Process for producing gray cast iron with high carbon equivalent, low alloy and middle-high strength

A high-carbon equivalent, low-alloy technology, applied in the field of medium and high-strength gray cast iron, low alloy, and high carbon equivalent, can solve the problems of low mechanical properties of high-carbon equivalent gray cast iron, and achieve improved mechanical properties, good vibration absorption, and heat resistance Less prone to cracking

Active Publication Date: 2008-10-22
山西恒泰制动器股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of low mechanical properties of high carbon equivalent gray cast iron produced by the prior ar

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: add following raw material component (every part 5 kilograms, adopt the electric furnace of 0.5 ton) in the furnace: 20 parts of low-silicon foundry pig iron, 40 parts of steel scrap, 40 parts of scrap iron parts, 1.5 parts of recarburizer for foundry, The carbon content of the charge in the furnace is 3.85%, and the silicon content is 1.11%.

[0037] Raise the temperature to 1500-1550°C, add 0.4 part of 75# ferrosilicon for casting, 0.3 part of 65# ferromanganese for casting, 0.3 part of 60# ferrochrome for casting, and 0.3 part of electrolytic copper; The chemical composition is: 3.78% carbon, 1.40% silicon, 0.67% manganese, 0.04% sulfur, 0.078% phosphorus, 0.27% chromium, 0.47% copper.

[0038] After the second inoculant treatment in the large bag and small bag, the amount of inoculant added in the large bag is per 100 kg of molten iron: 0.1 kg of rare earth ferrosilicon alloy for casting, 0.12 kg of ferromanganese, 0.35 kg of silicon calcium barium ino...

Embodiment 2

[0044] Embodiment 2: Add the following raw material components in the furnace (10 kilograms per part, adopting an electric furnace of 1 ton): 40 parts of low-silicon pig iron, 30 parts of scrap steel, 30 parts of scrap iron, 1 part of recarburizer for casting, and The carbon content of the inner charge is 3.84%, and the silicon content is 1.14%.

[0045] Raise the temperature to 1500-1550°C, add 0.4 part of 75# ferrosilicon for casting, 0.3 part of 65# ferromanganese for casting, 0.3 part of 60# ferrochrome for casting, and 0.3 part of electrolytic copper; The chemical composition is: 3.76% carbon, 1.42% silicon, 0.61% manganese, 0.042% sulfur, 0.096% phosphorus, 0.25% chromium, 0.43% copper.

[0046] After the second inoculant treatment in the large bag and the small bag, the amount of the large bag inoculant is added per 100 kg of molten iron: the large bag inoculant: 0.20 kg of rare earth ferrosilicon alloy for casting, 0.20 kg of ferromanganese, and 0.30 kg of silicon calc...

Embodiment 3

[0052] Embodiment 3: Add the following raw material components in the furnace (30 kg per part, using a 3-ton electric furnace): 35 parts of low-silicon pig iron, 35 parts of scrap steel, 25 parts of scrap iron, 1.3 parts of recarburizer for casting, The carbon content of the charge is 3.86%, and the silicon content is 1.06%.

[0053] Raise the temperature to 1500-1550°C, add 0.5 part of 75# ferrosilicon for casting, 0.4 part of 65# ferromanganese for casting, 0.4 part of 60# ferrochrome for casting, and 0.4 part of electrolytic copper; The chemical composition is: 3.78% carbon, 1.42% silicon, 0.65% manganese, 0.04% sulfur, 0.093% phosphorus, 0.29% chromium, 0.50% copper.

[0054]After the second inoculant treatment in the large bag and small bag, the amount of inoculant added in the large bag is per 100 kg of molten iron: 0.20 kg of rare earth ferrosilicon alloy for casting, 0.10 kg of ferromanganese, 0.25 kg of silicon calcium barium inoculant, small bag of inoculant The amo...

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Abstract

The invention belongs to the gray cast iron production method technical field, and in particular relates to a method for producing gray cast iron with high carbon equivalent, low alloy and mid-high strength, which solves the problem that the high carbon equivalent gray cast iron produced by adopting the prior art is low in mechanical property. Pig iron added in the method of the invention is low-silicon casting pig iron instead of mid-high silicon casting pig iron used in the casting tradition, and discharge liquid iron in the method is high-carbon liquid iron. When the discharge liquid iron is poured into a big ladle, self-made special composite inoculant made from rare earth ferro-silicon alloy, ferromanganese and silicon-calcium-barium inoculant is added to the stream, which greatly improves the mechanical property of the gray cast iron. The method solves the acknowledged difficult problem in the casting community that the gray cast iron is very low in mechanical property within the range of high carbon equivalent component. As new casting material, iron castings produced through the method can be popularized and applied on brake discs or brake hubs of automobiles in large quantities.

Description

technical field [0001] The invention belongs to the technical field of gray cast iron production methods, and in particular relates to a method for producing gray cast iron with high carbon equivalent, low alloy and medium-high strength. Background technique [0002] The pig iron mainly used in traditional gray cast iron production is medium and high silicon (containing 1.60-2.80% silicon) foundry pig iron. In order to ensure the mechanical properties of gray cast iron to achieve medium and high strength, low carbon equivalent (2.90-3.50% carbon, 1.70-2.30% silicon) and low alloying are generally used. Using the traditional gray cast iron production method, when high carbon equivalent (such as: 3.70~3.95% carbon, 1.60~2.10% silicon) is used, the mechanical properties of the produced gray iron parts are low, and the mechanical properties that can generally be obtained are: tensile strength σ b <150MPa; hardness HB<160, which cannot meet the requirements for the use of...

Claims

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Application Information

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IPC IPC(8): C22C33/08
Inventor 李世荣赵建国
Owner 山西恒泰制动器股份有限公司
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