CN110453055A - A kind of production method of big thickness Q500 level steel plate - Google Patents
A kind of production method of big thickness Q500 level steel plate Download PDFInfo
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- 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
- B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K15/00—Electron-beam welding or cutting
- B23K15/06—Electron-beam welding or cutting within a vacuum chamber
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- 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
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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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
- C22C38/04—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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
-
- 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
- B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/386—Plates
Abstract
The invention discloses a kind of production methods of big thickness Q500 level steel plate, including base, heating, rolling, heat treatment procedure；Blank is packed into Heating Furnace and is preheated in vacuum chamber using Electric heating by the preforming, blank after spot welding, centering technique, and 300~500 DEG C of preheating temperature, 30~50min of soaking time；It when vacuum welding, is welded using two vacuum electron beam welding guns, one of electron beam gun carries out small energy welding, and weld heat input is 20~25KJ/cm3, 30~50KJ/cm of another electron beam gun weld heat input3.The present invention passes through reasonable vacuum composite welding blank-making technology, and subsequent evenly heating heating technique depresses rolling technique with big, the production of 300~350mm thickness steel plate is realized, thickness draws performance to meet contraction percentage of area Z >=35%, and steel plate inspection can close III grade of GB/T2970-2004 or more.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of production method of big thickness Q500 level steel plate.
Background technique
As high-strength steel is developed in market to the direction that big thickness, big substance, high quality and low cost require, 300mm
It is more than thickness, the high-strength steel such as 460MPa, 550MPa obtained in international/domestic mold, engineering platform manufacture field it is large quantities of
Amount application, but domestic manufacturer can seldom produce, the producer that can be produced mainly is produced using molding operations, but is not had
Tangible metaplasia in batch produces.Until the mould steel of the 300mm or more of whole year in 2012 just breaks through 20000 tons, far below market
Demand, and cannot get the favor of foreign customers.
The country cannot steadily guarantee high inside using the high-strength steel steel plate of die casting method production 300mm or more at present
Quality and low cost price.Some Enterprises, which also have, produces such steel plate using vacuum complex technique, but can not solve to weld
The defect of the phenomenon that crackle and composite layer cracking.
In conclusion develop a kind of production method of big thickness Q500 level steel plate, solve die casting method production 300mm with
On high-strength steel steel plate, cannot steadily guarantee high internal soundness and low cost price, the production of vacuum complex technique is such
Steel plate can not solve the defect of the phenomenon that weld crack and composite layer cracking, will be of great significance.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of production methods of big thickness Q500 level steel plate.The invention solution
Die casting method of having determined produces the high-strength steel steel plate of 300mm or more, cannot steadily guarantee high internal soundness and low cost price
Lattice, vacuum complex technique produce the defect of the phenomenon that such steel plate can not solve weld crack and composite layer cracking.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of life of big thickness Q500 level steel plate
Production method, the production method include base, heating, rolling, heat treatment procedure；The preforming is advised using 2 pieces with size
Lattice, the compound base of blank progress with heat (batch) number；Blank is packed into Heating Furnace true after spot welding, centering technique, by blank
Empty room is preheated using Electric heating, and 300~500 DEG C of preheating temperature, 30~50min of soaking time, heating time cannot be too long,
Otherwise blank finished surface is easy to oxidize；It when vacuum welding, is welded using two vacuum electron beam welding guns, one of electricity
Beamlet rifle carries out small energy welding, and weld heat input is 20~25KJ/cm3, play the role of protecting pre-heat effect, another electricity
30~50KJ/cm of beamlet rifle weld heat input3。
Heating process of the present invention after base, heats, 1280~1300 DEG C of maximum heating temperature, always in soaking pit
1.0~1.8min/mm of heating time.
Rolling process of the present invention has reduction ratio >=15% of 1-2 passage in the operation of rolling, steel plate stacking after rolling
72~90h.
Heat treatment procedure of the present invention, keeps the temperature 2.0~2.5min/mm by 800~840 DEG C of normalizing temperature.
Steel plate thickness of the present invention is 300~350mm.
Plate property of the present invention: yield strength >=500MPa, 610~770MPa of tensile strength, yield tensile ratio≤0.9,
Elongation percentage >=17%, -40 DEG C of impact of collision function >=50J.
Steel plate chemical component composition and its mass percentage of the present invention are as follows: C:0.16~0.20%, Mn:1.7~
2.2%, V:1.5~2.0%, N:120~250ppm, B:0.0018~0.0035%, remaining is Fe and inevitable impurity member
Element.
Steel plate thickness of the present invention draws performance to meet contraction percentage of area Z >=35%.
Steel plate inspection of the present invention can close III grade of GB/T2970-2004 or more.
The beneficial effects of adopting the technical scheme are that the 1, present invention passes through reasonable vacuum composite welding system
Base technique, it is ensured that the base quality of composite billet and subsequent evenly heating heating technique and big pressure rolling technique, it is ensured that steel plate
Internal soundness is excellent.2, the present invention realizes the production of 300~350mm thickness steel plate, and steel plate thickness draws performance to meet section shrinkage
Rate Z >=35%, steel plate inspection can close III grade of GB/T2970-2004 or more, production efficiency with higher.3, steel plate of the present invention
Can: surrender yield strength >=500MPa, 610~770MPa of tensile strength, yield tensile ratio≤0.9, elongation percentage >=17%, -40 DEG C of longitudinal directions
Ballistic work >=50J.
Specific embodiment
The present invention will be further described in detail below with reference to specific embodiments.
Embodiment 1
The present embodiment Q500D steel plate thickness is 300mm, chemical component composition and mass percentage are as follows: C:0.16%, Mn:
1.7%, V:1.53%, N:125ppm, B:0.0018%, other ingredients meet the requirement of GB/T1591.
The production method of the big thickness Q500 level steel plate of the present embodiment includes base, heating, rolling, heat treatment procedure, tool
That steps are as follows is described for body technology:
(1) preforming: compound base is carried out using 2 pieces of same dimensions, with the blank of heat (batch) number；Blank passes through spot welding, centering
After technique, blank is packed into Heating Furnace and is preheated in vacuum chamber using Electric heating, 300 DEG C of preheating temperature, soaking time
30min；It when vacuum welding, is welded using two vacuum electron beam welding guns, one of electron beam gun carries out small energy weldering
It connects, weld heat input 20KJ/cm3, another electron beam gun weld heat input 30KJ/cm3；
(2) heating process: after base, heating in soaking pit, and 1280 DEG C of maximum heating temperature, total heating time 1.2min/mm；
(3) rolling process: the reduction ratio for having 2 passages in the operation of rolling is respectively 18%, 22%, steel plate stacking 72h after rolling；
(4) heat treatment procedure: 800 DEG C of normalizing temperature, 2.0min/mm is kept the temperature.
The present embodiment Q500D plate property index is shown in Table 1；Steel plate inspection closes GB/T2970-2004 I grades, and composite layer combines
Rate 100%；Steel plate thickness draws the performance contraction percentage of area Z:48%, 45%, 42%.
Embodiment 2
The present embodiment Q500D steel plate thickness is 320mm, chemical component composition and mass percentage are as follows: C:0.18%, Mn:
1.85%, V:1.72%, N:183ppm, B:0.0022%, other ingredients meet the requirement of GB/T1591.
The production method of the big thickness Q500 level steel plate of the present embodiment includes base, heating, rolling, heat treatment procedure, tool
That steps are as follows is described for body technology:
(1) preforming: compound base is carried out using 2 pieces of same dimensions, with the blank of heat (batch) number；Blank passes through spot welding, centering
After technique, blank is packed into Heating Furnace and is preheated in vacuum chamber using Electric heating, 350 DEG C of preheating temperature, soaking time
35min；It when vacuum welding, is welded using two vacuum electron beam welding guns, one of electron beam gun carries out small energy weldering
It connects, weld heat input 22KJ/cm3, another electron beam gun weld heat input 37KJ/cm3；
(2) heating process: after base, heating in soaking pit, and 1285 DEG C of maximum heating temperature, total heating time 1.4min/mm；
(3) rolling process: the reduction ratio for having 1 passage in the operation of rolling is 25%, steel plate stacking 75h after rolling；
(4) heat treatment procedure: 820 DEG C of normalizing temperature, 2.2min/mm is kept the temperature.
The present embodiment Q500D plate property index is shown in Table 1；Steel plate inspection closes GB/T2970-2004 I grades, and composite layer combines
Rate 100%；Steel plate thickness draws the performance contraction percentage of area Z:42%, 45%, 42%.
Embodiment 3
The present embodiment Q500C steel plate thickness is 340mm, chemical component composition and mass percentage are as follows: C:0.19%, Mn:
1.72%, V:1.90%, N:230ppm, B:0.0027%, other ingredients meet the requirement of GB/T1591.
The production method of the big thickness Q500 level steel plate of the present embodiment includes base, heating, rolling, heat treatment procedure, tool
That steps are as follows is described for body technology:
(1) preforming: compound base is carried out using 2 pieces of same dimensions, with the blank of heat (batch) number；Blank passes through spot welding, centering
After technique, blank is packed into Heating Furnace and is preheated in vacuum chamber using Electric heating, 380 DEG C of preheating temperature, soaking time
40min；It when vacuum welding, is welded using two vacuum electron beam welding guns, one of electron beam gun carries out small energy weldering
It connects, weld heat input 24KJ/cm3, another electron beam gun weld heat input 42KJ/cm3；
(2) heating process: after base, heating in soaking pit, and 1290 DEG C of maximum heating temperature, total heating time 1.5min/mm；
(3) rolling process: the reduction ratio for having 2 passages in the operation of rolling is respectively 20%, 23%, steel plate stacking 83h after rolling；
(4) heat treatment procedure: 830 DEG C of normalizing temperature, 2.4min/mm is kept the temperature.
The present embodiment Q500C plate property index is shown in Table 1；Steel plate inspection closes GB/T2970-2004 I grades, and composite layer combines
Rate 100%；Steel plate thickness draws the performance contraction percentage of area Z:38%, 40%, 42%.
Embodiment 4
The present embodiment Q500E steel plate thickness is 350mm, chemical component composition and mass percentage are as follows: C:0.20%, Mn:
1.98%, V:2.0%, N:220ppm, B:0.0024%, other ingredients meet the requirement of GB/T1591.
The production method of the big thickness Q500 level steel plate of the present embodiment includes base, heating, rolling, heat treatment procedure, tool
That steps are as follows is described for body technology:
(1) preforming: compound base is carried out using 2 pieces of same dimensions, with the blank of heat (batch) number；Blank passes through spot welding, centering
After technique, blank is packed into Heating Furnace and is preheated in vacuum chamber using Electric heating, 400 DEG C of preheating temperature, soaking time
50min；It when vacuum welding, is welded using two vacuum electron beam welding guns, one of electron beam gun carries out small energy weldering
It connects, weld heat input 25KJ/cm3, another electron beam gun weld heat input 45KJ/cm3；
(2) heating process: after base, heating in soaking pit, and 1295 DEG C of maximum heating temperature, total heating time 1.5min/mm；
(3) rolling process: the reduction ratio for having 2 passages in the operation of rolling is respectively 18%, 22%, steel plate stacking 88h after rolling；
(4) heat treatment procedure: 840 DEG C of normalizing temperature, 2.5min/mm is kept the temperature.
The present embodiment Q500E plate property index is shown in Table 1；Steel plate inspection closes GB/T2970-2004 I grades, and composite layer combines
Rate 100%；Steel plate thickness draws the performance contraction percentage of area Z:37%, 42%, 44%.
Embodiment 5
The present embodiment Q500E steel plate thickness is 310mm, chemical component composition and mass percentage are as follows: C:0.17%, Mn:
2.0%, V:1.62%, N:145ppm, B:0.0025%, other ingredients meet the requirement of GB/T1591.
The production method of the big thickness Q500 level steel plate of the present embodiment includes base, heating, rolling, heat treatment procedure, tool
That steps are as follows is described for body technology:
(1) preforming: compound base is carried out using 2 pieces of same dimensions, with the blank of heat (batch) number；Blank passes through spot welding, centering
After technique, blank is packed into Heating Furnace and is preheated in vacuum chamber using Electric heating, 430 DEG C of preheating temperature, soaking time
32min；It when vacuum welding, is welded using two vacuum electron beam welding guns, one of electron beam gun carries out small energy weldering
It connects, weld heat input 21KJ/cm3, another electron beam gun weld heat input 39KJ/cm3；
(2) heating process: after base, heating in soaking pit, and 1287 DEG C of maximum heating temperature, total heating time 1.3min/mm；
(3) rolling process: the reduction ratio for having 2 passages in the operation of rolling is respectively 20%, 22%, steel plate stacking 78h after rolling；
(4) heat treatment procedure: 810 DEG C of normalizing temperature, 2.05min/mm is kept the temperature.
The present embodiment Q500E plate property index is shown in Table 1；Steel plate inspection closes GB/T2970-2004 I grades, and composite layer combines
Rate 100%；Steel plate thickness draws the performance contraction percentage of area Z:39%, 38%, 38%.
Embodiment 6
The present embodiment Q500E steel plate thickness is 330mm, chemical component composition and mass percentage are as follows: C:0.19%, Mn:
2.07%, V:1.87%, N:215ppm, B:0.0020%, other ingredients meet the requirement of GB/T1591.
The production method of the big thickness Q500 level steel plate of the present embodiment includes base, heating, rolling, heat treatment procedure, tool
That steps are as follows is described for body technology:
(1) preforming: compound base is carried out using 2 pieces of same dimensions, with the blank of heat (batch) number；Blank passes through spot welding, centering
After technique, blank is packed into Heating Furnace and is preheated in vacuum chamber using Electric heating, 360 DEG C of preheating temperature, soaking time
45min；It when vacuum welding, is welded using two vacuum electron beam welding guns, one of electron beam gun carries out small energy weldering
It connects, weld heat input 23KJ/cm3, another electron beam gun weld heat input 45KJ/cm3；
(2) heating process: after base, heating in soaking pit, and 1292 DEG C of maximum heating temperature, total heating time 1.7min/mm；
(3) rolling process: the reduction ratio for having 2 passages in the operation of rolling is respectively 19%, 20%, steel plate stacking 81h after rolling；
(4) heat treatment procedure: 825 DEG C of normalizing temperature, 2.25min/mm is kept the temperature.
The present embodiment Q500E plate property index is shown in Table 1；Steel plate inspection closes GB/T2970-2004 I grades, and composite layer combines
Rate 100%；Steel plate thickness draws the performance contraction percentage of area Z:40%, 38%, 38%.
Embodiment 7
The present embodiment Q500E steel plate thickness is 340mm, chemical component composition and mass percentage are as follows: C:0.18%, Mn:
2.1%, V:1.50%, N:120ppm, B:0.0033%, other ingredients meet the requirement of GB/T1591.
The production method of the big thickness Q500 level steel plate of the present embodiment includes base, heating, rolling, heat treatment procedure, tool
That steps are as follows is described for body technology:
(1) preforming: compound base is carried out using 2 pieces of same dimensions, with the blank of heat (batch) number；Blank passes through spot welding, centering
After technique, blank is packed into Heating Furnace and is preheated in vacuum chamber using Electric heating, 500 DEG C of preheating temperature, soaking time
37min；It when vacuum welding, is welded using two vacuum electron beam welding guns, one of electron beam gun carries out small energy weldering
It connects, weld heat input 24KJ/cm3, another electron beam gun weld heat input 48KJ/cm3；
(2) heating process: after base, heating in soaking pit, and 1300 DEG C of maximum heating temperature, total heating time 1.8min/mm；
(3) rolling process: the reduction ratio for having 2 passages in the operation of rolling is respectively 20%, 22%, steel plate stacking 86h after rolling；
(4) heat treatment procedure: 815 DEG C of normalizing temperature, 2.35min/mm is kept the temperature.
The present embodiment Q500E plate property index is shown in Table 1；Steel plate inspection closes GB/T2970-2004 I grades, and composite layer combines
Rate 100%；Steel plate thickness draws the performance contraction percentage of area Z:42%, 40%, 40%.
Embodiment 8
The present embodiment Q500E steel plate thickness is 330mm, chemical component composition and mass percentage are as follows: C:0.16%, Mn:
2.2%, V:2.0%, N:250ppm, B:0.0035%, other ingredients meet the requirement of GB/T1591.
The production method of the big thickness Q500 level steel plate of the present embodiment includes base, heating, rolling, heat treatment procedure, tool
That steps are as follows is described for body technology:
(1) preforming: compound base is carried out using 2 pieces of same dimensions, with the blank of heat (batch) number；Blank passes through spot welding, centering
After technique, blank is packed into Heating Furnace and is preheated in vacuum chamber using Electric heating, 425 DEG C of preheating temperature, soaking time
43min；It when vacuum welding, is welded using two vacuum electron beam welding guns, one of electron beam gun carries out small energy weldering
It connects, weld heat input 20KJ/cm3, another electron beam gun weld heat input 50KJ/cm3；
(2) heating process: after base, heating in soaking pit, and 1286 DEG C of maximum heating temperature, total heating time 1.0min/mm；
(3) rolling process: the reduction ratio for having 2 passages in the operation of rolling is respectively 15%, 22%, steel plate stacking 90h after rolling；
(4) heat treatment procedure: 835 DEG C of normalizing temperature, 2.45min/mm is kept the temperature.
The present embodiment Q500E plate property index is shown in Table 1；Steel plate inspection closes GB/T2970-2004 I grades, and composite layer combines
Rate 100%；Steel plate thickness draws the performance contraction percentage of area Z:42%, 38%, 39%.
1 embodiment 1-8 plate property index of table
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to the present invention into
Go detailed description, those skilled in the art should understand that: it can still modify to the present invention or equally replace
It changes, without departing from the spirit or scope of the invention, or any substitutions, should all cover and be wanted in right of the invention
It asks in range.
Claims (9)
1. a kind of production method of big thickness Q500 level steel plate, which is characterized in that the production method include base, heating,
Rolling, heat treatment procedure；The preforming carries out compound base using 2 pieces of same dimensions, with the blank of heat (batch) number；Blank
After spot welding, centering technique, blank is packed into Heating Furnace and is preheated in vacuum chamber using Electric heating, preheating temperature
300~500 DEG C, 30~50min of soaking time；When vacuum welding, welded using two vacuum electron beam welding guns, wherein one
A electron beam gun carries out small energy welding, and weld heat input is 20~25KJ/cm3, another electron beam gun weld heat input 30
~50KJ/cm3。
2. a kind of production method of big thickness Q500 level steel plate according to claim 1, which is characterized in that the heating
Process after base, heats, 1280~1300 DEG C of maximum heating temperature, total 1.0~1.8min/mm of heating time in soaking pit.
3. a kind of production method of big thickness Q500 level steel plate according to claim 1, which is characterized in that the rolling
Process has reduction ratio >=15% of 1-2 passage, 72~90h of steel plate stacking after rolling in the operation of rolling.
4. a kind of production method of big thickness Q500 level steel plate according to claim 1, which is characterized in that at the heat
Science and engineering sequence, keeps the temperature 2.0~2.5min/mm by 800~840 DEG C of normalizing temperature.
5. a kind of production method of big thickness Q500 level steel plate according to any one of claims 1-4, feature exist
In the steel plate thickness is 300~350mm.
6. a kind of production method of big thickness Q500 level steel plate according to any one of claims 1-4, feature exist
In the plate property: yield strength >=500MPa, 610~770MPa of tensile strength, yield tensile ratio≤0.9, elongation percentage >=
17%, -40 DEG C of impact of collision function >=50J.
7. a kind of production method of big thickness Q500 level steel plate according to any one of claims 1-4, feature exist
In the steel plate chemical component composition and its mass percentage are as follows: C:0.16~0.20%, Mn:1.7~2.2%, V:1.5~
2.0%, N:120~250ppm, B:0.0018~0.0035%, remaining is Fe and inevitable impurity element.
8. a kind of production method of big thickness Q500 level steel plate according to any one of claims 1-4, feature exist
In the steel plate thickness draws performance to meet contraction percentage of area Z >=35%.
9. a kind of production method of big thickness Q500 level steel plate according to any one of claims 1-4, feature exist
In the steel plate inspection can close III grade of GB/T2970-2004 or more.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114378537A (en) * | 2022-01-14 | 2022-04-22 | 伊莱特能源装备股份有限公司 | Process for improving qualified rate of medium carbon alloy steel laminated blanks |
| CN116551140A (en) * | 2023-07-05 | 2023-08-08 | 陕西长羽航空装备股份有限公司 | Vacuum electron beam welding process for thick plate high-temperature alloy material |
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Application publication date: 20191115 |