CN104988409A - Non-annealed cold forging steel hot-rolled wire rod and production method thereof - Google Patents
Non-annealed cold forging steel hot-rolled wire rod and production method thereof Download PDFInfo
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- CN104988409A CN104988409A CN201510462428.2A CN201510462428A CN104988409A CN 104988409 A CN104988409 A CN 104988409A CN 201510462428 A CN201510462428 A CN 201510462428A CN 104988409 A CN104988409 A CN 104988409A
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Abstract
The invention discloses a non-annealed cold forging steel hot-rolled wire rod and a production method thereof. The method comprises the steps of continuous casting, heating, rolling, spinning and cooling. The non-annealed cold forging steel hot-rolled wire rod comprises 0.29-0.38wt% of C, 0.15-0.30wt% of Si, 0.70-0.90wt% of Mn, 0.03wt% or less of P, 0.03wt% or less of S, 0.30wt% or less of Cr, 0.0008-0.0050wt% of B, and the balance of Fe and residual elements. In the heating step, continuous cast billets are heated to 1100-1190DEG C; in the rolling step, the initial finish rolling temperature is 965-995DEG C; in the spinning step, the spinning temperature is 960-990DEG C; and in the cooling step, the cooling speed is 0.5-1.5DEG C/s. The method realizes production of the non-annealed cold forging steel hot-rolled wire rod through optimally designing chemical components, controlling the heating temperature, the initial finish rolling temperature, the spinning temperature and the cooling speed and controlling the amount and the grain size of ferrite by using present devices and technologies without increasing investment or production cost, so the non-annealing production and cost reduction demands of downstream users are met, and pollution of annealing to environment is avoided.
Description
Technical field
The present invention relates to a kind of gren rod and production method thereof, especially one exempts from annealed cold-forging steel gren rod and production method thereof.
Background technology
At present, rapidly, within 2014, fastening piece ultimate production reaches 790.98 ten thousand tons, and middle high strength bolt ratio increases year by year in Chinese Investment in fastener industry development.When high strength bolt prepared by general medium carbon steel wire rod, needs annealing or Drawing-anneal, so not only consume mass energy, cause metal loss and contaminate environment, also can cause wire surface decarburization, affect the quality stability of bolt.According to measuring and calculating, steel annealing expense per ton is about 200 yuan.Therefore at the hard time of current steel industry, be improve the market competitiveness, meet the requirement that user reduces costs, what exploitation was energy-saving and cost-reducing, environmentally friendly exempt from, and annealed cold-forging steel is particularly important.
Have some producer's many employings thermal mechanical rollings (being again low temperature finish to gauge technology) to produce at present both at home and abroad and exempt from annealing or simple and easy anneal-free coil rod, but investment is large, high to equipment requirements.
Publication number CN102513725A discloses one and exempts from annealing welding wire steel wire rod and production technique thereof, comprises optimizing components and adjustment rolling technology; But it is many that this technique adds alloying element on the one hand, and add production cost, this technique is mainly for low-carbon welding wire steel on the other hand.
Publication number 102899554A discloses one and exempts from annealed low carbon steel wire rod and production method thereof, comprise convertor deacidification control, refining carburetting control, laying temperature control, roller table speed control, but the method is mainly for low-carbon cold heading steel.
Publication number CN102417959A discloses a kind of production method exempting from anneal hot rolling S50C strip, comprise that roughing temperature controls, final rolling temperature controls, laying temperature controls and speed of cooling controls exempts from production method of annealing, but the method is mainly for strip.
Patent No. CN1799717A discloses a kind of production method of 8.8 grade high-strength cold forging steel hot-rolling anneal-free coil rods, comprises and utilizes the high-speed rod-rolling mill with thermo-mechanical rolling function to produce the boracic anneal-free coil rod of exempting to anneal; But the method needs to carry out online upgrading to high line production line, increases the facility investments such as super-heavy load finishing train.
Therefore, how on not adding users cost basis, iron and steel enterprise is produced by technological innovation and exempts from annealing product, solves user's environmental protection and Cost Problems, is the following inevitable development trend improving Competitive Products and share of market.
Summary of the invention
What the technical problem to be solved in the present invention was to provide a kind of low cost exempts from annealed cold-forging steel gren rod; Present invention also offers a kind of production method exempting from annealed cold-forging steel gren rod.
For solving the problems of the technologies described above, present component is by weight percentage: C 0.29 ~ 0.38%, Si 0.15 ~ 0.30%, Mn 0.70 ~ 0.90%, P≤0.03%, S≤0.03%, Cr≤0.30%, B 0.0008 ~ 0.0050%, and all the other are iron and residual element.
The inventive method comprises continuous casting, heating, rolling, weaves silk and refrigerating work procedure, and its composition is described above;
In described heating process, continuously cast bloom is heated to 1100 ~ 1190 DEG C; In described rolling process, enter final rolling temperature 965 ~ 995 DEG C; Describedly weave silk in operation, laying temperature is 960 ~ 990 DEG C; In described refrigerating work procedure, speed of cooling is 0.5 ~ 1.5 DEG C/s.
In heating process described in the inventive method, soaking time is 100 ~ 150min.
Continuous casting working procedure described in the inventive method: cogging behind bloom slow cooling >=72 hour, continuously cast bloom carries out slow cooling in >=72 hours.
The principle that the inventive method adopts is: the optimization design of carrying out chemical composition, reduces the elements such as P, S, Si, reduces the work hardening of wire rod in drawing process, reduces the loss to mould; Under the prerequisite ensureing hardening capacity, reduce C, Mn, Cr element as far as possible, realize the reduction of intensity and the improvement of plasticity; Suitably improve into final rolling temperature, control austenite grain size, extend austenite to ferritic fringe time, promote ferrite forming core and grow up, improving ferritic grain-size simultaneously; Reduce rate of cooling, promote the full and uniform transformation of tissue, avoid tensile strength non-uniform phenomenon to occur.
The beneficial effect adopting technique scheme to produce is: present invention accomplishes downstream user and wish to remove carbide annealing process from, reduces the demand of manufacturing cost; Under the prerequisite meeting product basic technical indicator, can cold-heading be directly fastening piece after acid washing phosphorization drawing; Reach the object for user's economization annealing operation, cost efficiency.
The inventive method makes full use of existing installation and processing condition, do not increasing under investment and production cost prerequisite, designed by optimization of Chemical Composition, control Heating temperature, enter final rolling temperature, laying temperature and speed of cooling, control ferrite content and ferrite grain size, realize the production of exempting from annealed cold-forging steel gren rod.The inventive method had both met downstream user and had exempted from the demand of producing, reducing the cost of annealing, and turn avoid the pollution of annealing to environment, had the feature of energy-conserving and environment-protective, low cost.
The inventive method product has the ferrite and pearlite tissue of suitable drawing, good mechanical properties, and tensile strength controls at below 600MPa, and produce controlled, energy consumption is low, it is high to save facility investment, production efficiency, can significantly reduce user's production cost.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is the metallographic structure photo of embodiment 1 gren rod;
Fig. 2 is the metallographic structure photo of embodiment 2 gren rod.
Embodiment
Embodiment 1: the production method originally exempting from annealed cold-forging steel gren rod adopts following concrete technology.
(1) smelt, continuous casting working procedure: smelting molten steel continuous casting becomes continuously cast bloom, continuously cast bloom composition is by weight percentage: C 0.31%, Si 0.20%, Mn 0.70%, P 0.016%, S 0.008%, Cr 0.04%, B 0.0019%, and all the other are iron and residual element.In casting process, bloom slow cooling cogging after 72 hours of big cross section, then after hot rolling, obtain light-gauge continuously cast bloom, continuously cast bloom slow cooling 72 hours laggard heating processes.
(2) heating process: continuously cast bloom is heated to 1150 DEG C, soaking time 120min; Then dephosphorize by high pressure water, dephosphorization hydraulic pressure at least 10MPa.
(3) rolling, operation of weaving silk: the continuously cast bloom after dephosphorization is carried out 6+8 passage thick in roll, the pre-finish rolling of 4 passage, 4 passage finish rolling, enter final rolling temperature 970 DEG C; Finish rolling is weaved silk after terminating, and laying temperature controls at 965 DEG C.
(4) refrigerating work procedure: enter cooling line, blower fan and stay-warm case are all closed, and reduce roller table speed, speed of cooling is 1.0 DEG C/s, extend the residence time of wire rod in stay-warm case as far as possible; The size hot-rolled wire rod of Φ 13mm can be obtained after cooling.
It is 566Mpa that the present embodiment gained gren rod records tensile strength under WAW-200 hydraulic servo universal testing machine, is less than 600MPa, hardness 84.4HRB, reduction of area 59%, extends 14%, reaches and exempt from annealing product requirement.Fig. 1 is shown in the metallographic structure of the present embodiment gained gren rod, and wire rod tissue is made up of uniform ferrite and pearlite as seen from Figure 1, and tissue is based on ferrite, and ratio reaches 76%.
Embodiment 2: the production method originally exempting from annealed cold-forging steel gren rod adopts following concrete technology.
(1) smelt, continuous casting working procedure: smelting molten steel continuous casting becomes continuously cast bloom, continuously cast bloom composition is by weight percentage: C 0.32%, Si 0.18%, Mn 0.72%, P 0.016%, S 0.005%, Cr 0.03%, B 0.0021%, and all the other are iron and residual element.In casting process, bloom slow cooling cogging after 72 hours of big cross section, then after hot rolling, obtain light-gauge continuously cast bloom, continuously cast bloom slow cooling 72 hours laggard heating processes.
(2) heating process: continuously cast bloom is heated to 1190 DEG C, soaking time 110min; Then dephosphorize by high pressure water, dephosphorization hydraulic pressure at least 10MPa.
(3) rolling, operation of weaving silk: the continuously cast bloom after dephosphorization is carried out 6+8 passage thick in roll, the pre-finish rolling of 4 passage, 4 passage finish rolling, enter final rolling temperature 980 DEG C; Finish rolling is weaved silk after terminating, and laying temperature controls at 970 DEG C.
(4) refrigerating work procedure: enter cooling line, blower fan and stay-warm case are all closed, and speed of cooling is 0.8 DEG C/s, extend the residence time of wire rod in stay-warm case as far as possible; The size hot-rolled wire rod of Φ 13mm can be obtained after cooling.
It is 570Mpa that the present embodiment gained gren rod records tensile strength under WAW-200 hydraulic servo universal testing machine, is less than 600MPa, hardness 84.9HRB, reduction of area 58%, extends 12%, reaches and exempt from annealing product requirement.Fig. 2 is shown in the metallographic structure of the present embodiment gained gren rod, and wire rod tissue is made up of uniform ferrite and pearlite as seen from Figure 2, and tissue is based on ferrite, and ratio reaches 71%.
Embodiment 3: the production method originally exempting from annealed cold-forging steel gren rod adopts following concrete technology.
(1) smelt, continuous casting working procedure: smelting molten steel continuous casting becomes continuously cast bloom, continuously cast bloom composition is by weight percentage: C 0.29%, Si 0.15%, Mn 0.72%, P 0.012%, S 0.007%, Cr 0.04%, B 0.0025%, all the other are iron and residual element.In casting process, bloom slow cooling cogging after 72 hours of big cross section, then after hot rolling, obtain light-gauge continuously cast bloom, continuously cast bloom slow cooling 72 hours laggard heating processes.
(2) heating process: continuously cast bloom is heated to 1170 DEG C, soaking time 135min; Then dephosphorize by high pressure water, dephosphorization hydraulic pressure at least 10MPa.
(3) rolling, operation of weaving silk: the continuously cast bloom after dephosphorization is carried out 6+8 passage thick in roll, the pre-finish rolling of 4 passage, 4 passage finish rolling, enter final rolling temperature 980 DEG C; Finish rolling is weaved silk after terminating, and laying temperature controls at 975 DEG C.
(4) refrigerating work procedure: enter cooling line, blower fan and stay-warm case are all closed, and speed of cooling is 1.5 DEG C/s, extend the residence time of wire rod in stay-warm case as far as possible; The size hot-rolled wire rod of Φ 13mm can be obtained after cooling.
It is 560Mpa that the present embodiment gained gren rod records tensile strength under WAW-200 hydraulic servo universal testing machine, is less than 600MPa, hardness 84.1HRB, reduction of area 59%, extends 14%.Used by user, reach and exempt from annealing product requirement.
Embodiment 4: the production method originally exempting from annealed cold-forging steel gren rod adopts following concrete technology.
(1) smelt, continuous casting working procedure: smelting molten steel continuous casting becomes continuously cast bloom, continuously cast bloom composition is by weight percentage: C 0.38%, Si 0.22%, Mn 0.90%, P 0.025%, S 0.03%, Cr 0.16%, B 0.0008%, all the other are iron and residual element.In casting process, bloom slow cooling cogging after 90 hours of big cross section, then after hot rolling, obtain light-gauge continuously cast bloom, continuously cast bloom slow cooling 85 hours laggard heating processes.
(2) heating process: continuously cast bloom is heated to 1100 DEG C, soaking time 150min; Then dephosphorize by high pressure water, dephosphorization hydraulic pressure at least 10MPa.
(3) rolling, operation of weaving silk: the continuously cast bloom after dephosphorization is carried out 6+8 passage thick in roll, the pre-finish rolling of 4 passage, 4 passage finish rolling, enter final rolling temperature 965 DEG C; Finish rolling is weaved silk after terminating, and laying temperature controls at 960 DEG C.
(4) refrigerating work procedure: enter cooling line, blower fan and stay-warm case are all closed, and speed of cooling is 1.2 DEG C/s, extend the residence time of wire rod in stay-warm case as far as possible; The size hot-rolled wire rod of Φ 13mm can be obtained after cooling.
It is 588Mpa that the present embodiment gained gren rod records tensile strength under WAW-200 hydraulic servo universal testing machine, is less than 600MPa, hardness 85.1HRB, reduction of area 57%, extends 11%.Used by user, reach and exempt from annealing product requirement.
Embodiment 5: the production method originally exempting from annealed cold-forging steel gren rod adopts following concrete technology.
(1) smelt, continuous casting working procedure: smelting molten steel continuous casting becomes continuously cast bloom, continuously cast bloom composition is by weight percentage: C 0.35%, Si 0.30%, Mn 0.81%, P 0.03%, S 0.018%, Cr 0.30%, B 0.0050%, all the other are iron and residual element.In casting process, bloom slow cooling cogging after 75 hours of big cross section, then after hot rolling, obtain light-gauge continuously cast bloom, continuously cast bloom slow cooling 80 hours laggard heating processes.
(2) heating process: continuously cast bloom is heated to 1130 DEG C, soaking time 100min; Then dephosphorize by high pressure water, dephosphorization hydraulic pressure at least 10MPa.
(3) rolling, operation of weaving silk: the continuously cast bloom after dephosphorization is carried out 6+8 passage thick in roll, the pre-finish rolling of 4 passage, 4 passage finish rolling, enter final rolling temperature 995 DEG C; Finish rolling is weaved silk after terminating, and laying temperature controls at 990 DEG C.
(4) refrigerating work procedure: enter cooling line, blower fan and stay-warm case are all closed, and speed of cooling is 0.5 DEG C/s, extend the residence time of wire rod in stay-warm case as far as possible; The size hot-rolled wire rod of Φ 13mm can be obtained after cooling.
It is 579Mpa that the present embodiment gained gren rod records tensile strength under WAW-200 hydraulic servo universal testing machine, is less than 600MPa, hardness 84.6HRB, reduction of area 58%, extends 12%.Used by user, reach and exempt from annealing product requirement.
Claims (4)
1. exempt from annealed cold-forging steel gren rod for one kind, it is characterized in that, its composition is by weight percentage: C 0.29 ~ 0.38%, Si 0.15 ~ 0.30%, Mn 0.70 ~ 0.90%, P≤0.03%, S≤0.03%, Cr≤0.30%, B 0.0008 ~ 0.0050%, and all the other are iron and residual element.
2. exempt from the production method of annealed cold-forging steel gren rod for one kind, it comprises continuous casting, heating, rolling, weaves silk and refrigerating work procedure, it is characterized in that, its composition is by weight percentage: C 0.29 ~ 0.38%, Si 0.15 ~ 0.30%, Mn 0.70 ~ 0.90%, P≤0.03%, S≤0.03%, Cr≤0.30%, B 0.0008 ~ 0.0050%, and all the other are iron and residual element;
In described heating process, continuously cast bloom is heated to 1100 ~ 1190 DEG C; In described rolling process, enter final rolling temperature 965 ~ 995 DEG C; Describedly weave silk in operation, laying temperature is 960 ~ 990 DEG C; In described refrigerating work procedure, speed of cooling is 0.5 ~ 1.5 DEG C/s.
3. the production method exempting from annealed cold-forging steel gren rod according to claim 2, is characterized in that: in described heating process, soaking time is 100 ~ 150min.
4. the production method exempting from annealed cold-forging steel gren rod according to Claims 2 or 3, is characterized in that, described continuous casting working procedure: cogging behind bloom slow cooling >=72 hour, continuously cast bloom carries out slow cooling in >=72 hours.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106636893A (en) * | 2016-11-25 | 2017-05-10 | 邢台钢铁有限责任公司 | Stainless steel wire rod easy to cut and manufacturing method thereof |
| CN109136757A (en) * | 2018-09-05 | 2019-01-04 | 包头钢铁（集团）有限责任公司 | The production method of medium carbon cold heading steel wire rod and medium carbon cold heading steel wire rod |
| CN109234508A (en) * | 2018-10-10 | 2019-01-18 | 邢台钢铁有限责任公司 | A kind of medium carbon steel wire rod and its production method with high intensity and high-ductility |
| CN109290367A (en) * | 2018-09-25 | 2019-02-01 | 湖南华菱湘潭钢铁有限公司 | A kind of milling method of corrosion-resistant cold-forging steel |
| CN110616361A (en) * | 2019-11-06 | 2019-12-27 | 湖南华菱湘潭钢铁有限公司 | Production method of steel for annealing-free nitriding |
| WO2020078056A1 (en) * | 2018-10-19 | 2020-04-23 | 东北大学 | Preparation method for heavy-weight coil endless high-strength aluminum alloy wire rods for fastener blanks |
| CN111349856A (en) * | 2020-03-26 | 2020-06-30 | 邢台钢铁有限责任公司 | Cold heading steel wire rod for ultrahigh-strength lock rivet and preparation method thereof |
| CN114752847A (en) * | 2021-01-11 | 2022-07-15 | 宝山钢铁股份有限公司 | Annealing-free high-strength cold heading steel and manufacturing method thereof |
| CN114875332A (en) * | 2022-05-30 | 2022-08-09 | 湖南华菱湘潭钢铁有限公司 | Production method of annealing-free wire rod for high-strength alloy welding wire of 80 kilograms or more |
| CN116334469A (en) * | 2023-03-30 | 2023-06-27 | 新余钢铁股份有限公司 | ML40Cr spheroidizing-free annealed hot rolled wire rod and preparation method thereof |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106636893A (en) * | 2016-11-25 | 2017-05-10 | 邢台钢铁有限责任公司 | Stainless steel wire rod easy to cut and manufacturing method thereof |
| CN109136757B (en) * | 2018-09-05 | 2020-10-27 | 包头钢铁（集团）有限责任公司 | Production method of medium-carbon cold heading steel wire and medium-carbon cold heading steel wire |
| CN109136757A (en) * | 2018-09-05 | 2019-01-04 | 包头钢铁（集团）有限责任公司 | The production method of medium carbon cold heading steel wire rod and medium carbon cold heading steel wire rod |
| CN109290367A (en) * | 2018-09-25 | 2019-02-01 | 湖南华菱湘潭钢铁有限公司 | A kind of milling method of corrosion-resistant cold-forging steel |
| CN109234508A (en) * | 2018-10-10 | 2019-01-18 | 邢台钢铁有限责任公司 | A kind of medium carbon steel wire rod and its production method with high intensity and high-ductility |
| CN109234508B (en) * | 2018-10-10 | 2020-07-24 | 邢台钢铁有限责任公司 | Medium-carbon steel wire rod with high strength and high plasticity and production method thereof |
| WO2020078056A1 (en) * | 2018-10-19 | 2020-04-23 | 东北大学 | Preparation method for heavy-weight coil endless high-strength aluminum alloy wire rods for fastener blanks |
| CN110616361A (en) * | 2019-11-06 | 2019-12-27 | 湖南华菱湘潭钢铁有限公司 | Production method of steel for annealing-free nitriding |
| CN111349856A (en) * | 2020-03-26 | 2020-06-30 | 邢台钢铁有限责任公司 | Cold heading steel wire rod for ultrahigh-strength lock rivet and preparation method thereof |
| CN111349856B (en) * | 2020-03-26 | 2021-09-03 | 邢台钢铁有限责任公司 | Cold heading steel wire rod for ultrahigh-strength lock rivet and preparation method thereof |
| CN114752847A (en) * | 2021-01-11 | 2022-07-15 | 宝山钢铁股份有限公司 | Annealing-free high-strength cold heading steel and manufacturing method thereof |
| CN114875332A (en) * | 2022-05-30 | 2022-08-09 | 湖南华菱湘潭钢铁有限公司 | Production method of annealing-free wire rod for high-strength alloy welding wire of 80 kilograms or more |
| CN116334469A (en) * | 2023-03-30 | 2023-06-27 | 新余钢铁股份有限公司 | ML40Cr spheroidizing-free annealed hot rolled wire rod and preparation method thereof |
| CN116334469B (en) * | 2023-03-30 | 2024-01-23 | 新余钢铁股份有限公司 | ML40Cr spheroidizing-free annealed hot rolled wire rod and preparation method thereof |
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