CN102134679A - Heat treatable overlarge-diameter high-strength steel and preparation methods thereof - Google Patents
Heat treatable overlarge-diameter high-strength steel and preparation methods thereof Download PDFInfo
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- CN102134679A CN102134679A CN2011100421986A CN201110042198A CN102134679A CN 102134679 A CN102134679 A CN 102134679A CN 2011100421986 A CN2011100421986 A CN 2011100421986A CN 201110042198 A CN201110042198 A CN 201110042198A CN 102134679 A CN102134679 A CN 102134679A
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Abstract
The invention discloses heat treatable overlarge-diameter high-strength steel and preparation methods thereof. The steel comprises the following components by mass percent: 0.35%-0.50% of C, 1.1%-1.9% of Si, 0.30%-0.8% of Mn, 0.30%-0.70% of Cr and the balance of Fe. The invention has two kinds of preparation processes. One preparation process comprises the following steps: heating a steel billet to directly roll according to a forming specification, quenching and tempering. The other preparation process comprises the following steps: performing hot rolling to form, reprocessing the steel in a natural environment and a cold state, reheating, quenching and tempering. By adopting the preparation processes, the consumptions of energy and raw materials can be reduced, and about 40% of raw materials can be saved while the performance requirement of the product can be met. The steel in the invention has larger diameter and ultrahigh strength, thus the steel can suffer from an ultrahigh force; and by combining the special process of the production, the steel obtained through hot rolling directly enters the subsequent production process, the semi-finished product obtained through hot rolling can not be heated again and the energy can be saved.
Description
Technical field
The present invention relates to a kind of steel and manufacture method thereof, especially, relate to a kind of thermal treatment super-large diameter High Strength Steel and manufacture method thereof.
Background technology
The present invention is should Chinese high ferro construction and to research and develop traditional steel diameter less relatively, and maximum diameter is at 16.0mm, though tensile strength is very high, overall its pulling force that can carry of calculating is still very little.And the diameter of using on the present high-speed railway is the steel of 32mm, and its tensile strength is lower again, overall calculating, and its pulling force that can carry is still very little.Therefore steel of the prior art can not satisfy the demand of engineering fully.Because parameters, the performance of traditional steel are also more bad, bring potential safety hazard in therefore just using simultaneously, also reduced working efficiency simultaneously to reality.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, in order to tackle the fast development of high-speed railway, disclose a kind of large diameter, have very high-intensity steel, improved the pulling force of the maximum that steel bear greatly, and had a very outstanding performance.
The objective of the invention is to disclose the steel that a kind of weight range of carrying improves greatly, and after satisfying certain requirement, can also dwindle the diameter of steel; When guaranteeing the steel overall performance, can also save material, also can reduce the energy and raw-material consumption significantly simultaneously.
The invention discloses a kind of many alloy ingredients obtain high strength (1750Mpa) through quench hot, average tempering major diameter steel that contain.Its intensity shows with brand-new super state with the inherent crystal grain that prolongs toughness, steel, metal metallurgical structure.The tensile strength of its finished product exists
20.0mm tool specific physical performance in the above major diameter steel, the superstrength that it had can reach between the 1400-1750Mpa; Good prolong tough performance, its section rate elongation can reach L
0100=8～15%, relative reduction in area 30～55%; Have extremely low loose property again, loose rate (when adding 70% power in advance) 2.0～5.0%/Kh is a kind of through the special machine manufacturing procedure, heats the high-strength steel of making under online mobile quenching, the tempering heat treatment process program.Can use under maximum stretching force 80% power or under the state of nature of non-extension elongation in use.
The present invention carries out research trial and obtains ideal product with the purpose of material-saving 40%.The range of application of this product promptly is a concrete construction industry Constructional Steel Bar, and it generally is used in combination with concrete, also can do anchor pole separately and use after stretch-draw.Construction industry uses it can effectively strengthen antidetonation cracking resistance, bending resistance resistance to shear, alleviates buildings weight, thereby plays firm durable, high-mechanic, the effect of high antidetonation cracking resistance.It has the kinds of surface form, as circle, thread-shaped, outside surface fin or groove, and successive or discontinuous spiral fin or groove shape.The product of circular light face series for the anchoring tension stress, no matter then the fixed length section is apart from length, all also is equipped with the nut that is meshed with it in termination district outside surface machining screw in use.Circular light Noodles product can be used in the concrete hardening post tensioning, also can insert under the concrete soft state or first pulling force or back tension use.Appearance has fin or groove, and the product that continuous or discontinuous rib and groove or external spiral line are joined the endoporus wing nut is to use in the concrete soft state is preset at the environment of setting.It is a kind of high-grade structural steel, and its optimum is used in the above concrete of C30 (resistance to compression 30mpa).
Specification of the present invention is the virtually any size specification between the radially specified size Φ 16.00mm-Φ 32.00mm of diameter or irregular circle.
The invention has the beneficial effects as follows: 1, reduced the energy and raw-material consumption, when satisfying the product performance requirement, approximately can save 40% starting material; Can see from GB that 2, the diameter of High Strength Steel is all very little, its intensity of steel that diameter is big is very little again, and this product had both had bigger diameter, also had the intensity of superelevation, integrated the power that can bear super large; 3, in conjunction with special technology in producing, the Production Flow Chart that the steel that utilize hot rolling to go out directly enter the back is avoided the work in-process after the hot rolling being reheated save energy.
Description of drawings
Fig. 1 is a kind of step of manufacturing synoptic diagram of the present invention;
Fig. 2 is an another kind of step of manufacturing synoptic diagram of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing, can implement according to this with reference to the specification sheets literal to make those skilled in the art.
The present invention utilizes the physical property of different-alloy composition, and several alloy materials are fused into one.It is matrix that the structure of its Chemical Composition adopts with iron (Fe), and control carbon (C) is to 0.35%～0.50%; Silicon (Si) 1.1%～1.9%; Manganese (Mn) 0.30%～0.8%; Chromium 0.30%～0.70%, alum (V) 0.05%～0.15%.In order to increase hardening capacity, add 0.003～0.005% boron (B) when under special conditions, melting steel.When general use or quenchant condition have satisfied intensity and toughness, then not adding " V " and " B ".According to varying strength with prolong flexible requirement and different use range, can in above-mentioned scope, adjust alloy ingredient and content.
The operational path that the present invention manufactures a product is divided into: (1) heating steel billet direct rolling and forming specification is quenched, tempering; (2) quenching of reprocessing reheat, tempering after the steel physical environment cold conditions behind the hot-roll forming.The difference of these two kinds of technologies is, whether directly enters into behind the hot rolling of steel billet to produce the stage of quenching, and first kind of technology is the stage that directly enters into quenching, and then carries out temper; Second kind of technology then be steel by naturally cooling as starting material, need carry out the heating of steel again, enter into the back again after reaching certain temperature and being incubated and quench and the tempered stage.The technology of two kinds of technologies after entering into the quenching stage is then just the same.Introduce the method for making steel of the present invention with two kinds of technologies below respectively.
As shown in Figure 1, be carbon (C) 0.35%～0.50%, silicon (Si) 1.1%～1.9%, manganese (Mn) 0.30%～0.8%, chromium (Cr) 0.30%～0.70% with component and mass percent at first, surplus is that the material of iron (Fe) is made steel billet and is hot-rolled down to strip or coil shape or the described steel billet direct heat of making rolled into required specification and size.
Then that the oxide compound on hot rolled steel billet top layer is clean through chemical treatment or mechanical treatment, this treating processes can online treatment or is being entered the production line pre-treatment.Afterwards the steel billet of described processing is entered mechanical drawing or finish rolling system with steel bar drawing finish rolling moulding.Carry out straightening processing then, and when the setting of mechanical drawing finish rolling production line parts power a little, also can not carry out straightening processing.Then work in-process are cooled in physical environment below 850 ℃.
Enter induced electricity process furnace pipeline gradient-heated step then, thereby make steel enter the complete austenitizing structural state.Because the product alloy ingredient according to different physics, mechanical property requirements is then different, therefore be heated to 850 ℃～1050 ℃ according to alloy ingredient and content design.Behind heating steel to 880 ℃～1050 ℃ temperature section, require and linear velocity need be incubated 3 meters～12 meters according to differing materials, to reach the soaking barred body, the purpose of uniform crystal particles.Heat preservation zone adopts hot-resistant heat-preserving or metallic conduit to add electric stove wire radiation insulation or the insulation of heat-resisting furnace charge, and prevents oxidation with nitrogen (N) argon gas body.Reaching maintenance rod iron top layer non-oxidation under the purpose of soaking, then be the effective ways of making excellent finished product.
Quench with tempering so that the step of last typing with regard to the work in-process that enter to described insulation below.
Quenchant can be with the high pressure water that salt hardening, iodine are quenched or temperature is lower.The main medium that quenches is a water, and water adds fashionable temperature at other media of nothing and is controlled at below 40 ℃, and high-pressure uniform cool metal appearance is quenched.Cool time be according in the linear velocity (15 meters/minute～20 meters/minute) 0.6～0.8 second with below 850 ℃～1050 ℃ the shaping specification reinforcing bar quenching to 250 ℃, quench hot was handled and was promptly come to an end this moment.The reinforcing bar feature that technology reaches is hardness HRC54 °～61 °, and the hardness deviation is not more than 4 ° between the multi-point average portion district of the core in reinforcing bar transverse section, edge part and 1/2,3/4 place and circle table portion, and the rod iron structure of this moment is a fine-grained martensitic.
After the shaping reinforcing bar is finished quenching technology, in order to eliminate fragility and, also to can be described as average tempering because of then necessary middle warm (410 ℃～550 ℃) tempering of the internal stress of austenite quenching formation.The tempering heat-eliminating medium adopts and is lower than 40 ℃ water, to reach the slow crystallization of steel, improves snappiness.Thereby final typing obtains product.
Introduce the method for utilizing second kind of technology to make steel below again.
As shown in Figure 2, be carbon (C) 0.35%～0.50%, silicon (Si) 1.1%～1.9%, manganese (Mn) 0.30%～0.8%, chromium (Cr) 0.30%～0.70% with component and mass percent at first, surplus is that the material of iron (Fe) is made steel billet and is hot-rolled down to strip or coil shape or the described steel billet direct heat of making rolled into required specification and size.
Then that the oxide compound on hot rolled steel billet top layer is clean through chemical treatment or mechanical treatment, this treating processes can online treatment or is being entered the production line pre-treatment.Afterwards the steel billet of described processing is entered mechanical drawing or finish rolling system with steel bar drawing finish rolling moulding.Carry out straightening processing then, and when the setting of mechanical drawing finish rolling production line parts power a little, also can not carry out straightening processing.After this, be exactly with first kind of quenching and tempering step that technology is the same.Promptly be: quenchant can be with the high pressure water that salt hardening, iodine are quenched or temperature is lower.The main medium that quenches is a water, and water adds fashionable temperature at other media of nothing and is controlled at below 40 ℃, and high-pressure uniform cool metal appearance is quenched.Cool time be according in the linear velocity (15 meters/minute～20 meters/minute) 0.6～0.8 second with below 850 ℃～1050 ℃ the shaping specification reinforcing bar quenching to 250 ℃, quench hot was handled and was promptly come to an end this moment.The reinforcing bar feature that technology reaches is hardness HRC54 °～61 °, and the hardness deviation is not more than 4 ° between the multi-point average portion district of the core in reinforcing bar transverse section, edge part and 1/2,3/4 place and circle table portion, and the rod iron structure of this moment is a fine-grained martensitic.After the shaping reinforcing bar is finished quenching technology, in order to eliminate fragility and, also to can be described as average tempering because of then necessary middle warm (410 ℃～550 ℃) tempering of the internal stress of austenite quenching formation.The tempering heat-eliminating medium adopts and is lower than 40 ℃ water, to reach the slow crystallization of steel, improves snappiness.Thereby final typing obtains product.
Shown in Fig. 3,4,5,6 and 7, the specification of product of the present invention is the virtually any size specification between the radial specified size Φ 16.00mm-Φ 32.00mm of diameter or irregular circle.Product type can be worn screw thread, finish rolling screw thread, Deformed Steel Bars, spiral ribs, spiral slot etc. for light face, light.
Although embodiment of the present invention are open as above, but it is not restricted to listed utilization in specification sheets and the embodiment, it can be applied to various suitable the field of the invention fully, for those skilled in the art, can easily realize other modification, therefore under the universal that does not deviate from claim and equivalency range and limited, the legend that the present invention is not limited to specific details and illustrates here and describe.
Claims (9)
1. thermal treatment super-large diameter High Strength Steel, its component and mass percent are as follows: carbon (C) 0.35%～0.50%, silicon (Si) 1.1%～1.9%, manganese (Mn) 0.30%～0.8%, chromium (Cr) 0.30%～0.70%, surplus are iron (Fe).
2. thermal treatment super-large diameter High Strength Steel according to claim 1 is characterized in that: also comprise alum (V) 0.05%～0.15% and alum boron (B) 0.003～0.005%.
3. method of making thermal treatment large-diameter and high-strength steel as claimed in claim 1, it is characterized in that: described method comprises the steps:
Step 1, be carbon (C) 0.35%～0.50%, silicon (Si) 1.1%～1.9%, manganese (Mn) 0.30%～0.8%, chromium (Cr) 0.30%～0.70% with component and mass percent, surplus is that the material of iron (Fe) is made steel billet and is hot-rolled down to strip or coil shape or the described steel billet direct heat of making rolled into required specification and size;
Step 2, the oxide compound on the steel billet top layer after the described hot rolling is clean through chemical treatment or mechanical treatment;
Thereby step 3, the steel billet of described processing is carried out mechanical drawing straightening make the work in-process that need specification;
Step 4, described work in-process are cooled in physical environment below 850 ℃;
Step 5, put in the induced electricity process furnace pipeline and carry out gradient-heated through work in-process, be heated to 850 ℃～1050 ℃ described;
Step 6, the work in-process after the described heating are incubated;
Step 7, will be through work in-process anxious quenching 850 ℃～1050 ℃ time of insulation, the water high pressure quench that quenchant is a salt hardening, iodine is quenched or temperature is lower, according to linear velocity (15 meters/minute～20 meters/minute) in 0.6～0.8 second with below 850 ℃～1050 ℃ the steel billet quenching to 250 ℃;
Step 8, with the work in-process after the quench cooled, put into induction heater and be heated to 410 ℃～550 ℃ once more and carry out tempering, adopt the water that is lower than 40 ℃ to cool off then as heat-eliminating medium, typing at last obtains product.
4. the method for manufacturing thermal treatment large-diameter and high-strength steel as claimed in claim 3, it is characterized in that: can adopt hot-resistant heat-preserving or metallic conduit to add electric stove wire radiation insulation in the described step 6 or the insulation of heat-resisting furnace charge is incubated the work in-process after the described heating, and insulation length is 3 meters-12 meters, uses simultaneously to prevent described half-finished oxidation with nitrogen argon gas body.
5. the method for manufacturing thermal treatment large-diameter and high-strength steel as claimed in claim 3 is characterized in that: in the described step 7, when the lower water high pressure quench of use temperature, the temperature of water is controlled at below 40 ℃.
6. the method for manufacturing thermal treatment large-diameter and high-strength steel as claimed in claim 3 is characterized in that the tempering heat-eliminating medium in the described step 8 can also be mineral oil.
7. method of making thermal treatment large-diameter and high-strength steel as claimed in claim 1, it is characterized in that: described method comprises the steps:
Step 1, be carbon (C) 0.35%～0.50%, silicon (Si) 1.1%～1.9%, manganese (Mn) 0.30%～0.8%, chromium (Cr) 0.30%～0.70% with component and mass percent, surplus is that the material of iron (Fe) is made steel billet and is hot-rolled down to strip or coil shape or the described steel billet direct heat of making rolled into required specification and size;
Step 2, the oxide compound on the steel billet top layer after the described hot rolling is clean through chemical treatment or mechanical treatment;
Thereby step 3, the steel billet of described processing is carried out mechanical drawing straightening make the work in-process that need specification;
Step 4, with described work in-process anxious quenching 850 ℃～1050 ℃ the time, the water high pressure quench that quenchant is a salt hardening, iodine is quenched or temperature is lower, according to linear velocity (15 meters/minute～20 meters/minute) in 0.6～0.8 second with below 850 ℃～1050 ℃ the steel billet quenching to 250 ℃;
Step 5, with the work in-process after the quench cooled, put into induction heater and be heated to 410 ℃～550 ℃ once more and carry out tempering, adopt the water that is lower than 40 ℃ to cool off then as heat-eliminating medium, typing at last obtains product.
8. the method for manufacturing thermal treatment large-diameter and high-strength steel as claimed in claim 7 is characterized in that: in the described step 4, when the lower water high pressure quench of use temperature, the temperature of water is controlled at below 40 ℃.
9. the method for manufacturing thermal treatment large-diameter and high-strength steel as claimed in claim 7 is characterized in that the tempering heat-eliminating medium in the described step 5 can also be mineral oil.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103866195A (en) * | 2012-12-14 | 2014-06-18 | 中国兵器工业第五二研究所 | Medium-carbon low-alloy boron-containing steel and heat treatment method thereof |
| CN113528943A (en) * | 2021-06-16 | 2021-10-22 | 首钢集团有限公司 | High-strength and high-toughness steel for metallurgical saw blade and preparation method thereof |
-
2011
- 2011-02-22 CN CN2011100421986A patent/CN102134679A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103866195A (en) * | 2012-12-14 | 2014-06-18 | 中国兵器工业第五二研究所 | Medium-carbon low-alloy boron-containing steel and heat treatment method thereof |
| CN113528943A (en) * | 2021-06-16 | 2021-10-22 | 首钢集团有限公司 | High-strength and high-toughness steel for metallurgical saw blade and preparation method thereof |
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Address after: 300400 Tianjin City, Beichen economic and Technological Development Zone Industrial Park Road No. 62 dual Shuangjiang Applicant after: Tianjin Silvery Dragon Prestressed Materials Co., Ltd. Address before: 300400 Tianjin City, Beichen economic and Technological Development Zone Industrial Park Road No. 62 dual Shuangjiang Applicant before: Silvery Dragon PC Steel Products Group Co., Ltd. Tianjin |
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Free format text: CORRECT: APPLICANT; FROM: SILVERY DRAGON PC STEEL PRODUCTS GROUP CO., LTD. TO: TIANJIN SILVERY DRAGON PRESTRESSED MATERIALS CO., LTD. |
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Application publication date: 20110727 |