High-carbon-content and easily-cut steel for engineering machinery and production method thereof

A construction machinery and free-cutting technology, applied in the field of alloy steel materials, can solve the problems of large loss of abrasive tools, inability to meet cutting requirements, difficult machining accuracy, etc., to reduce machining loss, improve yield, production efficiency, and machining performance. Good results

Inactive Publication Date: 2018-09-07
CHANGSHU LONGTENG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Good surface morphology and strict dimensional accuracy meet the needs of accurate operation on the stamping process and automated production line. Due to the high strength requirements of steel, the abrasive tool loss is large and the machining accuracy is difficult in the stamping process. Traditional high carbon steel Unable to meet the cutting requirements of its steel

Method used

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  • High-carbon-content and easily-cut steel for engineering machinery and production method thereof
  • High-carbon-content and easily-cut steel for engineering machinery and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0015] The preparation method of the above-mentioned high-carbon free-cutting engineering machinery steel comprises the following steps: (a) carrying out converter steelmaking with molten iron and steel scrap as raw materials to obtain molten steel; the tapping temperature of the molten steel is 1620-1680°C, and the molten steel Add 1 to 2 kg of ferrosilicon, 3 to 5 kg of lime, 7 to 8 kg of silicon manganese and 5 to 7 kg of low-nitrogen recarburizer to each ton of molten steel during tapping, and control the mass percentage content of C in the molten steel to 0.10 to 0.40 %, the mass percentage content of P is 0.001-0.020% and the mass percentage content of S is 0.005-0.030%; (b) performing LF refining on the molten steel, and the LF refining includes using auxiliary materials to make white slag to deoxidize the molten steel , the amount of the auxiliary materials added is 1-3kg of lime and 0.5-2.0kg of calcium carbide particles per ton of molten steel; the temperature of the ...

Embodiment 1- Embodiment 3、 comparative example 1

[0018] Embodiment 1-Example 3 and Comparative Example 1 provide a kind of high-carbon free-cutting engineering machinery steel respectively, and its chemical composition is as shown in Table 1:

[0019] Table 1 Chemical composition table of high-carbon free-cutting engineering machinery steel in Example 1-Example 3 and Comparative Example 1

[0020] Content (wt%)

Example 1

Example 2

Example 3

Comparative example 1

C

0.78

0.80

0.82

0.80

Si

0.20

0.19

0.19

0.19

mn

0.64

0.65

0.63

0.67

P

0.009

0.010

0.013

0.018

S

0.029

0.023

0.028

0.003

[0021] The above-mentioned high-carbon free-cutting construction machinery steel is prepared by the following method, which specifically includes the following steps:

[0022] (a) Carry out converter steelmaking with molten iron and steel scrap as raw materials to obtain molten steel; the tapping temperature of the molten steel...

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Abstract

The invention discloses high-carbon-content and easily-cut steel for engineering machinery and a production method thereof. The high-carbon-content and easily-cut steel for engineering machinery comprises the following chemical components of, by mass, 0.75-0.85% of C, 0.15-0.35% of Si, 0.55-0.75% of Mn, 0.020-0.030% of S, 0-0.025% of P, and the balance Fe and unavoidable impurities. Especially, the contents of C and S are high, the steel for engineering machinery is uniform, high in cleanliness, good in mechanical intensity and good in machining performance. Meanwhile, the preparation method of the high-carbon-content and easily-cut steel for engineering machinery can ensure the effect that material gas, occluded foreign substances, mechanical property and the like meet the requirements ofhigh precision and high efficiency stamping forming of steel, can ensure the steel quality of the high-carbon-content and easily-cut steel for engineering machinery, improves the yield and productionefficiency, saves resources, reduces the machining loss, protects the environment and saves the production cost of users.

Description

technical field [0001] The invention belongs to the field of alloy steel materials and relates to a steel for construction machinery, in particular to a high-carbon free-cutting steel for construction machinery and a production method thereof. Background technique [0002] The steel types of construction machinery steel are generally high-carbon high-quality carbon structural steel and alloy structural steel. Construction machinery steel is widely used in mining and various engineering construction equipment, such as drilling rigs, electric shovels, electric wheel dump trucks, excavators, loaders, bulldozers, various cranes and coal mine hydraulic supports and other mechanical equipment; its main Structural parts are subject to complex and variable cyclic loads, which require their component materials to have high yield strength and fatigue strength, good impact toughness, cold formability and excellent weldability. Good surface morphology and strict dimensional accuracy me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C33/06C21C7/06
CPCC21C7/06C22C33/06C22C38/02C22C38/04Y02P10/20
Inventor 丁振涛范耀东季丙元沈克李鹏刘荣泉
Owner CHANGSHU LONGTENG SPECIAL STEEL
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