CN101302601A - High-strength tough large-cross section non-quenched and tempered steel rod and preparation thereof - Google Patents
High-strength tough large-cross section non-quenched and tempered steel rod and preparation thereof Download PDFInfo
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- CN101302601A CN101302601A CNA2008100400259A CN200810040025A CN101302601A CN 101302601 A CN101302601 A CN 101302601A CN A2008100400259 A CNA2008100400259 A CN A2008100400259A CN 200810040025 A CN200810040025 A CN 200810040025A CN 101302601 A CN101302601 A CN 101302601A
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Abstract
The invention relates to a novel high strength-toughness large-section non-quenched-tempered steel bar and a method for preparing the same, belonging to the non-quenched-tempered low-alloy steel manufacturing process technical field. The chemical compositions in percentage by weight of the non-quenched and tempered steel low-alloy steel are: 0.1 to 0.3 percent of C, 0.3 to 1.5 percent of Si, 1.5 to 2.5 percent of Mn, 0.5 to 1.5 percent of Cr, 0.2 to 0.3 percent of Mo, 0.05 to 0.15 percent of V, 0.01 to 0.05 percent of Ti, less than 0.01 percent of S, less than or equal to 0.015 percent of P, less than or equal to 0.019 percent of N, and the balance being Fe. The preparation method comprises the following steps that: after materials are weighed and dispensed according to the formula, steel materials are melted by adopting the prior melting method; an obtained steel ingot or blank is heated to be at a temperature of between 1100 and 1300 DEG C, has heat preserved for long enough, is forged or rolled when the temperature is between 1100 and 1150 DEG C so as to ensure that the deformation ratio of the steel ingot or blank is more than 3; when the forging stop or rolling stop temperature is between 800 and 950 DEG C, the steel ingot or the blank is forged or rolled into a steel bar with a certain diameter; and the steel bar is conventionally air-cooled to room temperature and then receives low temperature tempering at a temperature of below 200 DEG C for 2 hours, so as to obtain the high strength-toughness steel bar finally.
Description
Technical field
The present invention relates to a kind of novel high-strength tough large-cross section non-hardened and tempered steel rod iron and preparation method thereof, belong to non-modified low alloy steel manufacturing process technology field.
Background technology
In recent years along with the fast development of automobile industry, being growing more intense of its market competition, requirement to the vehicle structure part is also more and more higher, and traditional quenched and tempered state structural part material has drawbacks such as complex process, energy consumption height and heat treating fault, so non-tempering process has become an important breakthrough mouth that improves the automobile market competitive power in the use of automobile in structural part production.
Under this background, the research and development of high-strong toughness non-hardened and tempered steel more and more has been subjected to extensive concern, and also obtained certain achievement in succession, reported that yield strength and tensile strength after 300～650 ℃ of tempering of this steel air cooling can reach 660～810MPa, 700～1000MPa respectively among the Chinese publication CN1058997 of picture " Unhardened and untempered low carbon steel with high strength and toughness "; And employing spray up n. and isothermal forging process have been reported among the Chinese patent publication number CN1472358 " a kind of non-tempered superhigh carbon steel and production technique thereof ", the yield strength of steel and tensile strength can reach 850～910MPa respectively, 1150～1220MPa, unit elongation is within 9.5～11% scopes; In addition, the intensity of having reported this steel among the Chinese patent publication number CN1861831 " high-strength non-hardened and non-tempered steel of 1100MPa level and production method thereof " can reach the suitable level with Chinese patent publication number CN1472358 " a kind of high carbon steel and production technique thereof ", and unit elongation has reached 10～12%, and has adopted external refining and cold rolling technology.
Summary of the invention
The purpose of this invention is to provide and develop a kind of non-hardened and tempered steel steel grade, and provide a kind of non-hardened and tempered steel rod iron goods with and preparation method thereof.
So-called non-hardened and tempered steel, it be forge or rolling finishing after do not need to quench and the steel of temper, it has simplified the production technique of steel, provides cost savings.And so-called quenched and tempered steel be forge or rolling after to quench and temper after the steel that could use.
A kind of novel high-strength tough large-cross section of the present invention non-hardened and tempered steel rod iron is characterized in that this rod iron has following chemical ingredients and weight percent thereof:
C?0.1～0.3％，Si?0.3～1.5％，Mn?1.5～2.5％，
Cr?0.5～1.5％，Mo?0.2～0.3％，V?0.05～0.15％，
Ti?0.01～0.05％，S＜0.01％，P≤0.015％，
N≤0.018%, the Fe surplus.
A kind of novel high-strength tough large-cross section of the present invention non-hardened and tempered steel rod iron and preparation method thereof is characterized in that having following technological process and step:
A. at first by above-mentioned non-hardened and tempered steel steel material component prescription weighing and burden, adopt traditional melting method then, the steel material is carried out melting;
B. with gained steel ingot or blank heating to 1100～1300 ℃, and be incubated the sufficiently long time; Begin forging or rolling in the time of 1100～1150 ℃, make its deformation ratio greater than 3, finish-forging or finishing temperature are 800～950 ℃, and forging rolling becomes the rod iron of certain diameter size;
C. above-mentioned rod iron is carried out conventional air cooling, be cooled to room temperature after, carry out 200 ℃ of low-temperaturetemperings that temperature is following 2 hours again; Finally promptly obtain high-strong toughness non-hardened and tempered steel rod iron.
The purposes of the non-hardened and tempered steel rod iron that the inventive method makes is to be best suited for parts such as making automobile axle part, injection moulding machine connecting rod.
Characteristics of the present invention and advantage are as described below:
(1) chemical ingredients of non-hardened and tempered steel of the present invention and prescription aspect, on the basis that utilizes alloy elements such as manganese, chromium, reduce the carbon content of steel, add a spot of molybdenum, add micro alloying element, do not need to add expensive nickel and the unmanageable boron of composition.
(2) forge or rolling after can be in very wide cooling still can obtain good obdurability in the velocity band, do not need special refining and controlled rolling and controlled cooling skill.
(3) in the end the stage is adopted 200 ℃ of low-temperaturetemperings that temperature is following 2 hours, and its mechanical property is further enhanced.
Embodiment
After now specific embodiments of the invention being described in.
Embodiment 1
The chemical ingredients and the weight percent thereof of non-hardened and tempered steel are as follows in this practical example:
C?0.14％，Si?0.818％，Mn?2.08％，Cr?1.109％，
V?0.123％，Ti?0.036％，Mo?0.29％，S＜0.05％，
P 0.0111%, the Fe surplus.
The preparation method of non-hardened and tempered steel rod iron, its process and step are as follows:
(1) at first by above-mentioned non-hardened and tempered steel steel material component prescription weighing and burden, adopts traditional melting method then, the steel material is carried out melting;
(2) with the blank heating to 1200 of gained ℃, be incubated after 3 hours, rolling 1150 ℃ of beginnings, its deformation ratio is 3～3.5, and finishing temperature is 900 ℃, rolls the rod iron that causes φ 80mm and two kinds of sizes of φ 600mm respectively, and carries out conventional air cooling;
(3) behind the cool to room temperature, carry out 200 ℃ of low-temperaturetemperings that temperature is following 2 hours again; Finally promptly obtain high-strong toughness non-hardened and tempered steel rod iron.This rod iron specimen coding is No. 1, grade of steel.
Embodiment 2
The chemical ingredients and the weight percent thereof of non-hardened and tempered steel are as follows in this practical example:
C?0.189％，Si?0.56％，Mn?2.12％，Cr?1.075％，
V?0.149％，Ti?0.04％，Mo?0.29％，S＜0.0024％，
P 0.0083%, the Fe surplus.
The preparation method of non-hardened and tempered steel rod iron, its process and step are as follows:
(1) at first by above-mentioned non-hardened and tempered steel steel material component prescription weighing and burden, adopts traditional melting method then, the steel material is carried out melting;
(2) with the blank heating to 1200 of gained ℃, be incubated after 3 hours, rolling 1150 ℃ of beginnings, its deformation ratio is 3～3.5, and finishing temperature is 900 ℃, rolls the rod iron that causes φ 80mm and two kinds of sizes of φ 600mm respectively, and carries out conventional air cooling;
(3) behind the cool to room temperature, carry out 200 ℃ of low-temperaturetemperings that temperature is following 2 hours again; Finally promptly obtain high-strong toughness non-hardened and tempered steel rod iron.This rod iron specimen coding is No. 2, grade of steel.
Sample is in the Mechanics Performance Testing of air cooling attitude and tempering attitude
The φ 80mm of embodiment sample grade of steel 1 and grade of steel 2 and the rod iron of φ 600mm are done Mechanics Performance Testing in air cooling attitude and tempering attitude respectively, and its test result sees the following form 1.
The mechanical property table of table 1 test rod iron
As can be seen from Table 1, φ 80mm steel of the present invention is not needing under the tempered situation a
kCan reach 82J/cm
2, Rp
0.2Can reach 813MPa, Rm can reach 1243MPa, and Ae can reach 48.6%, and Z can reach 15%, and after 200 ℃ * 2 hours low-temperaturetemperings, every index all improves.
Contrast as can be seen from the φ 80mm bar and the φ 600mm bar mechanical property of air cooling attitude, plasticity index differs about one percentage point, and intensity index differs in the 50MPa, and toughness index differs 18J/cm
2In; As a whole, φ 600mm bar center toughness is high level cadre φ 80mm bar slightly, the lower slightly dried φ 800mm bar of heart portion intensity.
In the last table, the meaning of each symbol is as follows:
a
kImpelling strength
Rp
0.2Yield strength
Rm tensile strength
The Ae relative reduction in area
The Z unit elongation
Air cooling not during tempering φ 600mm rod iron cross section hardness (HRC) as shown in table 2 below:
Table 2 air cooling is tempering φ 600mm rod iron cross section hardness not
Table 2 as can be seen, the edge hardness of air cooling φ 600mm and the gap of centre hardness illustrate still have good uniformity of hardness when the present invention reaches φ 600mm in 2HRC.
Claims (3)
1. novel high-strength tough large-cross section non-hardened and tempered steel rod iron is characterized in that this rod iron has following chemical ingredients and weight percent thereof:
C?0.1～0.3％，Si?0.3～1.5％，Mn?1.5～2.5％，
Cr?0.5～1.5％，Mo?0.2～0.3％，V?0.05～0.15％，
Ti?0.01～0.05％，S＜0.01％，P≤0.015％，
N≤0.018%, the Fe surplus.
2. novel high-strength tough large-cross section non-hardened and tempered steel rod iron and preparation method thereof is characterized in that having following technological process and step:
A. at first by above-mentioned non-hardened and tempered steel steel material component prescription weighing and burden, adopt traditional melting method then, the steel material is carried out melting;
B. with gained steel ingot or blank heating to 1100～1300 ℃, and be incubated the sufficiently long time; Begin forging or rolling in the time of 1100～1150 ℃, make its deformation ratio greater than 3, finish-forging or finishing temperature are 800～950 ℃, and forging rolling becomes the rod iron of certain diameter size;
C. above-mentioned rod iron is carried out conventional air cooling, be cooled to room temperature after, carry out 200 ℃ of low-temperaturetemperings that temperature is following 2 hours again; Finally promptly obtain high-strong toughness non-hardened and tempered steel rod iron.
3. the purposes of a novel high-strength tough large-cross section non-hardened and tempered steel rod iron, this rod iron are applicable to the parts of making automobile axle part, injection moulding machine connecting rod.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008100400259A CN101302601A (en) | 2008-07-01 | 2008-07-01 | High-strength tough large-cross section non-quenched and tempered steel rod and preparation thereof |
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|---|---|---|---|
| CNA2008100400259A CN101302601A (en) | 2008-07-01 | 2008-07-01 | High-strength tough large-cross section non-quenched and tempered steel rod and preparation thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102839319A (en) * | 2011-06-24 | 2012-12-26 | 宝山钢铁股份有限公司 | 1,100 MPa-grade high strength steel and production method thereof |
| CN103469115A (en) * | 2013-08-07 | 2013-12-25 | 安徽蓝博旺机械集团合诚机械有限公司 | Fork-lift truck steering knuckle cast steel material and preparation method thereof |
| CN105018698A (en) * | 2015-07-24 | 2015-11-04 | 江苏龙城精锻有限公司 | Medium-carbon non-tempered steel post-forging temperature controlling and cooling method |
| CN105803171A (en) * | 2016-05-13 | 2016-07-27 | 无锡宝露重工有限公司 | Heat treatment process for low-alloy high-strength structural steel forge piece after forging |
| CN108950390A (en) * | 2018-07-12 | 2018-12-07 | 贵州捷盛钻具股份有限公司 | A kind of high-strength and high ductility round steel and the preparation method and application thereof |
| CN109022697A (en) * | 2018-09-21 | 2018-12-18 | 江西樟树市兴隆特殊钢有限公司 | A kind of Micro Alloying mould steel and preparation method thereof |
| CN109759779A (en) * | 2017-11-09 | 2019-05-17 | 苏州苏信特钢有限公司 | A kind of non-hardened and tempered steel motor shaft and its processing method |
| CN112275972A (en) * | 2020-09-09 | 2021-01-29 | 广州锻造一厂股份有限公司 | Cylindrical body steel forging method |
-
2008
- 2008-07-01 CN CNA2008100400259A patent/CN101302601A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102839319A (en) * | 2011-06-24 | 2012-12-26 | 宝山钢铁股份有限公司 | 1,100 MPa-grade high strength steel and production method thereof |
| CN102839319B (en) * | 2011-06-24 | 2014-12-10 | 宝钢特钢有限公司 | 1,100 MPa-grade high strength steel and production method thereof |
| CN103469115A (en) * | 2013-08-07 | 2013-12-25 | 安徽蓝博旺机械集团合诚机械有限公司 | Fork-lift truck steering knuckle cast steel material and preparation method thereof |
| CN103469115B (en) * | 2013-08-07 | 2016-01-06 | 安徽蓝博旺机械集团合诚机械有限公司 | Fork-truck steering saves cast steel material and preparation method thereof |
| CN105018698A (en) * | 2015-07-24 | 2015-11-04 | 江苏龙城精锻有限公司 | Medium-carbon non-tempered steel post-forging temperature controlling and cooling method |
| CN105803171A (en) * | 2016-05-13 | 2016-07-27 | 无锡宝露重工有限公司 | Heat treatment process for low-alloy high-strength structural steel forge piece after forging |
| CN109759779A (en) * | 2017-11-09 | 2019-05-17 | 苏州苏信特钢有限公司 | A kind of non-hardened and tempered steel motor shaft and its processing method |
| CN108950390A (en) * | 2018-07-12 | 2018-12-07 | 贵州捷盛钻具股份有限公司 | A kind of high-strength and high ductility round steel and the preparation method and application thereof |
| CN109022697A (en) * | 2018-09-21 | 2018-12-18 | 江西樟树市兴隆特殊钢有限公司 | A kind of Micro Alloying mould steel and preparation method thereof |
| CN112275972A (en) * | 2020-09-09 | 2021-01-29 | 广州锻造一厂股份有限公司 | Cylindrical body steel forging method |
| CN112275972B (en) * | 2020-09-09 | 2022-04-19 | 广州锻造一厂股份有限公司 | Cylindrical body steel forging method |
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Open date: 20081112 |