CN100491573C - Microalloy cast steel in low carbon, and preparation method - Google Patents
Microalloy cast steel in low carbon, and preparation method Download PDFInfo
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- CN100491573C CN100491573C CNB2006101244691A CN200610124469A CN100491573C CN 100491573 C CN100491573 C CN 100491573C CN B2006101244691 A CNB2006101244691 A CN B2006101244691A CN 200610124469 A CN200610124469 A CN 200610124469A CN 100491573 C CN100491573 C CN 100491573C
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Abstract
This invention discloses a low-carbon micro-alloying cast steel, which comprises: C 0.18-0.22 wt.%, Si 0.30-0.35 wt.%, Mn 0.53-0.55 wt.%, V 0.08-0.10 wt.%, Nb 0.04-0.06 wt.%, P 0-0.023 wt.%, S 0-0.019 wt.%, rare earth metals 0.03-0.05 wt.% and Fe; or C 0.08-0.12 wt.%, Si 0.42-0.45 wt.%, Mn 0.85-0.92 wt.%, V 0.08-0.10 wt.%, Nb 0.04-0.06 wt.%, P 0-0.023 wt.%, S 0-0.019 wt.%, rare earth metals 0.03-0.05 wt.% and Fe. The low-carbon micro-alloying cast steel is produced by: casting steel by the conventional method, homogenizing at a high temperature, normalizing and aging. The low-carbon micro-alloying cast steel has excellent room-temperature strength, high 0 deg.C impact toughness, and high solderability.
Description
Technical field
The present invention relates to microalloy cast steel in low carbon and preparation method thereof, specifically, relate to low-carbon (LC)-low silicomanganese-little vanadium niobium cast steel that obtains excellent room temperature intensity and zero centigrade impelling strength and superior weldability and preparation method thereof.
Background technology
Low-carbon micro steel-alloy designs at the cooling controlling and rolling controlling process method, utilize the controlled rolling and controlled cooling thermal deformation process to cause working hardening and precipitation strength and make this processing method of the steel moulding existing so far many decades history of coming out, and be still one of main mode of present Iron and Steel Production.Yet the primary member of many industrial equipmentss need be used the cast steel manufacturing, must promptly not be by roll forming through casting promptly, so the reinforcement approach of the steel of realizing by controlled rolling and controlled cooling can't realize in cast steel.For cast steel; when requiring to guarantee higher-strength usually; also need good toughness and weldability; this just requires the carbon content of steel low, and alloying element content is few, and low carbon content and alloying element content can cause the intensity of cast steel to reduce usually; and high carbon content and alloying element content can cause the toughness of cast steel usually; particularly low-temperature impact toughness, and weldability descends, and this is the cast steel design and produces a required main difficulty that overcomes.Different with the controlled rolling and controlled cooling molding mode, past is not too paid attention to the alloying action of trace element to the composition design of cast steel, ignored simultaneously yet and selected reasonable temperature and the thermal treatment of time can effectively bring into play its strengthening effect, promptly thinking does not have the disperse strengthening effect of separating out mutually of the carbide that interaction produced that high temperature thermal deformation just can't realize that also deformation guides microalloy element and carbon.In recent years, the research and development example of microalloy cast steel is arranged also, but the research and development report that Shang Weijian takes all factors into consideration cast steel room temperature strength-good cooperation of zero centigrade toughness-carbon equivalent and reduces cost.Yet, because the usage quantity of the cast steel that requires this class performance on many industrial equipmentss (such as the intermediate of large-scale ships slow speed diesel engine seat etc.) is more and more big, because its over-all properties is higher, so present domestic suitable alternative cast steel material that still do not have, and the price of introducing external similar cast steel is very expensive, in view of the above, independent research guarantees that it is very necessary that excellent room temperature intensity-zero centigrade toughness-carbon equivalent cooperates the cast steel that also can effectively reduce cost.
Summary of the invention
The object of the present invention is to provide a kind of cast steel with low cost and preparation method thereof, gained cast steel chemical ingredients is simple, and casting and heat treatment operation are easy, and its room temperature strength, zero centigrade impelling strength and weldability are higher.
Technical scheme provided by the invention is: a kind of microalloy cast steel in low carbon, its composition are the carbon of 0.18～0.22wt%, the silicon of 0.30～0.35wt%, the manganese of 0.53～0.55wt%, the vanadium of 0.08～0.10wt%, the niobium of 0.04～0.06wt%, the phosphorus of 0～0.023wt%, the sulphur of 0～0.019wt%, the rare earth metal of 0.03～0.05wt% and the iron of surplus; Perhaps: its composition is the carbon of 0.08～0.12wt%, the silicon of 0.42～0.45wt%, the manganese of 0.85～0.92wt%, the vanadium of 0.08～0.10wt%, the niobium of 0.04～0.06wt%, the phosphorus of 0～0.023wt%, the sulphur of 0～0.019wt%, the rare earth metal of 0.03～0.05wt% and the iron of surplus.
The present invention also provides the preparation method of above-mentioned microalloy cast steel in low carbon, is the carbon of 0.18～0.22wt%, the silicon of 0.30～0.35wt%, the manganese of 0.53～0.55wt%, the vanadium of 0.08～0.10wt%, the niobium of 0.04～0.06wt%, the phosphorus of 0-0.023wt%, the sulphur of 0～0.019wt%, the rare earth metal of 0.03～0.05wt% and the iron casting moulding of surplus according to the composition of microalloy cast steel in low carbon; Then successively at 1050～1100 ℃ of thermal treatment 2.5～3.5h, air cooling, at 935～945 ℃ of thermal treatment 1～1.5h, air cooling, 380～430 ℃ of thermal treatment 3.5～4h, air cooling obtains microalloy cast steel in low carbon; Perhaps according to the composition of microalloy cast steel in low carbon be 0.08～～carbon, 0.42 of 0.12wt%～～silicon, 0.85 of 0.45wt%～～manganese, 0.08 of 0.92wt%～～vanadium, 0.04 of 0.10wt%～～sulphur, 0.03 of the niobium of 0.06wt%, the phosphorus of 0～0.023wt%, 0～0.019wt%～～rare earth metal of 0.05wt% and the iron casting moulding of surplus; Then successively at 1050～～1100 ℃ of thermal treatment 2.5～3.5h, air cooling, at 960～975 ℃ of thermal treatment 1～1.5h, air cooling, 580～610 ℃ of thermal treatment 5～6.5h, air cooling obtains microalloy cast steel in low carbon.
Technical process of the present invention and characteristics thereof:
1. alloying constituent
Cast steel of the present invention carries out the autonomous innovation optimization design according to the performance requriements of ships slow speed diesel engine support intermediate, and the guiding theory of optimizing components design is to guarantee that every mechanical property and weldability index meet or exceed the level of S17F steel (seeing Table 4); Be tending towards strengthening according to low speed high-horsepower diesel engine design, extraordinary stroke, superelevation combustion pressure and working pressure, the characteristics that thermo-efficiency and output rating improve constantly, this cast steel should have higher intensity, good impelling strength and plasticity and good weldability.Therefore, its principle of design is under the low-carbon (LC) condition, handles by the microalloying and the optimal heat of vanadium and niobium, effectively produces ferritic precipitation strength; Under the prerequisite of proof strength,, thereby can guarantee good impelling strength and weldability because carbon content is lower; An amount of silicon and manganese content help to produce solution strengthening, if its too high levels then can reduce impelling strength, the silicon in the cast steel of the present invention, manganese content are all lower, to guarantee high impelling strength and low carbon equivalent; In addition, by adding micro-mixed rare-earth elements, effectively improve the castability of cast steel and crystal grain thinning to obtain the cooperation of good strength and toughness.Cast steel of the present invention is divided into two kinds, and in the given composition range of table 1, corresponding cast steel A than high carbon content has lower silicon, manganese content, and corresponding cast steel B than low carbon content has high slightly silicon, manganese content.
2. thermal treatment process
For giving full play to the performance potential of microalloy cast steel in low carbon, it is crucial seeking the optimum treatment process scheme, to adjust tissue, obtains good comprehensive mechanical performance.Its basic mode comprises: high-temperature homogenization processing, normalizing treatment and ageing treatment.Wherein,
High-temperature homogenization is handled:
For large-scale micro-alloy low-carbon cast steel, the purpose that homogenizing is handled is in order to reduce or eliminate the casting segregation, vanadium carbide and niobium carbide that strong carbide forming element vanadium and niobium and carbon are formed can fully be dissolved in the austenite, and make alloying elements distribution and organize more even.The present invention adopts high-temperature homogenization to handle, cast steel A:1050～1100 ℃ * 2.5～3.5h, air cooling; Cast steel B:1050～1100 ℃ * 2.5～3.5h, air cooling;
Normalizing treatment:
Because above-mentioned homogenizing treatment temp is higher, soaking time is longer, grain structure is comparatively thick, in order to pass through recrystallization crystal grain thinning tissue, and vanadium and niobium trace element are more evenly distributed in austenite, normalizing has been selected lower than above-mentioned high-temperature homogenization treatment temp, but the austenitizing temperature higher than conventional normalizing treatment temperature carry out in warm austenitizing (cast steel A:935～945 ℃ * 1～1.5h; Cast steel B:960～975 ℃ * 1～1.5h), and the normalizing treatment of air cooling subsequently.
Ageing treatment:
Except that utilizing refined crystalline strengthening, the strengthening effect of microalloy cast steel in low carbon is intended embodying by ferritic precipitation strength to a great extent, because the vanadium carbide and the niobium carbide of separating out in the ferrite can be very tiny, also can obtain good impelling strength thereby both can obtain higher yield strength.Aging temperature after the normalizing and time directly influence the final performance of microalloy cast steel in low carbon, and best aging temp and best aging time are determined in test during by the gentle examination of examination progressively, cast steel A:380～430 ℃ * 3.5～4h, air cooling; Cast steel B:580～610 ℃ * 5～6.5h, air cooling.
Through the parameter of above-mentioned three kinds of thermal treatment process being optimized test, promptly selecting the optimum treatment process parameter that can make cast steel obtain high room temperature strength, high zero centigrade impelling strength, low carbon equivalent (corresponding high weldability) and low cost of alloy.
The present invention has the following advantages and positively effect:
1. the present invention provides a kind of chemical ingredients and heat-treatment technology method that can obtain the steel of excellent room temperature intensity-zero centigrade impelling strength-carbon equivalent cooperation in the little vanadium niobium of low carbon low silicon manganese cast steel for industrial application;
2. adopt alloying constituent prescription of the present invention and corresponding heat-treatment technology method thereof, can in low-carbon (LC)-low silicomanganese-little vanadium niobium cast steel of low cost and low-carbon-equivalent, obtain cooperating of excellent room temperature intensity and zero centigrade impelling strength.Specifically, the cast steel of being invented is at low-cost, low-carbon-equivalent and satisfy the high-intensity while, more meets the industry needs of outstanding zero centigrade impelling strength and high weldability.
Embodiment
Method of the present invention may further comprise the steps:
1. adopt prior art routine casting mode prepared composition scope two kinds of microalloy cast steel in low carbon of A, B as shown in table 1; Wherein RE is a rare earth metal;
2. respectively A cast steel and B cast steel are carried out omnidistance thermal treatment as shown in table 2;
3. A cast steel after omnidistance thermal treatment and B cast steel are carried out the conventional mechanical property test.
The chemical ingredients scope of two kinds of microalloy cast steel in low carbon of table 1 the present invention
The thermal treatment process parameter scope of two kinds of microalloy cast steel in low carbon of table 2 the present invention
Embodiment 1:
1. adopt prior art routine casting mode to cast to obtain the steel of the iron of the 40 lanthanums/60 cerium noriums of sulphur, 0.035wt% of phosphorus, the 0.017wt% of niobium, the 0.02wt% of vanadium, the 0.05wt% of manganese, the 0.10wt% of silicon, the 0.54wt% of carbon that composition is 0.22wt%, 0.30wt% and surplus;
2. the steel that the last step was obtained is heat-treated: successively at 1050 ℃ of thermal treatment 3h, and air cooling, at 940 ℃ of thermal treatment 1h, air cooling, 400 ℃ of thermal treatment 4h, air cooling obtains carbon equivalent C
EBe 0.33 cast steel A1 (its mechanical property is as shown in table 3).
Embodiment 2:
1. adopt prior art routine casting mode to cast to obtain the steel of the iron of the 40 lanthanums/60 cerium noriums of sulphur, 0.040wt% of phosphorus, the 0.019wt% of niobium, the 0.023wt% of vanadium, the 0.044wt% of manganese, the 0.096wt% of silicon, the 0.90wt% of carbon that composition is 0.10wt%, 0.44wt% and surplus;
2. the steel that the last step was obtained is heat-treated: successively at 1050 ℃ of thermal treatment 3.5h, and air cooling, at 970 ℃ of thermal treatment 1h, air cooling, 600 ℃ of thermal treatment 6h, air cooling obtains carbon equivalent C
EBe 0.27 cast steel B1 (its mechanical property is as shown in table 3).
The mechanical property of two kinds of microalloy cast steel in low carbon of table 3 the present invention
In the table 3, Rel-yield strength, Rm-tensile strength, A-unit elongation, Z-relative reduction in area, Akv-ballistic work, HBS-Brinell hardness
Chemical ingredients, mechanical property, cost factor and the carbon equivalent of the domestic and international some trade mark microalloy cast steel in low carbon of table 4, low-carbon and low-alloy cast steel, common low carbon cast steel and cast steel of the present invention
Marking explanation:
*: for the present invention mainly contrasts the external cast steel trade mark of reference, establishing its cost factor is 1, can be with other steel grade in contrast;
*: institute's column data is a zero centigrade notched bar impact strength of the present invention, all the other steel grades mark, be the room temperature notched bar impact strength, cast steel zero centigrade impelling strength is harsher than the requirement of room temperature impelling strength, its value is high more, show that the impelling strength under the zero centigrade temperature is good more, and its room temperature impelling strength is then better;
* *: carbon equivalent is to calculate according to general formula, and the content of carbon and alloying element is linear in it and the steel, and promptly carbon content and alloying element content are high more, and the carbon equivalent value is high more, shows that the weldability of steel is poor more; Otherwise the carbon equivalent value is low more, shows that then the weldability of steel is good more.
In addition, cast steel A1 of the present invention contains 40 lanthanums/60 cerium noriums of 0.035wt%, and cast steel B1 of the present invention contains 40 lanthanums/60 cerium noriums of 0.040wt%, and the contrast steel grade does not contain rare earth metal in the table, and the chemical ingredients surplus of all steel grades is Fe; Each mechanical performance index: Rel-yield strength, Rm-tensile strength, A-unit elongation, Z-relative reduction in area, Akv-ballistic work, HBS-Brinell hardness
Table 4 is composition, mechanical property, cost factor and the carbon equivalent of microalloy cast steel in low carbon (S17F, Q390A, 20 Γ, 1 Φ Л, 20 Φ Л), low-carbon and low-alloy cast steel (ZGD270-480, ZG30Mn, ZG20CrMo, ZG20MnMo), common low carbon cast steel (20 Γ C Л) and the microalloy cast steel in low carbon of the present invention of domestic and international some trades mark.By relatively seeing, under the prerequisite of low-alloy cost (cost factor of establishing external cast steel S17F be 1 compare) and low-carbon-equivalent (corresponding high weldability), cast steel A1 of the present invention has excellent comprehensive performances (good room temperature strength, room temperature unit elongation, room temperature relative reduction in area and zero centigrade impelling strength); Cast steel B1 has good room temperature strength and cooperates (Tu Chu zero centigrade impelling strength especially) and low especially carbon equivalent with zero centigrade impelling strength.In other words, in quite low cost and carbon equivalent and guaranteeing that cast steel A1 has high room temperature unit elongation and extra high room temperature relative reduction in area, and high zero centigrade impelling strength under the high-intensity condition; And cast steel B1 has extra high zero centigrade impelling strength and low especially carbon equivalent.
Claims (2)
1. microalloy cast steel in low carbon, it is characterized in that: being made by laxative remedy, is the carbon of 0.18～0.22wt%, the silicon of 0.30～0.35wt%, the manganese of 0.53～0.55wt%, the vanadium of 0.08～0.10wt%, the niobium of 0.04～0.06wt%, the phosphorus of 0～0.023wt%, the sulphur of 0～0.019wt%, the rare earth metal of 0.03～0.05wt% and the iron casting moulding of surplus according to the composition of microalloy cast steel in low carbon; Then successively at 1050～1100 ℃ of thermal treatment 2.5～3.5h, air cooling, obtain microalloy cast steel in low carbon at 935～945 ℃ of thermal treatment 1～1.5h, air cooling, 380～430 ℃ of thermal treatment 3.5～4h, air coolings; Perhaps the composition according to microalloy cast steel in low carbon is the carbon of 0.08～0.12wt%, the silicon of 0.42～0.45wt%, the manganese of 0.85～0.92wt%, the vanadium of 0.08～0.10wt%, the niobium of 0.04～0.06wt%, the phosphorus of 0～0.023wt%, the sulphur of 0～0.019wt%, the rare earth metal of 0.03～0.05wt% and the iron casting moulding of surplus; Then successively at 1050～1100 ℃ of thermal treatment 2.5～3.5h, air cooling, at 960～975 ℃ of thermal treatment 1～1.5h, air cooling, at 580～610 ℃ of thermal treatment 5～6.5h, air cooling obtains microalloy cast steel in low carbon.
2. the preparation method of the described microalloy cast steel in low carbon of claim 1, it is characterized in that: the composition according to microalloy cast steel in low carbon is the carbon of 0.18～0.22wt%, the silicon of 0.30～0.35wt%, the manganese of 0.53～0.55wt%, the vanadium of 0.08～0.10wt%, the niobium of 0.04～0.06wt%, the phosphorus of 0～0.023wt%, the sulphur of 0～0.019wt%, the rare earth metal of 0.03～0.05wt% and the iron casting moulding of surplus; Then successively at 1050～1100 ℃ of thermal treatment 2.5～3.5h, air cooling, obtain microalloy cast steel in low carbon at 935～945 ℃ of thermal treatment 1～1.5h, air cooling, 380～430 ℃ of thermal treatment 3.5～4h, air coolings; Perhaps the composition according to microalloy cast steel in low carbon is the carbon of 0.08～0.12wt%, the silicon of 0.42～0.45wt%, the manganese of 0.85～0.92wt%, the vanadium of 0.08～0.10wt%, the niobium of 0.04～0.06wt%, the phosphorus of 0～0.023wt%, the sulphur of 0～0.019wt%, the rare earth metal of 0.03～0.05wt% and the iron casting moulding of surplus; Then successively at 1050～1100 ℃ of thermal treatment 2.5～3.5h, air cooling, at 960～975 ℃ of thermal treatment 1～1.5h, air cooling, at 580～610 ℃ of thermal treatment 5～6.5h, air cooling obtains microalloy cast steel in low carbon.
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| CNB2006101244691A CN100491573C (en) | 2006-09-07 | 2006-09-07 | Microalloy cast steel in low carbon, and preparation method |
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| CN100491573C true CN100491573C (en) | 2009-05-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5716996B2 (en) * | 2011-05-31 | 2015-05-13 | 新東工業株式会社 | Wear resistant low alloy cast steel |
| CN102586691A (en) * | 2012-03-20 | 2012-07-18 | 三一重型装备有限公司 | Bainite cast steel and preparation method thereof |
| CN102560261B (en) * | 2012-03-23 | 2014-11-12 | 三一重型装备有限公司 | Preparation method of Bainitic steel |
| CN102586677A (en) * | 2012-03-23 | 2012-07-18 | 三一重型装备有限公司 | Low-carbon low-alloy steel and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3661537A (en) * | 1969-07-16 | 1972-05-09 | Jones & Laughlin Steel Corp | Welded pipe structure of high strength low alloy steels |
| CN1056535A (en) * | 1990-05-15 | 1991-11-27 | 鞍山钢铁公司 | A kind of steel material for rolling wheel of automobile |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3661537A (en) * | 1969-07-16 | 1972-05-09 | Jones & Laughlin Steel Corp | Welded pipe structure of high strength low alloy steels |
| CN1056535A (en) * | 1990-05-15 | 1991-11-27 | 鞍山钢铁公司 | A kind of steel material for rolling wheel of automobile |
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Effective date of registration: 20090724 Address after: Hubei city of Wuhan province Wuchang Luojiashan zip code: 430072 Co-patentee after: Yichang Marine Diesel Engine Co., Ltd. Patentee after: WuHan University Address before: Hubei city of Wuhan province Wuchang Luojiashan zip code: 430072 Patentee before: Wuhan University |