CN102719756B - 42Mn wide steel stripe for knife die and manufacturing method thereof - Google Patents
42Mn wide steel stripe for knife die and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses a 42Mn wide steel stripe for a knife die and a manufacturing method of the wide steel stripe. The wide steel stripe comprises the chemical components by weight percent: 0.39%-0.46% of C, 0.80%-0.95% of Mn, 0.18%-0.35% of Si, 0.10-0.30% of Cr, 0.010%-0.050% of Ti, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.010%-0.050% of Alt, and the balance of Fe and inevitable impurity elements. The manufacturing method comprises the processes of: a steelmaking process: smelting by adopting a top-bottom combined blowing oxygen converter, refining molten steel by an LF (ladle furnace); and conveying the molten steel to a continuous casting workshop to carry out continuous casting to form a plate blank; a heating process: heating the plate blank to be at 1190-1250 DEG C, and controlling the total heating time according to 0.7-1.0min/mm; and a rolling process: controlling and rolling the heated plate blank by using a hot rolling mill, and coiling to form the steel strip, wherein the hot continuous rolling finishing temperature range is within 850-920 DEG C, and the coiling temperature range is within 640-720 DEG C. The 42Mn brand wide strip produced by using the method replaces a 30CrMo brand narrow steel strip to be supplied to a knife die factory for manufacturing the knife die, and the demands of the knife die manufacturing industry on purchase cost, width, precision, performance and surface quality of the steel strip are met.
Description
Technical field
The present invention relates to hot rolled strip manufacturing technology field, particularly a kind of 42Mn knife mold wide strip and manufacture method thereof.
Background technology
GB/T 709-2006 " size of hot-rolled steel plates and sheets, profile, weight and permissible variation " is defined as wide strip with the steel band that width is not less than 600mm.In the knife mold industry, the knife mold that is used for the goods cutting stocks such as leather, silk, textiles, paper, fiberboard, rubber, latex, usually use 30CrMo trade mark narrow steel strip to make, technological process is with the cold rolling blank that goes out with cutting edge after the hot rolled strip itemize, then through thermal treatment, forms.Because this steel band contains high Cr(0.85%～1.10%), Mo(0.15%～0.25%) etc. the noble metal element, knife mold industry production cost is higher; In addition, the surface oxidation bed thickness of narrow steel strip, size deviation is large, and the width of narrow steel strip is restricted, is not easy to blanking, and the raw material storage storage is high, and material use efficiency is low.Along with the development of society, the knife mold production has proposed requirements at the higher level to purchase cost, wide cut, precision, performance and the surface quality of steel band.
Summary of the invention
, in view of current condition, the object of the present invention is to provide the plate face width, precision is high, performance good, surface quality is excellent, production cost is low a kind of 42Mn knife mold is with wide strip and manufacture method thereof.
General thought of the present invention is to launch around customer need: must at first reduce the production cost of hot rolled strip in order to reduce the steel band price, design brand-new composition, reduce or alternative noble metal consumption; , in order to ensure the product use properties, require product to have enough intensity and hardness; , in order to facilitate the manufacturing processing of knife mold, require steel plate to have plate face width, precision is high, surface quality is excellent, good processibility.The 42Mn knife mold wide strip of the present invention's name, adopted the Composition Design of the low Cr-Ti of Mn-system, do not use high-content Cr and Mo metallic element, adopts high-precision hot continuous mill rolling, and width, at 700mm ~ 2000mm, is convenient to the blanking itemize and is sheared.The operation of rolling guarantees that by rational controlled rolling the ferrite that is organized as of steel band adds perlite, makes steel band that good hardening capacity be arranged, and has good obdurability after Q-tempering.
A kind of 42Mn knife mold wide strip of the present invention, its chemical composition by mass percent is: C 0.39% ~ 0.46%, Mn 0.80% ~ 0.95%, Si 0.18% ~ 0.35%, and Cr 0.10% ~ 0.30%, and Ti 0.010% ~ 0.050%, P≤0.020%, S≤0.010%, Alt 0.010% ~ 0.050%, and all the other are iron Fe and inevitable impurity element.
A kind of 42Mn knife mold wide strip of the present invention, adopt the Composition Design of the low Cr-Ti of Mn-system, and reason is:
(1) C: carbon content of the present invention is chosen in 0.39% ~ 0.46%, consider that mainly carbon is the most cheap in ferrous materials, the most effective strengthening element, dissolve in matrix, can play solution strengthening effect, simultaneously can form cementite and multiple carbide in steel, play the precipitation strength effect, further improve the intensity of steel;
(2) Si: silicone content of the present invention is 0.18% ~ 0.35%, Si mainly improves the intensity of steel with the solution strengthening form, it simultaneously is also the deoxidant element in steel, but too high levels, also can reduce plasticity and toughness and the weldability of steel, heating steel billet rear surface iron scale toughness is increased, easily make surface of steel plate the cosmetic issues such as pit occur;
(3) Mn: manganese content of the present invention is 0.80% ~ 0.95%, Mn is weak carbide forming element, and its effect in smelting is deoxidation and the disadvantageous effect of eliminating sulphur, can also reduce austenite transformation temperature, the refinement ferrite crystal grain, be conducive to improve intensity and the toughness of steel.Manganese can also solid solution in ferrite, play solution strengthening effect, along with Mn content improves, the intensity of steel increases, but too high Mn also will reduce toughness and the weldability of steel;
(4) Cr: chromium content of the present invention is 0.10% ~ 0.30%, and chromium is to improve the element of hardening capacity in steel, is mainly to form carbide Cr with carbon
7C
3Or Cr
23C
6, can also form double carbide with carbon, improve hardness and the wear resistance of steel;
(5) Ti: titanium content of the present invention is that 0.010% ~ 0.050%, Ti is strong carbide and nitride forming element, plays crystal grain thinning and improves the effect of obdurability.Titanium or good reductor, can improve welding property;
(6) Alt: aluminium content of the present invention is that 0.010% ~ 0.050%, Al is main deoxidant element, the crystal grain of energy refinement steel.This is because aluminium forms with the nitrogen element AlN compound that small and dispersed distributes in steel, rises and hinders grain growth, Grain refinement.In addition, the aluminium too high levels, can make the weldability of steel degenerate;
(7) upper limit of the impurity element in steel is controlled to be P≤0.020%, and S≤0.010%, to improve the purity of steel, improves the plasticity and toughness of steel.
A kind of being exclusively used in produced the manufacture method of 42Mn knife mold with wide strip, and its production technique is as follows:
(1) process for making: adopt the top and bottom complex blowing oxygen coverter to smelt, molten steel is again through LF stove refining treatment, add alloy, make chemical composition meet C 0.39% ~ 0.46%, Mn 0.80% ~ 0.95%, Si 0.18% ~ 0.35%, Cr 0.10% ~ 0.30%, Ti 0.010% ~ 0.050%, P≤0.020%, S≤0.010%, Alt 0.010% ~ 0.050%, after molten steel composition reaches above-mentioned target call, feed calcium line 400m～800m, 5～10 minutes soft blow argon time, refining finishes, molten steel is delivered to continuous casting workshop to carry out continuous casting and becomes slab, 1500 ℃～1525 ℃ of tundish temperatures,
(2) heating process: with heating of plate blank to 1190 ~ 1250 ℃, heating total time is controlled by 0.7 ~ 1.0 minute/mm;
(3) rolling technology: use the heated slab of hot continuous mill controlled rolling, coil into steel band, hot continuous rolling finishing temperature scope is 850 ℃～920 ℃, and the coiling temperature scope is 640 ℃～720 ℃;
(4) roll rear process for cooling: the steel band after hot rolling adopts to concentrate stacks air cooling.
The invention has the advantages that the Composition Design that has adopted the low Cr-Ti of Mn-system, use manganese, chromium, titanium, aluminium as alloying element, take full advantage of refined crystalline strengthening, solution strengthening and precipitation strength mechanism, by rational controlled rolling technique, guaranteed the uniform crystal particles refinement of steel band, be organized as ferrite and add perlite, the steel band of preparation has high obdurability after quenching and tempering heat treatment; Knife mold of the present invention adopts a small amount of Cr with wide strip,, without the manufacture method of noble element Mo, has saved Cr, Mo Precious Metals Resources, has reduced cost of alloy, has realized low cost production; Knife mold of the present invention uses hot continuous mill production with wide strip, the thickness of strips precision is high, poor little with plate, surface quality is good, width is 700 mm ~ 2000mm, and knife mold factory can become the required width specifications of various knife molds by the cutting itemize, and it is convenient to produce, the raw material storage storage that has reduced, met the requirement of knife mold industry to novel material.
Embodiment
It is prepared that steel band in the following example is the designed chemical composition of the present invention, process for making and hot rolling technology.
Embodiment 1:
The 42Mn knife mold wide strip of the present embodiment, manufacturing process is as follows:
(1) process for making: adopt the top and bottom complex blowing oxygen coverter to smelt, molten steel is again through LF stove refining treatment, add alloy, after molten steel composition reaches design requirements of the present invention, feed calcium line 680m, 5 minutes soft blow argon time, refining finishes, molten steel is delivered to continuous casting workshop to carry out continuous casting and becomes slab, 1500 ℃～1525 ℃ of tundish temperatures.Sample examination, the slab composition by mass percent is: C 0.39%, and Mn 0.95%, and Si 0.35%, and Cr 0.30%, and Ti 0.045%, and P 0.016%, and S 0.006%, and Alt 0.035%, and all the other are iron Fe and inevitable impurity element;
(2), heating process: with heating of plate blank to 1250 ℃, heating total time is controlled by 0.7 minute/mm;
(3), rolling technology: the target thickness of steel band is that 2.3mm, width are 700mm, uses the heated slab of hot continuous mill controlled rolling, dimension control: thickness permissible variation+0.10～-0.10mm, width permissible variation 0～+ 20mm, coil into steel band.Hot continuous rolling finishing temperature scope is 920 ℃, and the coiling temperature scope is 720 ℃;
(4), roll rear process for cooling: the steel band after hot rolling adopts to concentrate stacks air cooling.
Embodiment 2:
The 42Mn knife mold wide strip of the present embodiment, manufacturing process is as follows:
(1) process for making: adopt the top and bottom complex blowing oxygen coverter to smelt, molten steel is again through LF stove refining treatment, add alloy, after molten steel composition reaches design requirements of the present invention, feed calcium line 720m, 6 minutes soft blow argon time, refining finishes, molten steel is delivered to continuous casting workshop to carry out continuous casting and becomes slab, 1500 ℃～1525 ℃ of tundish temperatures.Sample examination, the slab composition by mass percent is: C 0.41%, and Mn 0.85%, and Si 0.32%, and Cr 0.22%, and Ti 0.050%, and P 0.020%, and S 0.004%, and Alt 0.010%, and all the other are iron Fe and inevitable impurity element;
(2), heating process: with heating of plate blank to 1230 ℃, heating total time is controlled by 0.8 minute/mm;
(3), rolling technology: the target thickness of steel band is 3.0mm, and width is 1050mm, uses the heated slab of hot continuous mill controlled rolling, dimension control: thickness permissible variation+0.10～-0.10mm, width permissible variation 0～+ 20mm, coil into steel band.Hot continuous rolling finishing temperature scope is 910 ℃, and the coiling temperature scope is 700 ℃;
(4), roll rear process for cooling: the steel band after hot rolling adopts to concentrate stacks air cooling.
Embodiment 3:
The manufacturing process of the present embodiment is as follows:
(1) process for making: adopt the top and bottom complex blowing oxygen coverter to smelt, molten steel is again through LF stove refining treatment, add alloy, after molten steel composition reaches design requirements of the present invention, feed calcium line 650m, 8 minutes soft blow argon time, refining finishes, molten steel is delivered to continuous casting workshop to carry out continuous casting and becomes slab, 1500 ℃～1525 ℃ of tundish temperatures.Sample examination, the slab composition by mass percent is: C 0.46%, and Mn 0.80%, and Si 0.18%, and Cr 0.10%, and Ti 0.010%, and P 0.020%, and S 0.010%, and Alt 0.010%, and all the other are iron Fe and inevitable impurity element;
(2), heating process: with heating of plate blank to 1220 ℃, heating total time is controlled by 0.9 minute/mm;
(3), rolling technology: the target thickness of steel band is 3.5mm, and width is 1220mm, uses the heated slab of hot continuous mill controlled rolling, dimension control: thickness permissible variation+0.10～-0.10mm, width permissible variation 0～+ 20mm, coil into steel band.Hot continuous rolling finishing temperature scope is 880 ℃, and the coiling temperature scope is 680 ℃;
(4), roll rear process for cooling: the steel band after hot rolling adopts to concentrate stacks air cooling.
Embodiment 4:
The manufacturing process of the present embodiment is as follows:
(1) process for making: adopt the top and bottom complex blowing oxygen coverter to smelt, molten steel is again through LF stove refining treatment, add alloy, after molten steel composition reaches design requirements of the present invention, feed calcium line 800m, 9 minutes soft blow argon time, refining finishes, molten steel is delivered to continuous casting workshop to carry out continuous casting and becomes slab, 1500 ℃～1525 ℃ of tundish temperatures.Sample examination, the slab composition by mass percent is: C 0.45%, and Mn 0.85%, and Si 0.20%, and Cr 0.20%, and Ti 0.012%, and P 0.015%, and S 0.008%, and Alt 0.050%, and all the other are iron Fe and inevitable impurity element;
(2), heating process: with heating of plate blank to 1200 ℃, heating total time is controlled by 1.0 minutes/mm;
(3), rolling technology: the target thickness of steel band is 4.0mm, and width is 1500mm, uses the heated slab of hot continuous mill controlled rolling, dimension control: thickness permissible variation+0.12～-0.12mm, width permissible variation 0～+ 20mm, coil into steel band.Hot continuous rolling finishing temperature scope is 890 ℃, and the coiling temperature scope is 680 ℃;
(4), roll rear process for cooling: the steel band after hot rolling adopts to concentrate stacks air cooling.
Embodiment 5:
The manufacturing process of the present embodiment is as follows:
(1) process for making: adopt the top and bottom complex blowing oxygen coverter to smelt, molten steel is again through LF stove refining treatment, add alloy, after molten steel composition reaches design requirements of the present invention, feed calcium line 500m, 10 minutes soft blow argon time, refining finishes, molten steel is delivered to continuous casting workshop to carry out continuous casting and becomes slab, 1500 ℃～1525 ℃ of tundish temperatures.Sample examination, the slab composition by mass percent is: C 0.43%, and Mn 0.80%, and Si 0.30%, and Cr 0.23%, and Ti 0.019%, and P 0.010%, and S 0.006%, and Alt 0.030%, and all the other are iron Fe and inevitable impurity element;
(2), heating process: with heating of plate blank to 1190 ℃, heating total time is controlled by 1.0 minutes/mm;
(3), rolling technology: the target thickness of steel band is 4.5mm, and width is 2000mm, uses the heated slab of hot continuous mill controlled rolling, dimension control: thickness permissible variation+0.12～-0.12mm, width permissible variation 0～+ 20mm, coil into steel band.Hot continuous rolling finishing temperature scope is 850 ℃, and the coiling temperature scope is 640 ℃;
(4), roll rear process for cooling: the steel band after hot rolling adopts to concentrate stacks air cooling.
To the 42Mn wide strip sampling of embodiment 1～5, its tissue, mechanical property are tested respectively, test result is in Table 1:
Table 1 42Mn wide strip mechanical property and tissue
The performance test results after knife mold is made in Table 2 by cold rolling, quenching, tempering by knife mold factory:
The knife mold assay that table 2 embodiment of the present invention is made
Folding test method explanation: the folding test method is that knife mold steel band one end is clipped in fixing fixture, with the other end bending, even if the steel band bending during to the bending angle stipulated bending part do not occur that crackle is qualified, otherwise just defective.
Claims (1)
1. 42Mn knife mold wide strip, it is characterized in that, chemical composition by mass percent is: C 0.41% ~ 0.46%, and Mn 0.80% ~ 0.95%, Si 0.18% ~ 0.35%, Cr 0.10% ~ 0.30%, and Ti 0.010% ~ 0.050%, P≤0.020%, S≤0.010%, Alt 0.010% ~ 0.050%, and all the other are iron Fe and inevitable impurity element, and its matrix is ferrite+perlite.
2. one kind is exclusively used in the manufacture method of production 42Mn knife mold claimed in claim 1 with wide strip, and its production technique is as follows:
(1) process for making: adopt the top and bottom complex blowing oxygen coverter to smelt, molten steel is again through LF stove refining treatment, add alloy, make chemical composition meet C 0.41% ~ 0.46%, Mn 0.80% ~ 0.95%, Si 0.18% ~ 0.35%, Cr 0.10% ~ 0.30%, Ti 0.010% ~ 0.050%, P≤0.020%, S≤0.010%, Alt 0.010% ~ 0.050%, after molten steel composition reaches above-mentioned target call, feed calcium line 400m～800m, 5～10 minutes soft blow argon time, refining finishes, molten steel is delivered to continuous casting workshop to carry out continuous casting and becomes slab, 1500 ℃～1525 ℃ of tundish temperatures,
(2) heating process: with heating of plate blank to 1190 ~ 1250 ℃, heating total time is controlled by 0.7 ~ 1.0 minute/mm;
(3) rolling technology: use the heated slab of hot continuous mill controlled rolling, coil into steel band, hot continuous rolling finishing temperature scope is 850 ℃～920 ℃, and the coiling temperature scope is 640 ℃～720 ℃;
(4) roll rear process for cooling: the steel band after hot rolling adopts to concentrate stacks air cooling, obtains ferrite+pearlitic matrix body tissue.
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| CN103160635B (en) * | 2013-04-03 | 2014-11-26 | 河北文丰钢铁有限公司 | Process for producing die steel by utilizing converter continuous casting mode |
| CN109266965A (en) * | 2018-11-01 | 2019-01-25 | 宁波钢铁有限公司 | A kind of hot rolled strip and its preparation and application |
| CN113528937A (en) * | 2021-06-09 | 2021-10-22 | 南京钢铁股份有限公司 | Economical steel for hardware tools and manufacturing method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008214650A (en) * | 2007-02-28 | 2008-09-18 | Jfe Steel Kk | Hot-rolled steel plate for die quench and manufacturing method therefor |
| JP2009235499A (en) * | 2008-03-27 | 2009-10-15 | Nisshin Steel Co Ltd | Method for manufacturing hollow stabilizer |
| CN101773929A (en) * | 2010-01-20 | 2010-07-14 | 广州珠江钢铁有限责任公司 | Method for producing 30CrMo hot rolled steel plate |
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| CN101967606A (en) * | 2010-11-02 | 2011-02-09 | 武汉钢铁(集团)公司 | Hot rolled steel strip for straight slit electric resistance welding petroleum casing pipe and production method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008214650A (en) * | 2007-02-28 | 2008-09-18 | Jfe Steel Kk | Hot-rolled steel plate for die quench and manufacturing method therefor |
| JP2009235499A (en) * | 2008-03-27 | 2009-10-15 | Nisshin Steel Co Ltd | Method for manufacturing hollow stabilizer |
| CN101773929A (en) * | 2010-01-20 | 2010-07-14 | 广州珠江钢铁有限责任公司 | Method for producing 30CrMo hot rolled steel plate |
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Effective date of registration: 20160729 Address after: 338001 Xinyu metallurgy Road, Jiangxi, No. 1 Patentee after: Xinyu Iron & Steel Co., Ltd. Address before: 338001 Xinyu metallurgy Road, Jiangxi, No. 1 Patentee before: Xinyu Iron & Steel Co., Ltd. |