CN103789643A - Preparation method of stainless steel for cutters - Google Patents
Preparation method of stainless steel for cutters Download PDFInfo
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- CN103789643A CN103789643A CN201210421227.4A CN201210421227A CN103789643A CN 103789643 A CN103789643 A CN 103789643A CN 201210421227 A CN201210421227 A CN 201210421227A CN 103789643 A CN103789643 A CN 103789643A
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Abstract
The invention discloses a preparation method of stainless steel for cutters. The stainless steel is composed of C, Si, Mn, Cr, Ti, B, P, S and Fe. The preparation method comprises the following steps: 1, smelting; 2, blooming: heating a slab to 1260-1300DEG C, and fully austenitizing, wherein the blooming temperature is controlled in a range of 1220-1240DEG C, and the reduction per pass is controlled in a range of 15-30%; 3, finishing rolling, wherein the rolling temperature is controlled in a range of 920-960DEG C, the final rolling temperature is controlled in a range of 800-900DEG C, the cumulative reduction of last three passes is 35-55%; and 4, heat treatment, quenching at 1140-1160DEG C, carrying out heat insulation for 2-3h, carrying out water cooling of the above obtained steel plate to below martensite point Ms at a cooling rate of 15-30DEG C/s, carrying out low temperature tempering at 180-220DEG C for 3-4h, and carrying out air cooling to room temperature.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy, relate in particular to a kind of preparation method of Cutlery Stainless Steel.
Background technology
Stainless material has non-corrosive, feature durable, attractive in appearance, is widely used in making knife for kitchen, scissors and surgical knife tool by cutter manufacturing enterprise.But conventional stainless material hardness is low, wear resistance is not ideal enough, and keen edge degree is poor and the hold-time is short.Along with expanding economy, people's living standard improve, people have higher requirement to cutting performance, therefore, also have a lot of people at positive research and development cutter material.
The patent No. is that the Chinese invention patent specification sheets of ZL01126989.8 discloses a kind of Cu alloy material that is applicable to cutter, is made up of Cu, Zn, Sn, wherein consists of by the weight proportion of each raw material: 60～90%Cu, 5～20%Zn, all the other are metal Sn.This alloy material anticorrosive wear-resistant, is exclusively used in and makes food food and drink class cutter, comprises the vegetable knife, fruit knife, prepared food cutter of all size etc.Number of patent application is that 200710011128.8 Chinese invention patent application prospectus has been introduced a kind of special steel for knife tool, the weight percent of its each composition is: 0.85～0.95%C, 0.4～0.5%Si, 0.4～0.5%Mn, P≤0.03%, S≤0.02%, 14.5～15.5%Cr, 0.4～0.6%Mo, 0.2～0.3%V, all the other are Fe and inevitable trace impurity, and this invention improves intensity and the hardness of steel by improving the content of carbon in material.
In above technology, the former document is recorded Cu alloy material take copper as matrix, and production cost is high, and hot workability is poor, need to adopt powder metallurgy process manufacture, and complex process, production efficiency are low.The stainless material that the latter's document is introduced is for improving hardness, having added massfraction is more than 0.7% C, but facts have proved that in stainless steel, adding C content exceedes 0.7% and just become hypereutectoid steel, thick fragility eutectic carbides will be formed, make steel add man-hour easy to crack, and very easily chipping while making cutter; And the Cr content of this material is low, can not meet the desired minimum 12%Cr content of stainless steel, its solidity to corrosion is poor, easily get rusty, and also needs the sub-zero treatment through-80 ℃ after quenching, cutter unrelieved stress is high, it is large, easy to crack to be out of shape, and situ production is also difficult to realize.
Summary of the invention
The object of the invention is to propose a kind of preparation method of Cutlery Stainless Steel, stainless steel intensity prepared by the method is high, good toughness, excellent in abrasion resistance, and hardness is higher, suitablely produces as cutter.
For reaching this object, the present invention by the following technical solutions:
A kind of preparation method of Cutlery Stainless Steel, described stainless steel is made up of following component by weight percentage: C 0.40～0.50%, Si0.60～0.80%, Mn 1.20～1.40%, Cr 14.0～16.0%, Ti0.05～0.07%, B 0.006～0.008%, P≤0.020%, S≤0.015%, all the other are Fe and inevitable impurity; Described preparation method comprises the steps:
1) smelt: adopt desulfurizing iron, converter top bottom blowing, RH Fruit storage, whole process protection pours into slab;
2) breaking down: by heating of plate blank to 1260～1300 ℃ also abundant austenitizing; Its start rolling temperature is controlled at 1220～1240 ℃, every time draft and is controlled at 15～30%;
3) finish rolling: its start rolling temperature is controlled at 920～960 ℃, finishing temperature and is controlled at 800～900 ℃, last three passages accumulative total drafts 35～55%;
4) thermal treatment: quenching temperature is controlled at 1140～1160 ℃, insulation, and its soaking time is 2～3 hours; With the speed of cooling of 15～30 ℃/s by steel plate with being water-cooled to below martensite point Ms; Low-temperaturetempering: heating and temperature control is at 180～220 ℃, and soaking time is 3～4 hours; Air cooling is to room temperature.
The function and mechanism of the each element of the present invention:
Carbon is one of element of indispensable raising steel strength and hardness in steel, and this steel grade needs extraordinary hardness to guarantee the wear resistance of steel plate, and therefore, higher carbon content is absolutely necessary.But in steel, the too high steel toughness that easily causes of carbon content declines, and causes steel welding property poor.Therefore, in order to guarantee that steel plate has high hardness, preferably toughness, good cold formability and welding property, is limited to 0.40～0.50% by carbon content.
Silicon can be dissolved in the hardness and the intensity that in ferrite and austenite, improve steel, and silicon can make C curve move to right, and improves the hardening capacity of steel.This steel grade intensity and hardness requirement are higher, must add higher element silicon and guarantee.
Manganese can form sosoloid with iron, improves ferrite and austenitic hardness and intensity in steel; Manganese is well stable austenite tissue of energy simultaneously, further strengthens the hardening capacity of steel; When manganese also can make steel be produced distortion impacting, make steel surface layer be strengthened and there is high wear resistance; Manganese and sulphur form the MnS that fusing point is higher, can effectively prevent the hot-short phenomenon that the generation of FeS causes.
Chromium (Cr) is stainless principal element, its content need just have antirust ability completely higher than 13%, Cr content is high, solidity to corrosion is high, but content Gao Shiyi forms the intermetallic compound of fragility Cr, therefore Cr content target value is controlled in 14.0～16.0% scopes.
Titanium (Ti) is in order to form tiny TiC second phase particles, and grain growth while stoping steel heating guarantees structure refinement in steel, improves obdurability, suppresses Cr simultaneously
23c
6carbide is separating out on crystal boundary in steel, reduces stainless Susceptibility To Intergranular Corrosion.
The object that adds B is mainly the hardening capacity that increases steel, thereby saves other rarer valuable metals.Boron is to strengthen one of the most effective element of steel hardenability, but mainly by effective boron (there is crystal gap, and not with the boron of other element chemical combination) realize.
The present invention requires P≤0.020% and S≤0.015%: phosphorus has disadvantageous effects such as easily causing segregation, deterioration welding property, the low-temperature impact toughness that significantly reduces steel, raising brittle transition temperature in steel.The easy generation MnS of being combined with manganese of sulphur is mingled with, and sulphur also affects the low-temperature impact toughness of steel.Therefore, the present invention should reduce phosphorus, the disadvantageous effect of element sulphur to rigidity energy as far as possible, by molten iron being carried out to the means such as dark desulfurization pre-treatment, vacuum-treat, controls phosphorus, sulphur content, thereby alleviates its disadvantageous effect.
Compared with prior art, its excellent effect is in the present invention:
1) alloying constituent is simple, and precious alloy element adds less, and production technique is simple simultaneously, and lumber recovery and properties percent of pass are high, make production cost lower, have good economic benefit and social benefit;
2) prepared stainless steel good mechanical performance, intensity, hardness are high, have certain toughness, and hardening capacity is good, and wear resistance is good, meets user's service requirements completely; Through evidence, steel of the present invention has high rigidity, high tenacity and good erosion resistance, is applicable to manufacture knife for kitchen, scissors and scalpel.
Embodiment
Embodiment mono-
A kind of preparation method of Cutlery Stainless Steel, described stainless steel is made up of following component by weight percentage: C 0.40%, Si 0.80%, Mn 1.20%, Cr16.0%, Ti 0.05%, B 0.008%, P≤0.020%, S≤0.015%, all the other are Fe and inevitable impurity; Described preparation method comprises the steps:
1) smelt: adopt desulfurizing iron, converter top bottom blowing, RH Fruit storage, whole process protection pours into slab;
2) breaking down: by heating of plate blank to 1260 ℃ also abundant austenitizing; Its start rolling temperature is controlled at 1240 ℃, every time draft and is controlled at 15%;
3) finish rolling: its start rolling temperature is controlled at 920 ℃, finishing temperature and is controlled at 900 ℃, last three passages accumulative total drafts 35%;
4) thermal treatment: quenching temperature is controlled at 1140 ℃, insulation, and its soaking time is 3 hours; With the speed of cooling of 15 ℃/s by steel plate with being water-cooled to below martensite point Ms; Low-temperaturetempering: heating and temperature control is at 220 ℃, and soaking time is 3 hours; Air cooling is to room temperature.
Embodiment bis-
A kind of preparation method of Cutlery Stainless Steel, described stainless steel is made up of following component by weight percentage: C 0.50%, Si 0.60%, Mn 1.40%, Cr 14.0%, Ti 0.07%, B 0.006%, P≤0.020%, S≤0.015%, all the other are Fe and inevitable impurity; Described preparation method comprises the steps:
1) smelt: adopt desulfurizing iron, converter top bottom blowing, RH Fruit storage, whole process protection pours into slab;
2) breaking down: by heating of plate blank to 1300 ℃ also abundant austenitizing; Its start rolling temperature is controlled at 1220 ℃, every time draft and is controlled at 30%;
3) finish rolling: its start rolling temperature is controlled at 960 ℃, finishing temperature and is controlled at 800 ℃, last three passages accumulative total drafts 55%;
4) thermal treatment: quenching temperature is controlled at 1160 ℃, insulation, and its soaking time is 2 hours; With the speed of cooling of 30 ℃/s by steel plate with being water-cooled to below martensite point Ms; Low-temperaturetempering: heating and temperature control is at 180 ℃, and soaking time is 4 hours; Air cooling is to room temperature.
Embodiment tri-
A kind of preparation method of Cutlery Stainless Steel, described stainless steel is made up of following component by weight percentage: C 0.45%, Si 0.70%, Mn 1.30%, Cr 15.0%, Ti 0.06%, B 0.007%, P≤0.020%, S≤0.015%, all the other are Fe and inevitable impurity; Described preparation method comprises the steps:
1) smelt: adopt desulfurizing iron, converter top bottom blowing, RH Fruit storage, whole process protection pours into slab;
2) breaking down: by heating of plate blank to 1280 ℃ also abundant austenitizing; Its start rolling temperature is controlled at 1230 ℃, every time draft and is controlled at 25%;
3) finish rolling: its start rolling temperature is controlled at 940 ℃, finishing temperature and is controlled at 850 ℃, last three passages accumulative total drafts 45%;
4) thermal treatment: quenching temperature is controlled at 1150 ℃, insulation, and its soaking time is 2.5 hours; With the speed of cooling of 20 ℃/s by steel plate with being water-cooled to below martensite point Ms; Low-temperaturetempering: heating and temperature control is at 200 ℃, and soaking time is 3.5 hours; Air cooling is to room temperature.
Claims (1)
1. the preparation method of a Cutlery Stainless Steel, it is characterized in that, described stainless steel is made up of following component by weight percentage: C 0.40～0.50%, Si0.60～0.80%, Mn 1.20～1.40%, Cr 14.0～16.0%, Ti0.05～0.07%, B 0.006～0.008%, P≤0.020%, S≤0.015%, all the other are Fe and inevitable impurity; Described preparation method comprises the steps:
1) smelt: adopt desulfurizing iron, converter top bottom blowing, RH Fruit storage, whole process protection pours into slab;
2) breaking down: by heating of plate blank to 1260～1300 ℃ also abundant austenitizing; Its start rolling temperature is controlled at 1220～1240 ℃, every time draft and is controlled at 15～30%;
3) finish rolling: its start rolling temperature is controlled at 920～960 ℃, finishing temperature and is controlled at 800～900 ℃, last three passages accumulative total drafts 35～55%;
4) thermal treatment: quenching temperature is controlled at 1140～1160 ℃, insulation, and its soaking time is 2～3 hours; With the speed of cooling of 15～30 ℃/s by steel plate with being water-cooled to below martensite point Ms; Low-temperaturetempering: heating and temperature control is at 180～220 ℃, and soaking time is 3～4 hours; Air cooling is to room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210421227.4A CN103789643A (en) | 2012-10-29 | 2012-10-29 | Preparation method of stainless steel for cutters |
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| CN201210421227.4A CN103789643A (en) | 2012-10-29 | 2012-10-29 | Preparation method of stainless steel for cutters |
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| CN103789643A true CN103789643A (en) | 2014-05-14 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107470357A (en) * | 2017-09-07 | 2017-12-15 | 东南大学 | A kind of low carbon steel rolling and control cooling means |
| CN107723447A (en) * | 2017-10-12 | 2018-02-23 | 徐州东鹏工具制造有限公司 | A kind of stainless steel blade Technology for Heating Processing |
-
2012
- 2012-10-29 CN CN201210421227.4A patent/CN103789643A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107470357A (en) * | 2017-09-07 | 2017-12-15 | 东南大学 | A kind of low carbon steel rolling and control cooling means |
| CN107723447A (en) * | 2017-10-12 | 2018-02-23 | 徐州东鹏工具制造有限公司 | A kind of stainless steel blade Technology for Heating Processing |
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Application publication date: 20140514 |