CN105714197B - A kind of high-strength easy punch forming cold-rolled steel sheet and its production method - Google Patents
A kind of high-strength easy punch forming cold-rolled steel sheet and its production method Download PDFInfo
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- CN105714197B CN105714197B CN201410713974.4A CN201410713974A CN105714197B CN 105714197 B CN105714197 B CN 105714197B CN 201410713974 A CN201410713974 A CN 201410713974A CN 105714197 B CN105714197 B CN 105714197B
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Abstract
The present invention provides a kind of high-strength easy punch forming cold-rolled steel sheet and its production method, chemical composition wt% are：C：0.14~0.18%, Si≤0.030%, Mn：1.05~1.30%, P≤0.020%, S≤0.020%, Al：0.010~0.050%, B：0.0003~0.0008%, surplus is Fe and inevitable impurity.Continuous casting：Control targe molten steel overheat≤30 DEG C, Casting speed≤1.3m/min keep pulling rate to stablize, strand hot delivery and hot charging；Hot continuous rolling：1230~1270 DEG C of heating furnace bringing-up section temperature, 1060~1100 DEG C of finish rolling start rolling temperature, 830~900 DEG C of finishing temperature, thickness of slab are 3.5~4.0mm；600~700 DEG C of bell-type annealing temperature, 3 it is small when；When 700 DEG C of heat preservations 2 are small；When 700~670 DEG C 3 small；When 670 DEG C of heat preservations 4 are small, when 670~400 DEG C 4 small.Plate Production of the present invention is of low cost, and applicability is wide, 400~550MPa of tensile strength, elongation percentage >=23%, hardness≤75HRB, has good easy punching press and processability.
Description
Technical field
The invention belongs to metallurgical technology field, more particularly to a kind of easily stamping forming high strength cold rolled steel plate and its production
Method.
Background technology
With the development of household electric appliances, the production of household electrical appliances and household appliance and demand constantly increase, and make various household electrical appliances
The steel total amount that component and utensil use gradually increases.It is suitable except to have as household electrical appliances supporting item, structural member and parts
When tensile strength, outside hardness and special surface texture, after also there is good cold punching performance, welding performance and shaping
Heat treatment performance, it is therefore desirable to which its microstructure must possess uniform refinement, compactness, not have the features such as stomata.And with family
The trend of electric industry professional development, supporting item, structural member and the parts used on household electrical appliances have been converted into professional production, special
The supply of material, forms to the ever-increasing trend of steel grade demand.
The steel supplied at present are if it is considered that its stampability energy, then itself intensity and hardness are relatively low, after shaping
Part does not have enough intensity；And if it is considered that shaping after intensity, then in steel initial stage punch forming with regard to relatively difficult.Example
As application number 200610049193.3 provides one kind due to precise and tiny and uniform distribution of carbides and with high easily molded
Property and carbon steel sheet and preparation method thereof with good final heat treatment characteristic, the invention use the design side of the low manganese of high-carbon
Case, mean carbon content 0.35%, while silicone content also to steel strength and hardness play an important role of enhancing, therefore the steel plate due to
Intensity is excessively high and causes punching press difficult, and since manganese content is relatively low it is caused to exist centainly in welding performance and extension property
Defect.Application number 200910273211.1 discloses a kind of high-strength easy-molding atmospheric corrosion resistance steel for transmission tower and its preparation
Method, the composition design scheme of the low carbon low silicon of use, but its mean carbon content are 0.04%, make not carrying out after its shaping
The reinforcing quenching technological of real meaning, intensity and hardness are too low.It is and a kind of easily molded disclosed in application number 201310173944.4
The production method of high-strength medium plate strengthens scheme in composition design using silicomanganese, and intensity is basic uncomfortable in 900MPa or so
It closes and carries out punch forming.
Therefore, household electrical appliances structural member manufacture in be badly in need of a kind of punch process when intensity it is relatively low, shaping after by quench etc. heat
Treatment process has higher-strength and the special steel of hardness.
The content of the invention
The purpose of the present invention be intended to provide it is a kind of have excellent punching performance, be easy to molding cold-rolled steel sheet and its production
Method.
For this purpose, the solution that the present invention is taken is：
A kind of high-strength easy punch forming cold-rolled steel sheet, which is characterized in that its chemical component weight degree is：C：
0.14~0.18%, Si≤0.030%, Mn：1.05~1.30%, P≤0.020%, S≤0.020%, Al：0.010~
0.050%th, B：0.0003~0.0008%, surplus is Fe and inevitable impurity.
The each element mechanism of action is as follows：
C：It is the main intensified element of steel, reaches preferable quenching effect as mild steel, be obtained in tissue enough
More martensite, carbon content cannot be too low, but carbon content is excessively high, and can increase its intensity and hardness, reduces its ductility, shadow
Ring its punching press and processability.Therefore, consider two aspect performances, C content control range of the invention for 0.14~
0.18wt%, preferably 0.159%~0.179wt%.
Si：As reducing agent and deoxidier, Si has stronger solid solution ability in steel, can also dramatically increase the strong of steel
Degree and hardness, but the increase of Si contents also increases the brittleness of steel, influences its elongation percentage.Therefore, the present invention uses low silicon scheme, Si
Control range be≤0.030wt%.
Mn：The main function of Mn is deoxidation and expansion austenitic area, and MnS is formed together with S, reduces the harm of S, is being improved
Toughness and ductility are not reduced while steel strength, while also has the effect for the through hardening performance for improving steel.Therefore, this hair
1.05~1.30wt% of control range of bright Mn, preferably 1.1~1.20wt%.
B：Boron is the essential element that hardenability of steel is improved in the present invention, control range for 0.0003~
0.0008wt%, excessively high easy generation boron is crisp, and too low quenching degree is bad, preferably 0.0005%~0.0008wt%.
A kind of production method of high-strength easy punch forming cold-rolled steel sheet, process route are：Molten iron pretreatment-converter smelting
Refining-refining treatment-continuous casting-hot continuous rolling-section cooling-cold rolling acid rolls-bell-type annealing-skin pass mill group-rewinding unit
Or cross shearing unit-finished product packing, which is characterized in that
(1) continuous casting：Control targe molten steel overheat≤30 DEG C, Casting speed≤1.3m/min keep pulling rate to stablize, strand
Hot delivery and hot charging.Molten steel overheat directly affects that the billet quality degree of superheat is too low to be easily introduced impurity, excessively high will cause to be segregated, it is also possible to
Bleedout accident is caused to occur, therefore, molten steel overheat of the present invention controls≤30 DEG C, preferably 20 ± 5 DEG C；Pulling rate and degree of superheat phase
Match somebody with somebody, core is to control the stabilization of pulling rate, otherwise easily leads to and is mingled with and size fluctuation.
(2) hot continuous rolling：1230~1270 DEG C of heating furnace bringing-up section temperature, 1060~1100 DEG C of finish rolling start rolling temperature, finish to gauge
830~900 DEG C of temperature, obtains the hot-rolled sheet coil that microscopic structure adds pearlite for ferrite, and thickness of slab is 3.5~4.0mm.Bringing-up section
It is steel billet overheat, burning in order to prevent that temperature, which selects 1230~1270 DEG C,；Final rolling temperature selects 1060~1100 DEG C mainly to drop
Low unit load, finishing temperature selection more than Ar3 can promote even tissue to refine, reduce banded structure.
(3) bell-type annealing：600~700 DEG C of annealing temperature, 3 it is small when (heating-up time)；When 700 DEG C of heat preservations 2 are small；700~
When 670 DEG C 3 small (temperature fall time)；When 670 DEG C of heat preservations 4 are small.When 700 DEG C of heat preservations 2 are small, it can prevent excessive grain from growing up；670℃4
Hour constant temperature, can make pearlite inner sheet globular cementite be partly dissolved to form gritty texture, and be uniformly distributed in ferrite, drop
Low tissue intensity, beneficial to punching press；The machining stress generated due to cold rolling can be reduced simultaneously, reduces material hardness, to rush in next step
It is molded to prepare.
The cold-rolled steel sheet carries out carburizing and quenching treatment, the work that design parameter can be required according to user after user's punching press
Part intensity determines hardening heat and cooling rate with hardness.
Beneficial effects of the present invention are：
In present component design based on ordinary low-carbon steel, armor plate strength is improved by adding in a small amount of manganese alloy, together
When in order to increase quenching degree add in micro boron element, manufacturing cost is cheap, and applicability is wide, and 400~550MPa of tensile strength prolongs
Stretch rate >=23%, hardness≤75HRB, it is shown that preferable easily punching press and processability.The cold-rolled steel sheet in punching press intensity compared with
It is low, it is suitble to punching press, by the simple heat treatment process such as appropriate quenching after shaping, device just has very high surface hardness and strong
Degree, this steel plate are the special steels for making the components such as household electrical appliances.
Description of the drawings
Fig. 1 is cold-rolled steel sheet annealing process curve figure.
Specific embodiment
The present invention is further described below by embodiment.
It rolls rear cold-rolled steel sheet and carries out bell-type annealing processing and quenching and temper, and respectively after detection annealing and after quenching
Steel plate hardness number, detection the results show that annealing after hardness it is smaller, be easy to punch forming processing, quenching hardness is put down after shaping
More than 20HRB is added, preferably resolves device strength and support problem.Table 1~3 is the chemical composition of embodiment respectively
Table, technique table and performance table.Annealing process curve is shown in Fig. 1.
1 embodiment chemical component table of table
2 embodiment process parameter table of table
3 performance test results table of table
Note：It anneals and quenches in table and tempering process condition takes the same terms, convenient for the associated mechanical to test sample
It can be compared, parameter can be finely adjusted in practical operation, to obtain different properties of product.
Claims (2)
1. a kind of production method of high-strength easy punch forming cold-rolled steel sheet, process route are：Molten iron pretreatment-converter smelting-
Refining treatment-continuous casting-hot continuous rolling-section cooling-cold rolling acid rolls-bell-type annealing-skin pass mill group-rewinding unit or horizontal stroke
Cut unit-finished product packing, which is characterized in that
High-strength easy punch forming cold-rolled steel sheet chemical component weight degree is：C：0.14~0.18%, Si≤
0.030%th, Mn：1.05~1.30%, P≤0.020%, S≤0.020%, Al：0.010~0.050%, B：0.0003~
0.0008%, surplus is Fe and inevitable impurity；
(1) continuous casting：Control targe molten steel overheat≤30 DEG C, Casting speed≤1.3m/min keep pulling rate to stablize, strand hot sending
Hot charging；
(2) hot continuous rolling：1230~1270 DEG C of heating furnace bringing-up section temperature, 1060~1100 DEG C of finish rolling start rolling temperature, finishing temperature
830~900 DEG C, thickness of slab is 3.5~4.0mm；
(3) bell-type annealing：Heating：When time 3 is small, annealing temperature is risen to 700 DEG C by 600 DEG C；Heat preservation：It is small in 700 DEG C of heat preservations 2
When；Cooling：When time 3 is small, annealing temperature is down to 670 DEG C by 700 DEG C；Heat preservation：When 670 DEG C of heat preservations 4 are small；Cooling：Time 4
Hour, annealing temperature is down to 400 DEG C by 670 DEG C.
2. the production method of high-strength easy punch forming cold-rolled steel sheet according to claim 1, which is characterized in that the continuous casting
Molten steel overheat is controlled at 20 ± 5 DEG C.
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| CN201410713974.4A CN105714197B (en) | 2014-12-01 | 2014-12-01 | A kind of high-strength easy punch forming cold-rolled steel sheet and its production method |
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| CN201410713974.4A CN105714197B (en) | 2014-12-01 | 2014-12-01 | A kind of high-strength easy punch forming cold-rolled steel sheet and its production method |
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| CN105714197B true CN105714197B (en) | 2018-05-29 |
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| CN108277428A (en) * | 2017-01-05 | 2018-07-13 | 鞍钢股份有限公司 | A kind of gas nitrocarburizing ultralow carbon cold-rolled steel plate and its manufacturing method |
| CN107236853B (en) * | 2017-06-26 | 2019-03-26 | 武汉钢铁有限公司 | Short route rolls zinc-aluminum-magnesium coating hot forming steel and its manufacturing method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102031455A (en) * | 2009-09-30 | 2011-04-27 | 鞍钢股份有限公司 | Steel plate for stamping and quenching and manufacturing method thereof |
| CN102912218A (en) * | 2012-10-23 | 2013-02-06 | 鞍钢股份有限公司 | Tinned raw-steel plate with excellent stamping property and method for manufacturing tinned raw-steel plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4824960B2 (en) * | 2005-07-21 | 2011-11-30 | 日本精線株式会社 | Stainless steel high-strength ultrafine flat wire manufacturing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102031455A (en) * | 2009-09-30 | 2011-04-27 | 鞍钢股份有限公司 | Steel plate for stamping and quenching and manufacturing method thereof |
| CN102912218A (en) * | 2012-10-23 | 2013-02-06 | 鞍钢股份有限公司 | Tinned raw-steel plate with excellent stamping property and method for manufacturing tinned raw-steel plate |
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