CN104805378B - A kind of high tough Ultra-low carbon medium managese steel cut deal and preparation method thereof - Google Patents
A kind of high tough Ultra-low carbon medium managese steel cut deal and preparation method thereof Download PDFInfo
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- CN104805378B CN104805378B CN201510241664.1A CN201510241664A CN104805378B CN 104805378 B CN104805378 B CN 104805378B CN 201510241664 A CN201510241664 A CN 201510241664A CN 104805378 B CN104805378 B CN 104805378B
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Abstract
The present invention provides a kind of high tough Ultra-low carbon medium managese steel cut deal and preparation method thereof.Described cut deal its chemical composition by weight percentage is: C:0.02 ~ 0.06%, Mn:3.00 ~ 8.00%, Si:0.10 ~ 0.50%, S:＜ 0.01%, P:＜ 0.01%, Al:0.01 ~ 0.05%, Cu:0.02 ~ 0.30%, Ni:0.02 ~ 0.30%, Mo:0.02 ~ 0.20%, Cr:0.02 ~ 0.40%, surplus is Fe and other inevitable impurity.Present invention also offers the preparation method of described cut deal, use the alloy blank of above-mentioned chemical composition proportioning through hot rolling process and temper, obtaining yield strength is 690 ~ 750 MPa, tensile strength is 780 ~ 850 MPa, elongation percentage is the Ultra-low carbon medium managese steel cut deal that the height of 26 ~ 35%, 60 DEG C of ballistic work ＞ 100 J is tough.Additionally, the inventive method operating process is simple, easily realize industrialized production.
Description
Technical field
The invention belongs to cut deal and manufacture field, be specifically related to a kind of high tough Ultra-low carbon medium managese steel cut deal and preparation method thereof.
Background technology
Store abundant undeveloped oil-gas resource around ocean, marine resources development seems and becomes more and more important.Current explored world ocean oil, gas reserves 80 more than % in the region, deep-sea of the depth of water 500 below m, wherein Arctic has about 90,000,000,000 barrels of crude oil reserves and more than the gas reserves of 47 tcms.As Kind of Steels Used in Engineering Structures, offshore platform steel is ensureing that marine facility secure context plays of paramount importance effect, owing to the exploitation of petroleum resources develops towards arctic regions, deep-sea, therefore determine offshore platform steel and must have the performance indications of high intensity and high tenacity, this is for ensureing operator's life security, improves offshore platform steel service life and exploitation marine resources are significant.
In order to improve safety and the mobility of offshore platform steel, the use ratio of high strength steel increases year by year.Such as, in self-elevating drilling platform, high-strength steel accounts for 55 ~ 60 %, and in semisubmersible drilling platform, high-strength steel accounts for 90 ~ 97.5 %, and spud leg therein, cantilever beam and rackwork etc. need 460 ~ 690 MPa ranks and 690 MPa higher level other high intensity special-purpose steel.Along with the rising of armor plate strength rank, middle carbon content is generally >=0.10% so that steel plate needs to carry out weld preheating and after welding treatment when welding, and technique is more complicated, not only makes subsequent use cost up, wastes mass energy.Additionally, the tensile strength from main iron company of Japan such as JFE, Nippon Steel and Sumitomo Metal Industries and the exploitation of the company such as Di Lingen, Sweden SSAB is 360 ~ 980
From the point of view of the composition design of the offshore platform steel plate of MPa, 690 MPa level offshore platform steels are both needed to use the noble metal alloys such as Cr, Mo, Ni, in order to ensure the low-temperature flexibility of steel plate, even need to add the Ni element of nearly 4%, production cost is high, and frequently with multistage Q-tempering technique, operation is complex.
Summary of the invention
The various problems existed for prior art, the present invention provides a kind of high tough Ultra-low carbon medium managese steel cut deal and preparation method thereof.The technical scheme of this method is:
A kind of high tough Ultra-low carbon medium managese steel cut deal, its chemical composition by weight percentage is: C:0.02 ~ 0.06%, Mn:3.00 ~ 8.00%, Si:0.10 ~ 0.50%, S:＜ 0.01%, P:＜ 0.01%, Al:0.01 ~ 0.05%, Cu:0.02 ~ 0.30%, Ni:0.02 ~ 0.30%, Mo:0.02 ~ 0.20%, Cr:0.02 ~ 0.40%, surplus is Fe and other inevitable impurity；
Described cut deal is organized as tempered martensite and small stable adverse transformation austenite.
Described ga(u)ge of plate is 20 ~ 50 mm, and yield strength is 690 ~ 750 MPa, and tensile strength is 780 ~ 850 MPa, and elongation percentage is 26 ~ 35 % ,-60 DEG C of ballistic work ＞ 100 J.
The preparation method of a kind of high tough Ultra-low carbon medium managese steel cut deal, comprises the following steps that:
(1) hot rolling processes
Alloy blank is heated to 1000 ~ 1200 DEG C with stove and is incubated 3 h, alloy blank chemical composition by weight percentage is: C:0.02 ~ 0.06%, Mn:3.00 ~ 8.00%, Si:0.10 ~ 0.50%, S:＜ 0.01%, P:＜ 0.01%, Al:0.01 ~ 0.05%, Cu:0.02 ~ 0.30%, Ni:0.02 ~ 0.30%, Mo:0.02 ~ 0.20%, Cr:0.02 ~ 0.40%, surplus is Fe and other inevitable impurity；Then passing through 9 passages and be rolled into the thick hot rolled plate of 20 ~ 50 mm, start rolling temperature and finishing temperature are respectively 950 ~ 1000 DEG C and 880 ~ 930 DEG C, hot rolling terminate after with the cooldown rate water-cooled of 10 ~ 25 DEG C/s to room temperature, the cut deal after being quenched；
(2)
Temper
After heating furnace is warming up to 635 ~ 695 DEG C, the cut deal after quenching being put into and is incubated 50 ~ 100 min, air cooling is to room temperature subsequently, obtains high tough Ultra-low carbon medium managese steel cut deal.
Beneficial effects of the present invention: the inventive method uses ferritic-austenitic two-phase section tempering process to the steel plate after quenching, adverse transformation austenite can be formed, it is effectively increased the toughness and tenacity of steel plate, prepared Ultra-low carbon medium managese steel cut deal yield strength is 690 ~ 750 MPa, tensile strength is 780 ~ 850 MPa, elongation percentage is 26 ~ 35% ,-60 DEG C of ballistic work ＞ 100 J；Additionally, the inventive method operating process is simple, easily realize industrialized production.
Accompanying drawing explanation
Fig. 1 is the process schematic representation of preparation method of the present invention；
Fig. 2 is the metallographic structure of the high tough Ultra-low carbon medium managese steel cut deal of embodiment 1；
Fig. 3 is the SEM pattern tissue of the high tough Ultra-low carbon medium managese steel cut deal of embodiment 1.
Detailed description of the invention
Φ 450 hot-rolling mill that the hot-rolling mill that the present invention implements to use is Northeastern University's rolling technique and National Key Laboratory of tandem rolling automatization manufactures and designs；
It is high temperature box type resistance furnace that hot rolling of the present invention processes the heating furnace used, and model is RX4-85-13B；
The heating furnace that temper of the present invention uses is chamber type electric resistance furnace, and model is RX-36-10.
Embodiment
1
Prepare the Ultra-low carbon medium managese steel cut deal that height that thickness is 30mm is tough,Processing step is as follows:
(1) hot rolling processes
Alloy blank is heated to 1200 DEG C with stove and is incubated 3 h, alloy blank chemical composition by weight percentage is: C:0.045%, Mn:5.50%, Si:0.20%, S:0.002%, P:0.003%, Al:0.02%, Cu:0.20%, Ni:0.30%, Mo:0.20%, Cr:0.30%, surplus is Fe and other inevitable impurity；Then passing through 9 passages and be rolled into the thick hot rolled plate of 30mm, start rolling temperature and finishing temperature are respectively 960 DEG C and 890 DEG C, hot rolling terminate after with the cooldown rate water-cooled of 15 DEG C/s to room temperature, the cut deal after being quenched；
(2)
Temper
After heating furnace is warming up to 650 DEG C, being put into and be incubated 80min by the cut deal after quenching, air cooling is to room temperature subsequently, obtains the Ultra-low carbon medium managese steel cut deal that height that thickness is 30mm is tough.
Thickness is that the tough Ultra-low carbon medium managese steel cut deal of the height of 30mm is organized as tempered martensite and small stable adverse transformation austenite, and yield strength is 710 MPa, and tensile strength is 805 MPa, and elongation after fracture is 34%, and-60 DEG C of ballistic works are 175 J.
Embodiment
2
Prepare the Ultra-low carbon medium managese steel cut deal that height that thickness is 20mm is tough,Processing step is as follows:
(1) hot rolling processes
Alloy blank is heated to 1000 DEG C with stove and is incubated 3 h, alloy blank chemical composition by weight percentage is: C:0.02%, Mn:8.00%, Si:0.10%, S:0.002%, P:0.003%, Al:0.05%, Cu:0.30%, Ni:0.25%, Mo:0.18%, Cr:0.02%, surplus is Fe and other inevitable impurity；Then passing through 9 passages and be rolled into the thick cut deal of 20 mm, start rolling temperature and finishing temperature are 950 DEG C and 880 DEG C respectively, with the cooldown rate water-cooled of 25 DEG C/s to room temperature after hot rolling；Microscopic structure after rolling and quenching is martensite；
(2)
Temper
After heating furnace is warming up to 635 DEG C, the steel plate after rolling and quenching is put into insulation 100
Min, air cooling is to room temperature subsequently, obtains the Ultra-low carbon medium managese steel cut deal that height that thickness is 20mm is tough.
Thickness is that the tough Ultra-low carbon medium managese steel cut deal of the height of 20mm is organized as tempered martensite and small stable adverse transformation austenite, and yield strength is 750
MPa, tensile strength is 850 MPa, and elongation after fracture is 26
% ,-60
DEG C ballistic work is 154 J.
Embodiment
3
Prepare the Ultra-low carbon medium managese steel cut deal that height that thickness is 50mm is tough,Processing step is as follows:
(1) hot rolling processes
Alloy blank is heated to 1100 DEG C with stove and is incubated 3 h, alloy blank chemical composition by weight percentage is: C:0.06%, Mn:3.00%, Si:0.50%, S:0.002%, P:0.003%, Al:0.01%, Cu:0.02%, Ni:0.02%, Mo:0.02%, Cr:0.40%, surplus is Fe and other inevitable impurity；Then passing through 9 passages and be rolled into the thick cut deal of 50 mm, start rolling temperature and finishing temperature are 1000 DEG C and 930 DEG C respectively, with the cooldown rate water-cooled of 10 DEG C/s to room temperature after hot rolling；Microscopic structure after rolling and quenching is martensite；
(2)
Temper
After heating furnace is warming up to 695 DEG C, the steel plate after rolling and quenching is put into insulation 50
Min, air cooling is to room temperature subsequently.Obtain the Ultra-low carbon medium managese steel cut deal that height that thickness is 50mm is tough.
Thickness is that the tough Ultra-low carbon medium managese steel cut deal of the height of 50mm is organized as tempered martensite and small stable adverse transformation austenite, and yield strength is 690 MPa, and tensile strength is 780 MPa, and elongation after fracture is 35%, and-60 DEG C of ballistic works are 178 J.
Claims (2)
1. one kind high tough Ultra-low carbon medium managese steel cut deal, it is characterised in that described cut deal chemical composition by weight percentage
For: C:0.02～0.045%, Mn:3.00～5.50%, Si:0.10～0.20%, S:＜ 0.01%, P:＜ 0.01%, Al:
0.01～0.02%, Cu:0.02～0.30%, Ni:0.02～0.30%, Mo:0.18～0.20%, Cr:0.02～0.40%, surplus
For Fe and other inevitable impurity；It is organized as tempered martensite and small stable adverse transformation austenite；Thickness is 20～50
Mm, yield strength is 690～750MPa, and tensile strength is 780～850MPa, and elongation percentage is 26～35% ,-60 DEG C of ballistic works
＞ 100J.
2. the preparation method of a kind of high tough Ultra-low carbon medium managese steel cut deal described in claim 1, it is characterised in that include with
Lower processing step:
(1) hot rolling processes
With stove, alloy blank being heated to 1000～1200 DEG C and is incubated 3h, alloy blank chemical composition by weight percentage is:
C:0.02～0.06%, Mn:3.00～8.00%, Si:0.10～0.50%, S:＜ 0.01%, P:＜ 0.01%, Al:0.01～0.05%,
Cu:0.02～0.30%, Ni:0.02～0.30%, Mo:0.02～0.20%, Cr:0.02～0.40%, surplus be Fe and other not
Evitable impurity；Then pass through 9 passages and be rolled into 20～50mm thick hot rolled plates, start rolling temperature and finishing temperature respectively
950～1000 DEG C and 880～930 DEG C, hot rolling terminate after with the cooldown rate water-cooled of 10～25 DEG C/s to room temperature, after being quenched
Cut deal；
(2) temper
After heating furnace is warming up to 635～695 DEG C, putting into and be incubated 50～100min by the cut deal after quenching, air cooling is to room temperature subsequently.
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| CN105648314B (en) * | 2016-01-22 | 2017-07-11 | 东北大学 | ‑80℃AkvThe preparation method of medium managese steel plate of the value more than 100J |
| CN105755371B (en) * | 2016-03-31 | 2017-07-28 | 南京钢铁股份有限公司 | Manganese low-temperature steel and preparation method thereof in a kind of high-strength low-yield ratio without nickel |
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| CN106868425B (en) * | 2017-03-16 | 2018-03-27 | 东北大学 | The post weld heat treatment method of the high tough cut deal welding point low-temperature impact toughness of Mn in a kind of low C of improvement 690MPa levels |
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| CN109957731B (en) * | 2017-12-14 | 2020-09-01 | 鞍钢股份有限公司 | High-manganese medium-thickness steel plate for ocean engineering and production method thereof |
| CN108385037B (en) * | 2018-03-23 | 2020-05-19 | 东北大学 | Ti microalloyed medium manganese steel medium plate for ocean platform and preparation method thereof |
| CN108660395B (en) * | 2018-05-30 | 2019-12-06 | 东北大学 | 690 MPa-grade low-carbon medium-manganese high-strength medium plate |
| CN110714173A (en) * | 2019-07-25 | 2020-01-21 | 东莞材料基因高等理工研究院 | Low-carbon medium manganese steel medium plate containing epsilon martensite and preparation method thereof |
| CN112899584A (en) * | 2021-01-15 | 2021-06-04 | 南京钢铁股份有限公司 | Ultralow temperature L-shaped steel and manufacturing method thereof |
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