CN103233186A - Steel for compression mold and production method thereof - Google Patents
Steel for compression mold and production method thereof Download PDFInfo
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- CN103233186A CN103233186A CN2013102034332A CN201310203433A CN103233186A CN 103233186 A CN103233186 A CN 103233186A CN 2013102034332 A CN2013102034332 A CN 2013102034332A CN 201310203433 A CN201310203433 A CN 201310203433A CN 103233186 A CN103233186 A CN 103233186A
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Abstract
The invention provides steel for a compression mold and a production method thereof. Compression molding needs to be performed under the combined action of high temperature and high pressure, thus having high requirements for a mold material; and the mold material should have high hardness, strength and wear resistance, enough toughness, high quenching capacity and hardening capacity and favorable cutting resistance. The steel for a compression mold is characterized by comprising the following components in percentage by mass: 0.7-1.2% of C, 0.8-1.35% of Mn, 0.10-0.30% of S, no more than 0.04% of Si, no more than 0.02% of P, 0.20-0.30% of Pb, 0.05-0.08% of Bi, 0.15-0.45% of W, 0.10-3.00% of Mo, 0.10-0.80% of Ti, 0.01-0.2% of Al and the balance of Fe and inevitable impurities. The invention is used for producing a compression mold.
Description
Technical field:
The present invention relates to a kind of die steel, be specifically related to a kind of compression tool steel and production method thereof.
Background technology:
Mould of plastics comprises compressed moulding and two kinds of structure mold types of injection-compression molding.They are class moulds that are mainly used to the moulding thermosetting resin, and its corresponding equipment is pressure forming machine.Compression-molding method is according to plastic properties, with mold heated to mold temperature (generally at 103 ℃-180 ℃), then the molding powder that measures is put into mold cavity and feed compartment, close die, plastics are in high warm, be softening viscosity flow under the high pressure effect, through the typing of certain hour after fixing, become required article shape.What injection-compression molding was different with compressed moulding is not have independent feed compartment, and mould of plastics moulding front mold is closed earlier, and plastics are finished preheating and are viscous state in feed compartment, adjusts under pressure and clamp-ons mold cavity, hardened forming.Compression mould also is used for some special thermoplastics of moulding as the thermoplastics that is difficult to fusion (as the poly-vinyl fluoride that adds) blank (coldmoulding), the resin lens that optical property is very high, the nitrocellulose vehicle steering of slight foaming etc.Therefore compression moulding will be subjected to the combined action of High Temperature High Pressure, moulding stock is had relatively high expectations, and should have high hardness, intensity, wear resistance, enough toughness, and high hardening capacity, hardenability and and have a good anti-cutting ability.
Summary of the invention:
The objective of the invention is provides a kind of compression tool steel and production method thereof at the problem of above-mentioned existence, this steel has high hardness, intensity, wear resistance, enough toughness, and high hardening capacity, hardenability and and have good anti-cutting ability, be adapted to the needs of compression tool.
Above-mentioned purpose realizes by following technical scheme:
The compression tool steel, by the quality percentage composition comprise 0.7%-1.2% C, 0.8-1.35% Mn, 0.10%-0.30% S, be not more than 0.04% Si, be not more than 0.02% P, Ti, 0.01%～0.2% the Al of Mo, the 0.10%---0.80% of 0.20%～0.30% Pb, 0.05%～0.08% Bi, 0.15～0.45% W, 0.10%--3.00%, surplus is Fe and unavoidable impurities.
The compression tool steel, by the quality percentage composition comprise 0.8%-1.1% C, 0.9-1.25% Mn, 0.15%-0.25% S, be not more than 0.04% Si, be not more than 0.02% P, Ti, 0.15%～0.2% the Al of Mo, the 0.20%---0.70% of 0.20%～0.30% Pb, 0.06%～0.08% Bi, 0.20～0.40% W, 1.00%--2.55%, surplus is Fe and unavoidable impurities.
The compression tool steel, comprise 1.2% C, 0.85% Mn, 0.25% S, be not more than 0.04% Si, be not more than 0.02% P, 0.25% Pb, 0.07% Bi, 0.15% W, 1.25% Mo, 0.75% Ti, 0.15% Al by the quality percentage composition, surplus is Fe and unavoidable impurities.
A kind of compression tool production method of steel; this method comprises: according to said ratio raw material is carried out molten iron pre-desulfurization successively; the converter top bottom blowing; bottom blowing Ar stirs; described bottom blowing Ar churning time is no less than 12 minutes; carrying out trimming through the RH stove then obtains carrying out the vacuum circulation degassing processing after the said ratio; guarantee that the pure degassing time of RH is no less than 6 minutes; adopt whole process to blow Ar protection casting again; be cast into steel ingot; steel ingot is through the postheat treatment of process furnace reheat, and the thermal treatment initial temperature is 950 ℃～980 ℃, time 1-2 hour; the thermal treatment end temp is 1100 ℃～1150 ℃; tempering temperature is 860 ℃～880 ℃, tempering time 2 hours, 550 ℃～650 ℃ of quenching temperatures.
Beneficial effect:
1. show through inventor's experimental study repeatedly: the C that adopts 0.7%-1.2% among the present invention, make compression tool of the present invention have premium propertiess such as hot strength and alkali resistance burn into resistance to oxidation with steel, have simultaneously cut high minute surface preferably, polishing performance is good, acid-proof is antirust splendid, heat treatment deformation is little; Be applicable to the requirement of compression tool;
The present invention contains 0.8-1.35% Mn, makes that cutting is cataclasm easily, and is conducive to improve the quality of finished surface; 0.10%-0.30% S improves the machinability of steel, artificially sulphur content is improved, and to form sulfide, works the successional effect of matrix of interrupting;
Si, reinforced ferrite, intensity and the hardness of raising steel, the critical cooling velocity of reduction steel, the hardening capacity of raising steel, the solidity to corrosion in the oxidisability corrosive medium of raising steel, the thermotolerance of raising steel;
The present invention adopts 0.20%～0.30% Pb, plumbous is tiny metallic particles form in steel, evenly distribute or be attached to sulfide around.Because plumbous fusing point is lower, lubricate is oozed out in melting during cutting, reduces friction, improves machinability, but does not influence ambient temperature mechanical properties;
Because mould when thermal treatment, especially in quenching process, produce volume change, shape warpage, distortion etc., for guaranteeing die quality, require the heat treatment deformation of die steel little, particularly for complex-shaped precision die, be difficult to finishing after the quenching, requirement for the heat treatment deformation degree is more harsh, the present invention adopts 0.01～0.5% W, improves the intensity of steel, improves the hot strength of steel, improve the anti-hydrogen performance of steel, make steel have thermohardening;
The present invention adopts the Mo of 0.10%--3.00%, and molybdenum has the solution strengthening effect to ferrite, improves the steel heat resistance, the effect of anti-hydrogen attack, the hardening capacity of raising steel.
Because mould in heat-processed, if oxidation, decarburization phenomenon take place, will make its hardness, wear resistance, use properties and work-ing life reduce; Therefore, require the oxidation of die steel, decarburization susceptibility good.The present invention adopts the Ti of 0.10%---0.80%, can improve the heat resistance of steel, improves creep-resistant property and the creep rupture strength of steel.And can improve the stability of steel in High Temperature High Pressure hydrogen.Make steel under high pressure to the stability of hydrogen up to more than 600 ℃, in perlite low alloy steel, titanium can stop molybdenum steel greying phenomenon at high temperature.
The present invention adopts 0.15%～0.2% Al, and the nitrogen agent is decided in the deoxidation during as steel-making, crystal grain thinning, and the timeliness of inhibition soft steel is improved the toughness of steel when low temperature, has particularly reduced the brittle transition temperature of steel; Improve the antioxidant property of steel.
2. the effect of the system of heat treatment process taked of the present invention is as follows:
The steel ingot Heating temperature: the steel ingot Heating temperature is set at the dissolving of guaranteeing the Ti element, and the too high meeting of slab heating temperature causes that the steel ingot austenite crystal grows up unusually.
The thermal treatment of the following temperature of recrystallize: stop the density that thermal treatment below the temperature can increase ferrite nucleation site in the austenite by recrystallize, control ferrite and pearlitic grain size, this toughness for the effect of bringing into play refined crystalline strengthening and raising material is very crucial.
Thermal treatment end temp: take equally effectively thinning microstructure of lower thermal treatment temp, improve the toughness of product.Because under the low temperature, rate of diffusion is slow, therefore the low finishing temperature compound that can also suppress Ti is separated out, and increases the result that the reservation amount of Ti in sosoloid all can obtain low transition temperature and increase precipitation strength in the ferrite.
The present invention adopts average tempering, and carbide is suitably assembled, and obtain the thicker tempered sorbite tissue of carbide particle (organizing similar to Spheroidizing Annealing), thereby the steel of this condition of delivery has good machinability.
Quenching temperature: suitable quenching temperature is the important assurance that obtains suitable perlite and ferrite grain size composition, also is Ti separating out in 550 ℃～650 ℃ temperature ranges simultaneously, guarantees the homogeneity of the disperse distribution of compound in steel matrix of Ti.
3. because the present invention adopts reasonable proportioning, good complete processing makes yield strength of the present invention surpass 500 MPa, and tensile strength surpasses 600MPa, has wear resistance and thermal fatigue resistance preferably simultaneously, has machinability preferably.
Embodiment:
Embodiment 1:
The compression tool steel, by the quality percentage composition comprise 0.7%-1.2% C, 0.8-1.35% Mn, 0.10%-0.30% S, be not more than 0.04% Si, be not more than 0.02% P, Ti, 0.01%～0.2% the Al of Mo, the 0.10%---0.80% of 0.20%～0.30% Pb, 0.05%～0.08% Bi, 0.15～0.45% W, 0.10%--3.00%, surplus is Fe and unavoidable impurities.
Embodiment 2:
The compression tool steel, by the quality percentage composition comprise 0.8%-1.1% C, 0.9-1.25% Mn, 0.15%-0.25% S, be not more than 0.04% Si, be not more than 0.02% P, Ti, 0.15%～0.2% the Al of Mo, the 0.20%---0.70% of 0.20%～0.30% Pb, 0.06%～0.08% Bi, 0.20～0.40% W, 1.00%--2.55%, surplus is Fe and unavoidable impurities.
Embodiment 3:
The compression tool steel, comprise 0.12% C, 0.85% Mn, 0.25% S, be not more than 0.04% Si, be not more than 0.02% P, 0.25% Pb, 0.07% Bi, 0.15% W, 1.25% Mo, 0.75% Ti, 0.15% Al by the quality percentage composition, surplus is Fe and unavoidable impurities.
Embodiment 4:
The compression tool steel, comprise 0.5% C, 0.6% Mn, 0.08% S, be not more than 0.04% Si, be not more than 0.02% P, 0.10% Pb, 0.10% Bi, 0.5% W, 4.00% Mo, 0.90% Ti, 0.005% Al by the quality percentage composition, surplus is Fe and unavoidable impurities.
Embodiment 5:
The compression tool steel, comprise 1.5% C, 1.55% Mn, 0.30% S, be not more than 0.04% Si, be not more than 0.02% P, 0.35% Pb, 0.03% Bi, 0.01 W, 0.10%% Mo, 0.05% Ti, 0.005% Al by the quality percentage composition, surplus is Fe and unavoidable impurities.
The above-mentioned compression tool production method of steel; this method comprises: according to said ratio raw material is carried out molten iron pre-desulfurization successively; the converter top bottom blowing; bottom blowing Ar stirs; described bottom blowing Ar churning time is no less than 12 minutes; carrying out trimming through the RH stove then obtains carrying out the vacuum circulation degassing processing after the said ratio; guarantee that the pure degassing time of RH is no less than 6 minutes; adopt whole process to blow Ar protection casting again; be cast into steel ingot; steel ingot is through the postheat treatment of process furnace reheat, and the thermal treatment initial temperature is 950 ℃～980 ℃, time 1-2 hour; the thermal treatment end temp is 1100 ℃～1150 ℃; tempering temperature is 860 ℃～880 ℃, tempering time 2 hours, 550 ℃～650 ℃ of quenching temperatures.
The disclosed technique means of the present invention program is not limited only to the disclosed technique means of above-mentioned technique means, also comprises by above technical characterictic being equal to the technical scheme that replacement is formed.Unaccomplished matter of the present invention belongs to those skilled in the art's common practise.
Claims (4)
1. compression tool steel, it is characterized in that: by the quality percentage composition comprise 0.7%-1.2% C, 0.8-1.35% Mn, 0.10%-0.30% S, be not more than 0.04% Si, be not more than 0.02% P, Ti, 0.01%～0.2% the Al of Mo, the 0.10%---0.80% of 0.20%～0.30% Pb, 0.05%～0.08% Bi, 0.15～0.45% W, 0.10%--3.00%, surplus is Fe and unavoidable impurities.
2. compression tool steel, it is characterized in that: by the quality percentage composition comprise 0.8%-1.1% C, 0.9-1.25% Mn, 0.15%-0.25% S, be not more than 0.04% Si, be not more than 0.02% P, Ti, 0.15%～0.2% the Al of Mo, the 0.20%---0.70% of 0.20%～0.30% Pb, 0.06%～0.08% Bi, 0.20～0.40% W, 1.00%--2.55%, surplus is Fe and unavoidable impurities.
3. compression tool steel, it is characterized in that: comprise 0.12% C, 0.85% Mn, 0.25% S, be not more than 0.04% Si, be not more than 0.02% P, 0.25% Pb, 0.07% Bi, 0.15% W, 1.25% Mo, 0.75% Ti, 0.15% Al by the quality percentage composition, surplus is Fe and unavoidable impurities.
4. a compression tool is with the production method of steel; it is characterized in that: this method comprises: according to said ratio raw material is carried out molten iron pre-desulfurization successively; the converter top bottom blowing; bottom blowing Ar stirs; described bottom blowing Ar churning time is no less than 12 minutes; carrying out trimming through the RH stove then obtains carrying out the vacuum circulation degassing processing after the said ratio; guarantee that the pure degassing time of RH is no less than 6 minutes; adopt whole process to blow Ar protection casting again; be cast into steel ingot; steel ingot is through the postheat treatment of process furnace reheat, and the thermal treatment initial temperature is 1180 ℃～1230 ℃, time 1-2 hour; the thermal treatment end temp is 900 ℃～950 ℃; tempering temperature is 860 ℃～880 ℃, tempering time 2 hours, 550 ℃～650 ℃ of quenching temperatures.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106119738A (en) * | 2016-06-28 | 2016-11-16 | 浙江工贸职业技术学院 | A kind of alloy material for marine drilling platform gauge valve spool and manufacture method |
| CN107523754A (en) * | 2017-06-30 | 2017-12-29 | 太仓旺美模具有限公司 | A kind of mold materials of wear-resisting heat conduction |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1876881A (en) * | 2005-06-02 | 2006-12-13 | 大同特殊钢株式会社 | Steel for a plastic molding die |
| JP2007231337A (en) * | 2006-02-28 | 2007-09-13 | Jfe Steel Kk | Hot rolled steel sheet and steel component |
| CN101410541A (en) * | 2006-12-25 | 2009-04-15 | 新日本制铁株式会社 | Steel for machine structure excelling in machinability and strength property |
-
2013
- 2013-05-28 CN CN2013102034332A patent/CN103233186A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1876881A (en) * | 2005-06-02 | 2006-12-13 | 大同特殊钢株式会社 | Steel for a plastic molding die |
| JP2007231337A (en) * | 2006-02-28 | 2007-09-13 | Jfe Steel Kk | Hot rolled steel sheet and steel component |
| CN101410541A (en) * | 2006-12-25 | 2009-04-15 | 新日本制铁株式会社 | Steel for machine structure excelling in machinability and strength property |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106119738A (en) * | 2016-06-28 | 2016-11-16 | 浙江工贸职业技术学院 | A kind of alloy material for marine drilling platform gauge valve spool and manufacture method |
| CN107523754A (en) * | 2017-06-30 | 2017-12-29 | 太仓旺美模具有限公司 | A kind of mold materials of wear-resisting heat conduction |
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Application publication date: 20130807 |