CN107164688A - A kind of superhigh intensity steel band and its heat treatment method - Google Patents
A kind of superhigh intensity steel band and its heat treatment method Download PDFInfo
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- CN107164688A CN107164688A CN201610987408.1A CN201610987408A CN107164688A CN 107164688 A CN107164688 A CN 107164688A CN 201610987408 A CN201610987408 A CN 201610987408A CN 107164688 A CN107164688 A CN 107164688A
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- steel band
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- steel
- circulation passage
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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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- 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
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention provides a kind of heat treatment method of superhigh intensity steel band, including：By steel ingot by hot rolling, batch, pickling, slitting into after the steel band of required specification, through the ammonolysis craft gas stove that temperature is 850 1000 DEG C, and stop in burner hearth 4 8min；Again by being cooled to 300 520 DEG C after cooling device, ammonolysis craft gas stove of the temperature for 300 480 DEG C and air cooling after being incubated 15 minutes are entered afterwards, finally by the steel band sample after heat treatment through cold continuous rolling, described spring steel band finished product is obtained after trimming slitting；Its composition by weight percent of obtained finished product is calculated as C：0.65% 1.00%, Si：0.15% 0.55%, Mn：0.35% 1.00%, Cr：0.15% 0.45%, Al：0.10% 0.20%, Cu:0.01 0.03%, Ni:0.01 0.03%, V：0.05% 0.015%, P：≤ 0.009%, S：≤ 0.003%, remaining is Fe.Spring steel band material prepared by the present invention has good tensile strength and fatigue life, and it reaches the superhigh intensity spring steel use requirement of more than 2100MPa tensile strength.
Description
Technical field
The present invention relates to a kind of superhigh intensity steel band and its heat treatment method, belong to field of metal preparation.
Background technology
The condition of delivery of current spring steel band mainly has sorbitizing+cold drawn, oil-tempered, light three kinds of drawing.Supercooling is difficult to understand
Family name's body obtains pearlite, sorbite, troostite, bainite structure respectively with isothermal transformation temperature drop.The rope wherein refined
Large strain is carried out after family name's body tissue cold rolling, the spring steel band of maximum intensity and fatigue behaviour can be obtained.Refined
Sorbite tissue is needed to carry out means of isothermal quenching after austenitizing processing, and foreign countries are handled using traditional lead bath.Its advantage
It is that high temperature steel Fluid Contacting state lead can be fast with wide temperature window (300 DEG C~900 DEG C of condensing temperature) and larger thermal capacitance
Speed is cooled to the temperature of lead liquid.Yet with pollution of the lead to environment, the harm to human body, at the same invest high, energy consumption it is big and after
The problems such as product quality and cost consumption that continuous extension. g., lead tape is come.From the seventies in last century, people do to water-bath quenching instead of lead bath
Substantial amounts of experiment, the quality stability quenched yet with water-bath, and the uniformities of properties of product can not be controlled effectively
System, therefore the higher spring steel of intensity requirement is still handled using traditional lead patenting.
The content of the invention
The problem to be solved in the present invention is to provide a kind of superhigh intensity steel band and preparation method thereof.Using of the present invention
Heat treatment replaces lead bath, and uniform isothermal phase change tissue is obtained by optimizing cooling parameter, and follow-up cold rolling obtained steel band has
Very high tensile strength and fatigue life, while above-mentioned Technology for Heating Processing has environmental protection, energy-conservation and technique than traditional lead bath processing
The features such as expansion is strong.
To solve the above problems, using following technical scheme：
A kind of superhigh intensity steel band, is high-carbon low-alloy steel, and its composition by weight percent is calculated as C：0.65%-1.00%,
Si：0.15%-0.55%, Mn：0.35%-1.00%, Cr：0.15%-0.45%, Al：0.10%-0.20%, Cu:0.01-
0.03%, Ni:0.01-0.03%, V：0.05%-0.015%, P：≤ 0.009%, S：≤ 0.003%, remaining is Fe.
The heat treatment method of above-mentioned superhigh intensity steel band, by steel ingot by hot rolling, batch, pickling, slitting is into required specification
Steel band after, be 850-1000 DEG C of ammonolysis craft gas stove through temperature, and stop in burner hearth 4-8min；Filled again by cooling down
Postpone and be cooled to 300-520 DEG C, entrance temperature is 300-480 DEG C of ammonolysis craft gas stove and is incubated air cooling after 1-5 minutes afterwards,
Finally the steel band sample after heat treatment is obtained into described spring steel band finished product through cold continuous rolling after trimming slitting, wherein, cooling dress
Put and be made up of two pieces of temperature lowering boards be arrangeding in parallel, described temperature lowering board includes at least setting in main body and its cover plate, described main body
Four circulation passages are put, two of which circulation passage is be arranged in parallel along the steel band direction of motion, and remaining circulation passage is moved along steel band
Direction is vertically arranged, and the circulation passage parallel with the steel band direction of motion and the circulation passage vertical with the steel band direction of motion are connected
Logical, the cooling medium of the recyclable flowing of filling in described circulation passage, described cooling medium flows in above-mentioned circulation passage
Dynamic cooling, described cover plate is identical with the shape of main body, and cover plate is closely connected with main body, the material for the cover plate being in contact with steel band
Matter is graphite.
In a preferred embodiment, by steel ingot by being rolled into the steel band that thickness is 2.0-3.0mm, and in 800-850
Steel coil strip is coiled at DEG C.
In a preferred embodiment, the material of the main body of temperature lowering board is copper, graphite or steel；Cooling medium uses water.
In a preferred embodiment, the bar number of the circulation passage vertical with the steel band direction of motion is 4.
In a preferred embodiment, the steel band sample after heat treatment is through milling train cold continuous rolling to 0.15-0.35mm.
Compared with prior art, the spring steel band material for preparing of the present invention has good tensile strength and fatigue life,
It reaches the superhigh intensity spring steel use requirement of more than 2100MPa tensile strength.
Brief description of the drawings
Fig. 1 is the sectional view of the temperature lowering board of cooling device of the present invention.
Fig. 2 is that the SEM of the spring steel band finished product prepared through technique of the present invention schemes.
Wherein, 1- temperature lowering boards, 2- cooling mediums, the circulation passages of 3- first, the circulation passages of 4- second, the circulations of 5- the 3rd are logical
Road, the circulation passages of 6- the 4th, the circulation passages of 7- the 5th, the circulation passages of 8- the 6th.
Embodiment
The present invention is described in further details with accompanying drawing with reference to embodiments：
A kind of superhigh intensity steel band, is high-carbon low-alloy steel, and its composition by weight percent is calculated as C：0.65%-1.00%,
Si：0.15%-0.55%, Mn：0.35%-1.00%, Cr：0.15%-0.45%, Al：0.10%-0.20%, Cu:0.01-
0.03%, Ni:0.01-0.03%, V：0.05%-0.015%, P：≤ 0.009%, S：≤ 0.003%, remaining is Fe.
The heat treatment method of above-mentioned superhigh intensity steel band, comprises the following steps：
1) steel ingot is coiled into steel coil strip by being rolled into the steel band that thickness is 2.0-3.0mm at 800-850 DEG C；
2) after pickling slitting into thin steel band, or after pickling again after cold rolling slitting into thin steel band, if need to increase
Plus a time or the cold rolling thickness and the requirement of final tensile strength depending on hot rolled plate of some passages；
3) narrow steel strip is 850-1000 DEG C of ammonolysis craft gas burner hearth through temperature, and stops in burner hearth 4-8min；
4) thin steel band is by being cooled to 300-520 DEG C after cooling device, and cooling device can make steel band cooling uniformly, even
It is continuous, reach to form temperature needed for isothermal phase change tissue, entrance temperature is 300-480 DEG C of ammonolysis craft gas burner hearth and is incubated afterwards
Air cooling after 1-5 minutes；
5) sample after being heat-treated passes through milling train cold continuous rolling, and described spring steel band finished product is obtained after trimming slitting.
Cooling device of the present invention is made up of two pieces of temperature lowering boards be arrangeding in parallel 1, and temperature lowering board 1 includes main body and lid
6 circulation passages are set in plate, such as Fig. 1, the main body of temperature lowering board 1, wherein the first circulation passage 3 and the second circulation passage 4 are along steel
Tape motion direction be arranged in parallel, the 3rd circulation passage 5, the 4th circulation passage 6, the 5th circulation passage 7, the edge of the 6th circulation passage 8
The steel band direction of motion is vertically arranged, the first circulation passage 3 and the second circulation passage 4 and the 3rd circulation passage 5, the 4th circulation passage
6, the 5th circulation passage 7, the 6th circulation passage 8 is connected, the cooling medium 2 of the recyclable flowing of filling, institute in 6 circulation passages
The cooling medium 2 stated flows cooling in above-mentioned circulation passage, and main body and the closely knit connection of cover plate form a closing entirety, and lid
The material of plate is graphite, and the material of main body can be graphite, copper or steel.
Temperature lowering board 1 of the present invention can be divided into 2 part making, first be dropped according to structure fabrication described in Fig. 1 when making
The agent structure of warm plate 1, while the inside cavity in agent structure fills water as cooling medium 2, its filling rate is 60-
80%, then the shape according still further to agent structure makes the cover plate of graphite material, then by the closely knit installation of cover plate and agent structure, is
Ensure that cooling medium 2 does not flow out cover plate, when making cover plate, the position that can contact cover plate with agent structure is designed to neck shape
Shape, by cover plate with agent structure being stuck tightly, for further leakproof, refractory seals can be coated in junction
Glue.
Embodiment one
1) spring steel band composition by weight percent is calculated as C：0.80%-0.95%, Si：0.20%-0.35%, Mn：
0.35%-1.00%, Cr：0.15%-0.45%, Al：0.10%-0.20%, Cu:0.01-0.03%, Ni:0.01-
0.03%, V：0.05%-0.015%, P：≤ 0.009%, S：≤ 0.003%, remaining is Fe.Remaining is Fe.
2) steel ingot is passed through into hot rolling (roughing, finish rolling) into the steel band that thickness is 2.0mm, steel band is coiled at 800-850 DEG C
Volume.
3) after acid washing of hot rolled steel strip slitting into thin steel band, or after pickling slitting into thin steel band.
4) thin steel band is with certain speed through the ammonolysis craft gas burner hearth for being heated to 900-1000 DEG C, and steel band stops in high temperature furnace
It is 4-8min to stay the time.
5) isothermal hardening replaces lead bath using new Technology for Heating Processing after coming out of the stove, and comprises the concrete steps that：Steel band is with certain shifting
Dynamic speed is close to the graphite cake set on cooling device and passed through from the groove of coldplate, it is ensured that the steel after being cooled down through cooling device
Band temperature is 490-520 DEG C, and steel band continues to protect in 410-450 DEG C of burner hearth into ammonolysis craft gas burner hearth after air cooling 10-30s
Air cooling after warm 1-4 minutes, the sorbite tissue refined, sorbitic rate more than 95%, wherein, with the steel band direction of motion
Spacing, cooling medium between vertically disposed circulation passage, the size of circulation passage and its circulation passage circulate speed
Rate, the rate travel of steel band can influence cooling velocity, needed for only need to ensuring that the temperature of steel strips after being cooled down through cooling device reaches
Value range.
6) be heat-treated after steel strip coiling, by 13 passage cold continuous rollings to 0.2mm, obtained after trimming slitting spring steel band into
Product.There is the synusia spacing of very fine uniform, as shown in Figure 2 after sorbite is cold rolling.
7) what is obtained has good tensile strength and fatigue life, reaches that the superelevation of more than 2100MPa tensile strength is strong
Spend spring steel use requirement.
Claims (8)
1. a kind of heat treatment method of superhigh intensity steel band, it is characterised in that by steel ingot by hot rolling, batch, pickling, slitting into
It is 850-1000 DEG C of ammonolysis craft gas stove through temperature after the steel band of required specification, and stops in burner hearth 4-8min；Lead to again
300-520 DEG C is cooled to after apparatus for supercooling, afterwards into temperature for 300-480 DEG C ammonolysis craft gas stove and be incubated 1-5 point
Air cooling after clock, finally obtains described spring steel band finished product by the steel band sample after heat treatment through cold continuous rolling after trimming slitting, its
In, the closed temperature lowering board that cooling device is be arranged in parallel by two pieces is constituted, and at least four circulation passages is set on temperature lowering board, wherein two
Bar circulation passage is be arranged in parallel along the steel band direction of motion, and remaining circulation passage is vertically arranged along the steel band direction of motion, is transported with steel band
The dynamic parallel circulation passage in direction and the circulation passage vertical with the steel band direction of motion are connected, and are filled in described circulation passage
The cooling medium of recyclable flowing, described cooling medium flows cooling, and cooling device and steel band in above-mentioned circulation passage
The material in the face being in contact is graphite.
2. heat treatment method as claimed in claim 1, it is characterised in that by steel ingot by being rolled into thickness for 2.0-3.0mm
Steel band, and coil into steel coil strip at 800-850 DEG C.
3. heat treatment method as claimed in claim 1, it is characterised in that the material of cooling device housing is copper, graphite or steel；
Cooling medium uses water.
4. heat treatment method as claimed in claim 1, it is characterised in that cooling medium input port is also provided with cooling device
And delivery outlet.
5. heat treatment method as claimed in claim 3, it is characterised in that of the circulation passage vertical with the steel band direction of motion
Number is 4.
6. heat treatment method as claimed in claim 1, it is characterised in that the steel band sample after heat treatment through milling train cold continuous rolling extremely
0.15-0.35mm。
7. the superhigh intensity steel band prepared according to any described heat treatment methods of claim 1-6.
8. superhigh intensity steel band as claimed in claim 7, it is characterised in that described steel band is high-carbon low-alloy steel, its into
Percentage by weight is divided to be calculated as C：0.65%-1.00%, Si：0.15%-0.55%, Mn：0.35%-1.00%, Cr：0.15%-
0.45%, Al：0.10%-0.20%, Cu:0.01-0.03%, Ni:0.01-0.03%, V：0.05%-0.015%, P：≤
0.009%, S：≤ 0.003%, remaining is Fe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610987408.1A CN107164688B (en) | 2016-11-10 | 2016-11-10 | A kind of superhigh intensity steel band and its heat treatment method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610987408.1A CN107164688B (en) | 2016-11-10 | 2016-11-10 | A kind of superhigh intensity steel band and its heat treatment method |
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| CN107164688B CN107164688B (en) | 2018-09-28 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101348858A (en) * | 2008-08-04 | 2009-01-21 | 浙江佰耐钢带有限公司 | Non-hydraulic plate quenching device for steel belt continuous quenching and steel belt cooling method |
| JP2010138419A (en) * | 2008-12-09 | 2010-06-24 | Sanyo Special Steel Co Ltd | Austenitic stainless steel excellent in hot workability |
| CN102492824A (en) * | 2011-12-12 | 2012-06-13 | 北京科技大学 | Continuous heat treatment method of high-strength steel belts or steel plates |
-
2016
- 2016-11-10 CN CN201610987408.1A patent/CN107164688B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101348858A (en) * | 2008-08-04 | 2009-01-21 | 浙江佰耐钢带有限公司 | Non-hydraulic plate quenching device for steel belt continuous quenching and steel belt cooling method |
| JP2010138419A (en) * | 2008-12-09 | 2010-06-24 | Sanyo Special Steel Co Ltd | Austenitic stainless steel excellent in hot workability |
| CN102492824A (en) * | 2011-12-12 | 2012-06-13 | 北京科技大学 | Continuous heat treatment method of high-strength steel belts or steel plates |
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| CN107164688B (en) | 2018-09-28 |
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