CN1824818A - Cold extruding die steel and heat treatment technique thereof - Google Patents
Cold extruding die steel and heat treatment technique thereof Download PDFInfo
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- CN1824818A CN1824818A CN 200610049262 CN200610049262A CN1824818A CN 1824818 A CN1824818 A CN 1824818A CN 200610049262 CN200610049262 CN 200610049262 CN 200610049262 A CN200610049262 A CN 200610049262A CN 1824818 A CN1824818 A CN 1824818A
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Abstract
This invention relates to a new style alloy tool steel, especially relates to a new style cold extrusion die steal and its heat treatment technique. The weight percentage of the elements is that carbon 0.75-10.5%, chrome 7.3-8.5%, molybdenum 1.2-2.0%, vanadium 0.3-0.9%, nickel 0.3-0.9%, tungsten 1.2-2.0%, silicon 0.1-1.0%, manganese 0.1-0.4%, sulfur not more than 0.015%, phosphor not more than 0.02%, the rest is iron. Compared to home made die steel, the carbon and silicon content is reduced, and the molybdenum content is also reduced, the toughness and wear resistance of the alloy steel in this invention is increased, and the hardenability and synthetic mechanicalness is greatly improved, especially the low temperature impact toughness is great high. It can make fine die, and its using life is long, and the cost is reduced. This product in this invention is the most ideal material used for more than 300 tons cold extrusion die, and it can be widely used as cold extrusion die for stainless steel furnace butt and automobile door. This invention also provides the heat treating technique of the die steel.
Description
Technical field
The present invention relates to a kind of novel alloy tool steel, relate in particular to a kind of novel cold extruded die steel and thermal treatment process thereof.
Background technology
Compression molding has become production, especially the main processing means of household electrical appliances, daily necessities.The working conditions of mould reaches performance demands is varied, thereby selects different steel classes for use at different service conditions.Performance-the price of die steel is than being the parameter of weighing its economic benefit, and cold extrusion die also requires high as far as possible obdurability except that requiring the crushing resistance close with other cold-working moulds (being hardness).For processing the mould that high-strength material requires high life (big as far as possible punching press number of packages) simultaneously again, also need certain fatigue resistance.
Be used for the general homemade die steel Cr8Mo2V1Si of employing of die steel material and the similar Japanese DC-53 of cold extrusion die, Austrian K340 steel is done in the past, and the composition of these several alloys is roughly: C1.1%, Cr8.3%, Mo2.1%, Si0.9%, Mn0.4%, V0.5%.Some mould need push high-intensity material, requires long service life again, and these type of steel are because charcoal silicone content height, and quenching hardness is HRC57～59, if be used for cold extrusion shaped mould more than 300 tons, plasticity, toughness are not enough, easily split mould, can't satisfy above-mentioned requirements.Simultaneously, this steel alloy contains more high-load Mo, now owing to Mo on the world market lacks, and the price comparison costliness, the cost of therefore producing alloy is higher.
It is C:0.5～0.65% that Chinese invention patent ZL02100041 discloses a kind of high-strength tough cold extruded die steel composition range, Cr:4.5～5.5%, Mo:1.0～2.0%, W:0.2～0.8%, V:0.40～0.80%, Si:0.30～0.60%, Mn≤0.40%, S.P≤0.30%, RE rare earth element≤0.30%, above numeral is weight percentage, and surplus is an iron.The advantage of this invention is: be used for (two class are divided in HRC57～62) cold extruding die of Stainless Steel Watch Band element, watchcase etc. with quenching-Annealed Strip, mould increases than the mean lifetime of the homemade Cr12MoV of former usefulness.The plasticity and the toughness of this alloy are not enough, require height and during the homogeneous mechanical performance, this alloy can't meet the demands for big section workpiece.
Chinese invention patent (publication number is CN1166533) discloses a kind of novel Ledeburite-less high-alloy cold-working die steel, its composition is: C0.4～1.4%, Cr7.0～10.0%, Mo1.0～2.0%, V2.0～8.0%, because carbon content is low, thus when the ingot casting condensation, do not form the Lai Shi eutectic, thereby do not have carbide segregation and thick carbide.About HRC55, textura epidermoidea and hardness and famous powder cold-work die steel V-4, V-10 are suitable through specific thermal treatment (comprising controlled no inner oxidation over-carburizing, low temperature quenching and low-temperaturetempering) back centre hardness.This steel alloy contains more high-load V, so production cost is also higher.Simultaneously, require height for big section workpiece and during the homogeneous mechanical performance, this alloy also can't meet the demands.
Summary of the invention
In order to solve above-mentioned technological deficiency, the purpose of this invention is to provide a kind of replaced C r
8Mo
2V
1Si also has enough toughness and wear resistance after quenching, can make more than 300 tons, long service life, the novel cold extruded die steel that production cost is low.
Second purpose of the present invention provides the thermal treatment process of above-mentioned novel cold extruded die steel.
In order to reach first above-mentioned goal of the invention, the present invention has adopted following technical scheme:
A kind of novel cold extruded die steel, this die steel comprises by weight percentage: carbon C0.75～10.5%, chromium Cr7.3～8.5%, molybdenum Mo1.2～2.0%, vanadium V0.3～0.9%, nickel 0.3～0.9%, tungsten W0.3～1.3%, silicon Si0.1～1.0%, manganese Mn0.1～0.4%, sulphur S≤0.015%, phosphorus P≤0.02%, its surplus is iron Fe.
As preferably, this die steel comprises by weight percentage: carbon C0.75～0.85%, chromium Cr7.3～8.3%, molybdenum Mo1.2～2.0%, vanadium V0.3～0.9%, nickel 0.3～0.9%, tungsten W0.3～1.1%, silicon Si0.1～0.4%, manganese Mn0.1～0.4%, sulphur S≤0.015%, phosphorus P≤0.02%, its surplus is iron Fe.
As most preferably, this die steel comprises by weight percentage: carbon C0.8%, and chromium Cr7.8%, molybdenum Mo1.5%, vanadium V0.5%, nickel 0.6%, tungsten W0.6%, silicon Si0.2%, manganese Mn0.2%, sulphur S≤0.015%, phosphorus P≤0.02%, its surplus is iron Fe.
As preferably, this die steel also comprises: the niobium below 0.3%.
As preferably, this die steel also comprises: the titanium below 0.3%.
As preferably, this die steel also comprises: the rare earth element below 0.05%.
In order to realize second purpose of the present invention, the thermal treatment process of novel cold extruded die steel of the present invention may further comprise the steps:
(1), preheating for the first time, the thermal pretreatment temperature is at 500～650 ℃, the thermal pretreatment time is 45～60 minutes;
(2), preheating for the second time, the thermal pretreatment temperature is at 800～900 ℃, the thermal pretreatment time is 45～60 minutes;
(3), the heating of quenching, quenching temperature is 1010～1050 ℃, adopts oil cooling or air cooling or salt bath 200～250 ℃ of warm wash that cool;
(4), tempering, tempering temperature is 180～250 ℃, air cooling is to room temperature then.
As preferably, adopt the oil cooling cooling in the step (3), drop to 200～250 ℃ of warm wash in temperature.
As preferably, adopt the salt bath cooling in the step (3), drop to 450～500 ℃ of time stage insulations in temperature, cool to 200～250 ℃ of warm wash then.
As preferably, the tempering cooling is carried out temper later once more, and air cooling is to room temperature then.
What the main composition range of the present invention was determined the reasons are as follows:
Carbon, the various carbide that it and carbide forming element form are vital tissue factors that steel obtains hot strength.An amount of superfluous carbide can stop grain growth, improves wear resistance.But carbon content is too high, can make steel lose plasticity, because carbide is too much, skewness can cause that also mould bursts apart in addition.The suitable content of carbon of the present invention is 0.75～1.05%.
Silicon its objective is the hardening capacity, temper resistance and the matrix strength that improve steel, guarantee hot strength, hot hardness and the thermostability of steel, but excessive silicon can reduce the plasticity and the toughness of material, and the suitable content of silicon of the present invention is 0.1～1.0%.
Manganese its objective is the hardening capacity that improves steel, eliminates the harmful effect that sulphur exists simultaneously, and the suitable content of manganese of the present invention is 0.1～0.4%.
Chromium, main effect is hardening capacity and the oxidation-resistance that improves steel, and chromium is a kind of intensive carbide forming element, and it can form multiple compound with carbon, and forms the compound compound with iron carbon, but too high chromium content impairs the hot strength of steel.The suitable content of chromium of the present invention is 7.3～8.5%.
Vanadium, molybdenum, tungsten are the strong carbide forming element.Adding vanadium 0.3～0.9% can prevent the thermo-responsive tendency of mistake of steel, improves the hot hardness and the hot strength of steel.Add tungsten 0.3～1.3% and play the effect that improves heat resistance, add molybdenum Mo1.2～2.0% and can improve hardening capacity and heat resistance.The adding of tungsten, molybdenum has also reduced the adding owing to nickel simultaneously, and makes material production temper brittleness tendency.
Nickel is non-carbide forming element, improves the intensity of steel by the solution strengthening mode, simultaneously plasticity is also had improvement.Simultaneously, add the critical quenching rate that nickel can reduce steel, thereby the hardening capacity of steel is improved greatly.Chromium nickel coexists in the steel, can improve the comprehensive mechanical performance of steel greatly.The suitable content of nickel of the present invention is 0.3～0.9%.
Niobium, it is the carbide forming element also stronger than vanadium.A spot of niobium mainly exists with the form of niobium carbide in the steel.Can stop austenite crystal to be grown up, thereby improve toughness, improve hot worked processing performance.The present invention adopts the niobium below 0.3%.
Titanium can improve wear resisting property.The present invention adopts the titanium below 0.3%.
Rare earth, to the antioxidant property that improves alloy, tangible effect is arranged, in addition, rare earth also has directly and improves FATIGUE CRACK GROWTH.The present invention adopts the rare earth element below 0.05%.
Sulphur S of the present invention≤0.015%, phosphorus P≤0.02%, the purity height of steel alloy, the anti-fatigue performance of steel alloy and other mechanical propertys are all very good.
Alloy steel material of the present invention and homemade die steel Cr
8Mo
2V
1The Si ratio reduces the also corresponding reduction of molybdenum content to carbon, silicone content, increase a spot of tungsten and nickel, both increased toughness and wear resistance, improved hardening capacity and comprehensive mechanical greatly, particularly cryogenic impelling strength is quite high, can make meticulous mould, long service life, has reduced production cost again.Through user's use in a few years, this steel is to be used for the ideal material of the above cold extrusion die of 300 tonnages, is widely used in the cold extrusion die of Stainless Steel Watch base and automobile valve.
Description of drawings
Fig. 1 is the novel cold extruded die steel heat treatment cycle curve of the present invention figure.
Fig. 2 is the novel cold extruded die steel tempering curve of the present invention figure.
Embodiment
Embodiment 1
A kind of novel cold extruded die steel, this die steel comprises by weight percentage: carbon C0.8%, chromium Cr7.8%, molybdenum Mo1.5%, vanadium V0.5%, nickel 0.6%, tungsten W0.6%, silicon Si0.2%, manganese Mn0.2%, niobium 0.3%, titanium 0.3%, rare earth element 0.05%, sulphur S≤0.015%, phosphorus P≤0.02%, its surplus is iron Fe.
Above-mentioned novel cold extrusion die steel heat treatment process, can adopt following steps to carry out:
(1), for the first time preheat, temperature is 600 ℃, and the time of preheating is 45 minutes;
(2), for the second time preheat, temperature is 850 ℃, and the time of preheating is 45 minutes;
(3), the heating of quenching, quenching temperature is 1010～1050 ℃, the cool time is: 25+ material thickness/2 (minute), oil cooling to 200～250 ℃ warm wash then;
(4), tempering for the first time, tempering temperature is 200 ℃, tempering time is 2 hours, air cooling is to room temperature then;
(5), tempering for the second time, tempering temperature is 200 ℃, tempering time is 2 hours, air cooling is to room temperature then;
(6), tempering for the third time, tempering temperature is 200 ℃, tempering time is 2 hours, air cooling is to room temperature then.
Embodiment 2
A kind of novel cold extruded die steel, this die steel comprises by weight percentage: carbon C0.75%, chromium Cr7.3%, molybdenum Mo1.2%, vanadium V0.3%, nickel 0.3%, tungsten W0.4%, silicon Si0.1%, manganese Mn0.1%, niobium 0.3%, titanium 0.3%, rare earth element 0.05%, sulphur S≤0.015%, phosphorus P≤0.02%, its surplus is iron Fe.
Above-mentioned novel cold extrusion die steel heat treatment process, can adopt following steps to carry out:
(1), for the first time preheat, temperature is 600 ℃, and the time of preheating is 45 minutes;
(2), for the second time preheat, temperature is 850 ℃, and the time of preheating is 45 minutes;
(3), the heating of quenching, quenching temperature is 1010～1050 ℃, the cool time is: 25+ material thickness/2 (minute), salt bath cooling then drops to 500 ℃ of time stages insulations in temperature, cools to 200～250 ℃ of warm wash then;
(4), tempering for the first time, tempering temperature is 200 ℃, tempering time is 2 hours, air cooling is to room temperature then;
(5), tempering for the second time, tempering temperature is 200 ℃, tempering time is 2 hours, air cooling is to room temperature then;
(6), tempering for the third time, tempering temperature is 200 ℃, tempering time is 2 hours, air cooling is to room temperature then.
Embodiment 3
A kind of novel cold extruded die steel, this die steel comprises by weight percentage: carbon C0.85%, chromium Cr8.3%, molybdenum Mo2.0%, vanadium V0.9%, nickel 0.9%, tungsten W1.1%, silicon Si0.4%, manganese Mn0.4%, niobium 0.3%, titanium 0.3%, rare earth element 0.05%, sulphur S≤0.015%, phosphorus P≤0.02%, its surplus is iron Fe.
Above-mentioned novel cold extrusion die steel heat treatment process, can adopt following steps to carry out:
(1), for the first time preheat, temperature is 600 ℃, and the time of preheating is 45 minutes;
(2), for the second time preheat, temperature is 850 ℃, and the time of preheating is 45 minutes;
(3), the heating of quenching, quenching temperature is 1010～1050 ℃, the cool time is: 25+ material thickness/2 (minute), air cooling then;
(4), tempering for the first time, tempering temperature is 200 ℃, tempering time is 2 hours, air cooling is to room temperature then;
(5), tempering for the second time, tempering temperature is 200 ℃, tempering time is 2 hours, air cooling is to room temperature then;
(6), tempering for the third time, tempering temperature is 200 ℃, tempering time is 2 hours, air cooling is to room temperature then.
Claims (10)
1. novel cold extruded die steel, it is characterized in that this die steel comprises by weight percentage: carbon C0.75～1.05%, chromium Cr7.3～8.5%, molybdenum Mo1.2～2.0%, vanadium V0.3～0.9%, nickel 0.3～0.9%, tungsten W0.3～1.3%, silicon Si0.1～1.0%, manganese Mn0.1～0.4%, sulphur S≤0.015%, phosphorus P≤0.02%, its surplus is iron Fe.
2. a kind of novel cold extruded die steel as claimed in claim 1, it is characterized in that this die steel comprises by weight percentage: carbon C0.75～0.85%, chromium Cr7.3～8.3%, molybdenum Mo1.2～2.0%, vanadium V0.3～0.9%, nickel 0.3～0.9%, tungsten W0.3～1.1%, silicon Si0.1～0.4%, manganese Mn0.1～0.4%, sulphur S≤0.015%, phosphorus P≤0.02%, its surplus is iron Fe.
3. a kind of novel cold extruded die steel as claimed in claim 1, it is characterized in that this die steel comprises by weight percentage: carbon C0.8%, chromium Cr7.8%, molybdenum Mo1.5%, vanadium V0.5%, nickel 0.6%, tungsten W0.6%, silicon Si0.2%, manganese Mn0.2%, sulphur S≤0.015%, phosphorus P≤0.02%, its surplus is iron Fe.
4. as claim 1 or 2 or 3 described a kind of novel cold extruded die steels, it is characterized in that this die steel also comprises: the niobium below 0.3%.
5. as claim 1 or 2 or 3 described a kind of novel cold extruded die steels, it is characterized in that this die steel also comprises: the titanium below 0.3%.
6. as claim 1 or 2 or 3 described a kind of novel cold extruded die steels, it is characterized in that this die steel also comprises: the rare earth element below 0.05%.
7. the thermal treatment process of novel cold extruded die steel as claimed in claim 1 is characterized in that may further comprise the steps:
(1), preheating for the first time, the thermal pretreatment temperature is at 500～650 ℃, the thermal pretreatment time is 45～60 minutes;
(2), preheating for the second time, the thermal pretreatment temperature is at 800～900 ℃, the thermal pretreatment time is 45～60 minutes;
(3), the heating of quenching, quenching temperature is 1010～1050 ℃, adopts oil cooling or air cooling or salt bath 200～250 ℃ of warm wash that cool;
(4), tempering, tempering temperature is 180～250 ℃, air cooling is to room temperature then.
8. the thermal treatment process of new die steel as claimed in claim 7 is characterized in that adopting the oil cooling cooling in the step (3), drops to 200～250 ℃ of warm wash in temperature.
9. the thermal treatment process of new die steel as claimed in claim 7 is characterized in that adopting in the step (3) the salt bath cooling, drops to 450～500 ℃ of time stage insulations in temperature, cools to 200～250 ℃ of warm wash then.
10. the thermal treatment process of novel cold extruded die steel as claimed in claim 7 is characterized in that carrying out temper once more after the tempering cooling, and air cooling is to room temperature then.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103233187A (en) * | 2013-05-28 | 2013-08-07 | 滁州迪蒙德模具制造有限公司 | Steel for cold working die and production method thereof |
| CN105382413A (en) * | 2015-12-23 | 2016-03-09 | 江苏启澜激光科技有限公司 | Industrial laser cutting machine |
| CN106119480A (en) * | 2016-06-24 | 2016-11-16 | 相城区黄桥荣翔金属制品厂 | A kind of handware high temperature preheating Technology for Heating Processing |
| CN107058686A (en) * | 2017-04-12 | 2017-08-18 | 滁州市东华模具制造有限公司 | A kind of die ＆ mold treatment technique for preventing cold punching die to fail |
| CN107419072A (en) * | 2017-07-18 | 2017-12-01 | 广州市恒上钟表配件有限公司 | The heat treatment method and cold extrusion die of a kind of cold extrusion die |
| TWI633193B (en) * | 2014-03-07 | 2018-08-21 | 大同特殊鋼股份有限公司 | Steel for mold |
| CN109097531A (en) * | 2018-10-08 | 2018-12-28 | 河南精诚汽车零部件有限公司 | A kind of heat treatment process of cold shearing mold |
| CN110284078A (en) * | 2019-07-04 | 2019-09-27 | 阳江市阳东天戟造刀有限公司 | A kind of martensitic stain less steel cutter and heat treatment method |
| CN110541122A (en) * | 2019-10-24 | 2019-12-06 | 东莞市中瑞金属材料有限公司 | novel alloy steel and manufacturing process thereof |
| CN111876666A (en) * | 2020-06-24 | 2020-11-03 | 如皋市宏茂铸钢有限公司 | Boron microalloyed die steel and preparation process thereof |
| CN112501403A (en) * | 2020-11-30 | 2021-03-16 | 湖北欣汇金属制品有限公司 | Cold-work die steel surface super-hardening treatment process |
| CN113718170A (en) * | 2021-06-24 | 2021-11-30 | 上海双舜科技发展有限公司 | Cold-work die steel material and manufacturing process thereof |
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2006
- 2006-01-25 CN CNB2006100492622A patent/CN100491576C/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103233187A (en) * | 2013-05-28 | 2013-08-07 | 滁州迪蒙德模具制造有限公司 | Steel for cold working die and production method thereof |
| TWI633193B (en) * | 2014-03-07 | 2018-08-21 | 大同特殊鋼股份有限公司 | Steel for mold |
| CN105382413A (en) * | 2015-12-23 | 2016-03-09 | 江苏启澜激光科技有限公司 | Industrial laser cutting machine |
| CN106119480A (en) * | 2016-06-24 | 2016-11-16 | 相城区黄桥荣翔金属制品厂 | A kind of handware high temperature preheating Technology for Heating Processing |
| CN107058686A (en) * | 2017-04-12 | 2017-08-18 | 滁州市东华模具制造有限公司 | A kind of die ＆ mold treatment technique for preventing cold punching die to fail |
| CN107419072A (en) * | 2017-07-18 | 2017-12-01 | 广州市恒上钟表配件有限公司 | The heat treatment method and cold extrusion die of a kind of cold extrusion die |
| CN109097531A (en) * | 2018-10-08 | 2018-12-28 | 河南精诚汽车零部件有限公司 | A kind of heat treatment process of cold shearing mold |
| CN110284078A (en) * | 2019-07-04 | 2019-09-27 | 阳江市阳东天戟造刀有限公司 | A kind of martensitic stain less steel cutter and heat treatment method |
| CN110541122A (en) * | 2019-10-24 | 2019-12-06 | 东莞市中瑞金属材料有限公司 | novel alloy steel and manufacturing process thereof |
| CN111876666A (en) * | 2020-06-24 | 2020-11-03 | 如皋市宏茂铸钢有限公司 | Boron microalloyed die steel and preparation process thereof |
| CN112501403A (en) * | 2020-11-30 | 2021-03-16 | 湖北欣汇金属制品有限公司 | Cold-work die steel surface super-hardening treatment process |
| CN113718170A (en) * | 2021-06-24 | 2021-11-30 | 上海双舜科技发展有限公司 | Cold-work die steel material and manufacturing process thereof |
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