CN100447284C - Chromium steel series cold extruding die steel and heat treatment technique thereof - Google Patents
Chromium steel series cold extruding die steel and heat treatment technique thereof Download PDFInfo
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- CN100447284C CN100447284C CNB2006100492603A CN200610049260A CN100447284C CN 100447284 C CN100447284 C CN 100447284C CN B2006100492603 A CNB2006100492603 A CN B2006100492603A CN 200610049260 A CN200610049260 A CN 200610049260A CN 100447284 C CN100447284 C CN 100447284C
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Abstract
The present invention relates to novel alloy tool steel, particularly to novel chromium steel series cold extruding die steel and a heat treatment technology thereof. The novel chrome steel series cold extruding die steel contains chemical components measured by weight percentage: 0.8 to 1.05% of carbon, 7.3 to 8.5% of chromium, 1.2 to 2.0% of molybdenum, 0.3 to 0.9 % of vanadium, 0.3 to 0.9 % of nickel, 1.2 to 2.0% of tungsten, 0.1 to 1.0 % of silicon, 0.1 to 0.4 % of manganese, at most 0.015% of sulfur, at most 0.02% of phosphorus and Fe as the rest. Compared with die steel Cr8Mo2V1Si made in China, the alloy steel material of the present invention has increased toughness and wear resistance and greatly improved hardenability and comprehensive mechanical properties. In particular, low temperature dynamic ductility is quite high, and the alloy tool steel can be produced into fine moulds and has the advantages of long service life and reduced productive cost. The present invention is suitable for producing fine cutting moulds for watchband particles, moulds for automobile internal gears and connecting rods, half shaft extrusion forming moulds and stamping upper moulds of electric connectors. The present invention additionally provides the heat treatment technology of the die steel.
Description
Technical field
The present invention relates to a kind of alloy tool steel, relate in particular to a kind of chromium steel series cold extruding die steel and thermal treatment process thereof.
Background technology
Oneself becomes production compression molding, 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, requirement punching press continuously in enormous quantities again, and then these steel also can't satisfy above-mentioned requirements, such as the mould that is used to push the watchband grain.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 also raises greatly.
Summary of the invention
Poor in order to solve above-mentioned mould fatigue resistance, die life is short, the defective that production cost is high.The purpose of this invention is to provide a kind of replaced C r
8Mo2V1Si also has enough toughness and wear resistance after quenching, can make meticulous mould, long service life, punching press continuously in enormous quantities, the chromium steel series cold extruding die steel that production cost is low.
Second purpose of the present invention provides the thermal treatment process of above-mentioned chromium steel series cold extruding die steel.
In order to reach first above-mentioned goal of the invention, the present invention has adopted following technical scheme:
A kind of chromium steel series cold extruding die steel, this die steel comprises by weight percentage: carbon C0.8～0.9%, chromium Cr7.3～8.3%, molybdenum Mo1.2～2.0%, vanadium V0.3～0.9%, nickel 0.3～0.9%, tungsten W1.2～1.8%, 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 C0.75%, and chromium Cr7.8%, molybdenum Mo1.5%, vanadium V0.5%, nickel 0.6%, tungsten W1.6%, 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 chromium steel series cold extruding 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 1040～1080 ℃, 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, step (4) tempering cooling is carried out temper later once more, and tempering temperature is 510 ℃, 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 0.8～1.05%.
Silicon its objective is the hardening capacity, temper resistance and the matrix strength that improve steel, guarantees high-temperature temperature, hot hardness and the thermostability of steel, 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 Cr8Mo2V1Si ratio, carbon, silicone content are reduced, the also corresponding reduction of molybdenum content, increase a certain amount of tungsten and minor amount of nickel, both increased toughness and wear resistance, and improved hardening capacity and comprehensive mechanical greatly, particularly cryogenic impelling strength is quite high, can make meticulous mould, long service life, reduce production cost again.This practicality is suitable for making finish module tool watchband grain, the internal-gear of automobile and the mould of connecting rod, the cold extrusion shaped mould of semiaxis, and electronic connector punching press patrix.
Description of drawings
Fig. 1 is chromium steel series cold extruding die steel heat treatment cycle curve figure of the present invention.
Fig. 2 is chromium steel series cold extruding die steel tempering curve figure of the present invention.
Embodiment
Embodiment 1
A kind of chromium steel series cold extruding die steel, this die steel comprises by weight percentage: carbon C0.75%, chromium Cr7.8%, molybdenum Mo1.5%, vanadium V0.5%, nickel 0.6%, tungsten W1.6%, 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 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 860 ℃, and the time of preheating is 45 minutes;
(3), the heating of quenching, quenching temperature is 1040～1080 ℃, 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.
A kind of chromium steel series cold extruding 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 W1.2%, silicon Si0.1%, manganese Mn0.1%, sulphur S≤0.015%, phosphorus P≤0.02%, its surplus is iron Fe.
Above-mentioned 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 1040～1080 ℃, 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 510 ℃, 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 chromium steel series cold extruding 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 W2.0%, 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 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 1040～1080 ℃, 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 (9)
1. chromium steel series cold extruding die steel, it is characterized in that this die steel comprises by weight percentage: carbon C0.8～0.9%, chromium Cr7.3～8.3%, molybdenum Mo1.2～2.0%, vanadium V0.3～0.9%, nickel 0.3～0.9%, tungsten W1.2～1.8%, silicon Si0.1～0.4%, manganese Mn0.1～0.4%, sulphur S≤0.015%, phosphorus P≤0.02%, its surplus is iron Fe.
2. a kind of chromium steel series cold extruding die steel as claimed in claim 1 is characterized in that this die steel also comprises: the niobium below 0.3%.
3. a kind of chromium steel series cold extruding die steel as claimed in claim 1 is characterized in that this die steel also comprises: the titanium below 0.3%.
4. a kind of chromium steel series cold extruding die steel as claimed in claim 1 is characterized in that this die steel also comprises: the rare earth element below 0.05%.
5. chromium steel series cold extruding die steel, it is characterized in that this die steel comprises by weight percentage: carbon C0.75%, chromium Cr7.8%, molybdenum Mo1.5%, vanadium V0.5%, nickel 0.6%, tungsten W1.6%, silicon Si0.2%, manganese Mn0.2%, sulphur S≤0.015%, phosphorus P≤0.02%, its surplus is iron Fe.
6. the thermal treatment process of chromium steel series cold extruding 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 1040～1080 ℃, 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.
7. the thermal treatment process of chromium steel series cold extruding die steel as claimed in claim 6 is characterized in that adopting the oil cooling cooling in the step (3), drops to 200～250 ℃ of warm wash in temperature.
8. the thermal treatment process of chromium steel series cold extruding die steel as claimed in claim 6 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.
9. the thermal treatment process of chromium steel series cold extruding die steel as claimed in claim 6 is characterized in that carrying out temper once more after step (4) the tempering cooling, and tempering temperature is 510 ℃, and air cooling is to room temperature then.
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| CNB2006100492603A CN100447284C (en) | 2006-01-25 | 2006-01-25 | Chromium steel series cold extruding die steel and heat treatment technique thereof |
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| CN100447284C true CN100447284C (en) | 2008-12-31 |
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| CN105420630A (en) * | 2015-11-13 | 2016-03-23 | 太仓旺美模具有限公司 | Steel material for cold-working mould |
| CN105648315A (en) * | 2016-01-27 | 2016-06-08 | 太仓旺美模具有限公司 | High-strength mold steel for cold-punched mold |
| CN105886734A (en) * | 2016-06-24 | 2016-08-24 | 相城区黄桥荣翔金属制品厂 | Low-temperature preheating heat treatment process for hardware |
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| 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 |
| 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 |
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| CN1166533A (en) * | 1996-05-26 | 1997-12-03 | 戚正风 | Ledeburite-free high-alloy cold-work die steel |
| JP2002167644A (en) * | 2000-11-30 | 2002-06-11 | Daido Steel Co Ltd | Cold tool steel having constant deformation on treatment and method for producing cold tool using the steel |
| JP2005272899A (en) * | 2004-03-23 | 2005-10-06 | Nippon Koshuha Steel Co Ltd | Tool steel having self-lubricity |
| CN1696326A (en) * | 2004-05-14 | 2005-11-16 | 大同特殊钢株式会社 | Cold work tool steel |
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2006
- 2006-01-25 CN CNB2006100492603A patent/CN100447284C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1166533A (en) * | 1996-05-26 | 1997-12-03 | 戚正风 | Ledeburite-free high-alloy cold-work die steel |
| JP2002167644A (en) * | 2000-11-30 | 2002-06-11 | Daido Steel Co Ltd | Cold tool steel having constant deformation on treatment and method for producing cold tool using the steel |
| JP2005272899A (en) * | 2004-03-23 | 2005-10-06 | Nippon Koshuha Steel Co Ltd | Tool steel having self-lubricity |
| CN1696326A (en) * | 2004-05-14 | 2005-11-16 | 大同特殊钢株式会社 | Cold work tool steel |
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