CN100419113C - High-strength deformed steel bar and method of manufacturing same - Google Patents
High-strength deformed steel bar and method of manufacturing same Download PDFInfo
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- CN100419113C CN100419113C CNB2006101253474A CN200610125347A CN100419113C CN 100419113 C CN100419113 C CN 100419113C CN B2006101253474 A CNB2006101253474 A CN B2006101253474A CN 200610125347 A CN200610125347 A CN 200610125347A CN 100419113 C CN100419113 C CN 100419113C
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Abstract
The invention discloses a high-strength strew steel and manufacturing method, which comprises the following parts: 0.18-0.25% C, 0.3-0.7% Si, 1.40-1.80% Mn,0.08-0.18% V, 0.24-0.33% Cr, 0.2-0.3% Mo, 0.04-0.12% Ni,0.01-0.05% Als, not more than 0.025% P, not more than 0.015% S,Fe and inevitable impurity.
Description
Technical field
The present invention relates to rolling shapes, especially belong to high-strength deformed steel bar and production method thereof.
Background technology
High-strength finish rolling deformed bar is rolling on whole reinforcing bar the high strength of outward turning screw thread, the reinforcing bar of high dimensional accuracy to be arranged.This reinforcing bar can connect with the junctor that has internal thread at any truncation surface place or the screwed nut of screwing on carries out rivet clasp.It has the weldability of not being subjected to constraint, connects characteristics such as rivet clasp is easy, clinging power strong, the stretch-draw rivet clasp is safe and reliable, easy construction.
At present, conventional high-strength finish rolling deformed bar production all is to roll out the work in-process that have the outward turning screw thread on common rod hot rolling machine, utilize the waste heat after the reinforcing bar hot rolling to heat-treat again, its technical process is: steel billet (or continuously cast bloom) heating → rolling → wear water cooling → self-tempering → cold bed cooling → cutting to length → tack → quality inspection packing → warehouse-in.Usually, 1100 ℃～1150 ℃ of start rolling temperatures, wear 950 ℃～1000 ℃ of the preceding temperature of water, cooled off 1.5 seconds, the finish rolling deformed bar surface temperature is below 400 ℃ after wearing water, the finish rolling deformed bar temperature recovery is 700 ℃～800 ℃ to the cold bed, though this processing method has save energy, productivity height, low cost and other advantages.But the deficiency that exists: be subjected to multiple factor affecting fluctuation such as rolling line operation seasonal climate, water temperature bigger owing to wear the temperature of the preceding reinforcing bar of water itself, cause reinforcement property instability after the thermal treatment, the through hardening layer is very shallow, centre crystal grain is thick, and can not give full play to the potential of finish rolling deformed bar self, have phenomenon such as fracture to take place in the time of in actual applications, and this reinforcing bar belong to can not welded reinforcement.
The Chinese patent publication number is CN1453375, name is called " a kind of continuous induction heat treatment process for high-strength finish-rolled spiral steel bar " patent documentation, in order to improve the stability of finish rolling deformed bar quality product, the technology that adopts the high-strength finish rolling deformed bar that this patented technology produces is disclosed, promptly by adopting continuous induction heat treatment process to replace the waste heat after original hot rolling to wear the production that cooling process carries out finish rolling deformed bar.Induction heat treatment process adopts induction heater to quench and tempering heating, employing watercooler carry out quench treatment, and 800～1000 ℃ of quenching temperatures, tempering temperature are 500～700 ℃; Disclosed this finish rolling deformed bar chemical ingredients is: C:0.40～0.60%, Si:0.60～2.0%, Mn:0.60～2.0%, Mo:0.10～0.40%, V:0.10～0.30%, Cr:0.30～1.20%, Ti:0.01～0.10%, B:0.002～0.05%, P, S≤0.03%.Its deficiency:
1, owing to adopt induction heat treatment process, needs special-purpose induction heater equipment, thermal processing equipment etc.;
2, the plasticity and toughness of the open finish rolling deformed bar product of this art breading are lower, can not satisfy in the use high-ductility and high tenacity requirement to the high-intensity fine rolling reinforcing bar.
Summary of the invention
Technical problem to be solved by this invention is: a kind of high-strength deformed steel bar and production method thereof are provided, and this high-strength deformed steel bar has higher strength and toughness and plasticity, and good, the treatment production simple and reliable process of weldability energy, constant product quality.
The present invention solves the problems of the technologies described above the technical scheme that is adopted:
High-strength deformed steel bar, its chemical ingredients and weight percent content are C:0.18～0.25%, Si:0.3～0.7%, Mn:1.40～1.80%, V:0.08～0.18%, Cr:0.24～0.33%, Mo:0.2～0.3%, Ni:0.04～0.12%, Als:0.01～0.05%, P≤0.025%, S≤0.015%, and all the other are Fe and unavoidable impurities.
In the such scheme, the weight percentage of C is 0.2～0.23% the best.
In the such scheme, the weight percent content of Cr is 0.24～0.3% the best.
In the such scheme, the weight percent content of V is: 0.1～0.13% the best.
In the such scheme, the weight percent content of Mo is: 0.23～0.3% the best.
In the such scheme, the weight percent content of Ni is: 0.07～0.09% the best.
In the such scheme, the weight percent content of Als is: 0.02～0.04% the best.
Produce the method for above-mentioned high-strength deformed steel bar, its step:
1) adopt converter smelting, and continuous casting becomes base after the refining of LF stove;
2) with the continuously cast bloom stacking and naturally cool to normal temperature;
3) continuously cast bloom under the normal temperature is heated to 1200～1300 ℃;
4) adopt the semi continuous merchant bar mill to be rolled, its start rolling temperature is controlled at 1100～1180 ℃, and finishing temperature is controlled at 880～950 ℃;
5) adopt the naturally cooling mode, on cold bed, make reinforcing bar be cooled to normal temperature;
6) carry out double length shearing, shear temperature≤200 ℃;
7) with reinforcing bar scale and tack behind the double length shearing, after the hopper of packing into heat-treat, heat treated quenching temperature is 880～920 ℃, carries out shrend, tempering temperature is 400～450 ℃;
8) carry out forming process, finishing, quality inspection and warehouse-in.
The mechanism of each component and effect among the present invention:
In each chemical ingredients of high-strength deformed steel bar, carbon (C) content is 0.18～0.25%, and carbon is the element of raising Twisted Steel intensity most economical in the steel, plays solution strengthening in steel, increase that carbon content can improve the intensity of steel but the plasticity and toughness that reduce steel, and its welding property is worsened.In order to guarantee that reinforcing bar of the present invention has higher strength and toughness, good weldability and cold formability, carbon (C) content is limited to 0.20～0.23% for best.
Silicon of the present invention (Si) content is 0.30～0.7%, Si mainly is the matrix strength that improves steel with the solution strengthening form, help improving hardening capacity, temper resistance and the oxidation-resistance that improves steel had very big benefit, but too high easy generation surface decarburization of silicone content and reduction weldability energy.
Contain Mo in the composition of steel of the present invention, the weight percent of Mo is 0.20～0.30%, 0.23～0.3% the best, and Mo has the effect of refine pearlite, thereby improves the intensity and the ductility of steel, improves hardening capacity simultaneously.Mo can also eliminate or alleviate because of other alloying element (Cr, Mn etc.) temper brittleness that is caused and help the impelling strength of steel greatly.
The adding of Cr alloy can improve steel hardenability, the refine pearlite tissue, and the intensity and the temper resistance energy of raising steel, but temper brittleness is more remarkable with the increase of Cr content.In the present invention, the content of Cr is controlled at 0.24～0.33%, and 0.24～0.30% is best.
The adding of Ni alloy can significantly improve plasticity, room temperature and the low-temperature flexibility of steel, and base material and welded heat affecting zone low-temperature flexibility are increased substantially.In the present invention, the content of Ni is controlled at 0.04～0.12% scope, 0.07～0.09% the best.
Manganese of the present invention (Mn) content is controlled in 1.40～1.80% scopes, in steel, play the solution strengthening effect, can improve ferrite and austenitic hardness and intensity in the steel, the effect of refine pearlite is arranged, help improving hardening capacity, but when manganese content is higher, increase the superheated susceptivity and the temper brittleness tendency of steel.
The molten aluminium of acid of the present invention (Als) content is controlled in 0.01～0.05% scope 0.02～0.04% the best.Al is the main deoxidant element in the steel, but the Al too high levels will cause the oxide inclusion content of Al to increase, and reduce the purity of steel, be unfavorable for the toughness of steel.Cross low sour molten aluminium (Als) content and then can cause the deoxidation deficiency, make the continuously cast bloom subsurface bubble too much, easily cause the rebar surface tiny crack.
V content of the present invention is 0.08～0.18%, 0.1～0.13% is best, V separates out by the carbon, the nitrides precipitate that contain vanadium, make grain refining, make reinforcing bar less to the toughness influence when improving intensity, but during the V too high levels, a part of V produce to precipitate and separate out in steel, more V then plays the solution strengthening effect in steel, reduce the plasticity and toughness energy of reinforcing bar.
Phosphorus (P), sulphur (S) in reinforcing bar as harmful element, steel inclusion, the plasticity and toughness energy of reduction steel, deterioration welding property have been increased, therefore, working strength and the work reliability thereof of considering reinforcing bar of the present invention require high, reduce phosphorus, element sulphur disadvantageous effect to reinforcement property as far as possible, by adopting molten iron is carried out means such as dark desulfurization pre-treatment, slag making, make phosphorus (P) content≤0.025%, sulphur (S) content≤0.015% among the present invention.
Advantage of the present invention: having higher strength and toughness energy, weldability can be good; The heat treating facilities investment is less, and production technique is easy to control, constant product quality.
Embodiment
The inventive method embodiment the steps include:
1) adopt converter smelting, and continuous casting becomes base after the refining of LF stove;
2) with the continuously cast bloom stacking and naturally cool to normal temperature;
3) continuously cast bloom under the normal temperature is heated to 1200～1300 ℃;
4) adopt the semi continuous merchant bar mill to be rolled, its start rolling temperature is controlled at 1100～1180 ℃, and finishing temperature is controlled at 880～950 ℃;
5) adopt the naturally cooling mode, on cold bed, make reinforcing bar be cooled to normal temperature;
6) carry out double length shearing, shear temperature≤200 ℃;
7) with reinforcing bar scale and tack behind the double length shearing, after the hopper of packing into heat-treat, heat treated quenching temperature is 880～920 ℃, carries out shrend, tempering temperature is 400～450 ℃;
8) carry out forming process, finishing, quality inspection and warehouse-in.
Through experiment, the composition of high-strength deformed steel bar sees Table 1, and all the other are Fe and unavoidable impurities.
High-intensity fine rolling Deformed Steel Bars embodiment 1～9 of the present invention, all reach the performance requriements of the high-strength deformed steel bar muscle of yield strength Rel 〉=980MPa, tensile strength Rm 〉=1080MPa, unit elongation A 〉=10%, but the yield strength of embodiment 1～3 is on the low side, the unit elongation of embodiment 7～9 is lower, therefore, embodiment 4～6 is an optimum implementation.
Table 1:
| Embodiment | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| C | 0.18 | 0.2 | 0.21 | 0.20 | 0.23 | 0.21 | 0.25 | 0.23 | 0.24 |
| Si | 0.35 | 0.39 | 0.40 | 0.44 | 0.50 | 0.6 | 0.55 | 0.65 | 0.70 |
| Mn | 1.4 | 1.43 | 1.5 | 1.5 | 1.54 | 1.45 | 1.71 | 1.80 | 1.62 |
| V | 0.10 | 0.09 | 0.08 | 0.10 | 0.11 | 0.13 | 0.17 | 0.15 | 0.16 |
| Cr | 0.3 | 0.29 | 0.26 | 0.24 | 0.26 | 0.30 | 0.28 | 0.24 | 0.33 |
| Mo | 0.20 | 0.20 | 0.21 | 0.24 | 0.23 | 0.30 | 0.24 | 0.30 | 0.28 |
| Ni | 0.05 | 0.04 | 0.06 | 0.08 | 0.07 | 0.09 | 0.09 | 0.12 | 0.10 |
| Als | 0.01 | 0.04 | 0.03 | 0.03 | 0.02 | 0.04 | 0.05 | 0.03 | 0.03 |
| P | 0.016 | 0.010 | 0.015 | 0.010 | 0.013 | 0.010 | 0.014 | 0.012 | 0.015 |
| S | 0.005 | 0.003 | 0.003 | 0.002 | 0.004 | 0.002 | 0.008 | 0.006 | 0.003 |
| Yield strength | 980 | 980 | 985 | 1040 | 1080 | 1060 | 1140 | 1130 | 1160 |
| Tensile strength | 1080 | 1090 | 1085 | 1120 | 1160 | 1140 | 1250 | 1200 | 1280 |
| Extensibility % | 14 | 14 | 13 | 13 | 12 | 13 | 10 | 10 | 10 |
Claims (8)
1. high-strength deformed steel bar, it is characterized in that: its chemical ingredients and weight percent content are C:0.18～0.25%, Si:0.3～0.7%, Mn:1.40～1.80%, V:0.08～0.18%, Cr:0.24～0.33%, Mo:0.2～0.3%, Ni:0.04～0.12%, Als:0.01～0.05%, P≤0.025%, S≤0.015%, and all the other are Fe and unavoidable impurities.
2. Deformed Steel Bars according to claim 1 is characterized in that: the weight percentage of C is 0.2～0.23%.
3. Deformed Steel Bars according to claim 1 is characterized in that: the weight percent content of Cr is 0.24～0.3%.
4. Deformed Steel Bars according to claim 1 is characterized in that: the weight percent content of V is: 0.1～0.13%.
5. Deformed Steel Bars according to claim 1 is characterized in that: the weight percent content of Mo is: 0.23～0.3%.
6. Deformed Steel Bars according to claim 1 is characterized in that: the weight percent content of Ni is: 0.07～0.09%.
7. Deformed Steel Bars according to claim 1 is characterized in that: the weight percent content of Als is: 0.02～0.04%.
8. produce the method for high-strength deformed steel bar according to claim 1, its step:
1) adopt converter smelting, and continuous casting becomes base after the refining of LF stove;
2) with the continuously cast bloom stacking and naturally cool to normal temperature;
3) continuously cast bloom under the normal temperature is heated to 1200～1300 ℃;
4) adopt the semi continuous merchant bar mill to be rolled, its start rolling temperature is controlled at 1100～1180 ℃, and finishing temperature is controlled at 880～950 ℃;
5) adopt the naturally cooling mode, on cold bed, make reinforcing bar be cooled to normal temperature;
6) carry out double length shearing, shear temperature≤200 ℃;
7) with reinforcing bar scale and tack behind the double length shearing, after the hopper of packing into heat-treat, heat treated quenching temperature is 880～920 ℃, carries out shrend, tempering temperature is 400～450 ℃;
8) carry out forming process, finishing, quality inspection and warehouse-in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101253474A CN100419113C (en) | 2006-12-07 | 2006-12-07 | High-strength deformed steel bar and method of manufacturing same |
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| CNB2006101253474A CN100419113C (en) | 2006-12-07 | 2006-12-07 | High-strength deformed steel bar and method of manufacturing same |
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| CN1970817A CN1970817A (en) | 2007-05-30 |
| CN100419113C true CN100419113C (en) | 2008-09-17 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101831596B (en) * | 2010-05-18 | 2011-12-14 | 武汉科技大学 | High-strength deformed steel bar and manufacture method thereof |
| CN102618691B (en) * | 2012-04-16 | 2014-07-02 | 四川省达州钢铁集团有限责任公司 | Method for producing HRB 600 high-strength steel through micro-alloying |
| CN102732787B (en) * | 2012-07-20 | 2013-12-25 | 江苏省沙钢钢铁研究院有限公司 | 600MPa level quake-proof twisted steel and manufacturing method thereof |
| CN102839334B (en) * | 2012-08-30 | 2014-03-12 | 江苏永钢集团有限公司 | 600MPa-level steel for hot-rolled steel bar with ribs and smelting method thereof |
| CN104480410A (en) * | 2014-12-13 | 2015-04-01 | 广西科技大学 | Formula of half grouting type high-strength thick reinforcing bar |
| CN107604261A (en) * | 2017-07-18 | 2018-01-19 | 河钢股份有限公司承德分公司 | Mark SD345 spirals with ribbing and its production method a kind of day |
| CN110421015B (en) * | 2019-08-14 | 2020-11-24 | 涡阳县顺隆智能科技有限公司 | Deformed steel bar production process |
| CN112458245A (en) * | 2020-11-06 | 2021-03-09 | 江苏沙钢集团有限公司 | Method for rapidly detecting performance of hot rolled ribbed steel bar on line through quenching |
| CN116219279B (en) * | 2022-12-23 | 2024-04-16 | 鞍钢股份有限公司 | High-strength high-toughness steel for nuclear reactor containment vessel and manufacturing method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001234275A (en) * | 2000-02-21 | 2001-08-28 | Sanyo Special Steel Co Ltd | Case hardening steel excellent in rolling fatigue life in quasi-high temperature environment |
| US6953508B2 (en) * | 2003-01-02 | 2005-10-11 | Sumitomo Metal Industries, Ltd. | High strength steel weld having improved resistance to cold cracking and a welding method |
| CN1234887C (en) * | 2002-04-28 | 2006-01-04 | 鞍钢集团新钢铁有限责任公司 | Continuous induction heat treatment process for high-strength finish-rolled spiral steel bar |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001234275A (en) * | 2000-02-21 | 2001-08-28 | Sanyo Special Steel Co Ltd | Case hardening steel excellent in rolling fatigue life in quasi-high temperature environment |
| CN1234887C (en) * | 2002-04-28 | 2006-01-04 | 鞍钢集团新钢铁有限责任公司 | Continuous induction heat treatment process for high-strength finish-rolled spiral steel bar |
| US6953508B2 (en) * | 2003-01-02 | 2005-10-11 | Sumitomo Metal Industries, Ltd. | High strength steel weld having improved resistance to cold cracking and a welding method |
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