CN105220072B - Low-chromium and low-molybdenum type 2000 MPa-grade non-tempered steel plate and manufacturing method thereof - Google Patents
Low-chromium and low-molybdenum type 2000 MPa-grade non-tempered steel plate and manufacturing method thereof Download PDFInfo
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- CN105220072B CN105220072B CN201510754471.6A CN201510754471A CN105220072B CN 105220072 B CN105220072 B CN 105220072B CN 201510754471 A CN201510754471 A CN 201510754471A CN 105220072 B CN105220072 B CN 105220072B
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Abstract
The invention discloses a low-chromium and low-molybdenum type 2000 MPa-grade non-tempered steel plate and a manufacturing method thereof; the contents of chromium and molybdenum are lower; and the cost is obviously low. A double-liquid quenching process is used for fully exerting the advantages of two cooling mediums, so that the hardenability is excellent, the quenching effect is better, and the strength, the hardness and the toughness of the steel plate are prominently improved. The produced steel plate is widely applied to the manufacturing field of heavy equipment key components and special parts; the carbon equivalent is not more than 0.56%; the tensile strength is more than 2000 MPa; the elongation is more than 10%; the transverse low-temperature impact power of -40 DEG C is more than 50 J; and the surface Brinell hardness is more than 58 HBW.
Description
Technical field
The present invention relates to high-strength abrasion-proof steel plate manufacturing technology field, low molybdenum type 2000MPa of more particularly to a kind of low chromium
Level non-quenched and tempered steel plate and its manufacturer fall.
Background technology
In the last few years, in weight equipment manufacture, large-scale engineering machinery, special installation is wear-resistant, and part field starts in a large number
Using high-strength abrasion-proof steel plate, and required grade more and more higher, to this steel plate, in addition to requiring with high-strength and high-ductility,
Also need to high rigidity and good welding adaptability.And the existing high-strength steel of China is discrete enforcement with abrasion-resistant stee standard, such as state
Family's standard GB/T16270《High-strength quenched and tempered structural steel》Product hierarchy be up to Q960F, tensile strength is only 980-
1150MPa, and no wearability requires that steel plate is all with quenched（Quenching+tempering）In technique productions, and chemical composition, C, Mn contain
Amount is higher, causes carbon equivalent to increase and deteriorate welding performance.GB/T24186《Engineering machinery high-strength abrasion-proof steel plate》In, it is right
NM500 and above grade product, only lay particular emphasis on hardness number, and the leading thinking of Design of Chemical Composition are also high-carbon, high alloy, is had
There is high cost, be difficult the defect of welding.Therefore, it is work from now on to be provided simultaneously with high intensity, high tenacity, high-wearing feature, easy weldability
The pursuit index of journey machinery industry high-grade steel.
In the recent period, the country has carried out numerous studies to high-strength abrasion-proof steel, such as：Chinese patent literature CN102134680A (Shen
Number a kind of 960MPa levels super-high strength steel and its production method please 201110098008.2) be disclosed, using quenched（Quenching+tempering）
Technique productions, chemical composition is with low C（0.07-0.09%）, high Cr（1.05-1.15%）It is designed as dominating, the advantage of the steel is carbon
Equivalent is low, and welding adaptability is good, has the disadvantage high cost, and tensile strength is only up to 1120MPa, does not embody wearability and refers to
Mark.And for example：Chinese patent literature 2015101049255 discloses a kind of high elastoresistance armour plate and its manufacture method, changes
Study point with high C（0.20-0.28%）, high Cr（0.90-1.30%）, high Mo（0.20-0.40%）For mentality of designing, most high-carbon ought
Measure as 0.70%, using quenched（Quenching+tempering）Technique productions, tensile strength reach 1550-1750MPa, hardness range 480-
550HBW, the invention cost of alloy is higher and welding difficulty is larger.And for example：Chinese patent literature CN1861831A（Application number
200610051936.2）A kind of 1100MPa levels Micro Alloying high-strength steel and its production method is disclosed, is manufactured without Technology for Heating Processing
Go out the cold-strip steel that a kind of maximum pulling strength is 1260MPa, use higher C content（0.29-0.35%）It is higher
Mn contents（1.40-1.75%）, highest carbon equivalent is 0.77%, does not refer to toughness and wearability in mechanical performance index.
The content of the invention
The purpose of the present invention is aiming at above-mentioned defect and provides a kind of low chromium low molybdenum type 2000MPa level Micro Alloying
Steel plate and its manufacture method.Steel plate chromium of the present invention, molybdenum content are lower, with obvious low cost.Using double quenching technique
The advantage of two kinds of cooling mediums is given full play to, quenching degree is excellent, obtained preferable quenching effect, hence it is evident that improve steel plate strong
Degree, hardness and toughness.The steel plate of present invention production, is widely used in the manufacture field of weight equipment key member and peculiar part,
Its carbon equivalent≤0.56%, tensile strength ＞ 2000MPa, elongation percentage ＞ 10%, -40 DEG C of horizontal low-temperature impact work ＞ 50J, surface cloth
Family name hardness ＞ 580HBW.
The low molybdenum type 2000MPa level non-quenched and tempered steel plate of a kind of low chromium and its manufacture method technical scheme of the present invention is, a kind of
The low molybdenum type 2000MPa level non-quenched and tempered steel plate of low chromium, its chemical composition is by weight percentage：C：0.16～0.19%, Si：0.45
～0.50%, Mn：1.25～1.35%, P≤0.010%, S≤0.005%, Alt：0.020～0.035%, Cr：0.32～0.50%,
Mo：0.04-0.14%, remaining is Fe and inevitable impurity.
The low molybdenum type 2000MPa level non-quenched and tempered steel plate of described a kind of low chromium, it is preferred that its chemical composition is by weight percentage
For：C：0.18%, Si：0.47%, Mn：1.26%, P：0.009%, S：0.003%, Alt:0.027%, Cr：0.50%；Mo：0.14%；
Remaining is Fe and inevitable impurity.
Steel plate thickness is 6-20mm.
The manufacture method of the low molybdenum type 2000MPa level non-quenched and tempered steel plate of described a kind of low chromium, is comprised the following steps successively：KR
Molten iron pretreatment, converter or electric furnace smelting, deoxidation alloying, CAS refines, LF external refinings, RH external refinings, continuous casting, strand
Cutting, offline slow cooling more than 48 hours, inspection cleaning, heating of plate blank, Stand Mill rolling, thermal straightening, air are cooled to room temperature, determine
Chi cutting, double quenching.
Stand Mill rolling includes roughing and finish rolling, and overall compression ratio is more than 10；
Roughing：Temperature control, does not complete in three passages, and the reduction ratio of single pass is more than 45%, 4.0-5.0m/ of mill speed scope
s；
Finish rolling：Temperature control, does not complete in four-pass, and the reduction ratio of slubbing time is more than 60%, slubbing time mill speed scope 5.8
-6.5m/s。
Thermal straightening：Straightening temperature is 380-410 DEG C, and straightening force is 1800-2000t, and aligning speed is 20-25m/min, hot
Room temperature is air cooled to after aligning.
Double quenching：Glowing furnace heating-up temperature is 890-910 DEG C, and temperature retention time is 65-80min；Steel plate come out of the stove after immediately
Into First quenching press, with 10%NaCl solution as quenching medium, 450-480 DEG C is rapidly cooled to, cooling rate is more than 30 DEG C/s；
Second quenching press is entered immediately after, with water as quenching medium, room temperature is rapidly cooled to, and cooling rate is more than 25 DEG C/s.
The manufacture method of the low molybdenum type 2000MPa level non-quenched and tempered steel plate of described a kind of low chromium, the steel plate of production, for heavy type
The manufacture field of equipment key member and wear-resistant peculiar part, its carbon equivalent≤0.56%, tensile strength ＞ 2000MPa extend
Rate ＞ 10%, -40 DEG C of horizontal low-temperature impact work ＞ 50J, surface Brinell hardness ＞ 580HBW.
The low molybdenum type 2000MPa level non-quenched and tempered steel plate of a kind of low chromium and its manufacture method of the present invention has the beneficial effect that：This
Bright technical requirements and the market demand for super intensified abrasion-proof steel plate, design different from conventional components, are contained using lower chromium, molybdenum
The composition design of the expensive alloying elements such as amount and the big compression ratio high-speed rolling of two benches obtain crystal grain thinning, are quenched using biliquid after rolling
Ignition technique technology produce low cost, intensity height, good plasticity, excellent in low temperature toughness, anti abrasive tensile strength up to 2000MPa with
On high-strength abrasion-proof steel plate.Compared with prior art, the present invention one is that cost of alloy is greatly lowered；Two are quenched using biliquid
Pyrogenic process obtains full martensite, has given full play to the advantage of two kinds of cooling mediums, and quenching degree is excellent, obtains preferable quenching effect,
Significantly improve armor plate strength, hardness and toughness.
The low molybdenum type 2000MPa level non-quenched and tempered steel plate of low chromium of the present invention, carbon equivalent≤0.56%, tensile strength ＞
2000MPa, elongation percentage ＞ 10%, -40 DEG C of horizontal low-temperature impact work ＞ 50J, surface Brinell hardness ＞ 580HBW, thickness range is
6-20mm.Both there is preferable intensity, plasticity, has had good toughness and wearability again, be widely used in weight equipment key member
With the manufacture field of peculiar part.
Specific embodiment：
For a better understanding of the present invention, below with instantiation describing technical scheme in detail, but this
Invention is not limited thereto.
Embodiment 1
Low chromium low molybdenum type 2000MPa level non-quenched and tempered steel plate of the thickness for 6mm
Steel plate thickness：6mm, the melting chemical composition of steel plate is by mass percentage：C：0.16%, Si：0.46%, Mn：
1.31%, P：0.008%, S：0.001%, Alt:0.030%, Cr：0.35%；Mo：0.09%；Remaining is Fe and inevitably miscellaneous
Matter.
Prepare the concrete committed step of above-mentioned steel plate and key parameter is as follows：
Stand Mill is rolled（Roughing and finish rolling）：Overall compression ratio is 11.6, and 3 passage of roughing, every time reduction ratio are respectively
50%th, 52%, 49%, every time mill speed is respectively 4.6m/s, 4.2m/s, 4.9 m/s；Finish rolling is 3 passages, slubbing time
Reduction ratio is 70%, and slubbing time mill speed is 6.2m/s.
Thermal straightening：Straightening temperature is 385 DEG C, and straightening force is 1925t, and aligning speed is 22m/min, is air cooled to after thermal straightening
Room temperature.
Double quenching：Glowing furnace heating-up temperature is 890 DEG C, and temperature retention time is 65min.Steel plate immediately enters first after coming out of the stove
Platform quenching press, with 10%NaCl solution as quenching medium, is rapidly cooled to 480 DEG C, and cooling rate is 33 DEG C/s；The is entered immediately after
Two quenching press, with water as quenching medium, are rapidly cooled to room temperature, and cooling rate is 26 DEG C/s.
Embodiment 2
Low chromium low molybdenum type 2000MPa level non-quenched and tempered steel plate of the thickness for 10mm
Steel plate thickness：10mm, the melting chemical composition of steel plate is by mass percentage：C：0.18%, Si：0.47%, Mn：
1.26%, P：0.009%, S：0.003%, Alt:0.027%, Cr：0.50%；Mo：0.14%；Remaining is Fe and inevitably miscellaneous
Matter.
Prepare the concrete committed step of above-mentioned steel plate and key parameter is as follows：
Stand Mill is rolled（Roughing and finish rolling）：Overall compression ratio is 10.2, and 2 passage of roughing, every time reduction ratio are respectively
70%th, 65%, every time mill speed is respectively 5.0m/s, 4.4m/s；4 passage of finish rolling, the reduction ratio of slubbing time is 67%, head
Passes speed is 5.8m/s.
Thermal straightening：Straightening temperature is 410 DEG C, and straightening force is 1996t, and aligning speed is 20m/min, is air cooled to after thermal straightening
Room temperature.
Double quenching：Glowing furnace heating-up temperature is 908 DEG C, and temperature retention time is 78min.Steel plate immediately enters first after coming out of the stove
Platform quenching press, with 10%NaCl solution as quenching medium, is rapidly cooled to 455 DEG C, and cooling rate is 36 DEG C/s；The is entered immediately after
Two quenching press, with water as quenching medium, are rapidly cooled to room temperature, and cooling rate is 28 DEG C/s.
Embodiment 3
Low chromium low molybdenum type 2000MPa level non-quenched and tempered steel plate of the thickness for 20mm
Steel plate thickness：20mm, the melting chemical composition of steel plate is by mass percentage：C：0.19%, Si：0.45%, Mn：
1.26%, P：0.005%, S：0.004%, Alt:0.022%, Cr：0.42%；Mo：0.11%；Remaining is Fe and inevitably miscellaneous
Matter.
Prepare the concrete committed step of above-mentioned steel plate and key parameter is as follows：
Stand Mill is rolled（Roughing and finish rolling）：Overall compression ratio is 10.9, and 3 passage of roughing, every time reduction ratio are respectively
51%th, 49%, 47%, every time mill speed is respectively 4.1m/s, 4.6m/s, 4.8 m/s；3 passage of finish rolling, the pressure of slubbing time
Lower rate is 66%, and slubbing time mill speed is 5.9m/s.
Thermal straightening：Straightening temperature is 400 DEG C, and straightening force is 1860t, and aligning speed is 20m/min, is air cooled to after thermal straightening
Room temperature.
Double quenching：Glowing furnace heating-up temperature is 900 DEG C, and temperature retention time is 80min.Steel plate immediately enters first after coming out of the stove
Platform quenching press, with 10%NaCl solution as quenching medium, is rapidly cooled to 450 DEG C, and cooling rate is 35 DEG C/s；The is entered immediately after
Two quenching press, with water as quenching medium, are rapidly cooled to room temperature, and cooling rate is 27 DEG C/s.
The performance of the 2000MPa level non-quenched and tempered steel plates of embodiment of the present invention manufacture is as shown in table 1
Table 1
.
Carbon equivalent computing formula is CEV (%)=C+Mn/6+ (Cr+Mo+V)/5+ (Cu+Ni)/15, and surface ball hardness number is
Kept under 29420N test forces obtained by 10s-15s measure with the sintered carbide ball of 10mm.
As can be seen that using the low molybdenum type 2000MPa level non-quenched and tempered steel plate of the low chromium of 6-20mm of present invention production, with obvious
High intensity, high tenacity, high rigidity, low-carbon-equivalent.The present invention compared with prior art, improves with significant.
Claims (6)
1. the low molybdenum type 2000MPa level non-quenched and tempered steel plate of a kind of low chromium, it is characterised in that its chemical composition is by weight percentage：
C：0.16～0.19%, Si：0.45～0.50%, Mn：1.25～1.35%, P≤0.010%, S≤0.005%, Alt：0.020～
0.035%, Cr：0.32～0.50%, Mo：0.04-0.14%, remaining is Fe and inevitable impurity；
The manufacture method of the low molybdenum type 2000MPa level non-quenched and tempered steel plate of described a kind of low chromium, is comprised the following steps successively：KR molten iron
Pretreatment, converter or electric furnace smelting, deoxidation alloying, CAS refines, LF external refinings, RH external refinings, continuous casting, strand cutting,
Offline slow cooling more than 48 hours, inspection cleaning, heating of plate blank, Stand Mill rolling, thermal straightening, air are cooled to room temperature, scale and cut
Cut, double quenching；
Double quenching：Glowing furnace heating-up temperature is 890-910 DEG C, and temperature retention time is 65-80min；Steel plate is immediately entered after coming out of the stove
First quenching press, with 10%NaCl solution as quenching medium, is rapidly cooled to 450-480 DEG C, and cooling rate is more than 30 DEG C/s；Then
Second quenching press is immediately entered, with water as quenching medium, room temperature is rapidly cooled to, cooling rate is more than 25 DEG C/s.
2. a kind of low molybdenum type 2000MPa level non-quenched and tempered steel plate of low chromium according to claim 1, it is characterised in that its chemistry
Composition is by weight percentage：C：0.18%, Si：0.47%, Mn：1.26%, P：0.009%, S：0.003%, Alt:0.027%,
Cr：0.50%；Mo：0.14%；Remaining is Fe and inevitable impurity.
3. the low molybdenum type 2000MPa level non-quenched and tempered steel plate of a kind of low chromium according to claim 1, it is characterised in that steel plate is thick
Spend for 6-20mm.
4. a kind of low molybdenum type 2000MPa level non-quenched and tempered steel plate of low chromium according to claim 1, it is characterised in that Stand Mill
Rolling includes roughing and finish rolling, and overall compression ratio is more than 10；
Roughing：Temperature control, does not complete in three passages, and the reduction ratio of single pass is more than 45%, 4.0-5.0m/s of mill speed scope；
Finish rolling：Temperature control, does not complete in four-pass, and the reduction ratio of slubbing time is more than 60%, and slubbing time mill speed scope 5.8-
6.5m/s。
5. a kind of low molybdenum type 2000MPa level non-quenched and tempered steel plate of low chromium according to claim 4, it is characterised in that thermal straightening：
Straightening temperature is 380-410 DEG C, and straightening force is 1800-2000t, and aligning speed is 20-25m/min, is air cooled to room after thermal straightening
Temperature.
6. the low molybdenum type 2000MPa level non-quenched and tempered steel plate of a kind of low chromium according to claim 5, it is characterised in that production
Steel plate, for the manufacture field of weight equipment key member and wear-resistant peculiar part, its carbon equivalent≤0.56%, tensile strength
＞ 2000MPa, elongation percentage ＞ 10%, -40 DEG C of horizontal low-temperature impact work ＞ 50J, surface Brinell hardness ＞ 580HBW.
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| CN201510754471.6A CN105220072B (en) | 2015-11-09 | 2015-11-09 | Low-chromium and low-molybdenum type 2000 MPa-grade non-tempered steel plate and manufacturing method thereof |
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| CN201510754471.6A CN105220072B (en) | 2015-11-09 | 2015-11-09 | Low-chromium and low-molybdenum type 2000 MPa-grade non-tempered steel plate and manufacturing method thereof |
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| CN105220072B true CN105220072B (en) | 2017-03-22 |
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| JP2006206967A (en) * | 2005-01-28 | 2006-08-10 | Sumitomo Metal Ind Ltd | Method for continuously casting free-cutting steel for machine structure |
| KR101125404B1 (en) * | 2007-10-29 | 2012-03-27 | 신닛뽄세이테쯔 카부시키카이샤 | Martensite type non-heat treated steel for hot forging and hot forging non-heat treated steel part |
| CN101613831B (en) * | 2008-06-27 | 2011-05-11 | 宝山钢铁股份有限公司 | Non-hardened and non-tempered high-hardness hot rolled steel, manufacturing method thereof and application thereof |
| JP5447778B2 (en) * | 2009-01-29 | 2014-03-19 | Ｊｆｅスチール株式会社 | Non-tempered low-yield ratio high-tensile steel plate and method for producing the same |
| JP5842358B2 (en) * | 2010-10-12 | 2016-01-13 | Ｊｆｅスチール株式会社 | Non-tempered low yield ratio high tensile steel plate and method |
| CN102703826A (en) * | 2012-06-13 | 2012-10-03 | 安徽工业大学 | Ti-B-R compound micro-alloying high-tenacity bending die steel and preparation method thereof |
| CN102925804A (en) * | 2012-11-01 | 2013-02-13 | 湖南华菱湘潭钢铁有限公司 | Method for producing ultrahigh strength steel plate |
| JP5842942B2 (en) * | 2014-02-03 | 2016-01-13 | Ｊｆｅスチール株式会社 | Alloyed hot-dip galvanized steel sheet with excellent plating adhesion and method for producing the same |
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