin-silicon-molybdenum vermicular graphite cast iron, the low-tin-silicon-molybdenum vermicular graphite cast iron is composed of the following components by weight percentage: carbon is 3.8%, silicon is 2.6%, molybdenum is 0.1%, manganese is 0.2%, niobium is 0.3%, 0.1% chromium, 0.03% tin, 0.28% antimony, 0.18% vanadium, 0.15% titanium, the total content of phosphorus and sulfur does not exceed 0.06%, and the balance is iron and its unavoidable impurities. Described low tin silicon molybdenum vermicular graphite cast iron is made through the following steps:

[0050] Step 1. Raw material preparation and molten iron smelting. When molten iron is smelted, put the raw material iron into the converter to heat and melt. Add decarburizer, desulfurizer and deoxidizer to the pool to decarburize, desulfurize and deoxidize the molten iron in the pool;

[0051] Step 2. After the decarburization, desulfurization and deoxidation processes are completed, the temperature of th...

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Abstract

The invention discloses a low-tin-silicon-molybdenum vermicular graphite cast iron. The low-tin-silicon-molybdenum vermicular graphite cast iron consists of the following components by weight percentage: 3.4-3.8% of carbon, 2.1-2.6% of silicon, and 0.1-2.6% of molybdenum 0.3%, manganese 0.2‑0.3%, niobium 0.2‑0.3%, chromium 0.1‑0.2%, tin 0.01‑0.03%, antimony 0.01‑028%, vanadium 0.1‑0.18%, titanium 0.15‑0.25 %, the total content of phosphorus and sulfur does not exceed 0.06%, and the balance is iron and its unavoidable impurities. The low-tin-silicon-molybdenum vermicular graphite cast iron of the present invention has a small whiting tendency and a small length-thickness ratio of the vermicular graphite, so that the low-tin-silicon-molybdenum vermicular graphite cast iron has excellent strength, wear resistance and thermal fatigue resistance. At the same time, the present invention also provides a method for preparing the above-mentioned low-tin-silicon-molybdenum vermicular graphite cast iron, so that the obtained low-tin-silicon-molybdenum vermicular graphite cast iron has high creep rate, good comprehensive performance, simple process operation, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the field of material metallurgy, in particular to a low-tin-silicon-molybdenum vermicular graphite cast iron and a preparation method thereof. Background technique [0002] Modern diesel engines have the characteristics of high power per liter, compact structure, complex casting shapes, large heat loads, and high degrees of reinforcement. New updates have been made not only to the design technology, but also to the materials and manufacturing technologies of critical parts such as the diesel engine body and cylinder head. High requirements require that materials not only have high room temperature and high temperature mechanical properties, excellent thermal conductivity and shock absorption properties, and excellent thermal fatigue properties, but also require high compactness, uniformity, and reliability. The shapes of graphite in cast iron are flake, worm and spherical. Vermicular graphite is an intermediate form of graphit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C22C33/08
Inventor 李娟
Owner 苏州勤堡精密机械有限公司
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