CN102560253A - Manufacturing method of high-quality cold heading steel with uniform structure property - Google Patents
Manufacturing method of high-quality cold heading steel with uniform structure property Download PDFInfo
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Abstract
The invention belongs to the technical field of medium carbon cold heading steel wire production, and relates to a manufacturing method of high-quality cold heading steel with a uniform structure property. The cold heading steel comprises the following chemical compositions by weight percent: 0.25 to 0.45% of C, 0.45 to 0.9% of Mn, 0.05 to 0.40% of Si, 0.70 to 1.50% of Cr, 0.03 to 0.50% of Mo, 0.015 to 0.045% of Alt, and the balance being Fe and unavoidable impurities. In a rolling process, a casting blank is heated, the billet taping temperature is 900 to 1150 DEG C, the final finish rolling temperature is 700 to 860 DEG C, and the spinning temperature is 800 to 880 DEG C. In a Stelmor air-cooled wire controlled cooling process, the casting blank is cooled to 500 to 700 DEG C at a cooling rate of more than 5 DEG C/s and then enters a cover, and the cooling rate in the cover is 0.2 to 0.8 DEG C/s. According to the manufacturing method, the traditional controlled rolling and controlled cooling process is reasonably set, and the role of the controlled rolling and controlled cooling process in structure control is fully played, so that the ideal structure is controlled, the cracking problem of the cold heading steel is greatly solved, the pass rate of standard finished products is improved, and the economic efficiency is improved.
Description
Technical field
The invention belongs to medium carbon cold heading steel wire production technical field, the method for manufacture of the uniform high-quality cold heading steel of a kind of specifically structure property.
Background technology
According to Domestic Automotive Industry association prediction, far away prior to the automobile fastening piece, 5 years from now on will be the high-speed development period of automobile fastening piece based on the development of car load during " 12 ".Because advantages such as good, high purity of imported materials and items hardening capacity and assembling are stable, high level fastening piece market is occupied by external product for a long time.
In the steel enterprise, adding perlite with ferritic serve as in the wire production of mainly organizing at home, overlapped points and non-overlapping in process of cooling cooling rate inhomogeneous.Non-overlapping some place: obtain the thick ferritic structure of crystal grain, and tissue odds is even, can cause the reduction of cold heading performance.Overlapped points position: go out to cover the higher phase transformation of temperature and finish as yet, in follow-up collection volume air cooling, further phase transformation takes place finally produce bainite and add little ferrite and pearlitic structure.Wire rod tissue odds is even, and mechanical property also is not quite similar; This uses for downstream client's processing and has brought very big inconvenience, causes problems such as cold-heading processing cracking and working modulus are low.
Summary of the invention
Technical problem to be solved by this invention is; Overcome the shortcoming of prior art, the method for manufacture of the uniform high-quality cold heading steel of a kind of structure property is provided, through the controlled rolling and the technology for controlled cooling of reasonable setting cold heading steel wire rod; Make full use of the recrystallize of finish to gauge stage austenite crystal; The refinement original austenite grains is rationally set Stanermo wind-cooling linear technology simultaneously, and obtaining with the bainite is the main uniform original wire rod of structure property; In subsequent heat treatment, obtain uniform Spheroidizing Annealing tissue, effectively reduced the cracking problem of cold heading steel processing.
The technical scheme that the present invention solves above technical problem is:
The method of manufacture of the uniform high-quality cold heading steel of a kind of structure property, operational path is: electrosmelting → refining → continuous casting → steel billet ball blast, reconditioning → strand heating → de-scaling → roughing → in roll → finish rolling → weave silk → Stanermo wind-cooling linear → collection rolls up → ties up sign → check → warehouse-in;
The cold heading steel chemical ingredients is by weight percentage: C:0.25～0.45%, Mn:0.45～0.90%, Si:0.05～0.40%; Cr:0.70～1. 50%; Mo:0.03～0.50%, Alt:0.015～0.045% (representing full aluminium), all the other are Fe and unavoidable impurities;
Rolling technology: 900～1150 ℃ of strand heating back steel billet tapping temperatures, the finish rolling finishing temperature: 700～860 ℃, laying temperature: 800～880 ℃;
The Stanermo wind-cooling linear cooling control technology: go into cover with after 5 ℃/s～10 ℃/the s cooling rate is cooled to 500～700 ℃, cooling rate is 0.2～0.8 ℃/s in the cover, and going out to cover temperature is 460～630 ℃.
Like this, it is cold soon to go into the preceding elder generation of cover, avoids taking place ferritic and pearlitic transformation; Slow cooling is gone into to cover with lesser temps in fast cold back, and bainite transformation successively takes place for non-overlapping point and overlapped points, obtains the uniform wire rod of structure property.Middle (being non-overlapping point): in the fast cold stage, phase transition process is crossed ferritic and pearlite region basically; After going into cover with lesser temps, bainitic transformation takes place; Finally obtaining with the bainite is main add little ferrite, pearlitic tissue.Overlapped points:, a spot of ferritic, pearlitic transformation take place with than the cooling of slow cooling speed.Control out the cover temperature and be about to transition temperature to bainite, in follow-up collection volume air cooling, taking place that further phase transformation finally produces with the bainite is to lead to add little ferrite, pearlitic tissue.In the control cover after the first slow cooling the fast cold bainite that obtains be mainly to add little ferrite, pearlitic tissue, although there are the temperature difference in overlapped points and non-overlapping some place, logical circle is organized identical.The wire rod of this uniform formation, formerly Spheroidizing Annealing can well be used in the cold-heading complete processing after the drawing again.
The technical scheme that the present invention further limits is:
The method of manufacture of the uniform high-quality cold heading steel of aforesaid structure property, the cold heading steel chemical ingredients is by weight percentage: C:0.35%, Mn:0.63%; Si:0.22%, Cr:0.97%, Mo:0.16%; P:0.011%, S:0.002%, Cu:0.07%; Ni:0.05%, Alt:0.026%, all the other are Fe and unavoidable impurities;
Rolling technology: 1060 ℃ of strand heating back steel billet tapping temperatures, the finish rolling finishing temperature: 830 ℃, laying temperature: 825 ℃;
Stanermo wind-cooling linear cooling control technology: 6.5 ℃/s of the air-cooled cooling rate of steel billet overlapped points; 6.5 ℃/s of air-cooled cooling rate in the middle of the steel billet, the steel billet overlap joint is clicked and entered 680 ℃ of cover temperature, goes into to cover 650 ℃ of temperature in the middle of the steel billet; 0.34 ℃/s of cooling rate in the steel billet overlapped points cover; 0.82 ℃/s of cooling rate in the steel billet intermediate cap, the steel billet overlap joint is pointed out 610 ℃ of cover temperature, goes out to cover 480 ℃ of temperature in the middle of the steel billet;
Prepared cold heading steel mechanical property is: tensile strength: 950Mpa, and unit elongation: 17%, relative reduction in area: 51%, Vickers' hardness: 296Hv.
The method of manufacture of the uniform high-quality cold heading steel of aforesaid structure property, the cold heading steel chemical ingredients is by weight percentage: C:0.35%, Mn:0.65%; Si:0.25%, Cr:0.98%, Mo:0.17%; P:0.019%, S:0.006%, Cu:0.08%; Ni:0.04%, Alt:0.031%, all the other are Fe and unavoidable impurities;
Rolling technology: 1050 ℃ of strand heating back steel billet tapping temperatures, the finish rolling finishing temperature: 835 ℃, laying temperature: 820 ℃;
Stanermo wind-cooling linear cooling control technology: coil 6.7 ℃/s of the air-cooled cooling rate of overlapped points; 6.8 ℃/s of air-cooled cooling rate in the middle of coiling coils overlap joint and clicks and enters 685 ℃ of cover temperature, goes into to cover 650 ℃ of temperature in the middle of coiling; Coil 0.35 ℃/s of cooling rate in the overlapped points cover; Coil 0.81 ℃/s of cooling rate in the intermediate cap, coil overlap joint and point out 610 ℃ of cover temperature, go out to cover 485 ℃ of temperature in the middle of coiling;
Prepared cold heading steel mechanical property is: tensile strength: 955Mpa, and unit elongation: 16%, relative reduction in area: 49%, Vickers' hardness: 298Hv.
The method of manufacture of the uniform high-quality cold heading steel of aforesaid structure property, cold heading steel specification are Φ 5.5～26mm.
The invention has the beneficial effects as follows: the present invention rationally sets existing cooling controlling and rolling controlling process; Given full play to the effect of cooling controlling and rolling controlling process aspect organizational controls; Control out the ideal tissue; Significantly reduce cold heading steel cold heading cracking problem, improve the qualification rate of standardized component finished product, increase economic efficiency.
Description of drawings
Fig. 1 is the microstructure picture of the embodiment of the invention 1 wire rod overlapped points position.
Fig. 2 is the microstructure picture at the non-overlapping point of the embodiment of the invention 1 wire rod place.
Embodiment
Embodiment
The method of manufacture of the uniform high-quality cold heading steel of a kind of structure property; Take to control the steel billet composition and adopt different cooling controlling and rolling controlling process to come the uniform cold heading steel of production structure property according to different size, main production process route is: electrosmelting → refining → continuous casting → steel billet ball blast, reconditioning → strand heating → de-scaling → roughing → in roll → finish rolling → weave silk → Stanermo wind-cooling linear → collection rolls up → ties up sign → check → warehouse-in.Cold heading steel wire gage Φ 5.5～26mm.
It is the square billet of 150 * 150mm that embodiment 1 adopts the blank section, and trimmed size is Φ 8mm, and composition is as shown in table 1; The steel billet tapping temperature is 1060 ℃; Laying temperature is 825 ℃, and rolling technology and Stanermo wind-cooling linear cooling control technology are as shown in table 2, and mechanical property is as shown in table 3.
It is the square billet of 150 * 150mm that embodiment 2 adopts the blank section, and trimmed size is Φ 12mm, and composition is as shown in table 1; The steel billet tapping temperature is 1050 ℃; Laying temperature is 820 ℃, and rolling technology and Stanermo wind-cooling linear cooling control technology are as shown in table 2, and mechanical property is as shown in table 3.
Table 1 chemical ingredients (wt, %)
| Composition | C | Mn | Si | Cr | P | S | Cu | Ni | Mo | Alt |
| Embodiment 1 | 0.35 | 0.63 | 0.22 | 0.97 | 0.011 | 0.002 | 0.07 | 0.05 | 0.16 | 0.026 |
| Embodiment 2 | 0.35 | 0.65 | 0.25 | 0.98 | 0.019 | 0.006 | 0.08 | 0.04 | 0.17 | 0.031 |
In table the ingredients listed, all the other are Fe and micro impurity element in the table 1.
Table 2 cooling controlling and rolling controlling process
" centre " i.e. " non-overlapping point " in the table 2.
Table 3 mechanical property
| ? | Tensile strength MPa | Unit elongation % | Relative reduction in area % | Vickers' hardness Hv |
| Embodiment 1 | 950 | 17 | 51 | 296 |
| Embodiment 2 | 955 | 16 | 49 | 298 |
Fig. 1 is the microstructure picture of embodiment 1 wire rod overlapped points position, and Fig. 2 is the microstructure picture at the non-overlapping point of embodiment 1 wire rod place, by visible overlapped points of Fig. 1 and Fig. 2 and non-overlapping point organize identical, performance is even.
Except that the foregoing description, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (4)
1. the method for manufacture of the uniform high-quality cold heading steel of structure property, operational path is: electrosmelting → refining → continuous casting → steel billet ball blast, reconditioning → strand heating → de-scaling → roughing → in roll → finish rolling → weave silk → Stanermo wind-cooling linear → collection rolls up → ties up sign → check → warehouse-in; It is characterized in that:
Said cold heading steel chemical ingredients is by weight percentage: C:0.25～0.45%, and Mn:0.45～0.90%, Si:0.05～0.40%, Cr:0.70～1. 50%, Mo:0.03～0.50%, Alt:0.015～0.045%, all the other are Fe and unavoidable impurities;
Rolling technology: 900～1150 ℃ of strand heating back steel billet tapping temperatures, the finish rolling finishing temperature: 700～860 ℃, laying temperature: 800～880 ℃;
The Stanermo wind-cooling linear cooling control technology: go into cover with after 5 ℃/s～10 ℃/the s cooling rate is cooled to 500～700 ℃, cooling rate is 0.2～0.8 ℃/s in the cover, and going out to cover temperature is 460～630 ℃.
2. the method for manufacture of the uniform high-quality cold heading steel of structure property as claimed in claim 1 is characterized in that: said cold heading steel chemical ingredients is by weight percentage: C:0.35%, Mn:0.63%; Si:0.22%, Cr:0.97%, Mo:0.16%; P:0.011%, S:0.002%, Cu:0.07%; Ni:0.05%, Alt:0.026%, all the other are Fe and unavoidable impurities;
Rolling technology: 1060 ℃ of strand heating back steel billet tapping temperatures, the finish rolling finishing temperature: 830 ℃, laying temperature: 825 ℃;
Stanermo wind-cooling linear cooling control technology: coil 6.5 ℃/s of the air-cooled cooling rate of overlapped points; 6.5 ℃/s of air-cooled cooling rate in the middle of coiling coils overlap joint and clicks and enters 680 ℃ of cover temperature, goes into to cover 650 ℃ of temperature in the middle of coiling; Coil 0.34 ℃/s of cooling rate in the overlapped points cover; Coil 0.82 ℃/s of cooling rate in the intermediate cap, coil overlap joint and point out 610 ℃ of cover temperature, go out to cover 480 ℃ of temperature in the middle of coiling;
Prepared cold heading steel mechanical property is: tensile strength: 950Mpa, and unit elongation: 17%, relative reduction in area: 51%, Vickers' hardness: 296Hv.
3. the method for manufacture of the uniform high-quality cold heading steel of structure property as claimed in claim 1 is characterized in that: said cold heading steel chemical ingredients is by weight percentage: C:0.35%, Mn:0.65%; Si:0.25%, Cr:0.98%, Mo:0.17%; P:0.019%, S:0.006%, Cu:0.08%; Ni:0.04%, Alt:0.031 %, all the other are Fe and unavoidable impurities;
Rolling technology: 1050 ℃ of strand heating back steel billet tapping temperatures, the finish rolling finishing temperature: 835 ℃, laying temperature: 820 ℃;
Stanermo wind-cooling linear cooling control technology: coil 6.7 ℃/s of the air-cooled cooling rate of overlapped points; 6.8 ℃/s of air-cooled cooling rate in the middle of coiling coils overlap joint and clicks and enters 685 ℃ of cover temperature, goes into to cover 650 ℃ of temperature in the middle of coiling; Coil 0.35 ℃/s of cooling rate in the overlapped points cover; Coil 0.81 ℃/s of cooling rate in the intermediate cap, coil overlap joint and point out 610 ℃ of cover temperature, go out to cover 485 ℃ of temperature in the middle of coiling;
Prepared cold heading steel mechanical property is: tensile strength: 955Mpa, and unit elongation: 16%, relative reduction in area: 49%, Vickers' hardness: 298Hv.
4. like the method for manufacture of claim 1 or the uniform high-quality cold heading steel of 2 or 3 described structure properties, it is characterized in that: said cold heading steel specification is Φ 5.5～26mm.
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