CN103643167B - A kind of working method of 700MPa level Green heat treatment high strength cast iron - Google Patents
A kind of working method of 700MPa level Green heat treatment high strength cast iron Download PDFInfo
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- CN103643167B CN103643167B CN201310584550.8A CN201310584550A CN103643167B CN 103643167 B CN103643167 B CN 103643167B CN 201310584550 A CN201310584550 A CN 201310584550A CN 103643167 B CN103643167 B CN 103643167B
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Abstract
The invention discloses a kind of 700MPa level Green heat treatment high strength cast iron and working method thereof, its weight percent chemical composition is: C:0.18 ﹣ 0.3%, Si:0.6 ﹣ 0.9%, Mn:1.3 ﹣ 1.9%; Cr:0.05 ﹣ 0.1%, Nb:0.01 ﹣ 0.05%, V:0.10 ﹣ 0.20%, Ni:0.01 ﹣ 0.03%, B:0.002 ﹣ 0.004%, P<0.023%, S<0.023%, surplus is Fe.High strength cast iron yield strength of the present invention reaches 700MPa, have obvious yield point elongation and yield point elongation does not extend in time and disappears, anti-delayed fracture resistance is strong, plasticity is high and the simple easy handling of its working method operation, pollutes few, save electric energy and steel resources, production cost is low.
Description
Technical field
The present invention relates to a kind of working method of High Strength Steel Bar, be specifically related to a kind of working method of 700MPa level Green heat treatment high strength cast iron.
Background technology
At present, due to house property cause, the development of machinery cause etc., the demand of iron and steel improves greatly, also more and more higher to the requirement of iron and steel, the yield strength of existing hot-rolled reinforced bar is all lower, hot-rolled reinforced bar yield strength is allowed to reach 630Mpa and above so high intensity is very difficult thing, and intensity reaches so high, be difficult to guarantee and occur yield point elongation, just propose in country's Iron And Steel Industry " 12 " planning " accelerating to eliminate 335 MPa level Twisted Steels ", " strengthen the research of High Strength Steel Bar and High Strength Concrete Structures component anti-seismic performance, carry out 600 MPa levels and above Twisted Steel research and development of products ", the HRB600 level Deformed Steel Bars of a lot of large steel mill trial production now reaches mainly through adding " V " or " VN " alloy the object improving intensity, addition reaches about 0.15%, as everyone knows, add cost of alloy and will improve 300-400 unit, and during this kind reinforcing bar of large-scale production, owing to changing by alloy ingredient, production rate, the restriction of the factors such as smelting and rolling technology, the quality product produced is also unstable, often occur that intensity is low, the underproof phenomenon of strong flexor ratio, particularly the product of below 14mm specification is more serious.Patent of invention (application number: steel 201110086374.6) are produced through proportioning components, heating, cooling, quenching, tempering process, this process choice steel ingredient change and through twice temperature-rise period, improve smelting cost and power consumption cost to a certain extent, but its plasticity is low and strong flexor ratio is less, easy generation is ruptured instantaneously, cause the accidents such as overall fracture, in addition, there is the shortcomings such as Heavy environmental pollution, waste electric energy and steel resources, production cost are higher in existing thermal treatment high strength cast iron working method.A kind of working method reaching 700MPa and the above high strength cast iron overcoming above defect becomes those skilled in the art's technical problem urgently to be resolved hurrily.
Summary of the invention
Technical problem to be solved by this invention is, for the shortcoming that above prior art exists, a kind of working method of 700MPa level Green heat treatment high strength cast iron is proposed, high strength cast iron yield strength reaches 700MPa, there is obvious yield point elongation and yield point elongation does not extend in time and disappears, anti-delayed fracture resistance is strong, plasticity is high and processing and manufacturing is polluted less, cost is low.
The technical scheme that the present invention solves above technical problem is:
A kind of 700MPa level Green heat treatment high strength cast iron, its weight percent chemical composition is: C:0.18 ﹣ 0.3%, Si:0.6 ﹣ 0.9%, Mn:1.3 ﹣ 1.9%; Cr:0.05 ﹣ 0.1%, Nb:0.01 ﹣ 0.05%, V:0.10 ﹣ 0.20%, Ni:0.01 ﹣ 0.03%, B:0.002 ﹣ 0.004%, P<0.023%, S<0.023%, surplus is Fe.
The working method of 700MPa level Green heat treatment high strength cast iron, carry out according to the following steps:
(1) using the Chemical Composition containing aforementioned proportion as raw material, steel billet is obtained after converter smelting, refining treatment, continuous casting, steel billet enters stove preheating section temperature and controls below 700 DEG C, and Heating temperature is 950 ~ 1200 DEG C, heating 1 ~ 3h, roughing temperature is 945 ~ 1220 DEG C, roughing completes temperature and controls more than 950 DEG C, and finishing temperature is 870 ~ 895 DEG C, hot rolling of steel billet is become the threaded reinforcing bar of surface band, weakly after hot rolling be chilled to 830 ~ 940 DEG C, then naturally cool to room temperature;
(2) reinforcing bar good for rolling in step one is sent into process furnace and be heated to 840-920 DEG C, then the first refrigerating work procedure cool to room temperature;
First refrigerating work procedure is specially: adopt water-cooled to be combined with air cooling, first adopt water-cooled with the rate of cooling of 3.8-4.3 DEG C/s by reinforcing bar water-cooled to 390-420 DEG C, then air cooling is to 200-310 DEG C, adopt again water-cooled with the rate of cooling of 2.7-3.5 DEG C/s by reinforcing bar water-cooled to 175-190 DEG C, last air cooling is to room temperature;
(3) reinforcing bar cooled in step 2 is heated to 550-610 DEG C through tempering induction heater, after being then incubated 6-9 second, by the second refrigerating work procedure cool to room temperature;
Second refrigerating work procedure is specially: on cooling bed, carry out air cooling to reinforcing bar, first with the speed of cooling of 3-7 per second DEG C, reinforcing bar is cooled to 490-560 DEG C, and then progressively cools to room temperature;
(4) reinforcing bar cooled in step 3 is heated to 390-420 DEG C of insulation more than 50 minutes, carries out grain stabilized process;
(5) reinforcing bar of stabilized process is carried out loading cooling.
The technical scheme that the present invention limits further is:
Aforesaid 700MPa level Green heat treatment high strength cast iron, its weight percent chemical composition is: C:0.24%, Si:0.6%, Mn:1.6%, Cr:0.08%, Nb:0.02%, V:0.10%, Ni:0.03%, B:0.002%, P:0.020%, S:0.015%, surplus is Fe.
Aforesaid 700MPa level Green heat treatment high strength cast iron, its weight percent chemical composition is: C:0.18%, Si:0.8%, Mn:1.3%, Cr:0.1%, Nb:0.03%, V:0.15%, Ni:0.02%, B:0.004%, P:0.018%, S:0.010%, surplus is Fe.
Aforesaid 700MPa level Green heat treatment high strength cast iron, its weight percent chemical composition is: C:0.3%, Si:0.7%, Mn:1.9%, Cr:0.06%, Nb:0.05%, V:0.20%, Ni:0.01%, B:0.003%, P:0.021%, S:0.018%, surplus is Fe.
Aforesaid 700MPa level Green heat treatment high strength cast iron, the loading cooling in step (five), is cooled to less than 100 DEG C and unloads maintenance load is constant.
The invention has the beneficial effects as follows:
(1) in present component owing to adding Cr:0.05 ﹣ 0.1%, Nb:0.01 ﹣ 0.05%, V:0.10 ﹣ 0.20%, Ni:0.01 ﹣ 0.03%, B:0.002 ﹣ 0.004%, thus the atom active that can improve C and N element, the air mass that each atom is formed can form strong interaction with dislocation, pinning dislocation, produces yield point elongation; Wherein: Cr, increase the hardening capacity of steel, significantly improve intensity, hardness and wear resistance, too increase solidity to corrosion and the resistance of oxidation of steel; Ni, improves the intensity of steel, and keeps good plasticity and toughness.Nickel has higher corrosion resistance to soda acid, at high temperature has antirust and temperature capacity; Nb, the superheated susceptivity of crystal grain thinning and reduction steel and temper brittleness, improve intensity, also can prevent intergranular corrosion phenomenon; B, can improve compactness and the hot rolling performance of steel, improves intensity.
(2) in working method of the present invention, steel billet enters stove preheating section temperature and controls below 700 DEG C, Heating temperature is 950 ~ 1200 DEG C, heating 1 ~ 3h, roughing temperature is 945 ~ 1220 DEG C, roughing completes temperature and controls more than 950, finishing temperature is 870 ~ 895 DEG C, weakly after hot rolling be chilled to 830 ~ 940 DEG C, naturally cool to room temperature again, the grain fineness number of the reinforcing bar after effective guarantee rolling reaches more than 9 grades, reinforcing bar rapid heating after rolling stops growing up of autstenitic grain size, keep close grain state, after ensure that subsequent heat treatment, the grain fineness number of finished product reinforcing bar reaches more than 11 grades, super-high-plasticity is kept while grain refining process can improve rapidly yield strength and tensile strength.
(3) in working method of the present invention, the first refrigerating work procedure in step (two) adopts water-cooled to be combined with air cooling, be followed successively by: water-cooled-air cooling-water-cooled-air cooling, like this, carbide can be made fully to dissolve further, even diffusion, avoids carbide and causes intergranular corrosion and spot corrosion to exceed standard in the precipitation of intergranular.
(4) air cooling is carried out, good cooling results, decreasing pollution on the reinforcing bar in process steps of the present invention (three) after tempering is cooling bed again, protection of the environment and cost is low.
(5) in working method of the present invention, the first refrigerating work procedure cools the technical scheme combined with follow-up second refrigerating work procedure Slow cooling fast, make the obvious fragmentation of cementite in original rolling concrete steel bar, but keep certain ordered arrangement, allow ferrite form continuous structure simultaneously, its dislocation glide when deformation is become be easier to, be conducive to improving plasticity.
(6) high tempering reduces intensity, improves plasticity, can impel heat-treated steel bar stabilization, because this Technology does not form highdensity dislocation, thus forms yield point elongation.
(7) through the grain stabilized process of follow-up reinforcing bar, the yield point elongation of this reinforcing bar can be kept not extend in time and disappear, play the effect of carbon reequilibrate.
(8) due in prior art, need continuous drawing, just acid washing phosphorization operation must be had for the ease of continuous drawing, and the application is without the need to continuous drawing, first smelt and roll into the heating of screwed reinforcing bar feeding inductor block afterwards, without the need to acid washing phosphorization operation, do not use hydrochloric acid or sulfuric acid to carry out pickling and phosphatization, avoid polluting the advantage with environmental protection.
Embodiment
Embodiment 1
A kind of 700MPa level Green heat treatment high strength cast iron that the present embodiment provides, its weight percent chemical composition is: C:0.24%, Si:0.6%, Mn:1.6%, Cr:0.08%, Nb:0.02%, V:0.10%, Ni:0.03%, B:0.002%, P:0.020%, S:0.015%, surplus is Fe.
The working method of the 700MPa level Green heat treatment high strength cast iron of the present embodiment, carry out according to the following steps:
(1) using the Chemical Composition containing aforementioned proportion as raw material, steel billet is obtained after converter smelting, refining treatment, continuous casting, steel billet enters stove preheating section temperature and controls at 660 DEG C, and Heating temperature is 970 DEG C, heating 2h, roughing temperature is 980 DEG C, roughing completes temperature and controls at 1000 DEG C, and finishing temperature is 870 DEG C, hot rolling of steel billet is become the threaded reinforcing bar of surface band, weakly after hot rolling be chilled to 850 DEG C, then naturally cool to room temperature;
(2) reinforcing bar good for rolling in step one is sent into process furnace and be heated to 860 DEG C, then the first refrigerating work procedure cool to room temperature;
First refrigerating work procedure is specially: adopt water-cooled to be combined with air cooling, first adopt water-cooled with the rate of cooling of 4.3 DEG C/s by reinforcing bar water-cooled to 400 DEG C, then air cooling to 220 DEG C, then adopt water-cooled with the rate of cooling of 2.9 DEG C/s by reinforcing bar water-cooled to 175 DEG C, last air cooling is to room temperature;
(3) reinforcing bar cooled in step 2 is heated to 570 DEG C through tempering induction heater, after being then incubated 7 seconds, by the second refrigerating work procedure cool to room temperature;
Second refrigerating work procedure is specially: on cooling bed, carry out air cooling to reinforcing bar, first with the speed of cooling of 4 DEG C per second, reinforcing bar is cooled to 550 DEG C, and then progressively cools to room temperature;
(4) reinforcing bar cooled in step 3 is heated to 400 DEG C of insulations 60 minutes, carries out grain stabilized process;
(5) reinforcing bar of stabilized process is carried out loading cooling, be cooled to 80 DEG C and unload again maintenance load is constant.
Embodiment 2
A kind of 700MPa level Green heat treatment high strength cast iron that the present embodiment provides, its weight percent chemical composition is: C:0.18%, Si:0.8%, Mn:1.3%, Cr:0.1%, Nb:0.03%, V:0.15%, Ni:0.02%, B:0.004%, P:0.018%, S:0.010%, surplus is Fe.
The working method of the 700MPa level Green heat treatment high strength cast iron of the present embodiment, carry out according to the following steps:
(1) using the Chemical Composition containing aforementioned proportion as raw material, steel billet is obtained after converter smelting, refining treatment, continuous casting, steel billet enters stove preheating section temperature and controls at 620 DEG C, and Heating temperature is 1200 DEG C, heating 3h, roughing temperature is 1000 DEG C, roughing completes temperature and controls at 980 DEG C, and finishing temperature is 890 DEG C, hot rolling of steel billet is become the threaded reinforcing bar of surface band, weakly after hot rolling be chilled to 830 DEG C, then naturally cool to room temperature;
(2) reinforcing bar good for rolling in step one is sent into process furnace and be heated to 890 DEG C, then the first refrigerating work procedure cool to room temperature;
First refrigerating work procedure is specially: adopt water-cooled to be combined with air cooling, first adopt water-cooled with the rate of cooling of 3.8 DEG C/s by reinforcing bar water-cooled to 390 DEG C, then air cooling to 280 DEG C, then adopt water-cooled with the rate of cooling of 3.1 DEG C/s by reinforcing bar water-cooled to 185 DEG C, last air cooling is to room temperature;
(3) reinforcing bar cooled in step 2 is heated to 550 DEG C through tempering induction heater, after being then incubated 6 seconds, by the second refrigerating work procedure cool to room temperature;
Second refrigerating work procedure is specially: on cooling bed, carry out air cooling to reinforcing bar, first with the speed of cooling of 7 DEG C per second, reinforcing bar is cooled to 490 DEG C, and then progressively cools to room temperature;
(4) reinforcing bar cooled in step 3 is heated to 390 DEG C of insulations 67 minutes, carries out grain stabilized process;
(5) reinforcing bar of stabilized process is carried out loading cooling, be cooled to 60 DEG C and unload again maintenance load is constant.
Embodiment 3
A kind of 700MPa level Green heat treatment high strength cast iron that the present embodiment provides, its weight percent chemical composition is: C:0.3%, Si:0.7%, Mn:1.9%, Cr:0.06%, Nb:0.05%, V:0.20%, Ni:0.01%, B:0.003%, P:0.021%, S:0.018%, surplus is Fe.
The working method of the 700MPa level Green heat treatment high strength cast iron of the present embodiment, carry out according to the following steps:
(1) using the Chemical Composition containing aforementioned proportion as raw material, steel billet is obtained after converter smelting, refining treatment, continuous casting, steel billet enters stove preheating section temperature and controls at 500 DEG C, and Heating temperature is 1000 DEG C, heating 1h, roughing temperature is 1100 DEG C, roughing completes temperature and controls at 1200 DEG C, and finishing temperature is 880 DEG C, hot rolling of steel billet is become the threaded reinforcing bar of surface band, weakly after hot rolling be chilled to 840 DEG C, then naturally cool to room temperature;
(2) reinforcing bar good for rolling in step one is sent into process furnace and be heated to 900 DEG C, then the first refrigerating work procedure cool to room temperature;
First refrigerating work procedure is specially: adopt water-cooled to be combined with air cooling, first adopt water-cooled with the rate of cooling of 4.0 DEG C/s by reinforcing bar water-cooled to 420 DEG C, then air cooling to 300 DEG C, then adopt water-cooled with the rate of cooling of 2.7 DEG C/s by reinforcing bar water-cooled to 190 DEG C, last air cooling is to room temperature;
(3) reinforcing bar cooled in step 2 is heated to 600 DEG C through tempering induction heater, after being then incubated 8 seconds, by the second refrigerating work procedure cool to room temperature;
Second refrigerating work procedure is specially: on cooling bed, carry out air cooling to reinforcing bar, first with the speed of cooling of 5 DEG C per second, reinforcing bar is cooled to 520 DEG C, and then progressively cools to room temperature;
(4) reinforcing bar cooled in step 3 is heated to 420 DEG C of insulations 75 minutes, carries out grain stabilized process;
(5) reinforcing bar of stabilized process is carried out loading cooling, be cooled to 35 DEG C and unload again maintenance load is constant.
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 application claims.
Claims (5)
1. a working method for 700MPa level Green heat treatment high strength cast iron, its weight percent chemical composition is: C:0.18 ﹣ 0.3%, Si:0.6 ﹣ 0.9%, Mn:1.3 ﹣ 1.9%; Cr:0.05 ﹣ 0.1%, Nb:0.01 ﹣ 0.05%, V:0.10 ﹣ 0.20%, Ni:0.01 ﹣ 0.03%, B:0.002 ﹣ 0.004%, P<0.023%, S<0.023%, surplus is Fe, it is characterized in that: the working method of this high strength cast iron is carried out according to the following steps:
(1) using the Chemical Composition containing aforementioned proportion as raw material, steel billet is obtained after converter smelting, refining treatment, continuous casting, steel billet enters stove preheating section temperature and controls below 700 DEG C, and Heating temperature is 950 ~ 1200 DEG C, heating 1 ~ 3h, roughing temperature is 945 ~ 1220 DEG C, roughing completes temperature and controls more than 950 DEG C, and finishing temperature is 870 ~ 895 DEG C, hot rolling of steel billet is become the threaded reinforcing bar of surface band, weakly after hot rolling be chilled to 830 ~ 940 DEG C, then naturally cool to room temperature;
(2) reinforcing bar good for rolling in step one is sent into process furnace and be heated to 840-920 DEG C, then the first refrigerating work procedure cool to room temperature;
Described first refrigerating work procedure is specially: adopt water-cooled to be combined with air cooling, first adopt water-cooled with the rate of cooling of 3.8-4.3 DEG C/s by reinforcing bar water-cooled to 390-420 DEG C, then air cooling is to 200-310 DEG C, adopt again water-cooled with the rate of cooling of 2.7-3.5 DEG C/s by reinforcing bar water-cooled to 175-190 DEG C, last air cooling is to room temperature;
(3) reinforcing bar cooled in step 2 is heated to 550-610 DEG C through tempering induction heater, after being then incubated 6-9 second, by the second refrigerating work procedure cool to room temperature;
Described second refrigerating work procedure is specially: on cooling bed, carry out air cooling to reinforcing bar, first with the speed of cooling of 3-7 per second DEG C, reinforcing bar is cooled to 490-560 DEG C, and then progressively cools to room temperature;
(4) reinforcing bar cooled in step 3 is heated to 390-420 DEG C of insulation more than 50 minutes, carries out grain stabilized process;
(5) reinforcing bar of stabilized process is carried out loading cooling.
2. the working method of 700MPa level Green heat treatment high strength cast iron according to claim 1, it is characterized in that: its weight percent chemical composition is: C:0.24%, Si:0.6%, Mn:1.6%, Cr:0.08%, Nb:0.02%, V:0.10%, Ni:0.03%, B:0.002%, P:0.020%, S:0.015%, surplus is Fe.
3. the working method of 700MPa level Green heat treatment high strength cast iron according to claim 1, it is characterized in that: its weight percent chemical composition is: C:0.18%, Si:0.8%, Mn:1.3%, Cr:0.1%, Nb:0.03%, V:0.15%, Ni:0.02%, B:0.004%, P:0.018%, S:0.010%, surplus is Fe.
4. the working method of 700MPa level Green heat treatment high strength cast iron according to claim 1, it is characterized in that: its weight percent chemical composition is: C:0.3%, Si:0.7%, Mn:1.9%, Cr:0.06%, Nb:0.05%, V:0.20%, Ni:0.01%, B:0.003%, P:0.021%, S:0.018%, surplus is Fe.
5. the working method of 700MPa level Green heat treatment high strength cast iron according to claim 1, is characterized in that: loading in described step (five) cooling, is cooled to less than 100 DEG C and unloads maintenance load is constant.
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| CN108866430A (en) * | 2018-06-06 | 2018-11-23 | 荣马电器有限公司 | A kind of high reliability air switch cabinet |
| CN111570537B (en) * | 2020-05-22 | 2022-02-11 | 江苏联峰实业有限公司 | Hot rolling process for improving strength and fracture toughness of steel bar |
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Effective date of registration: 20171214 Address after: Eight 212219 Jiangsu province Zhenjiang Qiao Zhen Chang Sheng Cun of Yangzhong City Patentee after: Jiangsu forest building new material Limited by Share Ltd Address before: 212219 Jiangsu city of Zhenjiang province Yangzhong City eight Town Bridge Industrial Zone Patentee before: Jiangsu Tianshun Metal Material Group Co., Ltd. |