CN103643167A - 700MPa-grade green-heat-treatment high-strength steel bar and processing method thereof - Google Patents
700MPa-grade green-heat-treatment high-strength steel bar and processing method thereof Download PDFInfo
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- CN103643167A CN103643167A CN201310584550.8A CN201310584550A CN103643167A CN 103643167 A CN103643167 A CN 103643167A CN 201310584550 A CN201310584550 A CN 201310584550A CN 103643167 A CN103643167 A CN 103643167A
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Abstract
The invention discloses a 700MPa-grade green-heat-treatment high-strength steel bar and a processing method thereof. The high-strength steel bar comprises 0.18-0.3wt% of C, 0.6-0.9wt% of Si, 1.3-1.9wt% of Mn, 0.05-0.1wt% of Cr, 0.01-0.05wt% of Nb, 0.10-0.20wt% of V, 0.01-0.03% of Ni, 0.002-0.004wt% of B, below 0.023wt% of P, below 0.023wt% of S, and the balance Fe. The high-strength steel bar has the advantages of realization of the yield strength reaching 700MPa, obvious yield point elongation, no disappearance of the yield point elongation with the prolongation of time, strong delayed fracture resistance and high plasticity, and processing method of the high-strength steel bar has the advantages of simplicity, easy operation, less pollution, electric energy and steel resource saving, and low production cost.
Description
Technical field
The present invention relates to a kind of High Strength Steel Bar and working method thereof, be specifically related to a kind of 700MPa level Green heat treatment high strength cast iron and working method thereof.
Background technology
At present, due to house property cause, the development of machinery cause etc., the demand of iron and steel improves greatly, requirement to iron and steel is also more and more higher, the yield strength of existing hot-rolled reinforced bar is all lower, allow hot-rolled reinforced bar yield strength reach 630Mpa and above so high intensity is very difficult thing, and intensity reaches so high, be difficult to guarantee to occur yield point elongation, " accelerating to eliminate 335 MPa level Twisted Steels " just proposed in country's Iron And Steel Industry " 12 " planning, " strengthen the research of High Strength Steel Bar and High Strength Concrete Structures member 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 is mainly reached and is put forward high-intensity object by interpolation " V " or " VN " alloy, addition reaches 0.15% left and right, 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 changed by alloy ingredient, production rate, the restriction of the factors such as smelting and rolling technology, the quality product of producing is also unstable, often occur that intensity is low, the underproof phenomenon of strong flexor ratio, particularly the product of the following specification of 14mm is more serious.Patent of invention (application number: 201110086374.6), disclosed steel are produced through proportioning components, heating, cooling, quenching, tempering process, this process choice steel ingredient change and through twice temperature-rise period, smelting cost and power consumption cost have been improved to a certain extent, but its plasticity is low and strong flexor ratio is less, easily there is moment fracture, cause the accidents such as whole fracture, in addition there is the shortcomings such as serious environmental pollution, waste electric energy and steel resources, production cost be higher in existing thermal treatment high strength cast iron working method.A kind of reaching overcomes the 700MPa of above defect and above high strength cast iron and working method thereof and 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, the shortcoming existing for above prior art, a kind of 700MPa level Green heat treatment high strength cast iron and working method thereof are proposed, described high strength cast iron yield strength reaches 700MPa, have obvious yield point elongation and yield point elongation not to extend in time and disappear, anti-delayed fracture 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 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 that contains aforementioned proportion as raw material, after converter smelting, refining treatment, continuous casting, obtain steel billet, steel billet enters stove preheating section temperature and is controlled at below 700 ℃, and Heating temperature is 950～1200 ℃, heating 1～3h, roughing temperature is 945～1220 ℃, roughing completes temperature and is controlled at more than 950, and finishing temperature is 870～895 ℃, and hot rolling of steel billet is become to the threaded reinforcing bar of surface band, a little less than after hot rolling, be chilled to 830～940 ℃, then naturally cool to room temperature;
(2) the good reinforcing bar of rolling in step 1 is sent into process furnace and be heated to 840-920 ℃, then the first refrigerating work procedure cool to room temperature;
The 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 ℃/s by reinforcing bar water-cooled to 390-420 ℃, then air cooling is to 200-310 ℃, adopt again water-cooled with the rate of cooling of 2.7-3.5 ℃/s by reinforcing bar water-cooled to 175-190 ℃, last air cooling is to room temperature;
(3) cooling good reinforcing bar in step 2 is heated to 550-610 ℃ through tempering induction heater, is then incubated 6-9 after second, by the second refrigerating work procedure cool to room temperature;
The second refrigerating work procedure is specially: on cooling bed, reinforcing bar is carried out to air cooling, the first speed of cooling with 3-7 per second ℃ is cooled to 490-560 ℃ by reinforcing bar, and then Slow cooling is to room temperature;
(4) cooled reinforcing bar in step 3 is heated to 390-420 ℃ of insulation more than 50 minutes, carries out crystal grain stabilization treatment;
(5) reinforcing bar of stabilized processing is loaded cooling.
The technical scheme that the present invention further limits 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 in step (five) is cooling, and load is constant to be cooled to 100 ℃ and to unload below again maintaining.
The invention has the beneficial effects as follows:
(1) in composition of the present invention 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 it is active to improve the atom of C and N element, and the air mass that each atom is formed can form strong interaction with dislocation, pinning dislocation, produces yield point elongation; Wherein: Cr, the hardening capacity of increase steel, significantly improves intensity, hardness and wear resistance, has also increased 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, superheated susceptivity and the temper brittleness of crystal grain thinning and reduction steel, 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 is controlled at below 700 ℃, Heating temperature is 950～1200 ℃, heating 1～3h, roughing temperature is 945～1220 ℃, roughing completes temperature and is controlled at more than 950, finishing temperature is 870～895 ℃, a little less than after hot rolling, be chilled to 830～940 ℃, naturally cool to again room temperature, the grain fineness number that effectively guarantees the reinforcing bar after rolling reaches more than 9 grades, reinforcing bar rapid heating after rolling stops growing up of autstenitic grain size, keep close grain state, guaranteed that after subsequent heat treatment, the grain fineness number of finished product reinforcing bar reaches more than 11 grades, grain refining processing keeps super-high-plasticity when 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, can make carbide further fully dissolve, evenly diffusion, has avoided carbide to cause intergranular corrosion and spot corrosion to exceed standard separating out of intergranular.
(4) reinforcing bar after tempering carries out air cooling on cooling bed again in process steps of the present invention (three), and good cooling results, reduces and pollute, and protection of the environment and cost are low.
(5) technical scheme that in working method of the present invention, the first refrigerating work procedure is quick cooling and follow-up the second refrigerating work procedure Slow cooling combines, 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 and be easier to, be conducive to improve plasticity.
(6) high tempering reduces intensity, improves plasticity, can impel heat-treated steel bar stabilization, because this Technology does not form highdensity dislocation, thereby forms yield point elongation.
(7) through follow-up reinforcing bar crystal grain stabilization treatment, can keep the yield point elongation of this reinforcing bar do not extend in time and disappear, play the effect of carbon reequilibrate.
(8) due in prior art, need continuous drawing, for the ease of continuous drawing, just must there is acid washing phosphorization operation, and the application is without continuous drawing, first smelt and roll into afterwards screwed reinforcing bar and send into inductor block heating, without acid washing phosphorization operation, do not use hydrochloric acid or sulfuric acid to carry out pickling and phosphatization, avoid pollution to there is 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 that contains aforementioned proportion as raw material, after converter smelting, refining treatment, continuous casting, obtain steel billet, steel billet enters stove preheating section temperature and is controlled at 660 ℃, and Heating temperature is 970 ℃, heating 2h, roughing temperature is 980 ℃, roughing completes temperature and is controlled at 1000 ℃, and finishing temperature is 870 ℃, and hot rolling of steel billet is become to the threaded reinforcing bar of surface band, a little less than after hot rolling, be chilled to 850 ℃, then naturally cool to room temperature;
(2) the good reinforcing bar of rolling in step 1 is sent into process furnace and be heated to 860 ℃, then the first refrigerating work procedure cool to room temperature;
The 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 ℃/s by reinforcing bar water-cooled to 400 ℃, then air cooling to 220 ℃, then adopt water-cooled with the rate of cooling of 2.9 ℃/s by reinforcing bar water-cooled to 175 ℃, last air cooling is to room temperature;
(3) cooling good reinforcing bar in step 2 is heated to 570 ℃ through tempering induction heater, is then incubated after 7 seconds, by the second refrigerating work procedure cool to room temperature;
The second refrigerating work procedure is specially: on cooling bed, reinforcing bar is carried out to air cooling, the first speed of cooling with 4 ℃ per second is cooled to 550 ℃ by reinforcing bar, and then Slow cooling is to room temperature;
(4) cooled reinforcing bar in step 3 is heated to 400 ℃ of insulations 60 minutes, carries out crystal grain stabilization treatment;
(5) reinforcing bar of stabilized processing is loaded cooling, load is constant to be cooled to 80 ℃ and to unload maintaining.
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 that contains aforementioned proportion as raw material, after converter smelting, refining treatment, continuous casting, obtain steel billet, steel billet enters stove preheating section temperature and is controlled at 620 ℃, and Heating temperature is 1200 ℃, heating 3h, roughing temperature is 1000 ℃, roughing completes temperature and is controlled at 980 ℃, and finishing temperature is 890 ℃, and hot rolling of steel billet is become to the threaded reinforcing bar of surface band, a little less than after hot rolling, be chilled to 830 ℃, then naturally cool to room temperature;
(2) the good reinforcing bar of rolling in step 1 is sent into process furnace and be heated to 890 ℃, then the first refrigerating work procedure cool to room temperature;
The 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 ℃/s by reinforcing bar water-cooled to 390 ℃, then air cooling to 280 ℃, then adopt water-cooled with the rate of cooling of 3.1 ℃/s by reinforcing bar water-cooled to 185 ℃, last air cooling is to room temperature;
(3) cooling good reinforcing bar in step 2 is heated to 550 ℃ through tempering induction heater, is then incubated after 6 seconds, by the second refrigerating work procedure cool to room temperature;
The second refrigerating work procedure is specially: on cooling bed, reinforcing bar is carried out to air cooling, the first speed of cooling with 7 ℃ per second is cooled to 490 ℃ by reinforcing bar, and then Slow cooling is to room temperature;
(4) cooled reinforcing bar in step 3 is heated to 390 ℃ of insulations 67 minutes, carries out crystal grain stabilization treatment;
(5) reinforcing bar of stabilized processing is loaded cooling, load is constant to be cooled to 60 ℃ and to unload maintaining.
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 that contains aforementioned proportion as raw material, after converter smelting, refining treatment, continuous casting, obtain steel billet, steel billet enters stove preheating section temperature and is controlled at 500 ℃, and Heating temperature is 1000 ℃, heating 1h, roughing temperature is 1100 ℃, roughing completes temperature and is controlled at 1200 ℃, and finishing temperature is 880 ℃, and hot rolling of steel billet is become to the threaded reinforcing bar of surface band, a little less than after hot rolling, be chilled to 840 ℃, then naturally cool to room temperature;
(2) the good reinforcing bar of rolling in step 1 is sent into process furnace and be heated to 900 ℃, then the first refrigerating work procedure cool to room temperature;
The 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 ℃/s by reinforcing bar water-cooled to 420 ℃, then air cooling to 300 ℃, then adopt water-cooled with the rate of cooling of 2.7 ℃/s by reinforcing bar water-cooled to 190 ℃, last air cooling is to room temperature;
(3) cooling good reinforcing bar in step 2 is heated to 600 ℃ through tempering induction heater, is then incubated after 8 seconds, by the second refrigerating work procedure cool to room temperature;
The second refrigerating work procedure is specially: on cooling bed, reinforcing bar is carried out to air cooling, the first speed of cooling with 5 ℃ per second is cooled to 520 ℃ by reinforcing bar, and then Slow cooling is to room temperature;
(4) cooled reinforcing bar in step 3 is heated to 420 ℃ of insulations 75 minutes, carries out crystal grain stabilization treatment;
(5) reinforcing bar of stabilized processing is loaded cooling, load is constant to be cooled to 35 ℃ and to unload maintaining.
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 (6)
1. 700MPa level Green heat treatment high strength cast iron and a working method thereof, is characterized in that: 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.
2. 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. 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. 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 the 700MPa level Green heat treatment high strength cast iron as described in arbitrary claim in claim 1-4, is characterized in that: carry out according to the following steps:
(1) using the Chemical Composition that contains aforementioned proportion as raw material, after converter smelting, refining treatment, continuous casting, obtain steel billet, steel billet enters stove preheating section temperature and is controlled at below 700 ℃, and Heating temperature is 950～1200 ℃, heating 1～3h, roughing temperature is 945～1220 ℃, roughing completes temperature and is controlled at more than 950, and finishing temperature is 870～895 ℃, and hot rolling of steel billet is become to the threaded reinforcing bar of surface band, a little less than after hot rolling, be chilled to 830～940 ℃, then naturally cool to room temperature;
(2) the good reinforcing bar of rolling in step 1 is sent into process furnace and be heated to 840-920 ℃, then the first refrigerating work procedure cool to room temperature;
Described the 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 ℃/s by reinforcing bar water-cooled to 390-420 ℃, then air cooling is to 200-310 ℃, adopt again water-cooled with the rate of cooling of 2.7-3.5 ℃/s by reinforcing bar water-cooled to 175-190 ℃, last air cooling is to room temperature;
(3) cooling good reinforcing bar in step 2 is heated to 550-610 ℃ through tempering induction heater, is then incubated 6-9 after second, by the second refrigerating work procedure cool to room temperature;
Described the second refrigerating work procedure is specially: on cooling bed, reinforcing bar is carried out to air cooling, the first speed of cooling with 3-7 per second ℃ is cooled to 490-560 ℃ by reinforcing bar, and then Slow cooling is to room temperature;
(4) cooled reinforcing bar in step 3 is heated to 390-420 ℃ of insulation more than 50 minutes, carries out crystal grain stabilization treatment;
(5) reinforcing bar of stabilized processing is loaded cooling.
6. the working method of 700MPa level Green heat treatment high strength cast iron as claimed in claim 5, is characterized in that: the loading in described step (five) is cooling, and load is constant to be cooled to 100 ℃ and to unload below again maintaining.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105088075A (en) * | 2015-09-07 | 2015-11-25 | 江苏天舜金属材料集团有限公司 | High-strength steel bar and method for controlling width of crack of concrete structural component through high-strength steel bar |
| CN108866430A (en) * | 2018-06-06 | 2018-11-23 | 荣马电器有限公司 | A kind of high reliability air switch cabinet |
| CN111570537A (en) * | 2020-05-22 | 2020-08-25 | 江苏联峰实业有限公司 | Hot rolling process for improving strength and fracture toughness of steel bar |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102181798A (en) * | 2011-04-07 | 2011-09-14 | 江苏天舜金属材料集团有限公司 | Processing method of high yield ratio and high plasticity steel product for prestressed concrete |
| CN102766819A (en) * | 2012-05-24 | 2012-11-07 | 江苏永钢集团有限公司 | High-strength and high-ductility heat treated steel bar and preparation method thereof |
-
2013
- 2013-11-20 CN CN201310584550.8A patent/CN103643167B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102181798A (en) * | 2011-04-07 | 2011-09-14 | 江苏天舜金属材料集团有限公司 | Processing method of high yield ratio and high plasticity steel product for prestressed concrete |
| CN102766819A (en) * | 2012-05-24 | 2012-11-07 | 江苏永钢集团有限公司 | High-strength and high-ductility heat treated steel bar and preparation method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105088075A (en) * | 2015-09-07 | 2015-11-25 | 江苏天舜金属材料集团有限公司 | High-strength steel bar and method for controlling width of crack of concrete structural component through high-strength steel bar |
| CN108866430A (en) * | 2018-06-06 | 2018-11-23 | 荣马电器有限公司 | A kind of high reliability air switch cabinet |
| CN111570537A (en) * | 2020-05-22 | 2020-08-25 | 江苏联峰实业有限公司 | Hot rolling process for improving strength and fracture toughness of steel bar |
| 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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