CN101586207B - Hot rolling wire rod for mechanical structure of 1600 Mpa level and manufacture method thereof - Google Patents
Hot rolling wire rod for mechanical structure of 1600 Mpa level and manufacture method thereof Download PDFInfo
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- CN101586207B CN101586207B CN200810037914XA CN200810037914A CN101586207B CN 101586207 B CN101586207 B CN 101586207B CN 200810037914X A CN200810037914X A CN 200810037914XA CN 200810037914 A CN200810037914 A CN 200810037914A CN 101586207 B CN101586207 B CN 101586207B
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Abstract
The invention provides a hot rolling wire rod for a mechanical structure of 1600 Mpa level and a manufacture method thereof. The hot rolling wire rod for the mechanical structure comprises the following chemical components by weight percent: 0.20 to 0.30 wt percent of C, 1.5 to 3.0 wt percent of Si, 2.0 to 4.0 wt percent of Mn, 0.20 to 0.30 wt percent of Mo, and the balance of Fe and unavoidable impurities. The invention adopts Mn-Si-Mo line components, and obtains the hot rolling wire rod taking an acicular martensite as a main tissue and containing a bainite of 5 percent to 10 percent as thecharacteristics at the same time through production procedures such as smelting, rough rolling, finish rolling and the like. The hot rolling wire rod has higher strength, excellent toughness and duct ility, the yield strength no less than 1300 Mpa, the tensile strength no less than1600 Mpa, the yield ratio no less than 0.70 percent, the elongation no less than 10.0 percent and the reduction of area no less than 50 percent.
Description
Technical field
The present invention relates to the ferrous materials class, specifically, the present invention relates to hot-strip, more particularly, the present invention relates to a kind of 1600MPa level physical construction hot rolling wire and manufacture method thereof.
Background technology
In recent years,, and economize on resources and eco-friendly Sustainable development, the demand of high-strength wire material and bar steel is increased day by day along with the high speed development of industry such as bridge, automobile and machinofacture.The major technique that improves wire rod and bar hardness of steel is alloying and improves carbon content.Alloying process is to improve the method that the intensity of steel generally adopts at present, by alloying element Ni, Cr, Mo, Si and Mn and microalloy element Nb, V, thereby the alloying strengthening effect of elements such as Ti improves the intensity and the toughness of steel, represent steel grade to be mainly spring steel, bolting steel etc., spring steel such as 60Si2CrVA, 50CrV4,55SiCr6 and 54SiCrV6, the intensity of this class steel generally can reach 1500MPa, and has toughness preferably, can cause material cost to improve but the shortcoming of alloying strengthening is the interpolation of a large amount of alloy elements, make metallurgical technology become complicated simultaneously.Improve the intensity that carbon content also can improve the steel cord, represent steel grade to mainly contain 82MnQL, 87MnQL and 82 steel cords etc., carbon content in the steel all 〉=0.80wt%, its intensity can reach about 1200MPa, be organized as the lamella perlite after the cold-drawn, it is not enough that this class steel in use often shows toughness, and the raising of its intensity also is restricted in addition.
Because the toughness of most rolled products of ordinary high-strength steel is not enough, this will shorten its work-ing life, thereby makes it to become the restraining factors that this type of steel is applied.Improve the toughness of high-strength steel.Can start with on the one hand, improve the cleanliness factor and the tissue homogeneous degree of steel, the inclusion that is difficult to remove is carried out modification or harmless treatment is the prerequisite and the basis of realizing the high malleableize of such steel from smelting.Can make the material microstructure super-refinement, thereby realize high malleableize, high-intensity purpose by controlled rolling, controlled chilling (being TMCP) technology on the other hand.The microstructure super-refinement is a kind ofly not only to improve intensity but also improve the flexible schedule of reinforcement.Because perlite and ferritic structure refinement can obtain high toughness, but its intensity improves little, and in the ordinary course of things, martensitic steel has higher intensity, but the structure refinement of martensite lath is difficulty relatively, technology is more complicated also, therefore, is to improve difficult point of martensitic steel flexible by the refinement martensitic stucture.
By retrieval, Japanese patent application JP2003105485 discloses a kind of spring steel, its chemical ingredients is: 0.4～0.9wt%C, 0.5～3wt%Si, 0.1～2wt%Mn, in addition the V of certain content, Cr, Ni, Ti, B and W element are being arranged, also contain≤0.02wt%P ,≤0.02wt%S, all the other are iron and unavoidable impurities, the tensile strength of this spring steel is 1800～2400Mpa, but its microstructure is sheet martensite and ferrite mixed structure.And its carbon content is higher, belongs to the medium high carbon spring steel, and in order to obtain high strength, this steel rolls the back and adopts 20～200 ℃/s quenching cooling fast, carries out 200 ℃ of following low-temperaturetemperings subsequently and handles.It is more that alloying element is added in this invention, and cost is higher; Cooling and low-temperaturetempering are handled fast, and this steel plasticity is relatively poor; In addition, quench, temper makes complex manufacturing, and be not easy to realize for big production.
Consider that steel for engineering mechanism purpose not only should have performances such as high strength, good toughness and plasticity, and be easy to produce, factor such as with low cost, the present inventor has added Mn, Si and low levels Mo in middle low carbon steel, in conjunction with microstructure super-refinement mechanism, and, designed a kind of 1600MPa level physical construction hot rolling wire, thereby finished the present invention by control to rolling technology.
One object of the present invention is to provide a kind of 1600MPa level physical construction hot rolling wire.
Another object of the present invention is to provide the manufacture method of described hot rolling wire.
Summary of the invention
First aspect of the present invention provides a kind of 1600MPa level physical construction hot rolling wire, described physical construction comprises with the chemical ingredients of hot rolling wire: C:0.20～0.30wt%, Si:1.5～3.0wt%, Mn:2.0～4.0wt%, Mo:0.20～0.30wt%, and surplus is Fe and unavoidable impurities; Described physical construction is made up of needle type martensite and bainite with the microstructure of hot rolling wire, and wherein the bainite volumn concentration is 5～10%.
In a preferred implementation: in described unavoidable impurities, S≤0.020%, P≤0.025%, O, N, H total amount＜50mg/kg.
Below, 1600MPa level physical construction of the present invention is done as being described in detail with the chemical ingredients of hot rolling wire.
C: have quite high intensity and good toughness in order to guarantee steel, to the carbon content in the steel certain restriction to be arranged, because the obdurability of steel depends primarily on its carbon content and weave construction, and the carbon of too high amount will reduce the toughness of steel, so the carbon content of wire rod of the present invention is controlled between 0.20～0.30wt%.
The effect of Si:Si in steel mainly is solution strengthening, the Si of high level can improve the hardening capacity of steel, adds intensity and the toughness that Si helps improving steel in the general steel, in addition, Si can increase the austenite quantity that reduces the hydrogen velocity of diffusion, and makes the steel can tempering under higher temperature.Therefore, Si content preferably is controlled between 1.5～3.0wt%.
The effect of Mn:Mn in steel is solution strengthening and the hardening capacity that improves steel, but the segregation of Mn tendency is higher, so Mn content is difficult for too highly, generally its content is controlled between 2.0～4.0wt%.
Mo: can improve the solidity to corrosion of steel, and can play the effect of precipitation strength, but because Mo price comparison costliness has only added a small amount of Mo in the wire rod of the present invention, add-on is 0.2～0.3wt%.
Second aspect of the present invention provides the manufacture method of a kind of 1600MPa level physical construction with hot rolling wire, this method comprises smelting, casting, heating, roughing, finish rolling operation, wherein in described roughing operation, roughing begins 1150～1180 ℃ of temperature ranges, rolls into the bar of φ 22 ± 0.5mm.
In a preferred implementation: the Heating temperature in the described heating process is 1200～1250 ℃, and soaking time is 110～130 minutes.
In a preferred implementation: in the described finish rolling operation, the final rolling temperature scope is 980～1020 ℃, rolls into the wire rod of φ 9 ± 0.3mm, rolls the back air cooling.
Beneficial effect of the present invention is:
1, steel grade of the present invention adopts the Mn-Si-Mo set member, and alloy species is common and consumption is few, and production cost is lower.
2, the cooperation by composition design and rolling technology, with the needle type martensite is main tissue, contain the hot rolling wire that bainite is a feature simultaneously, guaranteed that wire rod has higher intensity and good toughness, its yield strength 〉=1300MPa, tensile strength 〉=1600MPa, yield tensile ratio 〉=0.70, unit elongation 〉=10.0%, relative reduction in area 〉=50%.
3, because composition and technological design are reasonable, from implementation result, technical process is simplified, and process system is looser, can be on common production line stably manufactured.
4, hot rolling wire of the present invention is a kind of widely used structural steel, can be used as components of machine such as various mechanical springs, various bolts, can also be as high-strength wire rod, steel wire steel.If by following process, can be processed into machinery and use high-strength component, as the high strength worm screw, mechanical high strength component such as transmission shaft and high strength screw mandrel.
Description of drawings
Fig. 1 is the metallographic microstructure photo (1000 *) of the embodiment of the invention 2.
Embodiment
Below for a more detailed description to the present invention in conjunction with the accompanying drawings with embodiment.These embodiment only are the descriptions to best mode for carrying out the invention, scope of the present invention are not had any restriction.
Embodiment 1
Press the smelting molten steel in the vacuum electromagnetic induction furnace of the chemical ingredients shown in the table 1, and be cast into continuously cast bloom or steel ingot.Continuously cast bloom or steel ingot are heated to 1200 ℃, are incubated 115 minutes, carry out roughing, it is 1150 ℃ that roughing begins temperature, rolls into the bar of φ 22 ± 0.5mm.Carry out finish rolling then, final rolling temperature is 980 ℃, rolls into the wire rod of φ 9 ± 0.3mm on continuous mill, rolls the back air cooling.
Embodiment 2
Embodiment is with embodiment 1.Wherein Heating temperature is 1220 ℃, is incubated 120 minutes; The roughing temperature is 1165 ℃; Final rolling temperature is 1000 ℃, rolls the back air cooling.
Embodiment 3
Embodiment is with embodiment 1.Wherein Heating temperature is 1250 ℃, is incubated 125 minutes; The roughing temperature is 1170 ℃; Final rolling temperature is 1010 ℃, rolls the back air cooling.
Embodiment 4
Embodiment is with embodiment 1.Wherein Heating temperature is 1235 ℃, is incubated 130 minutes; The roughing temperature is 1180 ℃; Final rolling temperature is 1018 ℃, rolls the back air cooling.
Embodiment 5
Embodiment is with embodiment 1.Wherein Heating temperature is 1215 ℃, is incubated 118 minutes; The roughing temperature is 1157 ℃; Final rolling temperature is 990 ℃, rolls the back air cooling.
Embodiment 6
Embodiment is with embodiment 1.Wherein Heating temperature is 1205 ℃, is incubated 110 minutes; The roughing temperature is 1175 ℃; Final rolling temperature is 1020 ℃ and rolls the back air cooling.
Comparative example 1
Press the smelting molten steel in the vacuum electromagnetic induction furnace of the chemical ingredients shown in the table 1, and be cast into continuously cast bloom or steel ingot, continuously cast bloom or steel ingot are heated to 1350 ℃, be incubated homogeneous microstructure processing in 110 minutes, carry out roughing again, it is 1150 ℃ that roughing begins temperature, roll into the bar of φ 22 ± 0.5mm, carry out finish rolling then, final rolling temperature is 980 ℃, rolls into the wire rod of φ 9mm ± 0.3 on continuous mill.
The 1600MPa level physical construction of table 1 comparative example 1 of the present invention and embodiment 1-6 is used
The chemical ingredients of hot rolling wire (wt%)
| C | Si | Mn | Mo | Fe and impurity | |
| Embodiment 1 | 0.20 | 2.5 | 2.0 | 0.20 | Surplus |
| Embodiment 2 | 0.25 | 2.0 | 2.5 | 0.25 | Surplus |
| Embodiment 3 | 0.30 | 3.0 | 3.0 | 0.30 | Surplus |
| Embodiment 4 | 0.22 | 1.6 | 3.2 | 0.21 | Surplus |
| Embodiment 5 | 0.28 | 2.8 | 2.2 | 0.28 | Surplus |
| Embodiment 6 | 0.24 | 2.2 | 3.9 | 0.23 | Surplus |
| Comparative example 1 | 0.10 | 1.5 | 1.5 | 0.15 | Surplus |
The test example
By standard GB/T228-2002 the 1600MPa level physical construction in embodiment of the invention 1-6 and the comparative example 1 is carried out Mechanics Performance Testing with hot rolling wire, table with test results 2.
The 1600MPa level physical construction of table 2 comparative example 1 of the present invention and embodiment 1-6 is used
The mechanical property of hot rolling wire
| Yield strength (MPa) | Tensile strength (MPa) | Yield tensile ratio | Relative reduction in area (%) | Unit elongation (%) | |
| Embodiment 1 | 1405 | 1697 | 0.82 | 53 | 10.7 |
| Embodiment 2 | 1572 | 1780 | 0.88 | 52 | 10.6 |
| Embodiment 3 | 1603 | 1801 | 0.89 | 51.4 | 10.2 |
| Embodiment 4 | 1417 | 1720 | 0.82 | 52.3 | 10.5 |
| Embodiment 5 | 1581 | 1742 | 0.90 | 51.8 | 10.3 |
| Embodiment 6 | 1589 | 1793 | 0.88 | 51.5 | 10.2 |
| Comparative example 1 | 1100 | 1420 | 0.77 | 53.5 | 12.0 |
Claims (4)
1. 1600MPa level physical construction hot rolling wire, it is characterized in that, described physical construction comprises with the chemical ingredients of hot rolling wire: C:0.20～0.30wt%, Si:1.5～3.0wt%, Mn:2.0～4.0wt%, Mo:0.20～0.30wt%, and surplus is Fe and unavoidable impurities;
Described physical construction is made up of needle type martensite and bainite with the microstructure of hot rolling wire, and wherein the bainite volumn concentration is 5～10%.
2. 1600MPa level physical construction hot rolling wire according to claim 1 is characterized in that, in described unavoidable impurities, and S≤0.020%, P≤0.025%, O, N, H total amount＜50mg/kg.
3. the described 1600MPa level of claim 1 physical construction is with the manufacture method of hot rolling wire, comprise smelting, casting, heating, roughing and finish rolling operation, it is characterized in that, in described roughing operation, roughing begins 1150～1180 ℃ of temperature ranges, rolls into the bar of φ 22 ± 0.5mm; In described finish rolling operation, the final rolling temperature scope is 980～1020 ℃, rolls into the wire rod of φ 9 ± 0.3mm, rolls the back air cooling.
4. manufacture method according to claim 3 is characterized in that, in described heating process, Heating temperature is 1200～1250 ℃, and soaking time is 110～130 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810037914XA CN101586207B (en) | 2008-05-23 | 2008-05-23 | Hot rolling wire rod for mechanical structure of 1600 Mpa level and manufacture method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810037914XA CN101586207B (en) | 2008-05-23 | 2008-05-23 | Hot rolling wire rod for mechanical structure of 1600 Mpa level and manufacture method thereof |
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| Publication Number | Publication Date |
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| CN101586207A CN101586207A (en) | 2009-11-25 |
| CN101586207B true CN101586207B (en) | 2011-07-13 |
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