CN105734414A - Medium-carbon non-quenched and tempered steel and production method thereof - Google Patents
Medium-carbon non-quenched and tempered steel and production method thereof Download PDFInfo
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- CN105734414A CN105734414A CN201610092744.XA CN201610092744A CN105734414A CN 105734414 A CN105734414 A CN 105734414A CN 201610092744 A CN201610092744 A CN 201610092744A CN 105734414 A CN105734414 A CN 105734414A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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Abstract
The invention discloses medium-carbon non-quenched and tempered steel and a production method thereof. The production method comprises the smelting process, the continuous casting process, the rolling process and the heat treatment process; in the smelting process, tapping molten steel is composed of, by weight, 0.22-0.29% of C, 0.70-1.00% of Mn, 0.17-0.37% of Si, 0.02-0.1% of V, 0.015-0.2% of Ti, 0.02-0.15% of Nb, 0.005-0.05% of Al, S smaller than or equal to 0.035%, P smaller than or equal to 0.035% and the balance Fe and inevitable impurities; in the rolling process, the soaking temperature of steel billets in a heating furnace ranges from 1150 DEG C to 1250 DEG C, the initial rolling temperature ranges from 1020 DEG C to 1200 DEG C, the secondary initial rolling temperature ranges from 850 DEG C to 950 DEG C, the finish rolling temperature ranges from 750 DEG C to 850 DEG C, and the cooling speed of rolled metal ranges from 5 DEG C/s to 15 DEG C/s. According to the medium-carbon non-quenched and tempered steel, the quenching and tempering heat treatment technology is not needed, hot-rolled structures are composed of ferrite and perlite structures, have good tensile strength and low temperature impact toughness and can be produced without the quenching and tempering treatment, the machining cost can be effectively lowered for users, the energy can be saved, the production efficiency can be improved, and the environment can be improved.
Description
Technical field
The present invention relates to a kind of non-hardened and tempered steel and production method, especially a kind of middle carbon non-hardened and tempered steel for core plate of lorry and production method thereof.
Background technology
Domestic application is in relevant industries carryings such as machinery manufacturing industry, for instance the body center plate of railway freight-car load bearing component and center bearing, mostly adopts carbon structural steels.Carbon structural steels needs modifier treatment in process of production, causes its production cost higher, and modifier treatment is easily generated the defects such as deformation, cracking, decarburization.
Non-hardened and tempered steel is a kind of novel energy-conserving green structure steel material saving modifier treatment, its performance and price are better than traditional structural steel, it is used for substituting quenched and tempered steel, have the saving energy, material combination property better, shorten the advantages such as production cycle, it is possible to reduce environmental pollution, avoid oxidation, decarburization, deformation, cracking.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of middle carbon non-hardened and tempered steel with better tensile strength and low-temperature impact toughness；Present invention also offers the production method of a kind of middle carbon non-hardened and tempered steel.
For solving above-mentioned technical problem, the weight percentage of present component is: C0.22～0.29%, Mn0.70～1.00%, Si0.17～0.37%, V0.02～0.1%, Ti0.015～0.2%, Nb0.02～0.15%, Al0.005～0.05%, S≤0.035%, P≤0.035%, and surplus is Fe and inevitable impurity.
The reason of design of alloy of the present invention is as follows:
Carbon: for ensureing the quenching degree of steel, improving the intensity of steel, the composition range of carbon is 0.22～0.29%.
Manganese: improve intensity and the toughness of steel.Mn has stronger solid solution strengthening effect, it is possible to decrease the phase transition temperature of steel, slows down austenite from being transformed into perlite speed, improves quenching degree；And can crystal grain thinning, improve intensity and toughness.But carrying high Mn content and will improve the volume fraction of pearlite, reduce the toughness of steel, for ensureing good obdurability, manganese composition range is 0.70～1.0%.
Silicon: Si solid solubility in steel is relatively big, the notable reinforced ferrite of energy, plays solid solution strengthening effect higher than Mn；The increase of Si can ferrite volume fraction in motion height steel, and make grain refinement, be conducive to improving toughness；Silicon composition range is 0.17～0.37%.
Niobium, vanadium, titanium: main and C, N formation compound, tiny X(C, N in steel) in the operation of rolling, stop Austenite Grain Growth, crystal grain thinning, produce to strengthen effect significantly.V can improve quenching degree simultaneously.
The inventive method includes smelting procedure, continuous casting working procedure, rolling process and heat treatment step；In described smelting procedure tapping molten steel, the weight percentage of composition is described above；
Described rolling process: steel billet is 1150～1250 DEG C in the soaking temperature of heating furnace, start rolling temperature 1020～1200 DEG C；Secondary start rolling temperature 850～950 DEG C, finishing temperature 750～850 DEG C；Cooling velocity after rolling is 5～15 DEG C/s.
Heat treatment step described in the inventive method: stocking is 730～900 DEG C in the soaking temperature of heat-treatment furnace, and the rate of heat addition is 4～10mm/min.In described heat treatment step, temperature retention time is 20～40min.
Adopt and have the beneficial effects that produced by technique scheme: the present invention is without quenching-and-tempering process, hot rolling microstructure is ferrite+pearlitic structrure, there is good tensile strength and low-temperature impact toughness, can produce without modifier treatment, can effectively reduce the processing cost of user, save the energy, improve production efficiency, improve environment.
The quenching-and-tempering processes such as the inventive method does not carry out quenching after forge hot, tempering, directly use, and production cycle relatively hardening and tempering process produces to have and significantly shortens, and manufacturing cost decreases, and has significant market prospect；Simultaneously product has excellent tensile strength, low-temperature impact toughness and fatigue resistance；Product mechanical property: ReL >=265N/mm2、Rm≥490N/mm2、A≥19%、AKU2≥90J.Raw the inventive method can significantly reduce the processing cost of user, saves part heat treatment step, saves the energy, reduces and pollutes；Product has the advantages that high intensity, high/low temperature are moulding, can be used for producing the tool for up-down cartridge of railway freight-car.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is the metallograph of the present invention.
Detailed description of the invention
In this, the production method of carbon non-hardened and tempered steel includes smelting procedure, continuous casting working procedure, rolling process and heat treatment step；The production technology of each operation is as described below:
(1) smelting procedure: include following process, converter smelting → deoxidation of molten steel alloying → slag-stopping tapping → interpolation Nb, V microalloy → LF refine → ladle argon-blown soft blow → refine tapping.Converter adopts desulphurised hot metal to smelt, and single slag process highcasting speed is tapped, and improves the degree of purity of molten steel, and converter terminal carbon controls 0.22～0.25%, and temperature controls at 1650～1670 DEG C.Slag-stopping tapping, top of the slag thickness 50～70mm.
Converter tapping process adds deoxidizer-carry out molten steel final deoxidizing, adopts silicomangan to carry out alloying, less than Mn part ferromanganese polishing, be subsequently adding ferro-niobium, VN alloy carries out alloying.
LF stove refining section process utilizes aluminum shot or carbide to carry out top of the slag deoxidation, after furnishing divides inlet wire, adds ferrotianium; then according to the amount feeding aluminum calcium line of 1～1.5m/ ton steel; soft blow argon flow amount is according to 50NL/min control, and the time ensures 8～15min, it is ensured that large inclusions floats.In refining process, in tapping molten steel, the weight percentage of composition is: C0.22～0.29%, Mn0.70～1.00%, Si0.17～0.37%, V0.02～0.1%, Ti0.015～0.2%, Nb0.02～0.15%, Al0.005～0.05%, S≤0.035%, P≤0.035%, surplus is Fe and inevitable impurity.
(2) continuous casting working procedure: adopting whole process protection casting, tundish adopts basic powder；Continuous casting billet adopt retarded cooling process, 48 hours slow cooling time and more than, obtain 250*2100mm section slab (steel billet).
(3) rolling process: steel billet is 1150～1250 DEG C in the soaking temperature of heating furnace, start rolling temperature 1020～1200 DEG C；Secondary start rolling temperature 850～950 DEG C, finishing temperature 750～850 DEG C；Cooling down after rolling, the rate of cooling of stocking is 5～15 DEG C/s；Ensure finally to be organized as ferrite+pearlitic structrure.
(4) heat treatment step: stocking is 4～10mm/min in the heat-treatment furnace rate of heat addition, soaking temperature is 730～900 DEG C, and insulation (soaking) time is 20～40min, and air slow cooling after insulation can obtain described middle carbon non-hardened and tempered steel.
Embodiment 1: the composition proportion of carbon non-hardened and tempered steel and concrete production technology are as described below in this.
The weight proportion of carbon non-hardened and tempered steel composition in this: C0.23%, Mn0.94%, Si0.20%, V0.04%, Ti0.017%, Nb0.023%, Al0.023%, S0.013%, P0.015%, surplus is Fe and inevitable impurity.
The production technology of carbon non-hardened and tempered steel in this: (1) smelting procedure: in converter steelmaking process, aim carbon controls 0.23%, and temperature controls at 1660 DEG C；The top of the slag thickness of slag-stopping tapping is 62mm；In LF refining process, the aluminum calcium line of feeding 1.3m/ ton steel, the argon 11min of soft blow flow 50NL/min.
(2) continuous casting working procedure: 48 hours continuous casting billet slow cooling time, obtain 250*2100mm steel billet.
(3) rolling process: steel billet is 1200 DEG C in the soaking temperature of heating furnace, start rolling temperature 1100 DEG C；Secondary start rolling temperature 900 DEG C, finishing temperature 790 DEG C；Cooling down after rolling, the rate of cooling of stocking is 12 DEG C/s.
(4) heat treatment step: stocking heats to soaking temperature 820 DEG C with the speed of 5mm/min in heat-treatment furnace, is incubated 30min, air slow cooling after insulation, can obtain described middle carbon non-hardened and tempered steel.
The metallograph (50 μm) of described middle carbon non-hardened and tempered steel is shown in Fig. 1, and as seen from Figure 1, it is organized as ferrite+pearlite；Its mechanical property is: ReL365N/mm2, Rm534N/mm2, A23%, AKU2134J, 129J, 114J.
Embodiment 2: the composition proportion of carbon non-hardened and tempered steel and concrete production technology are as described below in this.
The weight proportion of carbon non-hardened and tempered steel composition in this: C0.22%, Mn0.83%, Si0.17%, V0.06%, Ti0.2%, Nb0.09%, Al0.05%, S0.026%, P0.035%, surplus is Fe and inevitable impurity.
The production technology of carbon non-hardened and tempered steel in this: (1) smelting procedure: in converter steelmaking process, aim carbon controls 0.25%, and temperature controls at 1665 DEG C；The top of the slag thickness of slag-stopping tapping is 70mm；In LF refining process, the aluminum calcium line of feeding 1.2m/ ton steel, the argon 13min of soft blow flow 50NL/min.
(2) continuous casting working procedure: 60 hours continuous casting billet slow cooling time, obtain 250*2100mm steel billet.
(3) rolling process: steel billet is 1220 DEG C in the soaking temperature of heating furnace, start rolling temperature 1150 DEG C；Secondary start rolling temperature 920 DEG C, finishing temperature 800 DEG C；Cooling down after rolling, the rate of cooling of stocking is 8 DEG C/s.
(4) heat treatment step: stocking heats to soaking temperature 900 DEG C with the speed of 8mm/min in heat-treatment furnace, is incubated 35min, air slow cooling after insulation, can obtain described middle carbon non-hardened and tempered steel.
The mechanical property of described middle carbon non-hardened and tempered steel is: ReL378N/mm2, Rm545N/mm2, A24%, AKU2154J, 132J, 133J.
Embodiment 3: the composition proportion of carbon non-hardened and tempered steel and concrete production technology are as described below in this.
The weight proportion of carbon non-hardened and tempered steel composition in this: C0.26%, Mn0.70%, Si0.30%, V0.02%, Ti0.11%, Nb0.15%, Al0.036%, S0.035%, P0.022%, surplus is Fe and inevitable impurity.
The production technology of carbon non-hardened and tempered steel in this: (1) smelting procedure: in converter steelmaking process, aim carbon controls 0.24%, and temperature controls at 1650 DEG C；The top of the slag thickness of slag-stopping tapping is 57mm；In LF refining process, the aluminum calcium line of feeding 1.0m/ ton steel, the argon 10min of soft blow flow 50NL/min.
(2) continuous casting working procedure: 50 hours continuous casting billet slow cooling time, obtain 250*2100mm steel billet.
(3) rolling process: steel billet is 1150 DEG C in the soaking temperature of heating furnace, start rolling temperature 1020 DEG C；Secondary start rolling temperature 870 DEG C, finishing temperature 750 DEG C；Cooling down after rolling, the rate of cooling of stocking is 10 DEG C/s.
(4) heat treatment step: stocking heats to soaking temperature 770 DEG C with the speed of 4mm/min in heat-treatment furnace, is incubated 40min, air slow cooling after insulation, can obtain described middle carbon non-hardened and tempered steel.
The mechanical property of described middle carbon non-hardened and tempered steel is: ReL369N/mm2, Rm541N/mm2, A23%, AKU2151J, 121J, 141J.
Embodiment 4: the composition proportion of carbon non-hardened and tempered steel and concrete production technology are as described below in this.
The weight proportion of carbon non-hardened and tempered steel composition in this: C0.28%, Mn1.00%, Si0.37%, V0.08%, Ti0.015%, Nb0.12%, Al0.005%, S0.018%, P0.016%, surplus is Fe and inevitable impurity.
The production technology of carbon non-hardened and tempered steel in this: (1) smelting procedure: in converter steelmaking process, aim carbon controls 0.22%, and temperature controls at 1655 DEG C；The top of the slag thickness of slag-stopping tapping is 50mm；In LF refining process, the aluminum calcium line of feeding 1.25m/ ton steel, the argon 8min of soft blow flow 50NL/min.
(2) continuous casting working procedure: 55 hours continuous casting billet slow cooling time, obtain 250*2100mm steel billet.
(3) rolling process: steel billet is 1250 DEG C in the soaking temperature of heating furnace, start rolling temperature 1200 DEG C；Secondary start rolling temperature 950 DEG C, finishing temperature 850 DEG C；Cooling down after rolling, the rate of cooling of stocking is 5 DEG C/s.
(4) heat treatment step: stocking heats to soaking temperature 860 DEG C with the speed of 10mm/min in heat-treatment furnace, is incubated 20min, air slow cooling after insulation, can obtain described middle carbon non-hardened and tempered steel.
The mechanical property of described middle carbon non-hardened and tempered steel is: ReL381N/mm2, Rm533N/mm2, A24.5%, AKU2145J, 153J, 142J.
Embodiment 5: the composition proportion of carbon non-hardened and tempered steel and concrete production technology are as described below in this.
The weight proportion of carbon non-hardened and tempered steel composition in this: C0.29%, Mn0.78%, Si0.32%, V0.10%, Ti0.16%, Nb0.02%, Al0.045%, S0.024%, P0.026%, surplus is Fe and inevitable impurity.
The production technology of carbon non-hardened and tempered steel in this: (1) smelting procedure: in converter steelmaking process, aim carbon controls 0.24%, and temperature controls at 1670 DEG C；The top of the slag thickness of slag-stopping tapping is 60mm；In LF refining process, the aluminum calcium line of feeding 1.5m/ ton steel, the argon 15min of soft blow flow 50NL/min.
(2) continuous casting working procedure: 52 hours continuous casting billet slow cooling time, obtain 250*2100mm steel billet.
(3) rolling process: steel billet is 1180 DEG C in the soaking temperature of heating furnace, start rolling temperature 1090 DEG C；Secondary start rolling temperature 850 DEG C, finishing temperature 760 DEG C；Cooling down after rolling, the rate of cooling of stocking is 15 DEG C/s.
(4) heat treatment step: stocking heats to soaking temperature 730 DEG C with the speed of 7mm/min in heat-treatment furnace, is incubated 25min, air slow cooling after insulation, can obtain described middle carbon non-hardened and tempered steel.
The mechanical property of described middle carbon non-hardened and tempered steel is: ReL364N/mm2, Rm539N/mm2, A24%, AKU2135J, 130J, 115J.
Claims (4)
1. carbon non-hardened and tempered steel in a kind, it is characterized in that, the weight percentage of its composition is: C0.22～0.29%, Mn0.70～1.00%, Si0.17～0.37%, V0.02～0.1%, Ti0.015～0.2%, Nb0.02～0.15%, Al0.005～0.05%, S≤0.035%, P≤0.035%, and surplus is Fe and inevitable impurity.
2. the production method of carbon non-hardened and tempered steel in a kind, it is characterised in that: it includes smelting procedure, continuous casting working procedure, rolling process and heat treatment step；In described smelting procedure tapping molten steel, the weight percentage of composition is: C0.22～0.29%, Mn0.70～1.00%, Si0.17～0.37%, V0.02～0.1%, Ti0.015～0.2%, Nb0.02～0.15%, Al0.005～0.05%, S≤0.035%, P≤0.035%, surplus is Fe and inevitable impurity；
Described rolling process: steel billet is 1150～1250 DEG C in the soaking temperature of heating furnace, start rolling temperature 1020～1200 DEG C；Secondary start rolling temperature 850～950 DEG C, finishing temperature 750～850 DEG C；Cooling velocity after rolling is 5～15 DEG C/s.
3. the production method of a kind of middle carbon non-hardened and tempered steel according to claim 2, it is characterised in that described heat treatment step: stocking is 730～900 DEG C in the soaking temperature of heat-treatment furnace, and the rate of heat addition is 4～10mm/min.
4. the production method of a kind of middle carbon non-hardened and tempered steel according to claim 3, it is characterised in that: in described heat treatment step, temperature retention time is 20～40min.
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Cited By (5)
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| CN108251744A (en) * | 2018-01-11 | 2018-07-06 | 唐山钢铁集团有限责任公司 | A kind of Micro Alloying railway freight-car body center plate steel and its production method |
| CN109457097A (en) * | 2018-12-11 | 2019-03-12 | 唐山中厚板材有限公司 | A kind of production method of think gauge high-strength steel plate |
| CN109837461A (en) * | 2019-02-15 | 2019-06-04 | 江苏利淮钢铁有限公司 | A kind of the water jacket non-hardened and tempered steel and its manufacturing method of new-energy automobile |
| CN111304516A (en) * | 2020-03-05 | 2020-06-19 | 中天钢铁集团有限公司 | Non-quenched and tempered steel for high-strength high-low-temperature impact toughness lifting hook and production process |
| CN112080688A (en) * | 2020-08-11 | 2020-12-15 | 江苏联峰实业有限公司 | Medium-carbon niobium-vanadium-titanium composite reinforced non-quenched and tempered steel and production method thereof |
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| CN108251744A (en) * | 2018-01-11 | 2018-07-06 | 唐山钢铁集团有限责任公司 | A kind of Micro Alloying railway freight-car body center plate steel and its production method |
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| CN109837461A (en) * | 2019-02-15 | 2019-06-04 | 江苏利淮钢铁有限公司 | A kind of the water jacket non-hardened and tempered steel and its manufacturing method of new-energy automobile |
| CN111304516A (en) * | 2020-03-05 | 2020-06-19 | 中天钢铁集团有限公司 | Non-quenched and tempered steel for high-strength high-low-temperature impact toughness lifting hook and production process |
| CN112080688A (en) * | 2020-08-11 | 2020-12-15 | 江苏联峰实业有限公司 | Medium-carbon niobium-vanadium-titanium composite reinforced non-quenched and tempered steel and production method thereof |
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