CN106906426B - A kind of high tenacity high corrosion resistant type weather-resistant steel plate and its manufacturing method - Google Patents

A kind of high tenacity high corrosion resistant type weather-resistant steel plate and its manufacturing method Download PDF

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CN106906426B
CN106906426B CN201710169452.6A CN201710169452A CN106906426B CN 106906426 B CN106906426 B CN 106906426B CN 201710169452 A CN201710169452 A CN 201710169452A CN 106906426 B CN106906426 B CN 106906426B
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steel plate
temperature
corrosion resistant
type weather
control
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CN106906426A (en
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胡学文
张建
王海波
何博
饶添荣
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Magang Group Holding Co Ltd
Maanshan Iron and Steel Co Ltd
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Magang Group Holding Co Ltd
Maanshan Iron and Steel Co Ltd
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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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/064—Dephosphorising; Desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • 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
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • 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
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • 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
    • 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
    • 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
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The present invention relates to a kind of high tenacity high corrosion resistant type weather-resistant steel plate, chemical component weight percentage composition is C :≤0.03%；Si :≤0.10%；Mn:0.10~0.50%；P :≤0.015%；S :≤0.005%；Nb:0.030~0.050%；Ti:0.020~0.050%；Cr:4.0~6.0%；Ni:0.40~0.60%；Cu:0.40~0.60%；Al:0.020~0.060%；Surplus is Fe and is inevitably mingled with；It by molten iron pretreatment, converter smelting, refining, continuous casting, hot continuous rolling, section cooling, batches, can guarantee the steady production of steel plate.Steel plate yield strength produced is 480~550MPa, and tensile strength is 600~700MPa, elongation percentage 24-30%, and at a temperature of -80 DEG C, steel plate charpy V impact energy is greater than 100J.

Description

A kind of high tenacity high corrosion resistant type weather-resistant steel plate and its manufacturing method
Technical field
The present invention relates to weathering steel manufacturing fields, and in particular to a kind of high tenacity high corrosion resistant type high-strength weather-proof steel plate and its Manufacturing method.
Background technique
The elements such as phosphorus, copper, chromium, nickel are added in weather-proof Steel material, surface forms the fine and close and strong protective film of adhesion, hinders Corrosion inward spread and develop, protect rusty scale under matrix, slow down its corrosion rate, apply container railway, rail truck, On the steel construction that bridge, pylon, harbour building etc. are exposed to the atmosphere for a long time, there is good atmospheric corrosion resistance.With The development such as the structural members such as container, rail truck, pylon ever-increasing long-life, heavy duty, special-shaped structure piece forming, welding It is required that weathering steel material technology also develops to high anti-corrosion, high-strength, high tenacity, the easily directions such as welding.
The patent that high corrosion resistant type weathering steel and its manufacturing method are declared has multinomial.Such as: patent CN 102409253A is public Opened a kind of high-corrosion-resisting, high strength rail truck weathering steel and its manufacturing method, chemical component be C:0.015~ 0.065%；Si:0.1~0.50%；Mn:0.20~0.60%；P≤0.015；S≤0.008；Cu:0.20~0.60；Ni: 0.12~1.0；Cr:2.15~4.0；Nb:0.005~0.05%；Ti:0.01~0.08%；Al:0.01~0.05%；Surplus For Fe and inevitably it is mingled with.It is heated using 1200-1260 DEG C of slab, 880-950 DEG C of finishing temperature, two sections is used after rolling Section cooling mode and 560~660 DEG C of coiling temperature productions, yield strength >=550MPa, tensile strength >=650MPa, -40 DEG C Charpy V impact energy=65-98J.Patent CN 10212717A disclose a kind of good-toughness the anti-corrosion weathering steel containing Cr of height and Its manufacturing method, chemical component are C:0.01~0.06%；Si:0.1~0.4%；Mn:0.2~0.8%；P≤0.01；S≤ 0.006；Cu:0.2~0.5；Ni:0.2~1.2；Cr:2.5~7.0；Ti:0.01~0.1%；Al:0.01~0.05%；N :≤ 0.005%；Surplus is Fe and is inevitably mingled with.It is heated using 1200-1250 DEG C of slab, 800-900 DEG C of finishing temperature, volume Take 550~650 DEG C of temperature, yield strength >=460MPa, anti-40 DEG C of charpy V impact energy >=60J.Patent CN 101376953A Disclose a kind of high-corrosion resistant high-strength weather resisting steel and its manufacturing method, chemical component C:0.002~0.005%；Si:0.20~ 0.40%；Mn:0.01~0.05%；P≤0.020；S≤0.008；Cu:0.20~0.40；Ni :≤0.40；Cr:4.50~ 5.50；Ca:0.001~0.006%；N:0.001~0.006；Ti :≤0.03%；Al:0.01~0.05%；；Surplus be Fe and Inevitably it is mingled with, is heated using >=1200 DEG C of slabs, using the cooling rate of 5-8 DEG C/S, 600~650 DEG C of coiling temperature, Yield strength >=700MPa belongs to a kind of weathering steel of high intensity high corrosion resistance, but does not provide impact flexibility index.Patent CN 103074548A discloses a kind of high-corrosion-resisting, high strength weather-resistant steel plate containing Al and its manufacturing method, and chemical component C:0.02~ 0.07%；Si:0.20~1.0%；Mn:0.2~2.2%；P≤0.01%；S≤0.006%；Cu:0.2~0.5%；Ni: 0.2-1.2%；Cr:0.5~3.5%；Al:0.4~4.0%；N :≤0.005；V:0.02-0.10%；And Al/Cr is 0.5- 8.0；Surplus is Fe and is inevitably mingled with, and is heated using >=1220 DEG C of slabs, 720-800 DEG C of finishing temperature, using 10-40 DEG C/cooling rate of S, charpy V impact energy under the conditions of 460~520 DEG C of coiling temperature, yield strength 350-500MPa, -40 DEG C In 60J or more.
The above patent be not directed to -80 DEG C of temperature charpy V impact energies in 100J or more high tenacity high corrosion resistant type weathering steel and Its manufacturing method.
Summary of the invention
For the above prior art problem, the purpose of the present invention is develop a kind of high tenacity high corrosion resistant type weathering steel steel plate. This steel plate is produced by smelting chemical ingredient and technique appropriate, have high corrosion resisting property, good cold formability energy, Good welding performance has good impact flexibility under the conditions of -80 DEG C of temperature.This steel plate is suitable for long-life rail truck Structural member, cold forming special-shaped structure piece and extremely cold climatological region atmospheric corrosion resistance structural member manufacture etc..Specific technical solution is as follows:
A kind of high tenacity high corrosion resistant type weather-resistant steel plate, chemical component weight percentage composition are C :≤0.03%；Si :≤ 0.10%；Mn:0.10~0.50%；P :≤0.015%；S :≤0.005%；Nb:0.030~0.050%；Ti:0.020~ 0.050%；Cr:4.0~6.0%；Ni:0.40~0.60%；Cu:0.40~0.60%；Al:0.020~0.060%；Surplus For Fe and inevitably it is mingled with；
Further, a kind of high tenacity high corrosion resistant type weather-resistant steel plate of the invention, metallographic structure are polygonal ferrite list Phase fine grained texture, ferrite grain size are 12~13 grades；
High tenacity high corrosion resistant type weather-resistant steel plate manufacturing method of the present invention includes the following steps: molten iron pretreatment, converter smelting Refining, continuous casting, hot continuous rolling, section cooling, is batched at refining, it is characterised in that:
1) molten iron pretreatment desulfurizing control [S]≤0.0050%；Refining using RH vacuum outgas and LF furnace carry out it is above-mentioned at Sub-control system, N content≤60ppm in steel, H content≤2ppm；
2) for packet liquidus temperature at 10~30 DEG C, and using wick-containing slighter compress, control slab center C class is inclined in continuous casting control Analysis is less than 1.5 grades；
3) by the molten steel smelted with the chemical component in step (1), it is casting continuously to form the slab with a thickness of 230mm or 250mm, with Upper slab, which is reheated, can enter furnace using cold charge, can also enter furnace using hot charging；
4) slab heats 3~4 hours in heating furnace, controls slab tapping temperature at 1150~1200 DEG C, then in heat Continuous mill train carries out roughing and finish rolling, and finish rolling start rolling temperature controls≤1030 DEG C, and finishing temperature control is at 800~860 DEG C；
5) steel plate controls coiler plate after cooling using continuous section cooling, control cooling velocity≤20 DEG C after finish rolling Temperature is at 580~640 DEG C.
Further, high tenacity high corrosion resistant type weather-resistant steel plate manufacturing method of the present invention, the hot rolled coil of hot tandem production It naturally cools to crosscutting at scale steel plate after uncoiling, aligning after room temperature.
Compared with prior art, the present invention high tenacity high corrosion resistant type weather-resistant steel plate of the present invention has the following advantages that and effect:
1) steel plate produced using chemical component of the invention, technique and specific method, yield strength 480-550MPa, Tensile strength is 600-700MPa, elongation percentage=24-30%.
2) there is excellent low-temperature flexibility using steel plate produced by the invention, at a temperature of -80 DEG C, the impact of steel plate Charpy V-type Function is greater than 100J (impact specimen size: 5 × 10 × 55mm).
3) there is excellent atmospheric corrosion resistance using steel plate produced by the invention.It is pair with ordinary carbon steel Q345B Than sample, the period soaking corrosion for carrying out 72 hours with weathering steel alternate-immersion test method (TB/T2375-93) by railway is rotten Erosion experiment, relatively corrosive rate≤28%.
4) there is good welding performance and cold formability energy using steel plate produced by the invention, is suitable for using welding Or the modes such as rolling formation or bending and forming manufacture atmospheric corrosion resistance structural member.
Detailed description of the invention
Fig. 1 is product metallographic structure figure
Specific embodiment
Below according to attached drawing, the present invention will be described in detail, is that one of numerous embodiments of the present invention are preferred real Apply example.
Use steel plate metallographic structure produced by the invention for the single-phase fine grained texture of shape changeable ferrite, ferrite grain size 12 ~13 grades.Typical metallographic structure pattern is shown in Fig. 1.
Selecting chemical component steel shown in table 1 is raw material, and continuous casting steel billet is having a size of 230mm or 250mm.By slab by adding Then hot stove heating is rolled through hot tandem, cooled down and is batched.Control heating temperature, finishing temperature, section cooling speed Degree and coiling temperature.Embodiment chemical component is shown in Table 1, and embodiment rolling and cooling technique are shown in Table 2, and embodiment mechanical property is shown in Table 3, embodiment series of temperatures ballistic work is shown in Table 4, and embodiment atmospheric corrosion resistance test result is shown in Table 5.
1 embodiment of table surveys chemical component (mass percent, wt%, surplus Fe)
Number C Si Mn P S Al Nb Ti Cr Cu Ni
S1 0.010 0.10 0.45 0.012 0.004 0.025 0.040 0.020 4.8 0.44 0.43
S2 0.020 0.08 0.25 0.010 0.003 0.020 0.035 0.015 4.2 0.43 0.45
S3 0.015 0.05 0.38 0.008 0.002 0.030 0.042 0.035 5.2 0.42 0.43
The rolling of 2 embodiment of table and cooling technique parameter
3 embodiment mechanical property of table
4 embodiment impact property of table
5 embodiment atmospheric corrosion resistance test result of table
The present invention is exemplarily described above in conjunction with attached drawing, it is clear that the present invention implements not by aforesaid way Limitation, as long as using the various improvement that the inventive concept and technical scheme of the present invention carry out, or not improved direct application It is within the scope of the present invention in other occasions.

Claims (2)

1. a kind of high tenacity high corrosion resistant type weather-resistant steel plate, chemical component weight percentage composition is C :≤0.03%；Si :≤ 0.10%；Mn:0.10~0.50%；P :≤0.015%；S :≤0.005%；Nb:0.030~0.050%；Ti:0.020~ 0.050%；Cr:4.0~6.0%；Ni:0.40~0.60%；Cu:0.40~0.60%；Al:0.020~0.060%；Surplus For Fe and inevitably it is mingled with, the high tenacity high corrosion resistant type weather-resistant steel plate, metallographic structure is that polygonal ferrite is single-phase thin Crystalline substance tissue, ferrite grain size are 12~13 grades；At a temperature of -80 DEG C, steel plate charpy V impact energy is greater than 100J；
The high tenacity high corrosion resistant type weather-resistant steel plate manufacturing method, include the following steps: molten iron pretreatment, converter smelting, refining, Continuous casting, section cooling, batches hot continuous rolling, it is characterised in that:
1) molten iron pretreatment desulfurizing control [S]≤0.0050%；Refining carries out mentioned component control using RH vacuum outgas and LF furnace It makes, N content≤60ppm in steel, H content≤2ppm；
2) by the molten steel smelted with the chemical component in step (1), the slab with a thickness of 230mm or 250mm, the casting are casting continuously to form Base, which is reheated, can enter furnace using cold charge, can also enter furnace using hot charging；Continuous casting control in packet liquidus temperature at 10~30 DEG C, And wick-containing slighter compress is used, control slab center C class segregation is less than 1.5 grades；
3) slab heats 3~4 hours in heating furnace, controls slab tapping temperature at 1150~1200 DEG C, then in hot continuous rolling Unit carries out roughing and finish rolling, and finish rolling start rolling temperature controls≤1030 DEG C, and finishing temperature control is at 800~860 DEG C；
4) steel plate controls coiler plate temperature after cooling using continuous section cooling, control cooling velocity≤20 DEG C after finish rolling At 580~640 DEG C.
2. high tenacity high corrosion resistant type weather-resistant steel plate as described in claim 1, the hot rolled coil of the hot tandem production is certainly It is so cooled to crosscutting at scale steel plate after uncoiling, aligning after room temperature.
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CN112522567B (en) * 2019-09-19 2022-06-24 宝山钢铁股份有限公司 High-strength thin-specification high-corrosion-resistance steel and manufacturing method thereof
CN111378898A (en) * 2020-04-23 2020-07-07 湖南华菱涟源钢铁有限公司 500MPa coating-free weathering steel and manufacturing method thereof
CN114107786A (en) * 2020-08-27 2022-03-01 宝山钢铁股份有限公司 Cold-rolled high-corrosion-resistance high-strength weathering steel and manufacturing method thereof
CN112251674A (en) * 2020-10-16 2021-01-22 马鞍山钢铁股份有限公司 Hot-rolled low-yield-ratio high-weather-resistant steel for railway passenger car and manufacturing method thereof
CN114645214A (en) * 2022-03-26 2022-06-21 湖南华菱湘潭钢铁有限公司 Micro-molybdenum high-phosphorus weathering steel and manufacturing method thereof

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CN101824581A (en) * 2010-05-19 2010-09-08 马鞍山钢铁股份有限公司 High-yield strength (450MPa), high-strength and weather-resistant steel plate and production method thereof
CN102409253A (en) * 2010-09-21 2012-04-11 鞍钢股份有限公司 Weathering resistant steel for high-corrosion-resistance high-strength railway vehicle and manufacturing method of weathering resistant steel
CN103343295A (en) * 2013-05-21 2013-10-09 马钢(集团)控股有限公司 Sheet steel with high strength, high corrosion resistance and yield strength of 700 Mpa and production method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101824581A (en) * 2010-05-19 2010-09-08 马鞍山钢铁股份有限公司 High-yield strength (450MPa), high-strength and weather-resistant steel plate and production method thereof
CN102409253A (en) * 2010-09-21 2012-04-11 鞍钢股份有限公司 Weathering resistant steel for high-corrosion-resistance high-strength railway vehicle and manufacturing method of weathering resistant steel
CN103343295A (en) * 2013-05-21 2013-10-09 马钢(集团)控股有限公司 Sheet steel with high strength, high corrosion resistance and yield strength of 700 Mpa and production method thereof

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