CN110438395A - A kind of 50-80mm thickness AS NZS 3678-350L15Z15-Z35 controlled rolling state structural steel plate and its manufacturing method - Google Patents
A kind of 50-80mm thickness AS NZS 3678-350L15Z15-Z35 controlled rolling state structural steel plate and its manufacturing method Download PDFInfo
- Publication number
- CN110438395A CN110438395A CN201910634976.7A CN201910634976A CN110438395A CN 110438395 A CN110438395 A CN 110438395A CN 201910634976 A CN201910634976 A CN 201910634976A CN 110438395 A CN110438395 A CN 110438395A
- Authority
- CN
- China
- Prior art keywords
- thickness
- rolling
- controlled rolling
- temperature
- blank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
-
- 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
- C22C38/02—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
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- 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
- 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
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials 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 50-80mm thickness AS NZS 3678-350L15Z15-Z35 controlled rolling state structural steel plates, chemical component is basic element with Fe and includes following elemental composition: C:0.12-0.16%, Si:0.10-0.50%, Mn:1.30-1.60%, P :≤0.015%, S :≤0.005%, Cr :≤0.20%, Mo :≤0.08%, Ni:0.10-0.25%, Cu :≤0.30%, Al:0.02-0.04%, V :≤0.02%, Nb:0.02-0.055%, Ti:0.01-0.025%, N :≤0.008% and inevitable impurity element.Using continuous casting billet as blank through controlled rolling, aligning and etc. obtain the condition of delivery as the final products of controlled rolling state (CR).Production procedure includes " molten iron pretreatment, converter smelting, the refining of LF furnace, the refining of RH furnace, casting blank of continuous casting machine, blank heating, controlled rolling, cooling and finishing ", through AS/NZS 3678-350L15 (Z15-Z35) structural steel plate that the process can produce thickness G T.GT.GT 50-80mm, the condition of delivery is CR (controlled rolling).
Description
Technical field
The present invention relates to Z15-Z35 structural steel more particularly to a kind of AS/NZS 3678-350 series structure steel.
Background technique
Z-direction steel is being commonly called as thickness directional properties steel plate, is had for mechanical property of the thicker steel plate to its thickness direction
Special regulation.Using in the structural steel of welded connecting, when steel plate thickness not less than 15mm and bears drawing along plate thickness direction
When power, to generate lamellar tearing when avoiding welding, the steel (often referred to simply as " Z-direction steel ") of anti-lamellar tearing need to be used.Slab
There are problems that lamellar tearing, therefore to propose Z-direction performance test.This steel plate is the base in certain primary structure steel (referred to as female grade steel)
On plinth, by the steel of special smelting, processing, sulfur content be general steel 1/5 hereinafter, sectional shrinkage 15% with
On.The stress performance (predominantly ductile performance) of steel plate through-thickness is known as Z-direction performance.The Z-direction performance of steel plate can be by doing
Sample tensile test obtains, and is generally measured with the contraction percentage of area.The mark of the Z-direction steel plate of domestic product is in female grade steel grade of steel
Z-direction steel plate grade mark Z15, Z25, Z35 are added below, and the subsequent number of Z-shaped is the index (%) of sectional shrinkage.
In recent years, the two-sided goods trade exports total value of Australia and China is larger always；But steel products or steel
Product amount, ratio is smaller in its two-sided goods trade exports total value；Because of each steel products standard for having oneself by oneself.For this purpose,
AS/NZS 3678-350 structural steel series of products are researched and developed, the trade of goods of China's steel products and its product is conducive to
Outlet.
Publication number 105803330B, " a kind of normalizing hull structural steel and iron and preparation method thereof " of this invention.This
Invent " continuous casting material, the rolling, heat treatment " production technology used.With 300mm thickness continuous casting material, maximum finished product thickness is produced
Specification 80mm.It is heat-treated the product of the condition of delivery, production cycle length, high production cost.It and is hull structural steel and iron.
Publication number CN108914008A, " the economical high plastics 360MPa level structure steel plate of one kind and its life of this invention
Production method ".This method uses " continuous casting billet+controlled rolling and controlled cooling " technique, and the product 10-60mm performance yield strength of production >=
360MPa, tensile strength >=500MPa, elongation percentage >=30%,,.The invention takes that " different product specification has been used corresponding
Difference smelts ingredient and rolling mill practice, and element N, Ti content is no exception to be become ".There are difficulty for the production of its process lot；And
Cost increase.
" Z-direction spy's thick low-alloy high-strength structural steel and iron of Q345 a kind of and its life of publication number CN103469074B invention
Production method ".This method is with " 250,300mm continuous casting billet+controlled rolling+normalizing " technique, production 50-70mm thickness, surrender
Intensity 315-405MPa, tensile strength 520-555MPa, elongation 24.5-34.5%, 62% or more Q345C steel of the contraction percentage of area
Plate.This method production cycle length, high production cost and the condition of delivery are normalizing.
Summary of the invention
Q345 the or Q355 rank yield strength of current China's production, thickness G T.GT.GT 50-80mm thickness steel plate product, execution
The standards such as GB/T 1591 or GB 712.It is not suitable for Australia/New Zealand's combination with standard committee BD-023 structural steel skill
The AS/NZS3678:2016 standard that the art committee formulates.
The present invention uses 250-370mm thickness continuous casting billet production > 50-80mm thickness, the condition of delivery for the AS/ of CR (controlled rolling)
NZS 3678-350L15 (Z15-Z35) structural steel plate, comprehensive performance are able to satisfy AS/NZS 3678:2016 completely and build
It builds, the customer requirement of bridge and steel for engineering machinery product；Life cycle of the product is short, production cost is low.
The present invention in order to achieve the above objectives used by technical solution are as follows: a kind of spy thickness AS NZS3678-350L15Z15-
Z35 controlled rolling state structural steel plate, chemical component for basic element and include following elemental composition: C:0.12-0.16% with Fe,
Si:0.10-0.50%, Mn:1.30-1.60%, P :≤0.015%, S :≤0.005%, Cr :≤0.20%, Mo :≤
0.08%, Ni:0.10-0.25%, Cu :≤0.30%, Al:0.02-0.04%, V :≤0.02%, Nb:0.02-0.055%,
Ti:0.01-0.025%, N :≤0.008% and inevitable impurity element.Carbon equivalent≤0.45%.
The application Cr+Ni+Cu+Mo≤0.88%, met AS NZS 3678-350 " Cr+Ni+Cu+Mo≤
1.00% " requirement.AS/NZS 3678:2016 standard provides: the chemical component Cr+Ni+Cu+Mo of 350 grade steel plates≤
1.0%, wherein Cr≤0.25%, Ni≤0.30%, Cu≤0.40%, Mo≤0.08%；No matter these four elements make addition member
Element or residual elements, summation should meet aforementioned claim.The associated product standard of current other countries is required without this, if this
Four kinds of elements are unable to satisfy aforesaid standards, then steel plate does not meet AS/NZS 3678:2016 standard.
Yield strength >=375MPa of structural steel plate of the invention, tensile strength >=500MPa, elongation >=22%；-
15 DEG C of charpy V impact energy >=110J.The anti-lamellar tearing performance of the thickness 50-80mm of steel plate, the thickness steel plate make to belong to
Z15-Z35 series of products.Aforementioned properties are able to satisfy AS/NZS 3678:2016 completely and building, bridge and steel for engineering machinery produce
The customer requirement of product.
Product of the present invention is mainly used in building, bridge and steel for engineering machinery, has good solderability；Therefore,
Be considered as when Design of Chemical Composition: 1) carbon equivalent wants lower, makes it have good welding performance.2) intensity wants high, should meet
Product standard or client's requirement.The main function of designed chemical component each element is as follows:
C:C element in the tissue of steel in the form of cementite or pearlite in the presence of can generate very big phase transformation strengthening, mention
High intensity；While to guarantee armor plate strength, there is certain welding performance and good low-temperature impact toughness again；This hair
It is bright thus by steel C content control 0.12-0.16%.
Mn:Mn element forms the solute element of displaced type solid solution in Fe, has a significant impact to the toughness of steel, effectively
Improve the intensity of steel.
S: in micro- low-alloy steel, the content of S, which improves, declines the plasticity of steel, toughness；It is therefore preferable that for S≤
0.005%.
Nb:Nb can prevent crystal grain from growing up when low-alloy steel heats, and reach refinement crystal grain, there is precipitation enhancement；It can change
The microscopic structure of kind steel, improves performance.
Ti: it is to strengthen solid N element.In compound humble steel alloy, N preferentially will form TiN with Ti.TiN prevents heating
When AUSTENITE GRAIN COARSENING effect ratio Nb (CN) it is big；The TiN and VN being precipitated using high temperature prevent austenite recrystallization crystal grain thick
Change.
Si:Si does not form carbide in steel.Silicon forms the intensity for improving steel, Si too high levels meeting mainly with solution strengthening
The toughness of steel is caused to decline.Therefore control its proper content.
Al:Al can refine the crystal grain of steel, improve the intensity of steel, while can also improve impact flexibility.Therefore, the content of Al is fixed
It is 0.02~0.04%.
P:P belongs to black brittleness element.It is segregated between crystal grain in steel process of setting, forms high phosphorus brittle layer, mentions
The rank of high banded structure keeps the local organization of steel abnormal, reduces the plasticity of steel；And steel is made to be also easy to produce brittle crack, to welding
Performance is also unfavorable；So content of the phosphorus in steel should be reduced as far as possible.In view of production cost, the content control of P is existed
0.015% or less.
Ni:Ni is non-carbide forming element.It reduces the C content of eutectoid point, increases the volume fraction of pearlite, favorably
In raising intensity；Ar3 transformation is reduced, ferrite crystal grain is made to attenuate, improves toughness.But consider production cost, the present invention selects it
Appropriate content.
The application still further provides the production method of the structural steel: in order to improve the production efficiency, the preferred continuous casting of the application
Base as blank through controlled rolling, aligning and etc. obtain the condition of delivery be controlled rolling state (CR) the product.Main flow includes " passing through
" molten iron pretreatment, converter smelting, the refining of LF furnace, the refining of RH furnace, casting blank of continuous casting machine, blank heating, controlled rolling, cooling and essence
It is whole " etc. production processes ", the continuous casting billet for meeting the chemical component can produce thickness 50-80mm, the condition of delivery through foregoing sequence
For AS/NZS 3678-350L15 (Z15-Z35) structural steel plate of CR (controlled rolling)；The comprehensive performance of product is able to satisfy AS/ completely
The customer requirement of NZS 3678:2016 and building, bridge and steel for engineering machinery product.
Using 250-370mm thickness continuous casting billet, the techniques such as heated, rolling, heat are rectified, are cooling produce thickness G T.GT.GT 50-80mm
AS/NZS 3678-350L15 (Z15-Z35) steel plate；It is with short production cycle, production cost is low；Process is few, operates conveniently；Surrender is strong
Degree >=375MPa, tensile strength >=500MPa, elongation >=22%；- 15 DEG C of charpy V impact energy >=110J, Z-direction performance >=
40% steel sheet product, comprehensive performance is able to satisfy AS/NZS 3678:2016 standard completely and building, bridge and engineering machinery are used
The customer requirement of steel product.
Detailed description of the invention
Fig. 1 is microscopic structure at 80mm thick steel plate of the present invention cross section 1/4.
Specific embodiment
Present invention is further described in detail with reference to embodiments.
In order to improve speed of production, using continuous casting billet as blank, the preparation method of continuous casting billet: using the molten iron Jing Guo desulfurization
With high-quality steel scrap as raw material, converter bottom (top) blows smelting, whole Argon, the deoxidation of LF furnace, desulfurization, removal folder matter, adjusting component
And refining and the RH furnace degassing process of temperature；The weight percent for finally obtaining molten steel is to be basic element with Fe and include as follows
Elemental composition:: C:0.12-0.16%, Si:0.10-0.50%, Mn:1.30-1.60%, P :≤0.015%, S :≤
0.005%, Cr :≤0.20%, Mo :≤0.08%, Ni:0.10-0.25%, Cu :≤0.30%, Al:0.02-0.04%, V:
≤ 0.02%, Nb:0.02-0.055%, Ti:0.01-0.025%, N :≤0.008% and inevitable impurity element, (Cr+
Ni+Cu+Mo)≤0.88%, carbon equivalent≤0.45%, chemical component clearly fulfil AS/NZS 3678-350L15 (Z15-Z35).
It is raw through wide thickness plate continuous casting machine constant temperature, constant speed and reasonable two cold technique, solidification end dynamic soft-reduction, electromagnetic agitation
Output 250-3700mm blank.By blank scale, offline heap slow cooling >=36 hour of blank.By the blank of finishing qualification based on production
It draws and sends Rolling production.Blank meets: center segregation: B class: 0.5-1.0 grades, C:0-2.0 grades through macrostructure inspection；Center
It is loose: 0-1.5 grades；Centre burst: 0-0.5 grades；Other equal nothings.
Controlled rolling divides the two-stage: roughing controlled rolling and finishing rolling control rolling.The controlled rolling of roughing: start rolling temperature >=1000
DEG C, through 5-8 passage, to temperature thickness 110-190mm.The controlled rolling of finish rolling: 810-840 DEG C of start rolling temperature after temperature, through the road 5-9
Secondary rolling, finishing temperature are 780-860 DEG C；Three accumulative reduction ratio >=26% after finish rolling.
Controlled rolling is plastic deformation deformation and solid-state phase changes to be combined in the hot rolling and and after saving rolling
The process of heat treatment.This can produce intensity, toughness and excellent steel product, and a new process of energy energy saving.
Controlled rolling will mainly be used for the mild steel containing microelement, and main rolling mill practice is: controlled rolling parameter include temperature,
Deflection etc. obtains required tissue and performance to control recrystallization process.Certain microelements, which are added, can make tying again for steel
Brilliant start temperature increases, while suitably reducing rolling temperature；To make the effect of multi-pass deformation be superimposed, make recrystallization larger
Deflection and lower temperature under carry out, make steel obtain meet product requirement tissue and performance product.
Controlled rolling is to refine based on crystal grain, to improve the intensity of steel and the method for toughness.Occurred according to austenite
The condition of plastic deformation -- recrystallization process, non-crystallization process, two-phase section deformation, controlled rolling are often divided into: 1) first stage: difficult to understand
The rolling of family name's body recrystallization zone.This stage be at high temperature, can coarse column by the rolling of heavy reduction, when broken casting
Tissue.It is staggeredly carried out repeatedly by deformation-recrystallization, makes Austenite Grain Refinement.2) second stage: austenite Unhydrated cement
Rolling or two-phase region rolling.When this area rolls, austenite grain is extended along rolling direction, and boundary area increases, and makes ferrite
Enhancing Nucleation Density increase.Simultaneously as deformation makes to import the Zona transformans in amount in crystal grain, it is nucleated when austenite is to ferritic transformation
Point increases, and Zona transformans plays austenite grain boundary and equivalent effect.Promote ferrite transformation nucleating point in Unhydrated cement rolling
Increase, the effect of Zona transformans be it is main, austenite grain elongation effect be secondary.
In order to prevent crystal grain is grown up after rolled piece rolling, be to rolled piece in second stage when controlled rolling technological design
Its technique ginseng is strictly designed to former road drafts (or reduction ratio), the finishing temperature etc. before temperature thickness, start rolling temperature, finish to gauge
Number；Achieve the purpose that the excellent combination properties such as crystal grain refinement, even tissue, the intensity of product and the toughness of rolled piece.
The special character of the application manufacture craft: it is required that lower rolling deformation temperature, certain passage pressure (amount) rate,
Lower finishing temperature, larger product need between rolling pass to warm temperature.For equipment, Heavy Plate Production energy
In power, one of the most important condition of thickness G T.GT.GT 50-80mm product: roll-force >=55000KN of its main equipment parameters is produced；Secondly
It is the design of controlled rolling technological parameter.
Embodiment 1: the present invention designs AS/NZS 3678-350L15Z35, the thickness 370mm continuous casting that smelting chemical ingredient provides
Blank, production rolling 80mm thickness steel plate example.With 370 × 2400 × 3200mm of continuous casting billet, 80 × 3000 × L of mill product plate
(length) mm.Blank cold charge enters heating furnace, the preheating section temperature of heating furnace: 750-800 DEG C, heating one Duan Wendu: 900-1200
DEG C, heating two sections of temperature: 1190-1240 DEG C, soaking section temperature: 1200-1210 DEG C；Heat 396 minutes total times.Roughing rolling
6 passages, to temperature thickness 166mm, 810 DEG C of finishing mill start rolling temperature after temperature, finish rolling is through 8 passes, and 799 DEG C of finishing temperature；
After the completion of rolling, 3 times or leveling are rectified through straightener, send cold bed cooling, is cooled to 330 DEG C of offline heap slow cooling；Through 40 hours, take
Sample, physical and chemical inspection and quality inspection.Physicochemical property inspection result is shown in Table 1, metallographic structure such as Fig. 1.
Embodiment 2: the present invention designs AS/NZS 3678-350L15Z35, the thickness 250mm continuous casting that smelting chemical ingredient provides
Blank, production rolling 60mm thickness steel plate example.With 250 × 2400 × 3500mm of continuous casting billet, 60 × 2800 × L of mill product plate
(length) mm.Blank cold charge enters heating furnace, and heating process is divided total time 286 with example 1, heating.Roughing rolls 5 passages, to temperature
Thickness 115mm, 830 DEG C of finishing mill start rolling temperature after temperature, finish rolling is through 7 passes, and 790 DEG C of finishing temperature；After the completion of rolling,
It send cold bed cooling after straightener is rectified, is cooled to 360 DEG C of offline heap slow cooling；Sampling, physical and chemical inspection and quality inspection after 42 hours
It tests.Physicochemical property inspection result is shown in Table 1.
Table 1
Although the preferred embodiment of the present invention has been described in detail above, it is to be clearly understood that for this field
Technical staff for, the invention may be variously modified and varied.Done within the spirit and principles of the present invention
What modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of 50-80mm thickness AS NZS 3678-350L15Z15-Z35 controlled rolling state structural steel plate, it is characterised in that: the steel
The ingredient of plate is basic element with Fe and includes following elemental composition: C:0.12-0.16%, Si:0.10-0.50%, Mn:
1.30-1.60%, P :≤0.015%, S :≤0.005%, Cr :≤0.20%, Mo :≤0.08%, Ni:0.10-0.25%,
Cu :≤0.30%, Al:0.02-0.04%, V :≤0.02%, Nb:0.02-0.055%, Ti:0.01-0.025%, N :≤
0.008% and inevitable impurity element.
2. 50-80mm thickness AS NZS 3678-350L15Z15-Z35 controlled rolling state structural steel plate according to claim 1,
It is characterized by: carbon equivalent≤0.45%.
3. 50-80mm thickness AS NZS 3678-350L15Z15-Z35 controlled rolling state structural steel plate according to claim 1,
It is characterized by: yield strength >=375MPa of structural steel plate, tensile strength >=500MPa, elongation >=22%；- 15 DEG C of summers
Than V-type ballistic work >=110J.
4. a kind of prepare the control of 50-80mm thickness AS NZS 3678-350L15Z15-Z35 described in any permission in claim 1-3
Roll the method for state structural steel plate, it is characterised in that: include the following steps
(1) blank: selector closes the continuous casting billet of chemical component or pours injection as blank, blank Cr+Ni+Cu+Mo≤0.88%,
The symbol of element represents the mass percentage of the element in formula, and the macrostructure of blank meets: center segregation: B class: 0.5-1.0
Grade, C:0-2.0 grades；Center porosity: 0-1.5 grades；Centre burst: 0-0.5 grades；Other equal nothings；
(2) it heats: the preheating section temperature of heating furnace: 600-900 DEG C, two sections of one Duan Wendu: 900-1130 DEG C of heating, heating temperature
Degree: 1100-1260 DEG C, soaking section temperature: 1160-1250 DEG C, total time >=1.05H is heated, H is sotck thinkness, unit mm；
(3) de-scaling: after blank is come out of the stove and in During Controlled Rolling, removing iron scale is removed through descaling mill；
(4) it controlled rolling: is rolled including roughing controlled rolling and finishing rolling control, the controlled rolling of roughing: start rolling temperature >=1000 DEG C, warp
5-8 passage is rolled into temperature thickness；The controlled rolling of finish rolling: 810-840 DEG C of start rolling temperature after temperature, through 5-9 passes at
Product thickness, finishing temperature are 780-860 DEG C, three accumulative reduction ratio >=26% after finish rolling；
(4) direct sending heat rectification machine is aligned after the completion of rolling, and rolled piece heat rectifys temperature >=500 DEG C；
(5) send cold bed cooling after: cooling >=320 DEG C of then offline heap slow cooling, heap slow cooling time >=36 hour.
5. the preparation method according to claim 4, it is characterised in that: the blank with a thickness of 250-370mm.
6. the preparation method according to claim 4, it is characterised in that: the de-scaling of step (3) and step (4) uses thick de-scaling
Machine and pickle line processor remove removing iron scale, de-scaling hydraulic pressure >=19MPa.
7. preparation method according to claim 5, it is characterised in that: step (4) is 110-190mm to temperature thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910634976.7A CN110438395A (en) | 2019-07-15 | 2019-07-15 | A kind of 50-80mm thickness AS NZS 3678-350L15Z15-Z35 controlled rolling state structural steel plate and its manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910634976.7A CN110438395A (en) | 2019-07-15 | 2019-07-15 | A kind of 50-80mm thickness AS NZS 3678-350L15Z15-Z35 controlled rolling state structural steel plate and its manufacturing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110438395A true CN110438395A (en) | 2019-11-12 |
Family
ID=68429686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910634976.7A Pending CN110438395A (en) | 2019-07-15 | 2019-07-15 | A kind of 50-80mm thickness AS NZS 3678-350L15Z15-Z35 controlled rolling state structural steel plate and its manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110438395A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111440930A (en) * | 2020-03-18 | 2020-07-24 | 江阴兴澄特种钢铁有限公司 | AS NZS 3678-350L 15Z15-Z35 normalized steel plate and manufacturing method thereof |
| CN113249637A (en) * | 2021-05-17 | 2021-08-13 | 新疆八一钢铁股份有限公司 | Manufacturing method of 50-80 mm-thick medium-plate high-strength steel Q390D |
| CN113444969A (en) * | 2021-06-17 | 2021-09-28 | 南京钢铁股份有限公司 | Steel plate for low-temperature service condition of American standard container and production method thereof |
| CN114107635A (en) * | 2021-10-13 | 2022-03-01 | 石钢京诚装备技术有限公司 | Method for controlling cracks of low-alloy copper-containing steel |
| CN114438393A (en) * | 2022-01-14 | 2022-05-06 | 南京钢铁股份有限公司 | Method for preventing high-nickel steel from oxidation cracks along crystal |
| CN115572912A (en) * | 2022-11-08 | 2023-01-06 | 鞍钢股份有限公司 | Method for controlling cooling uniformity of steel plate for economic 460 MPa-level engineering structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101994058A (en) * | 2010-12-10 | 2011-03-30 | 武汉钢铁(集团)公司 | Quake-proof construction steel with lamellar tearing resistance and excellent performance and production method thereof |
| CN102011050A (en) * | 2010-07-15 | 2011-04-13 | 秦皇岛首秦金属材料有限公司 | Steel for 36kg-grade ocean platform and production method thereof |
| JP2013112840A (en) * | 2011-11-28 | 2013-06-10 | Jfe Steel Corp | Method for producing steel material for high heat input welding |
| CN106521320A (en) * | 2016-11-26 | 2017-03-22 | 江阴兴澄特种钢铁有限公司 | Extra-thick Q460GJCD controlled rolling state high-strength structural steel plate |
-
2019
- 2019-07-15 CN CN201910634976.7A patent/CN110438395A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102011050A (en) * | 2010-07-15 | 2011-04-13 | 秦皇岛首秦金属材料有限公司 | Steel for 36kg-grade ocean platform and production method thereof |
| CN101994058A (en) * | 2010-12-10 | 2011-03-30 | 武汉钢铁(集团)公司 | Quake-proof construction steel with lamellar tearing resistance and excellent performance and production method thereof |
| JP2013112840A (en) * | 2011-11-28 | 2013-06-10 | Jfe Steel Corp | Method for producing steel material for high heat input welding |
| CN106521320A (en) * | 2016-11-26 | 2017-03-22 | 江阴兴澄特种钢铁有限公司 | Extra-thick Q460GJCD controlled rolling state high-strength structural steel plate |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111440930A (en) * | 2020-03-18 | 2020-07-24 | 江阴兴澄特种钢铁有限公司 | AS NZS 3678-350L 15Z15-Z35 normalized steel plate and manufacturing method thereof |
| CN113249637A (en) * | 2021-05-17 | 2021-08-13 | 新疆八一钢铁股份有限公司 | Manufacturing method of 50-80 mm-thick medium-plate high-strength steel Q390D |
| CN113444969A (en) * | 2021-06-17 | 2021-09-28 | 南京钢铁股份有限公司 | Steel plate for low-temperature service condition of American standard container and production method thereof |
| CN114107635A (en) * | 2021-10-13 | 2022-03-01 | 石钢京诚装备技术有限公司 | Method for controlling cracks of low-alloy copper-containing steel |
| CN114107635B (en) * | 2021-10-13 | 2023-08-22 | 石钢京诚装备技术有限公司 | Method for controlling cracks of low-alloy copper-containing steel |
| CN114438393A (en) * | 2022-01-14 | 2022-05-06 | 南京钢铁股份有限公司 | Method for preventing high-nickel steel from oxidation cracks along crystal |
| CN114438393B (en) * | 2022-01-14 | 2023-03-21 | 南京钢铁股份有限公司 | Method for preventing crystal-oriented oxidation cracks on surface of high-nickel steel plate |
| CN115572912A (en) * | 2022-11-08 | 2023-01-06 | 鞍钢股份有限公司 | Method for controlling cooling uniformity of steel plate for economic 460 MPa-level engineering structure |
| CN115572912B (en) * | 2022-11-08 | 2023-12-15 | 鞍钢股份有限公司 | Economical 460 MPa-level steel plate cooling uniformity control method for engineering structure |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110438395A (en) | A kind of 50-80mm thickness AS NZS 3678-350L15Z15-Z35 controlled rolling state structural steel plate and its manufacturing method | |
| CN105839003B (en) | A kind of 180~200mm thickness EH36 steel plates of normalizing state delivery and preparation method thereof | |
| CN107385324B (en) | A kind of big thickness Q500GJCD high-strength building structural steel plate and its manufacturing method | |
| EP3120941B1 (en) | High toughness and high tensile strength thick steel plate and production method therefor | |
| CN105755375B (en) | A kind of continuous casting billet production low compression ratio high performance ultra-thick steel plate and its manufacture method | |
| CN101768698B (en) | Low cost yield strength 700MPA level non-tempering processing high strength steel plate and manufacturing method thereof | |
| CN110184525A (en) | A kind of high intensity Q500GJE quenched and tempered state steel plate for building structure and its manufacturing method | |
| CN105648324B (en) | A kind of big thickness rack steel plate and its production method | |
| WO2022022066A1 (en) | Steel board for polar marine engineering and preparation method therefor | |
| CN107604248B (en) | A kind of high intensity Q500GJD quenched and tempered state steel plate for building structure and its manufacturing method | |
| CA2980012A1 (en) | X80 pipeline steel with good strain-aging performance, pipeline tube and method for producing same | |
| CN108070789B (en) | Ultrafine grain super-thick steel with yield strength not less than 480MPa and preparation method thereof | |
| CN109182919A (en) | A kind of production method of heterogeneous structure high-toughness ship plate steel EH47 | |
| CN109266958A (en) | Serial Naval Architecture and Ocean Engineering F grades of steel and its Flexible Production method | |
| WO2022152158A1 (en) | High-strength and toughness free-cutting non-quenched and tempered round steel and manufacturing method therefor | |
| CN109182702A (en) | A kind of production method of heterogeneous structure high-toughness ship plate steel EH40 | |
| CN109136482A (en) | Inexpensive yield strength >=960Mpa high intensity cut deal and its production method | |
| KR20240099374A (en) | High-strength steel with excellent weather resistance and its manufacturing method | |
| CN106834946B (en) | Big thickness protects Testing Tensile Strength at Elevated Temperature steel plate SA299GrB and preparation method thereof | |
| CN101270436B (en) | Hot-rolled polyphase steel plate and method for manufacturing same | |
| CN105970099A (en) | Cu-containing crack arrest steel and preparation method thereof | |
| CN110408860A (en) | A kind of spy's thickness AS NZS 3678-350L15Z15-Z35 controlled rolling state structural steel plate and its manufacturing method | |
| CN110527920B (en) | 60-80 mm super-thick wear-resistant steel plate and production method thereof | |
| CN106086630B (en) | A kind of tough ferrite steel plate of the high strength and low cost containing nanometer precipitated phase and its manufacture method | |
| KR20070027733A (en) | High tensile steel sheet of low acoustical anisotropy excelling in weldability, and process for producing the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191112 |
|
| RJ01 | Rejection of invention patent application after publication |