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Technology method for improving surface hardness of cylinder barrel of thin-wall gray pig iron air cylinder

A technology of surface hardness and process method, which is applied in the field of gray cast iron smelting, can solve problems such as increased production cost, difficult processing for customers, and difficult processing, so as to reduce production cost and waste loss, suppress whitening defects, and improve strength and hardness Effect

Inactive Publication Date: 2017-11-17
WUHU YONGDA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the reduction of CE and the addition of a large amount of alloys, the supercooling degree at the thinner wall position will be higher to form a local white structure, and the overall hardness of the casting will increase, making it difficult to process, resulting in processing difficulties or even chipping for customers.
At the same time, due to the addition of a large number of alloys, the production cost increases

Method used

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  • Technology method for improving surface hardness of cylinder barrel of thin-wall gray pig iron air cylinder
  • Technology method for improving surface hardness of cylinder barrel of thin-wall gray pig iron air cylinder
  • Technology method for improving surface hardness of cylinder barrel of thin-wall gray pig iron air cylinder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] This embodiment includes the following steps:

[0017] First of all, ingredients: high-quality steel scrap and returned iron are selected as the main raw materials. The weight ratio of the scrap steel and the returned iron is 1:1.1. The weight of the scrap steel is 3050Kg, and the weight of the returned iron is 3355Kg. Distribute carbon, ferrosilicon, ferromanganese, sulfur iron, phosphorus iron, copper, chromium, tin iron, titanium iron alloy components according to the composition of molten iron, so that each alloy composition is controlled in the following range by weight percentage: carbon 3.1%; silicon 2% %; manganese 0.6%; sulfur 0.08%; phosphorus 0.02%; copper 0.4%; chromium 0.02%; tin 0.08%; titanium 0.03%, and the balance is iron. Then smelting: use intermediate frequency furnace for smelting, add the mixture of scrap steel and returned iron into the furnace, add carbon, ferrosilicon, ferromanganese, ferrosulfur, ferrophosphorus, copper, chromium, iron tin, fer...

Embodiment 2

[0022] This embodiment includes the following steps:

[0023] Ingredients: Select high-quality steel scrap and returned iron as the main raw materials. The weight ratio of the scrap and returned iron is 1:1.2. The weight of scrap steel is 3050Kg, and the weight of returned iron is 3660Kg. Allocation of carbon, ferrosilicon, ferromanganese, sulfur iron, phosphorus iron, copper, chromium, tin iron, titanium iron alloy components according to the composition of molten iron, so that each alloy composition is controlled in the following range by weight percentage: carbon 4.1%; silicon 1.8% %; Manganese 0.65%; Sulfur 0.04%; Phosphorus 0.025%; Copper 0.6%; Chromium 0.03%; Tin 0.07%; Add the mixture into the furnace, and add carbon, ferrosilicon, ferromanganese, ferrosulfur, ferrophosphorus, copper, chromium, tin-iron, and ferro-titanium in sequence when it is melted, heat the molten iron to 1520°C, keep it warm for 5 minutes, and then cool it down to 1480°C ;Inject molten iron at a ...

Embodiment 3

[0027] This embodiment includes the following steps:

[0028] Ingredients: Select high-quality steel scrap and returned iron as the main raw materials. The weight ratio of the scrap and returned iron is 1:1.15. The weight of scrap steel is 3050Kg, and the weight of returned iron is 3510Kg. Distribute carbon, ferrosilicon, ferromanganese, sulfur iron, phosphorus iron, copper, chromium, tin iron, and titanium iron alloy components according to the composition of molten iron, so that each alloy composition is controlled in the following range by weight percentage: carbon: 3.5%; silicon : 1.9%; Manganese: 0.63%; Sulfur: 0.06%; Phosphorus: 0.023%; Copper: 0.5%; Chromium: 0.025%; Tin: 0.075%; The mixture of scrap steel and returned iron is added into the furnace, and when it is melted, carbon, ferrosilicon, ferromanganese, ferrosulfur, ferrophosphorus, copper, chromium, iron tin, and ferro-titanium are added in sequence, and the temperature of the molten iron is heated to 1510°C and...

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Abstract

The invention belongs to the technical field of gray cast iron smelting, and in particular relates to a process method for improving the surface hardness of a thin-walled gray cast iron cylinder barrel. It includes batching, smelting, forming and cooling steps. The batching is made of high-quality scrap steel and returned iron as the main raw materials. The weight ratio of scrap steel and returned iron is 1:1.1-1.2, and the composition of each alloy is controlled by weight percentage: Carbon: 3.1-4.1 %; silicon: 1.8‑2%; manganese: 0.6‑0.65%; sulfur: 0.04‑0.08%; phosphorus: 0.02‑0.025%; copper: 0.4‑0.6%; ;Titanium: less than or equal to 0.03%, the balance is iron. The invention adds copper and tin alloys to the ingredients, uses low-titanium scrap steel to control the titanium content, effectively suppresses the whitening of thin-walled parts of castings, greatly improves the strength and hardness of castings, and effectively reduces production costs.

Description

technical field [0001] The invention belongs to the technical field of gray cast iron smelting, and in particular relates to a process method for improving the surface hardness of a thin-walled gray cast iron cylinder barrel. Background technique [0002] In casting production, the strength and hardness of castings are closely related to the average wall thickness of castings. Generally, the position with thicker wall thickness is stronger than the position with thinner wall thickness. The general way to improve the strength and hardness is to reduce the carbon equivalent (CE) and add alloys that promote the formation of pearlite, such as Cu, Sn, etc. However, with the reduction of CE and the addition of a large amount of alloys, the undercooling degree at the thinner wall position will be higher to form a local white structure, and the overall hardness of the casting will increase, making it difficult to process, resulting in processing difficulties or even chipping for cu...

Claims

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Application Information

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IPC IPC(8): C22C33/08C22C37/10C22C37/06
CPCC22C33/08C22C37/06C22C37/10
Inventor 董汉云
Owner WUHU YONGDA TECH
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