CN109023115A - A kind of hot rolling template pulling-on piece steel and its manufacturing method - Google Patents
A kind of hot rolling template pulling-on piece steel and its manufacturing method Download PDFInfo
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- CN109023115A CN109023115A CN201811151661.9A CN201811151661A CN109023115A CN 109023115 A CN109023115 A CN 109023115A CN 201811151661 A CN201811151661 A CN 201811151661A CN 109023115 A CN109023115 A CN 109023115A
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
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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
- C22C38/002—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
- C22C38/04—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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
- C22C38/18—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
- 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
- C21D2211/002—Bainite
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- 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
-
- 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
- C21D2211/009—Pearlite
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- 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 Sheet Steel (AREA)
Abstract
The present invention relates to a kind of hot rolling template pulling-on piece steel and its manufacturing methods, the hot rolling template pulling-on piece steel chemical composition weight percent are as follows: C:0.22~0.75%, Si:0.17~1.60%, Mn:0.20~1.50%, C+Si/3+Mn/6=0.50~0.85%, P≤0.035%, S≤0.035%, Cr≤0.55%, Ni≤0.55%, Cu≤0.20%, remaining is iron and is inevitably mingled with.Hot rolling template pulling-on piece provided by the invention is bainite+pearlite or pearlite+ferrite with steel product tissue, 821~902MPa of yield strength, 990~1153MPa of tensile strength, elongation percentage 5~7%, 180 degree cold bend cracking, in addition total production cycle shorten to five days, reduces by 1000 yuan/ton of process cost or more.
Description
Technical field
The invention belongs to steel and iron manufacturing technical fields, and in particular to a kind of hot rolling template pulling-on piece steel and its manufacturing method.
Background technique
From the 1980s, with the rise of skyscraper at home, the building structure in China turns from brick mix structure
To antidetonation and fire protecting performance is good, steel using amount is few, cheap cast-in-place concrete structure, mould plate technique matched with its is also
High speed development is arrived.Wherein aluminum alloy mould plate is light-weight with its, easy for construction, turnover rate is high, environmental resource is friendly, concrete table
The advantages that face is high-quality is developed rapidly.Important component of the template pulling-on piece as aluminum alloy mould plate system plays solid
The effect of solid plate, it is desirable that there is enough intensity to prevent template displacement and swollen mould, installation and dismounting facilitate raising construction efficiency,
Cheap reduction construction cost.But template pulling-on piece steel lacks specification at present, enterprise procurement raw material has larger randomness,
Cause performance inconsistency larger, construction site is easily broken, and causes template displacement and swollen mould, or even cause the great of template collapsing
Safe mass accident.Therefore exploitation tensile strength be greater than 950MPa, manufacturing cost close to straight carbon steel such as Q345 hot rolled plate high property
Energy, low cost new template pulling-on piece steel are extremely urgent.
201410152167.X discloses a kind of building template pulling-on piece steel and its production technology, chemical component quality hundred
Point ratio: C=0.20~0.30%, Si=0.6~1.0%, Mn=1.2~1.6%, P≤0.035%, S≤0.035%, in steel
Residual elements Cr≤0.25%, Ni≤0.30%, Cu≤0.15%, remaining is iron and is inevitably mingled with, production technology packet
Contain: (1) smelting endpoint mass percent: C > 0.08%, S < 0.030%, P≤0.020%；(2) slab heating temperature is
1200~1300 DEG C, 1120~1180 DEG C of start rolling temperature, seven passage of roughing, total reduction is 78~82%, finishing temperature 870
~970 DEG C, coiling temperature is 670~720 DEG C；(3) cold rolling total reduction is 48~52%, slitting, punch forming after cold rolling.It should
Scheme uses the thinking design template pulling-on piece steel of low carbon high alloy, and steel grade [Si]+[Mn] is between 1.8-2.6%, alloy
It is at high cost, need to carry out the cold rolling of high reduction ratio for proof strength, cold rolling reduction ratio is between 48~52%, entire production procedure
Long, manufacturing cost is high.
Summary of the invention
The technical problem to be solved by the present invention is to aiming at the above shortcomings existing in the prior art, provide a kind of hot rolling mould
Plate pulling-on piece steel and its manufacturing method realize the manufacture of high-performance and low-cost template pulling-on piece.
In order to solve the above technical problems, present invention provide the technical scheme that
A kind of hot rolling template pulling-on piece steel is provided, chemical component weight percentage are as follows: C:0.22~0.75%, Si:
0.17~1.60%, Mn:0.20~1.50%, C+Si/3+Mn/6=0.50~0.85%, P≤0.035%, S≤0.035%,
Cr≤0.55%, Ni≤0.55%, Cu≤0.20%, remaining is iron and is inevitably mingled with.
Preferably, the hot rolling template pulling-on piece steel chemical composition weight percent are as follows: C:0.40~0.70%, Si:
0.17~0.61%, Mn:0.30~0.75%, C+Si/3+Mn/6=0.50~0.85%, P≤0.035%, S≤0.035%,
Cr≤0.55%, Ni≤0.55%, Cu≤0.20%, remaining is iron and is inevitably mingled with.
It may further be preferable that the hot rolling template pulling-on piece steel chemical composition weight percent are as follows: C:0.50~
0.65%, Si:0.17~0.37%, Mn:0.36~0.61%, C+Si/3+Mn/6=0.50~0.85%, P≤0.035%, S
≤ 0.035%, Cr≤0.55%, Ni≤0.55%, Cu≤0.20%, remaining is iron and is inevitably mingled with.
The effect of each element in the present invention:
C: carbon mainly plays a part of to improve the intensity of steel in steel, and carbon primarily forms pearlitic structrure when hot rolling, through cold
It rolls rear pearlite deformation occurs and strengthen, partially carbonized object is decomposed, and carbon, which penetrates into, passes through solution strengthening ferrite in ferrite.Carbon
Content is too low, and intensity is undesirable, and enters peritectoid area, is also easy to produce Cracks In Continuous Cast Billets.The increase of carbon makes steel simultaneously
Plasticity and toughness reduce, and are conducive to the dismounting work of pulling-on piece.The present invention claims yield strength 800-900MPa, carbon content is preferred
Scope control further limits range as 0.50-0.65% 0.40~0.70%.
Si: silicon improves steel strength by solution strengthening and refinement pearlite piece spacing in steel, while reducing plastic
Property and toughness, improve cold work hardening rate.Silicon is main deoxidier, and general content is 0.1% or more in steel, therefore Si content
Preferred scope is controlled 0.17~0.61%, further limits range as 0.17-0.37%.
Mn: manganese acts the intensity for improving steel in steel, and MnS is formed in conjunction with the S in steel, eliminates the effect of S element influences.
Mn is good deoxidier, general content 0.20-1.50%, but Mn too high levels are easy to cause in slab in continuous casting process
Heart segregation, reduces the punching performance of material, therefore Mn content preferred scope is 0.30~0.75%, further limit range as
0.36-0.61%.
C, intensity can be improved in tri- elements of Si, Mn, increases cold work hardening, but efficiency is different, three's phase interworking
Effect is obvious when conjunction, therefore it is required that controlling between 0.50~0.85% according to formula C+Si/3+Mn/6.
The present invention also provides the manufacturing method of above-mentioned hot rolling template pulling-on piece steel, main technological steps include making steel, continuous casting,
Heating, hot rolling is cooling, forming, each stage process requirement are as follows:
1) smelt: steel-making ingredient meets ingredient design, through being casting continuously to form slab, in which: continuous-casting steel pouring temperature 1499~1542
DEG C, thickness of strand is 50~150mm；
2) the complete austenite transformation of continuous casting billet advances into heating furnace, and heating temperature is 1100~1280 DEG C, and slab is in furnace
Between be 20~150min；
3) perfect recrystallization area carries out 0~4 passage roughing, per pass reduction ratio 45~55%, and finish rolling end passes are thick
2.0mm is spent, reduction ratio is less than 10%, and 820~915 DEG C of finishing temperature；
4) it carries out section cooling, batch and slow cooling, 500~710 DEG C of section cooling final temperature, cooling rate >=30 DEG C/
S, coiling temperature are 500~650 DEG C；
5) stamping.
The beneficial effects of the present invention are: 1, hot rolling template pulling-on piece provided by the invention with steel product tissue be bainite+
Pearlite or pearlite+ferrite, 821~902MPa of yield strength, 990~1153MPa of tensile strength, elongation percentage 5~
7%, (cold bend cracking is conducive to the dismounting of template to 180 degree cold bend cracking, belongs to wanting for advantageous performance and generally conventional product
Ask exactly the opposite), performance inconsistency is small between product batches, is conducive to the processing and manufacturing process of product, while reducing in use process
Damage and failure, prevent using accident.2, manufacturing method of the present invention is realized by short route steel rolling, laminar flow cooling control performance
Manufacture total time from molten iron to steel plate raw material was foreshortened to 3 hours by original three to five days, and total production cycle is by existing ten
It shorten to five days, and the manufacturing cycle shortens half；Simultaneously by removal cold rolling process, reduce pickling, the nodularization of multi-pass is moved back
The process flows such as fire, cold rolling reduce by 1000 yuan/ton of process cost or more.
Detailed description of the invention
Fig. 1 is the SEM photograph of hot rolling template pulling-on piece steel product prepared by the embodiment of the present invention 3；
Fig. 2 is the OM figure of hot rolling template pulling-on piece steel product prepared by embodiment 5.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, with reference to the accompanying drawing to the present invention make into
One step detailed description.
Hot rolling template pulling-on piece steel chemical composition weight percent of the embodiment of the present invention are as follows: C:0.22~0.75%, Si:
0.17~1.60%, Mn:0.20~1.50%, C+Si/3+Mn/6=0.50~0.85%, P≤0.035%, S≤0.035%,
Cr≤0.55%, Ni≤0.55%, Cu≤0.20%, remaining is iron and is inevitably mingled with.
Its manufacturing method comprises the technical steps that:
1) smelt: steel-making ingredient meets ingredient design, through being casting continuously to form slab, in which: continuous-casting steel pouring temperature 1499~1542
DEG C, thickness of strand is 50~150mm；
2) the complete austenite transformation of continuous casting billet advances into heating furnace, and heating temperature is 1100~1280 DEG C, and slab is in furnace
Between be 20~150min；
3) perfect recrystallization area carries out the roughing of 0-4 passage, per pass reduction ratio 45~55%, finish rolling extreme trace time rolling thickness
2.0mm, reduction ratio is less than 10%, and 820-915 DEG C of finishing temperature；
4) it carries out section cooling, batch and slow cooling, 500~710 DEG C of section cooling final temperature, cooling rate >=30 DEG C/
S, coiling temperature are 500~650 DEG C；
5) stamping.
With two kinds of mild steel and a kind of medium carbon steel 1-3 as a comparison case.
Embodiment 1-6 and comparative example 1-3 hot rolling template pulling-on piece are shown in Table 1 (weight percent) with steel chemical composition list, make
It makes process conditions and is shown in Table 2, prepared steel product performance is shown in Table 3.
Steel product main component list prepared by table 1 embodiment 1-6 and comparative example 1-3
| Steel product | C (%) | Si (%) | Mn (%) | P (%) | S (%) | C+Si/3+Mn/6 (%) |
| Embodiment 1 | 0.22 | 1.0 | 1.0 | 0.018 | 0.008 | 0.72 |
| Embodiment 2 | 0.3 | 1.0 | 0.9 | 0.018 | 0.008 | 0.78 |
| Embodiment 3 | 0.4 | 0.61 | 0.75 | 0.018 | 0.008 | 0.73 |
| Embodiment 4 | 0.5 | 0.37 | 0.61 | 0.018 | 0.008 | 0.73 |
| Embodiment 5 | 0.65 | 0.37 | 0.36 | 0.018 | 0.008 | 0.83 |
| Embodiment 6 | 0.7 | 0.17 | 0.30 | 0.018 | 0.008 | 0.81 |
| Comparative example 1 | 0.06 | 0.18 | 0.45 | 0.018 | 0.008 | 0.20 |
| Comparative example 2 | 0.05 | 0.36 | 0.54 | 0.018 | 0.008 | 0.26 |
| Comparative example 3 | 0.4 | 0.17 | 0.20 | 0.018 | 0.008 | 0.49 |
2 embodiment 1-6 of table and comparative example 1-3 fabrication process condition
Steel product performance prepared by table 3 embodiment 1-6 and comparative example 1-3
It is as shown in Figure 1 the SEM photograph of steel product prepared by embodiment 3, it is seen that it organizes to be bainite+pearlite,
Realize the performance requirement that tensile strength is greater than 950MPa；It is illustrated in figure 2 the OM figure of steel product prepared by embodiment 5, it can
See that its metallographic structure is pearlite+a small amount of ferrite, equally realizes the performance requirement that tensile strength is greater than 950MPa；While this
A little steel product can guarantee smoothly to be disconnected in clod wash, and form removal goes on smoothly after the construction of guarantee.And comparative example 1 and 2
Prepared steel product is unable to satisfy performance requirement, while not can guarantee cold bending fracture；Although and comparative example 3 meets clod wash
The requirement of fracture, but performance is slightly lower, is unable to satisfy intensity requirement.
It can be seen from the above result that steel product provided by the present embodiment is able to satisfy performance and requirement, at the same with it is existing
There is technology to compare, the present embodiment, by removal cold rolling process, reduces the works such as pickling, annealing, cold rolling in manufacturing process's process
Skill realizes manufacturing cycle reduction half, manufacturing cost reduces by 1000 yuan/ton.
Claims (4)
1. a kind of hot rolling template pulling-on piece steel, which is characterized in that its chemical component weight percentage are as follows: C:0.22~0.75%,
Si:0.17~1.60%, Mn:0.20~1.50%, C+Si/3+Mn/6=0.50~0.85%, P≤0.035%, S≤
0.035%, Cr≤0.55%, Ni≤0.55%, Cu≤0.20%, remaining is iron and is inevitably mingled with.
2. hot rolling template pulling-on piece steel according to claim 1, which is characterized in that its chemical component weight percentage are as follows:
C:0.40~0.70%, Si:0.17~0.61%, Mn:0.30~0.75%, C+Si/3+Mn/6=0.50~0.85%, P≤
0.035%, S≤0.035%, Cr≤0.55%, Ni≤0.55%, Cu≤0.20%, remaining is iron and is inevitably mingled with.
3. hot rolling template pulling-on piece steel according to claim 2, which is characterized in that its chemical component weight percentage are as follows:
C:0.50~0.65%, Si:0.17~0.37%, Mn:0.36~0.61%, C+Si/3+Mn/6=0.50~0.85%, P≤
0.035%, S≤0.035%, Cr≤0.55%, Ni≤0.55%, Cu≤0.20%, remaining is iron and is inevitably mingled with.
4. a kind of manufacturing method of any hot rolling template pulling-on piece steel of claim 1-3, which is characterized in that its main work
Skill step includes steel-making, and continuous casting, heating, hot rolling is cooling, forming, each stage process requirement are as follows:
1) smelt: steel-making ingredient meets ingredient design, through being casting continuously to form slab, in which: and 1499~1542 DEG C of continuous-casting steel pouring temperature, even
Slab thickness is 50~150mm；
2) the complete austenite transformation of continuous casting billet advances into heating furnace, and heating temperature is 1100~1280 DEG C, and slab time inside furnace is
20~150min；
3) perfect recrystallization area carries out 0~4 passage roughing, per pass reduction ratio 45~55%, finish rolling extreme trace time rolling thickness
2.0mm, reduction ratio is less than 10%, and 820~915 DEG C of finishing temperature；
4) it carries out section cooling, batch and slow cooling, 500~710 DEG C of section cooling final temperature, cooling rate >=30 DEG C/s, volume
Taking temperature is 500~650 DEG C；
5) stamping.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109763065A (en) * | 2019-01-04 | 2019-05-17 | 武汉钢铁有限公司 | A kind of template pulling-on piece hot-rolled steel and production method |
| CN109778063A (en) * | 2019-01-04 | 2019-05-21 | 武汉钢铁有限公司 | A kind of cold rolled die pulling-on piece steel and method using CSP production |
| CN110578096A (en) * | 2019-10-24 | 2019-12-17 | 广东韶钢松山股份有限公司 | Non-quenched and tempered steel for crankshaft, crankshaft forging and preparation process thereof |
| CN110592350A (en) * | 2019-10-23 | 2019-12-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Rolling method of high-strength hot-rolled steel sheet |
| CN116121657A (en) * | 2022-11-25 | 2023-05-16 | 重庆钢铁股份有限公司 | 50-excellent carbon steel strip with excellent tissue uniformity and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109763065A (en) * | 2019-01-04 | 2019-05-17 | 武汉钢铁有限公司 | A kind of template pulling-on piece hot-rolled steel and production method |
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| CN110578096A (en) * | 2019-10-24 | 2019-12-17 | 广东韶钢松山股份有限公司 | Non-quenched and tempered steel for crankshaft, crankshaft forging and preparation process thereof |
| CN110578096B (en) * | 2019-10-24 | 2021-04-30 | 广东韶钢松山股份有限公司 | Non-quenched and tempered steel for crankshaft, crankshaft forging and preparation process thereof |
| CN116121657A (en) * | 2022-11-25 | 2023-05-16 | 重庆钢铁股份有限公司 | 50-excellent carbon steel strip with excellent tissue uniformity and production method thereof |
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| CN109023115B (en) | 2020-01-31 |
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