CN105543630B - A kind of boracic high-carbon saw blade steel and its manufacture method - Google Patents
A kind of boracic high-carbon saw blade steel and its manufacture method Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 103
- 239000010959 steel Substances 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims abstract description 55
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 230000008569 process Effects 0.000 claims abstract description 37
- 238000003723 Smelting Methods 0.000 claims abstract description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000126 substance Substances 0.000 claims abstract description 8
- 229910052742 iron Inorganic materials 0.000 claims abstract description 6
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 5
- 238000010791 quenching Methods 0.000 claims description 34
- 230000000171 quenching effect Effects 0.000 claims description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 238000005096 rolling process Methods 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 16
- 229910052782 aluminium Inorganic materials 0.000 claims description 13
- 229910052796 boron Inorganic materials 0.000 claims description 11
- 238000005266 casting Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 10
- 238000005204 segregation Methods 0.000 claims description 10
- 229910000677 High-carbon steel Inorganic materials 0.000 claims description 9
- 239000011575 calcium Substances 0.000 claims description 9
- 238000005516 engineering process Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 238000007670 refining Methods 0.000 claims description 9
- 238000002791 soaking Methods 0.000 claims description 9
- 238000005496 tempering Methods 0.000 claims description 9
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 8
- 238000005275 alloying Methods 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 239000004411 aluminium Substances 0.000 claims description 8
- 230000007547 defect Effects 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000010813 municipal solid waste Substances 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 238000009628 steelmaking Methods 0.000 claims description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- 229910000720 Silicomanganese Inorganic materials 0.000 claims description 3
- 239000008186 active pharmaceutical agent Substances 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 230000001413 cellular effect Effects 0.000 claims description 3
- 229910052593 corundum Inorganic materials 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 3
- 241000167854 Bourreria succulenta Species 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 claims description 2
- 239000012535 impurity Substances 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 2
- 239000013078 crystal Substances 0.000 description 6
- 229910052717 sulfur Inorganic materials 0.000 description 6
- 229910052720 vanadium Inorganic materials 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 4
- 238000009749 continuous casting Methods 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910001567 cementite Inorganic materials 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000010583 slow cooling Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000004260 weight control Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- C22C38/02—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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
A kind of boracic high-carbon saw blade steel and its manufacture method, belong to saw blade steel technical field.Its chemical component weight percentage is, C：0.25%~0.32%；Si：0.20%~0.50%；Mn：0.60%~1.00%；Alt：0.010%~0.050%；B：0.0010%~0.0020%；Ca：0.0010%~0.0030%；P：≤ 0.010%；S：≤ 0.0050%；N：≤ 0.0050%；Carbon equivalent ce V scopes are 0.35%~0.49%, and remaining is Fe and inevitable impurity；Skimmed by desulfurizing iron, converter smelting, LF stoves are refined, the smelting molten steel process route of RH application of vacuum is completed.Advantage is：Quality is good, and combination property is stable, fully meets use requirement.
Description
Technical field
The invention belongs to saw blade steel technical field, more particularly to a kind of boracic high-carbon saw blade steel and its manufacture method.
Background technology
Compared with the steel grades such as straight carbon steel, ultra-low-carbon steel, high-carbon saw blade comes from the height that user uses with the production difficult point of steel
It is required that the sensitiveness with internal casting blank defect, is in particular in the following aspects：
Saw blade is mainly making high speed saw blade with steel, for cutting processing timber, stone material, steel product etc..Due to work
Condition is special, easily produces fatigue failure, therefore require tighter to the control such as nonmetallic inclusionsin steel, phosphorus, sulphur.Carbon is easy
Cause the strand carbon segregation degree in one of element of segregation, high-carbon steel slab casting cycle higher；Simultaneously as carbon content is high,
Column crystal fully grows in process of setting, and choosing point crystallization is serious, strand central element normal segregation aggravation, while the bridging of column crystal
It can also hinder molten steel to the supplement of solidification end, cause strand center porosity.Carbon segregation is easily caused the local carbon height of strand, metallurgical
In manufacturing process, high-carbon steel solidification generation primary austenite tissue, in the further cooling procedure of secondary cooling zone, choosing point crystallization is drawn
The crystal boundary of the local carbon high-order bit risen can produce network cementite tissue, and the plasticity of cementite is good, to the intensity and toughness of material
Influence is produced, causes strand easily to produce underbead crack.Different from other steel grades, high-carbon steel is in 600~800 DEG C of temperature ranges
Exist along austenite grain boundary without precipitate band, cause the fragility increase in the temperature range, easily occur austenite disconnected along intergranular
Split, cause casting billet surface corner crack occur.The temperature that high-carbon steel slab goes out after conticaster is about at 820 DEG C or so, in air cooling
Under conditions of the cooling of similar constant temperature, slab cooling speed is fast, and interior tissue is further converted, and is formed with a certain proportion of geneva
Body.High carbon martensite hardness is high, but toughness is low, and fragility is big, and the higher fragility of carbon content is bigger, and the possibility of strand fracture is just
It is bigger.
Due to boron and its peculiar property of compound, each department in national economy is widely used, such as metallurgical industry,
Glass and the industry such as ceramic industry, agricultural fertilizer, detergent and soap, flame retardant, new high-tech material direction.With other alloying elements
Compare, boron plays the role of uniqueness in steel.It has following features：Solubility of the boron in steel is low, with crystal defect (crystal boundary,
Dislocation, room) there is strong interaction, particularly it is easy to boron of the segregation in crystal boundary, or even denier, phase transformation that also can be to steel
Process and a series of performances make a significant impact；And easily with 02、N2, C, S etc. form field trash or precipitated phase.
Patent " a kind of production method of the A of CN 103173685-high-strength saw bit steel coil " is contrasted, passes through following component body
System, C：0.49~0.52%, Si：0.2~0.35%, Mn：1.45~1.60%, P：≤ 0.015%, S：≤ 0.005%, Cr：
0.2~0.25%, V：0.12~0.16%, Al：0.020~0.025%, N：≤ 0.006%；Production procedure uses converter smelting
Sheet billet continuous casting and segregation control in refining-LF refining-hot continuous rolling process, including steel saw blade production, under the slab of steel saw blade connects
The control of line slow cooling temperature, rolling open rolling, finishing temperature, the control of coiling temperature, the saw blade coil of strip of acquisition is laterally surrendered：600
~750MPa, horizontal tension：930~1040MPa, elongation percentage 19.5~26%, hardness：HRC is 20~28.The patent use compared with
High C, while adding alloying elements cr, V, while cost of alloy is increased, increases the difficulty of smelting molten steel；Meanwhile, its steel
Water refines de- H, O etc. without RH or VOD, continuous casting billet internal soundness, such as segregation, is mingled with, and banding is separated out etc., is difficult to control to.
In addition, the patent only obtains high-strength saw blade steel by general hot continuous rolling process, without subsequent heat treatment, its intensity it is steady
Qualitative, structural homogenity, is worth discussion.
Patent " a kind of A of CN 104099520-high-carbon low-alloy steel saw blade and its production method of hot milling steel plate " is contrasted, is adopted
Following component system is used, is C：0.78~0.86%, Si：0.15~0.40%, Mn：0.40~0.70%, P≤0.025%, S
≤ 0.015%, Al：0.005~0.050%, C：0~0.0050%, Cr：0.50~0.80%, V：0.15~0.25%, Ni≤
0.25%th, Cu≤0.20%, remaining is Fe and inevitable impurity；Its hot rolled steel plate manufacture method, including blast furnace ironmaking, turn
Stove steel-making, the refining of LF stoves, sheet billet continuous casting, heating of plate blank, hot continuous rolling, hot-rolled sheet coil slow cooling and Kai Ping straightening steps.According to this hair
The steel of open-birth production has higher quenching degree, hardenability and anti-temper resistance, with structure property is uniform, plate shape is good, steel
The low feature of plate residual stress, is suitable for manufacture think gauge, large scale saw blade.The patent uses higher C, higher Cr and V,
Cost of alloy increase, smelting molten steel is difficult, and its molten steel refines de- H, O etc. without RH or VOD；In embodiment, by simple
Laboratory " 830 DEG C quenching plus 420 DEG C tempering " heat treatment, its Rockwell hardness HRC scopes lack actual work between 40~45
The checking of industry creation data.
Contrast patent " a kind of CN 104178691-high-strength metallurgical saw blade steel and its heat treatment method ", chemical composition
For：C：0.30~0.60%, Si：0.15~0.30%, Mn：1.35~1.9%, P：≤ 0.02%, S：≤ 0.005%, V：
0.07~0.19%, Al：0.025~0.055%, remaining is iron Fe and inevitable impurity.The present invention is through smelting, continuous casting
Afterwards, sheet material is rolled into, sheet material becomes metallurgical saw steel after quenching, tempering heat treatment.The present invention is by offline or online
Quenching plus tempering process, hardening media is water, and this method has that cost is low, quenching degree is good, efficiency high, hardness uniform, profit
The features such as environmental protection, coordinate suitable Design of Chemical Composition, it had both been can guarantee that the requirement of high rigidity, high tenacity, simplify saw blade
Production technology, shorten production procedure, reduction energy consumption.The patent is designed by wider C content, and adds a certain amount of V, with
Water is hardening media, it is intended to by press quenching, produces high-strength saw blade steel；In general, steel saw blade specification is relatively thin, substantially all
In 15.mm and following, by press quenching, the extremely difficult control of its plate shape；For high-carbon high-strength saw blade steel, plate shape after press quenching
It is poor, corrected by follow-up plate shape, be extremely difficult, therefore its production has certain limitation.
For high-carbon boron-containing steel, how to ensure Molten Steel Cleanliness in smelting process, how to ensure in casting process in steel billet
How portion's quality, ensure steel plate comprehensive mechanical property and surface quality after rolling and being heat-treated, in the presence of certain difficulty.
The content of the invention
It is an object of the invention to provide a kind of boracic high-carbon saw blade steel and its manufacture method.Solve boracic high-carbon steel steel
The problems such as strand center portion quality and plate property are unstable, surface quality is bad.Pass through rational composition design and strict smelting
Refining, casting, rolling, quenching and tempering Technology for Heating Processing complete manufacture.
A kind of boracic high-carbon saw blade steel, its chemical component weight percentage is, C：0.25%~0.32%；Si：
0.20%~0.50%；Mn：0.60%~1.00%；Alt：0.010%~0.050%；B：0.0010%~0.0020%；
Ca：0.0010%~0.0030%；P：≤ 0.010%；S：≤ 0.0050%；N：≤ 0.0050%；Remaining is Fe and can not kept away
Exempt from impurity.
Carbon equivalent ce V (%) calculation formula：C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15, carbon equivalent ce V scopes are
0.35wt%~0.49wt%.
A kind of manufacture method of boracic high-carbon saw blade steel, is skimmed, converter smelting, LF stoves are refined, RH by desulfurizing iron
The smelting molten steel process route of application of vacuum is completed.Its step and state modulator are as follows：
1st, in smelting process, strict control chemical component weight degree scope, C：0.25%~0.32%；P：
0.005%~0.010%；S：0.0010%~0.0050%, and ensure carbon equivalent ce V within 0.35%~0.49%.
(1) during smelting molten steel, strict guarantee vacuum processing time；Wherein, RH stoves vacuum time control 15min~
20min, deep vacuum processing time controls 12min~15min.Smelting molten steel process temperature control parameter is as follows：With reference to liquidus curve
Temperature：1507℃；Degree of superheat scope：20±10℃；Tundish temperature scope：1527±10℃；RH end temp scopes：1547±
10℃；RH inlet temperature scopes：1607±10℃；LF end temp scopes：1627±10℃；LF inlet temperature scopes：1580
±10℃；Converter terminal temperature range：1650±10℃.
(2) desulfurizing iron process：Perform deep desulphation mode.
(3) converter steelmaking process：Strict control oxygen supply, slag making, pushing off the slag, deoxidation and alloying process；Taken off by force using ferro-aluminum
Oxygen, is added, and suitably adjusted according to terminal oxidisability by 2.9Kg~3.1Kg/ tons of molten steel；Alloying process using silicomanganese with Si,
With Mn, three minutes Ingredient Wt percentage of target is as follows：C：Scope 0.23%~0.26%, target 0.25%；Si：Scope
0.10%~0.20%, target 0.15%；Mn：Scope 0.55%~0.75%, target 0.65%；P% scope≤0.010%,
Target≤0.008%；S：Scope≤0.012%, target≤0.010%.
(4) LF stoves refining process：The outbound sulfur content of strict guarantee reaches target call, and aluminium content is controlled as far as possible in the range of
Make target content.The refining closure component percentage by weight control of LF stoves is as follows；C：Scope 0.28%~0.31%, target
0.29%；Si：Scope 0.15%~0.25%, target 0.20%；Mn：Scope 0.70%~0.80%, target 0.75%；P models
Enclose≤0.010%, target≤0.008%；S (%) scope≤0.0050%, target≤0.0030%；Alt：Scope 0.035%
~0.050%, target 0.040%.
(5) RH application of vacuum process：Strict guarantee depth vacuum processing time is in more than 12min；Sentence as long as aluminium content is met
Then vacuum process does not mend aluminium and adjustment steel scrap to provisioning request；Vacuum adds ferro-boron and matches somebody with somebody B after terminating, precise is added, according to residual boron
Adjustment.Ensure Calcium treatment, soft blow flow is in 60~150NL/min, soft blow time >=15min, calm time >=5min；RH terminates
Target component percentage by weight is as follows；C：Scope 0.28%~0.31%, target 0.29%；Si：Scope 0.20%~0.30%,
Target 0.25%；Mn：Scope 0.70%~0.80%, target 0.75%；P：Scope≤0.010%, target≤0.008%；S：
Scope≤0.0050%, target≤0.0030%；Alt：Scope 0.035%~0.050%, target 0.040%；B：Scope
0.0012%~0.0018%, target 0.0015%；Ca：Scope 0.0010%~0.0030%, target 0.0020%.
2nd, steel billet is cast：
(1) casting cycle carries out permanent pulling rate operation, and for high-carbon steel, pulling rate scope control exists：0.80m/min~0.90m/
min；Desired value：0.85m/min, and use dynamic soft reduction technology.Design parameter is as follows：When target pull rate is 0.80m/min
When, the 9th section of pressure value >=1200KN, the 10th section of pressure value >=800KN, the 11st section is not added with pressure value；When target pull rate is
During 0.90m/min, the 9th section of pressure value >=1200KN, the 10th section of pressure value >=1150KN, the 11st section is not added with pressure value.
(2) heating steel billet：Using walking beam heating furnace by heating steel billet to soaking temperature is set, temperature control is 1160
DEG C~1220 DEG C, steel billet time inside furnace 240min~300min, it is ensured that the abundant austenitizing of steel billet.
Strict strand center mass, it is ensured that slab defects grading is required：Center segregation C class≤1.5, middle crack≤
1.0, chink line≤1.0, triangular area crack≤1.0, Al2O3It is mingled with≤1.0, Pinhole-shaped bubble≤1.0, cellular bubble≤
1.0。
Field trash grading is required：A classes are slightly≤1.5, thin system≤2.0；B classes are slightly≤1.5, thin system≤2.0；C classes are slightly
≤ 1.5, thin system≤2.0；D classes are slightly≤1.5, thin system≤2.0；DS class≤1.5.
3rd, steel plate rolling：In the operation of rolling, using general hot rolling technology, it is ensured that finishing temperature is at 950 DEG C~1000 DEG C
Between；Not water cooling, air cooling after steel plate rolling.
4th, steel plate is heat-treated：Quenching and tempering process uses full N2Protect roller hearth furnace production；In quenching process, quenching temperature
Degree：850 DEG C~900 DEG C, soaking time：5min~20min；To ensure steel-plate shape after quenching, rationally quenching water and roller are fast,
Specific quenching water and roller speed are as follows；For≤10mm specification steel plates, roller speed is 30~40m/min, from the area's water of 1st area~20,
Correspondence water nozzle 1~20, quenching water is respectively 70,560,70,100,545,100,85,380,85,105,540,105,
420th, 520,200,300,200,300,200 and 300L；For 10mm ＜ steel plates specification≤15mm, roller speed is 20~30m/min,
From the area's water of 1st area~20, correspondence water nozzle 1~20, quenching water is respectively 170,600,170,205,540,205,85,440,
85、105、520、105、440、520、200、400、200、400、200、400L；For 15mm ＜ steel plates specification≤20mm, roller speed
For 15~20m/min, from the area's water of 1st area~20, correspondence water nozzle 1~20, quenching water is respectively 170,600,170,205,
540、205、85、440、85、105、520、105、440、520、200、400、200、400、200、400L。
In drawing process, temperature：450 DEG C~550 DEG C, soaking time：5min~20min.
By process above flow, a kind of boracic high-carbon saw blade steel produced, stable mechanical property, even tissue,
With preferable intensity, plasticity and certain impact flexibility.Wherein, state mechanical property is rolled：300MPa≤Rp0.2≤350MPa、
500MPa≤Rm≤550MPa, 35.0%≤A≤45.0%, 80J≤0 DEG C~AKv≤120J, 150≤Brinell hardness HB≤
170；Quenching state mechanical property：1150MPa≤Rp0.2≤1250MPa, 1600MPa≤Rm≤1700MPa, 6.0%≤A≤
10.0%th, 30J≤0 DEG C~AKv≤60J, 70≤Rockwell hardness HRC≤75；It is tempered state mechanical property：600MPa≤Rp0.2≤
900MPa, 700MPa≤Rm≤1000MPa, 15.0%≤A≤25.0%, 150J≤0 DEG C~AKv≤250J, 55≤Rockwell are hard
Spend HRC≤65.Steel plate rolls state and is organized as ferrite+pearlite, and quenching state is organized as martensite, and tempering state tissue is according to tempering temperature
Spend different temperable martensites, secondary troostite and tempered sorbite.
The advantage of the invention is that：
(1) by designing suitable component system, on high-carbon component base, quenching degree element B is properly added, without
Ni, Cr, Mo, Cu and microalloy element Nb, V, Ti etc., by general hot rolling, quenching, tempering process, steady production 20mm and with
Lower regular size saw blade steel.
(2) by strictly controlling smelting molten steel, steel billet to cast and steel plate rolling, Technology for Heating Processing, inside steel billet quality-
Slab defects grading is good, and internal quality of steel plate is good, and combination property is stable, fully meets use requirement.
Brief description of the drawings
Fig. 1 is that steel plate rolls state metallographic structure.
Fig. 2 is steel plate quenching state metallographic structure.
Fig. 3 is that steel plate is tempered state metallographic structure.
Embodiment
Embodiment 1
A kind of boracic high-carbon saw blade steel, chemical component weight percentage is, C：0.284%；Si：0.23%；Mn：
0.88%；P：0.009%；S：0.0037%；Alt：0.034%；B：0.0018%；CEQ：0.44%, remaining is Fe and can not
Avoid impurity.
Smelting molten steel, steel billet casting and steel plate rolling are completed, billet bloom size is：The wide * 2700mm of 250mm thickness * 1800mm
Long, plate size is：The wide * 6600mm length of 15.3mm thickness * 2200mm, 6 scales.
1st, during smelting molten steel, strict guarantee vacuum processing time；Wherein, RH stoves vacuum time is 20min, deep vacuum
Processing time is between 15min.During smelting molten steel, with reference to liquidus temperature：1507℃；Degree of superheat scope：20±5℃；
Tundish temperature scope：1527±5℃；RH end temp scopes：1547±5℃；RH inlet temperature scopes：1607±5℃；LF is tied
Beam temperature range：1627±5℃；LF inlet temperature scopes：1580±5℃；Converter terminal temperature range：1650±5℃.
2nd, converter steelmaking process：Strict control oxygen supply, slag making, pushing off the slag, deoxidation and alloying process；Using 300Kg ferro-aluminums
Strong deoxidation, and suitably adjusted according to terminal oxidisability；Alloying process is using silicomanganese with Si, with Mn, three minutes composition weights of target
Measure degree as follows；C：0.26%；Si：0.17%；Mn：0.68%；P：0.008%；S：0.0080%.
3rd, LF stoves refining process：The outbound sulfur content of strict guarantee reaches target call, and aluminium content is controlled as far as possible in the range of
To target content.The refining closure component weight percent content control of LF stoves is as follows；C：0.29%；Si：0.20%；Mn：
0.75%；P：0.008%；S：0.0040%；Alt：0.042%.
4th, RH application of vacuum process：Strict guarantee depth more than vacuum processing time 12min；Judge to want as long as aluminium content is met
Ask, vacuum process does not mend aluminium and adjustment steel scrap；Vacuum adds ferro-boron and matches somebody with somebody B after terminating, precise is added, and is adjusted according to residual boron.
Ensure Calcium treatment, soft blow flow is in 60~150NL/min, soft blow time 20min, calm time 8min；RH target end compositions
Weight percent content is as follows；C：0.284%；Si：For 0.23%；Mn：0.88；P：0.008%；S：0.0037%；Alt：
0.034%；B：0.0018%；Ca：0.0020%.
5th, steel billet is cast：
(1) casting cycle carries out permanent pulling rate operation, for high-carbon steel, pulling rate value：0.85m/min, and use Dynamic Light pressure
Lower technology；9th section of pressure value 1220KN, the 10th section of pressure value 810KN, the 11st section is not added with pressure value.
(2) strict strand center mass, slab defects grading actual value：Center segregation C classes 1.0, middle crack 0, angle
Crackle 0, triangular area crack 0, Al2O3It is mingled with 0.5, Pinhole-shaped bubble 0, cellular bubble 0.
Field trash grading is required：A classes are slightly 0, are carefully 0.5；B classes are slightly 0, are carefully 0；C classes are slightly 0, are carefully 0；D classes are slightly
0th, it is carefully 0.5；DS classes 0.
6th, heating steel billet：Using walking beam heating furnace by heating steel billet to soaking temperature is set, temperature control is 1160
DEG C~1220 DEG C, 250mm think gauge steel billet targets are in stove heat time 255min.
7th, steel plate rolling：In the operation of rolling, using general hot rolling technology, finishing temperature is at 970 DEG C；After steel plate rolling not
Water cooling, air cooling.
8th, steel plate is heat-treated：In quenching process, hardening heat：880 DEG C, soaking time：5min；Specific quenching water and roller
Speed is as follows；Roller speed is 16m/min, from the area's water of 1st area~20, correspondence water nozzle 1~20, unit：L, quenching water be 170,600,
170、205、540、205、85、440、85、105、520、105、440、520、200、400、200、400、200、400。
9th, temperature：500 DEG C, soaking time：15min；
10th, mechanical property of steel plate is as follows；Roll state property energy：Rp0.2=312MPa, Rm=523MPa, A=39.0%, 0 DEG C~
Tri- values of Akv are 113J, 114J, 109J respectively；Quenching state performance：Rp0.2=1173MPa, Rm=1620MPa, A=9.5%,
0 DEG C~Akv, tri- values are 43J, 34J, 35J respectively；It is tempered state property energy：Rp0.2=724MPa, Rm=835MPa, A=
Tri- values of 16.5%, 0 DEG C~Akv are 167J, 168J, 165J respectively.
Claims (6)
1. a kind of manufacture method of boracic high-carbon saw blade steel, is skimmed, converter smelting, LF stoves are refined, RH is true by desulfurizing iron
The smelting molten steel process route of vacancy reason is completed；Characterized in that, specific steps and parameter are as follows：
1) in smelting process, following chemical composition is controlled, is by weight percentage C：0.25%~0.32%；P：0.005%
~0.010%；S：0.0010%~0.0050%；CEV scopes are 0.35%~0.49wt%；
1. during smelting molten steel, strict guarantee vacuum processing time；Wherein, RH stoves vacuum time control 15min~
20min, deep vacuum processing time controls 12min~15min；Smelting molten steel process temperature control parameter is as follows：With reference to liquidus curve
Temperature：1507℃；Degree of superheat scope：20±10℃；Tundish temperature scope：1527±10℃；RH end temp scopes：1547±
10℃；RH inlet temperature scopes：1607±10℃；LF end temp scopes：1627±10℃；LF inlet temperature scopes：1580
±10℃；Converter terminal temperature range：1650±10℃；
2. desulfurizing iron process：Perform deep desulphation mode；
3. converter steelmaking process：Control oxygen supply, slag making, pushing off the slag, deoxidation and alloying process；Using the strong deoxidation of ferro-aluminum, by 2.9Kg
~3.1Kg/ tons of molten steel are added；Alloying process is using silicomanganese with Si, with Mn, and subject component weight percentage ranges are respectively such as
Under：C：0.23%~0.26%；Si：0.10%~0.20%；Mn：0.55%~0.75%；P：≤ 0.010%；S：≤
0.012%；
4. LF stoves refining process：LF stoves refining closure component weight percentage ranges difference is as follows：C：0.28%~0.31%；
Si：0.15%~0.25%；Mn：0.70%~0.80%；P：≤ 0.010%；S：≤ 0.0050%；Alt：0.035%~
0.050%；
5. RH application of vacuum process：As long as aluminium content, which is met, judges to require that then vacuum process does not mend aluminium and adjustment steel scrap；Vacuum knot
Ferro-boron is added after beam and matches somebody with somebody B, precise is added, and is adjusted according to residual boron；Ensure Calcium treatment, soft blow flow in 60~150NL/min,
Soft blow time >=15min, calm time >=5min；RH target end composition by weight percent scope difference is as follows；C：0.28%
~0.31%；Si：0.20%~0.30%；Mn：0.70%~0.80%；P：≤ 0.010%；S：≤ 0.0050%；Alt：
0.035%~0.050%；B：0.0012%~0.0018%；Ca：0.0010%~0.0030%；
2) steel billet is cast：
1. casting cycle carries out permanent pulling rate operation, and for high-carbon steel, pulling rate scope control exists：0.80m/min~0.90m/min；
And use dynamic soft reduction technology；Design parameter is as follows：When target pull rate is 0.80m/min, the 9th section of pressure value >=
1200KN, the 10th section of pressure value >=800KN, the 11st section is not added with pressure value；When target pull rate is 0.90m/min, the 9th section of pressure
Value >=1200KN, the 10th section of pressure value >=1150KN, the 11st section is not added with pressure value；
2. heating steel billet：Using walking beam heating furnace by heating steel billet to setting soaking temperature, temperature control 1160 DEG C~
1220 DEG C, steel billet time inside furnace 240min~300min, it is ensured that the abundant austenitizing of steel billet；
3) steel plate rolling：In the operation of rolling, it is ensured that finishing temperature is between 950 DEG C~1000 DEG C；Air cooling after steel plate rolling；
4) steel plate is heat-treated：Quenching and tempering process uses full N2Protect roller hearth furnace production；
1. in quenching process, hardening heat：850 DEG C~900 DEG C, soaking time：5min~20min；To ensure steel plate after quenching
Plate shape, specific quenching water and roller speed are as follows；For≤10mm specification steel plates, roller speed is 30~40m/min, from area of 1st area~20
Water, correspondence water nozzle 1~20, quenching water is respectively 70,560,70,100,545,100,85,380,85,105,540,
105th, 420,520,200,300,200,300,200 and 300L；For 10mm ＜ steel plates specification≤15mm, roller speed is 20~30m/
Min, from the area's water of 1st area~20, correspondence water nozzle 1~20, quenching water is respectively 170,600,170,205,540,205,85,
440、85、105、520、105、440、520、200、400、200、400、200、400L；For 15mm ＜ steel plates specification≤20mm,
Roller speed is 15~20m/min, from the area's water of 1st area~20, correspondence water nozzle 1~20, quenching water is respectively 170,600,170,
205、540、205、85、440、85、105、520、105、440、520、200、400、200、400、200、400L；
2. in drawing process, temperature：450 DEG C~550 DEG C, soaking time：5min~20min；
Described boracic high-carbon saw blade is with steel chemical composition percentage by weight, C：0.25%~0.32%；Si：0.20%~
0.50%；Mn：0.60%~1.00%；Alt：0.010%~0.050%；B：0.0010%~0.0020%；Ca：
0.0010%~0.0030%；P：≤ 0.010%；S：≤ 0.0050%；N：≤ 0.0050%；Remaining is Fe and inevitable miscellaneous
Matter；
Carbon equivalent ce V calculation formula：C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15, carbon equivalent ce V scopes be 0.35%~
0.49wt%.
2. manufacture method according to claim 1, it is characterised in that described step 1) in subject component percentage by weight
Ratio difference is as follows；C：0.25%；Si：0.15%；Mn：0.65%；P：≤ 0.008%；S：≤ 0.010%.
3. manufacture method according to claim 1, it is characterised in that described step 1) in, LF stoves refining closure component
Weight percent values difference is as follows；C：0.29%；Si：0.20%；Mn：0.75%；P：≤ 0.008%；S≤0.0030%；
Alt：0.040%.
4. manufacture method according to claim 1, it is characterised in that described step 1) in, RH target end composition weights
Measure percent value difference as follows；C：0.29%；Si：0.25%；Mn：0.75%；P：≤ 0.008%；S：≤ 0.0030%；Alt：
0.040%；B：0.0015%；Ca：0.0020%.
5. manufacture method according to claim 1, it is characterised in that described step 2) in strict strand center mass,
Ensure that slab defects grading is required：Center segregation C class≤1.5, middle crack≤1.0, chink line≤1.0, triangular area crack
≤ 1.0, Al2O3It is mingled with≤1.0, Pinhole-shaped bubble≤1.0, cellular bubble≤1.0；Field trash grading is required：A classes are slightly≤
1.5th, thin system≤2.0；B classes are slightly≤1.5, thin system≤2.0；C classes are slightly≤1.5, thin system≤2.0；D classes are slightly≤1.5, thin system
≤2.0；DS class≤1.5.
6. manufacture method according to claim 1, it is characterised in that described step 2) in casting cycle carry out permanent pulling rate
Operation, for high-carbon steel, pulling rate value is：0.85m/min.
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