CN102899470A - Method for controlling decarburization on surfaces of medium-carbon cold forging steel wires - Google Patents
Method for controlling decarburization on surfaces of medium-carbon cold forging steel wires Download PDFInfo
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- CN102899470A CN102899470A CN2012104351120A CN201210435112A CN102899470A CN 102899470 A CN102899470 A CN 102899470A CN 2012104351120 A CN2012104351120 A CN 2012104351120A CN 201210435112 A CN201210435112 A CN 201210435112A CN 102899470 A CN102899470 A CN 102899470A
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Abstract
The invention relates to a method for controlling decarburization on surfaces of medium-carbon cold forging steel wires. Cold forging steel comprises the following chemical ingredients in percentage by weight: 0.25 to 0.45 percent of C, 0.45 to 0.90 percent of Mn, 0.05 to 0.40 percent of Si, 0.70 to 1.50 percent of Cr, 0.03 to 0.50 percent of Mo, 0.015 to 0.045 percent of Alt and the balance of Fe and inevitable impurities. According to a process, the temperature of a first section of a heating furnace is 880 to 950 DEG C, the temperature of a second section is 980 to 1,050 DEG C, and the furnace temperature of a soaking section is 1,050 to 1,150 DEG C; the warmup time in the furnace is 90 to 130 minutes, and an air-fuel ratio of the soaking section is about 0.8:1; and the wire spraying temperature is 800 to 820 DEG C, and sprayed wires are cooled quickly at the cooling speed of 8 DEG C/second to the temperature of about 650 DEG C. By the method, fully-decarburized layers on the surfaces of the cold forging steel wires can be avoided, and the thicknesses of locally-decarburized layers are not more than 20 micrometers.
Description
Technical field
The invention belongs to the cold heading steel production technical field, specifically a kind of control method of medium carbon cold heading steel wire rod superficial decarbonization.
Background technology
Fastening piece is very important mechanical component, in national defence, industry, agricultural, science and technology and daily life, all is widely used.Fastening piece production level and capability and performance etc. are being played the part of very important role in the development of the industrial sectors such as automobile, machinery, space flight and aviation; And the cold heading steel starting material produced of fastening piece just.Automobile and machinery manufacturing industry are the main users of cold heading steel.In recent years, along with lightweight and the high performance of automobile, an urgent demand improves intensity and the performance of cold heading steel.According to the prediction of Domestic Automotive Industry association, based on the car load development is far away prior to fastening parts of automobiles during " 12 ", a few years from now on will be the high-speed development period of fastening parts of automobiles.Given this, recent years has been carried out a large amount of research work, further improves strength level and the work-ing life of cold heading steel.
The cold heading steel surface quality is very large on its use properties impact, and the top layer exists Decarburized structure can seriously reduce intensity and the work-ing life of cold heading steel, has a strong impact on simultaneously the cold heading steel lumber recovery.When existing the certain thickness Decarburized layer, the cold heading steel surface just can cause use properties to reduce.Therefore the control of decarburized layer deepness and pattern is a very important aspect of production high strength high-quality cold heading steel; Also can greatly enhance productivity simultaneously, reduce production costs.
Summary of the invention
Technical problem to be solved by this invention is, a kind of control method of medium carbon cold heading steel wire rod superficial decarbonization is provided, and can make the Cold Heading Steel Wire surface not produce Fully decarburized layer, and the partial decarburization layer thickness is no more than 20 μ m.
The technical scheme that the present invention solves above technical problem is:
A kind of control method of medium carbon cold heading steel wire rod superficial decarbonization specifically is controlled to be:
Medium carbon cold heading steel wire rod chemical composition 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, surplus is Fe and inevitable impurity;
Heating process: for reducing blank heating process mesexine oxidation and practical decarburized depth, guarantee that simultaneously blank heating is even, the temperature control of process furnace primary reformer is at 880～950 ℃, and the secondary reformer temperature control is at 980～1050 ℃, the soaking zone Control for Kiln Temperature is at 1050～1150 ℃, time inside furnace 90～130min; Process furnace soaking zone air-fuel ratio is controlled at 0.75～0.85, and preheating section and heating zone air-fuel ratio are controlled at 0.9～1.0;
Rolling technology: the steel billet rear de-scaling water pressure 18～20Mpa that comes out of the stove, the finishing mill temperature in is controlled at 860～880 ℃, subtracts the sizing temperature in and is controlled at 850～870 ℃, and the wire spinning temperature is controlled at 800～820 ℃;
Process for cooling: for preventing that superficial decarbonization occurs in the process of cooling, crystal grain thinning also reduces ferritic structure ratio in the product, and the cooling rate with 6～10 ℃/s after weaving silk is quickly cooled to 630～670 ℃, then enters the stay-warm case slow cooling.
The technical scheme that the present invention further limits is:
The control method of aforesaid medium carbon cold heading steel wire rod superficial decarbonization, medium carbon cold heading steel wire rod chemical composition 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%, surplus is Fe and inevitable impurity;
The process furnace heating process: the temperature control of process furnace primary reformer is at 890 ℃, the secondary reformer temperature control is at 1010 ℃, and the soaking zone Control for Kiln Temperature is at 1130 ℃, time inside furnace 95min, process furnace soaking zone air-fuel ratio is controlled at 0.80, and preheating section and heating zone air-fuel ratio are controlled at 0.90;
Rolling technology: the steel billet rear de-scaling water pressure 18Mpa that comes out of the stove, the finishing mill temperature in is controlled at 870 ℃, subtracts the sizing temperature in and is controlled at 855 ℃, and the wire spinning temperature is controlled at 815 ℃;
Process for cooling: the cooling rate with 9.5 ℃/s after weaving silk is quickly cooled to 640 ℃, then enters the stay-warm case slow cooling.
The control method of aforesaid medium carbon cold heading steel wire rod superficial decarbonization, medium carbon cold heading steel wire rod chemical composition 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%, surplus is Fe and inevitable impurity;
The process furnace heating process: the temperature control of process furnace primary reformer is at 895 ℃, the secondary reformer temperature control is at 1020 ℃, and the soaking zone Control for Kiln Temperature is at 1120 ℃, time inside furnace 98min, process furnace soaking zone air-fuel ratio is controlled at 0.78, and preheating section and heating zone air-fuel ratio are controlled at 0.92;
Rolling technology: the steel billet rear de-scaling water pressure 18Mpa that comes out of the stove, the finishing mill temperature in is controlled at 865 ℃, subtracts the sizing temperature in and is controlled at 853 ℃, and the wire spinning temperature is controlled at 810 ℃;
Process for cooling: the cooling rate with 9.8 ℃/s after weaving silk is quickly cooled to 635 ℃, then enters the stay-warm case slow cooling.
The control method of aforesaid medium carbon cold heading steel wire rod superficial decarbonization, medium carbon cold heading steel wire rod chemical composition is by weight percentage: C:0.34%, Mn:0.64%, Si:0.26%, Cr:0.97%, Mo:0.18%, P:0.019%, S:0.006%, Cu:0.08%, Ni:0.04%, Alt:0.029%, surplus is Fe and inevitable impurity;
The process furnace heating process: the temperature control of process furnace primary reformer is at 900 ℃, the secondary reformer temperature control is at 1050 ℃, and the soaking zone Control for Kiln Temperature is at 1135 ℃, time inside furnace 94min, process furnace soaking zone air-fuel ratio is controlled at 0.82, and preheating section and heating zone air-fuel ratio are controlled at 0.91;
Rolling technology: the steel billet rear de-scaling water pressure 19Mpa that comes out of the stove, the finishing mill temperature in is controlled at 863 ℃, subtracts the sizing temperature in and is controlled at 860 ℃, and the wire spinning temperature is controlled at 809 ℃;
Process for cooling: the cooling rate with 9.6 ℃/s after weaving silk is quickly cooled to 632 ℃, then enters the stay-warm case slow cooling.
The control method of aforesaid medium carbon cold heading steel wire rod superficial decarbonization, medium carbon cold heading steel wire rod casting blank cross-section size is 150mm * 150mm, product specification is Φ 6～23mm.
The invention has the beneficial effects as follows: by the technique that the present invention is led to, medium carbon cold heading steel steel wire rod top layer does not produce Fully decarburized layer, and the partial decarburization layer thickness is no more than 20 μ m; In addition, the present invention is by process furnace Heating temperature and cooling controlling and rolling controlling process are carried out process optimization, and is not high to equipment requirements, is convenient to implement steady quality.
Fig. 1 is that cold heading steel superficial decarbonization of the present invention is organized photo, and by photo as can be known, the Cold Heading Steel Wire top layer does not produce Fully decarburized layer, and the partial decarburization layer thickness is no more than 20 μ m.
Fig. 2 is the present invention's 1/4th places metallographic structure photo, and as shown in Figure 2, tissue contains a small amount of ferrite and pearlite take bainite as main.
Description of drawings
Fig. 1 is that cold heading steel superficial decarbonization of the present invention is organized photo.
Fig. 2 is cold heading steel 1/4th places metallographic structure photo of the present invention.
Embodiment
Embodiment 1
The present embodiment is a kind of control method of medium carbon cold heading steel wire rod superficial decarbonization, medium carbon cold heading steel wire rod chemical composition 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%, surplus is Fe and inevitable impurity.
The present embodiment medium carbon cold heading steel operational path is: electrosmelting → refining → continuous casting → strand 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 present embodiment is that cross dimensions is the continuously cast bloom of 150mm * 150mm, and rolling diameter is the Cold Heading Steel Wire of 8mm, and the control method of wire rod superficial decarbonization is specially:
Process furnace heating process: for alleviating the mesexine oxidation of blank heating process and practical decarburized depth, guarantee that simultaneously blank heating is even, the temperature control of process furnace primary reformer is at 890 ℃, and the secondary reformer temperature control is at 1010 ℃, the soaking zone Control for Kiln Temperature is at 1130 ℃, time inside furnace 95min; Process furnace soaking zone air-fuel ratio is controlled at 0.80, and preheating section and heating zone air-fuel ratio are controlled at 0.90;
Rolling technology: the steel billet rear de-scaling water pressure 18Mpa that comes out of the stove, the finishing mill temperature in is controlled at 870 ℃, subtracts the sizing temperature in and is controlled at 855 ℃, and the wire spinning temperature is controlled at 815 ℃;
Stelmor cooling technique: for preventing that superficial decarbonization occurs in the process of cooling, crystal grain thinning also reduces ferritic structure ratio in the product, and the cooling rate fast wind with 9.5 ℃/s behind the wire spinning is chilled to 640 ℃, then advances the stay-warm case slow cooling.
The present embodiment is formulated reasonably rolling and stelmor Controlled cooling process by the process furnace Heating temperature is controlled, and makes medium carbon cold heading steel steel wire rod top layer not produce Fully decarburized layer, and the partial decarburization layer thickness is no more than 20 μ m.
Embodiment 2
The present embodiment is a kind of control method of medium carbon cold heading steel wire rod superficial decarbonization, medium carbon cold heading steel wire rod chemical composition 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%, surplus is Fe and inevitable impurity.
The present embodiment medium carbon cold heading steel operational path is: electrosmelting → refining → continuous casting → strand 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 present embodiment is that cross dimensions is the continuously cast bloom of 150mm * 150mm, and rolling diameter is the Cold Heading Steel Wire of 13mm, and the control method of wire rod superficial decarbonization is specially:
Process furnace heating process: for alleviating the mesexine oxidation of blank heating process and practical decarburized depth, guarantee that simultaneously blank heating is even, the temperature control of process furnace primary reformer is at 895 ℃, and the secondary reformer temperature control is at 1020 ℃, the soaking zone Control for Kiln Temperature is at 1120 ℃, time inside furnace 98min; Process furnace soaking zone air-fuel ratio is controlled at 0.78, and preheating section and heating zone air-fuel ratio are controlled at 0.92;
Rolling technology: the steel billet rear de-scaling water pressure 18Mpa that comes out of the stove, the finishing mill temperature in is controlled at 865 ℃, subtracts the sizing temperature in and is controlled at 853 ℃, and the wire spinning temperature is controlled at 810 ℃;
Stelmor cooling technique: for preventing that superficial decarbonization occurs in the process of cooling, crystal grain thinning also reduces ferritic structure ratio in the product, and the cooling rate fast wind with 9.8 ℃/s behind the wire spinning is chilled to 635 ℃, then advances the stay-warm case slow cooling.
The present embodiment is formulated reasonably rolling and stelmor Controlled cooling process by the process furnace Heating temperature is controlled, and makes medium carbon cold heading steel steel wire rod top layer not produce Fully decarburized layer, and the partial decarburization layer thickness is no more than 20 μ m.
Embodiment 3
The present embodiment is a kind of control method of medium carbon cold heading steel wire rod superficial decarbonization, medium carbon cold heading steel wire rod chemical composition is by weight percentage: C:0.34%, Mn:0.64%, Si:0.26%, Cr:0.97%, Mo:0.18%, P:0.019%, S:0.006%, Cu:0.08%, Ni:0.04%, Alt:0.029%, surplus is Fe and inevitable impurity.
The present embodiment medium carbon cold heading steel operational path is: electrosmelting → refining → continuous casting → strand 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 present embodiment is that cross dimensions is the continuously cast bloom of 150mm * 150mm, and rolling diameter is the Cold Heading Steel Wire of 10mm, and the control method of wire rod superficial decarbonization is specially:
Process furnace heating process: for alleviating the mesexine oxidation of blank heating process and practical decarburized depth, guarantee that simultaneously blank heating is even, the temperature control of process furnace primary reformer is at 900 ℃, and the secondary reformer temperature control is at 1050 ℃, the soaking zone Control for Kiln Temperature is at 1135 ℃, time inside furnace 94min; Process furnace soaking zone air-fuel ratio is controlled at 0.82, and preheating section and heating zone air-fuel ratio are controlled at 0.91;
Rolling technology: the steel billet rear de-scaling water pressure 19Mpa that comes out of the stove, the finishing mill temperature in is controlled at 863 ℃, subtracts the sizing temperature in and is controlled at 860 ℃, and the wire spinning temperature is controlled at 809 ℃;
Stelmor cooling technique: for preventing that superficial decarbonization occurs in the process of cooling, crystal grain thinning also reduces ferritic structure ratio in the product, and the cooling rate fast wind with 9.6 ℃/s behind the wire spinning is chilled to 632 ℃, then advances the stay-warm case slow cooling.
The present embodiment is formulated reasonably rolling and stelmor Controlled cooling process by the process furnace Heating temperature is controlled, and makes medium carbon cold heading steel steel wire rod top layer not produce Fully decarburized layer, and the partial decarburization layer thickness is no more than 20 μ m.
In addition to the implementation, 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 (5)
1. the control method of a medium carbon cold heading steel wire rod superficial decarbonization is characterized in that:
Described medium carbon cold heading steel wire rod chemical composition 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, surplus is Fe and inevitable impurity;
The process furnace heating process: the temperature control of process furnace primary reformer is at 880～950 ℃, the secondary reformer temperature control is at 980～1050 ℃, the soaking zone Control for Kiln Temperature is at 1050～1150 ℃, time inside furnace 90～130min, process furnace soaking zone air-fuel ratio is controlled at 0.75～0.85, and preheating section and heating zone air-fuel ratio are controlled at 0.9～1.0;
Rolling technology: the steel billet rear de-scaling water pressure 18～20Mpa that comes out of the stove, the finishing mill temperature in is controlled at 860～880 ℃, subtracts the sizing temperature in and is controlled at 850～870 ℃, and the wire spinning temperature is controlled at 800～820 ℃;
Process for cooling: the cooling rate with 6～10 ℃/s after weaving silk is quickly cooled to 630～670 ℃, then enters the stay-warm case slow cooling.
2. the control method of medium carbon cold heading steel wire rod superficial decarbonization as claimed in claim 1, it is characterized in that: described medium carbon cold heading steel wire rod chemical composition 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%, surplus is Fe and inevitable impurity;
The process furnace heating process: the temperature control of process furnace primary reformer is at 890 ℃, the secondary reformer temperature control is at 1010 ℃, and the soaking zone Control for Kiln Temperature is at 1130 ℃, time inside furnace 95min, process furnace soaking zone air-fuel ratio is controlled at 0.80, and preheating section and heating zone air-fuel ratio are controlled at 0.90;
Rolling technology: the steel billet rear de-scaling water pressure 18Mpa that comes out of the stove, the finishing mill temperature in is controlled at 870 ℃, subtracts the sizing temperature in and is controlled at 855 ℃, and the wire spinning temperature is controlled at 815 ℃;
Process for cooling: the cooling rate with 9.5 ℃/s after weaving silk is quickly cooled to 640 ℃, then enters the stay-warm case slow cooling.
3. the control method of medium carbon cold heading steel wire rod superficial decarbonization as claimed in claim 1, it is characterized in that: described medium carbon cold heading steel wire rod chemical composition 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%, surplus is Fe and inevitable impurity;
The process furnace heating process: the temperature control of process furnace primary reformer is at 895 ℃, the secondary reformer temperature control is at 1020 ℃, and the soaking zone Control for Kiln Temperature is at 1120 ℃, time inside furnace 98min, process furnace soaking zone air-fuel ratio is controlled at 0.78, and preheating section and heating zone air-fuel ratio are controlled at 0.92;
Rolling technology: the steel billet rear de-scaling water pressure 18Mpa that comes out of the stove, the finishing mill temperature in is controlled at 865 ℃, subtracts the sizing temperature in and is controlled at 853 ℃, and the wire spinning temperature is controlled at 810 ℃;
Process for cooling: the cooling rate with 9.8 ℃/s after weaving silk is quickly cooled to 635 ℃, then enters the stay-warm case slow cooling.
4. the control method of medium carbon cold heading steel wire rod superficial decarbonization as claimed in claim 1, it is characterized in that: described medium carbon cold heading steel wire rod chemical composition is by weight percentage: C:0.34%, Mn:0.64%, Si:0.26%, Cr:0.97%, Mo:0.18%, P:0.019%, S:0.006%, Cu:0.08%, Ni:0.04%, Alt:0.029%, surplus is Fe and inevitable impurity;
The process furnace heating process: the temperature control of process furnace primary reformer is at 900 ℃, the secondary reformer temperature control is at 1050 ℃, and the soaking zone Control for Kiln Temperature is at 1135 ℃, time inside furnace 94min, process furnace soaking zone air-fuel ratio is controlled at 0.82, and preheating section and heating zone air-fuel ratio are controlled at 0.91;
Rolling technology: the steel billet rear de-scaling water pressure 19Mpa that comes out of the stove, the finishing mill temperature in is controlled at 863 ℃, subtracts the sizing temperature in and is controlled at 860 ℃, and the wire spinning temperature is controlled at 809 ℃;
Process for cooling: the cooling rate with 9.6 ℃/s after weaving silk is quickly cooled to 632 ℃, then enters the stay-warm case slow cooling.
5. such as the control method of the described medium carbon cold heading steel wire rod of any claim superficial decarbonization among the claim 1-4, it is characterized in that: described medium carbon cold heading steel wire rod casting blank cross-section size is 150mm * 150mm, and product specification is Φ 6～23mm.
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| CN104419818A (en) * | 2013-08-22 | 2015-03-18 | 南京钢铁股份有限公司 | Heating method for cold-heading steel wire |
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