CN103695767A

CN103695767A - Bainite steel

Info

Publication number: CN103695767A
Application number: CN201310693471.0A
Authority: CN
Inventors: 王小宁; 刘德良; 张长军; 赵浩坤
Original assignee: NINGXIA WEAR CASTING Co Ltd
Current assignee: NINGXIA WEAR CASTING Co Ltd
Priority date: 2013-12-18
Filing date: 2013-12-18
Publication date: 2014-04-02

Abstract

The invention provides bainite steel. The bainite steel comprises the following elements in percentage by weight: higher than or equal to 0.1% and less than or equal to 0.45% of carbon, higher than or equal to 1. 5% and less than or equal to 2.0% of silicon, higher than or equal to 2.5% and less than 3.0% of manganese, higher than or equal to 0.3% and less than 0.6% of molybdenum, 0.2%-0.5% of trace elements and the balance of iron. The mechanical properties of the bainite steel provided by the invention are as follows: the tensile strength Rm is higher than or equal to 1200Mpa, the impact toughness akv is higher than or equal to 80J, and the wear-resisting property is four times greater than that of the ZG30SiMn.

Description

Bainitic steel

technical field:

The present invention relates to field of novel, particularly a kind of bainitic steel.

background technology:

Along with scientific and technological development, society and industry manufacture field are also more and more higher to the demand of various materials, also more and more stricter to the performance requriements of material, and steel are rich anies influential family for material, the development of steel is most important to the development of material, is promoting the development of whole material circle.Bainitic steel is a kind of novel material, and the method that obtains bainite mainly contains Isothermal Hot and processes and cast bainitic steel, by alloying element, is casting bainitic steel, owing to obtaining the unstable of bainite structure, often causes poor impact toughness, and wear resistance is not high.

summary of the invention:

In view of this, be necessary to provide a kind of bainitic steel.

A kind of bainitic steel, comprise carbon, element silicon, manganese element, molybdenum element, trace element and ferro element, wherein, take weight percent as unit, and carbon content is 0.1≤carbon content≤0.45, and silicone content is 1.5≤silicone content≤2.0, manganese content is 2.5≤manganese content < 3.0, molybdenum content is 0.3≤molybdenum content < 0.6, micro-0.2-0.5, and all the other are iron.

Bainite Heat Treatment Of Steel comprises heating, insulation and cooling three processes, bainitic steel heats, is incubated processing under vacuum environment, adopt the normalizing of 910 degrees Celsius to 930 degrees Celsius, be cooled to below 100 degrees Celsius, adopt the tempering of 600 degrees Celsius to 700 degrees Celsius, 910 degrees Celsius to 930 degrees Celsius quenchings, 250 degrees Celsius to 350 degrees Celsius low-temperaturetemperings, are cooled to normal temperature.

Bainitic steel adopts electric arc furnace refining to form, and in refining process, according to weight percent, calculates, and the content of sulphur is controlled as sulphur content≤0.025, and the content of phosphorus is controlled as phosphorus content≤0.025.

Carbon in the present invention has impact clearly for the performance of steel, improves carbon content and can improve intensity and resistance to abrasion, but reduce the plasticity and toughness of steel, so carbon content control is 0.1-0.45%; Silicon suppresses separating out of carbon compound, impels the formation of paralympic film, and strengthening simultaneously forms the ferrite of bainite, and the intensity of steel is had to important impact, is the principal element that forms bainite, and silicone content scope control is at 1.5-2.0%; Manganese can be heightened the hardening capacity of steel, and strengthens bainite structure, contributes to the raising of fastness to wear and the intensity of steel, and the content range of manganese is 2.5-3.0%.

The mechanical property that bainitic steel provided by the invention reaches is: tensile strength tensile strength Rm >=1200Mpa, impelling strength akv >=80J; Wear resisting property is greater than the more than 4 times of ZG30SiMn.

embodiment:

Bainitic steel, comprise carbon, element silicon, manganese element, molybdenum element, trace element and ferro element, wherein, take weight percent as unit, and carbon content is 0.1≤carbon content≤0.45, and silicone content is 1.5≤silicone content≤2.0, manganese content is 2.5≤manganese content < 3.0, molybdenum content is 0.3≤molybdenum content < 0.6, micro-0.2-0.5, and all the other are iron.

Claims

1. a bainitic steel, it is characterized in that: bainitic steel comprises carbon, element silicon, manganese element, molybdenum element, trace element and ferro element, wherein, take weight percent as unit, and carbon content is 0.1≤carbon content≤0.45, and silicone content is 1.5≤silicone content≤2.0, manganese content is 2.5≤manganese content < 3.0, molybdenum content is 0.3≤molybdenum content < 0.6, micro-0.2-0.5, and all the other are iron.

2. bainitic steel as claimed in claim 1, it is characterized in that: bainite Heat Treatment Of Steel comprises heating, insulation and cooling three processes, bainitic steel heats, is incubated processing under vacuum environment, adopt the normalizing of 910 degrees Celsius to 930 degrees Celsius, be cooled to below 100 degrees Celsius, adopt the tempering of 600 degrees Celsius to 700 degrees Celsius, 910 degrees Celsius to 930 degrees Celsius quenchings, 250 degrees Celsius to 350 degrees Celsius low-temperaturetemperings, are cooled to normal temperature.

3. bainitic steel as claimed in claim 1, is characterized in that: bainitic steel adopts electric arc furnace refining to form, and in refining process, according to weight percent, calculates, and the content of sulphur is controlled as sulphur content≤0.025, and the content of phosphorus is controlled as phosphorus content≤0.025.