AU748866B2 - Method for producing steel for large molds - Google Patents
Method for producing steel for large molds Download PDFInfo
- Publication number
- AU748866B2 AU748866B2 AU69810/98A AU6981098A AU748866B2 AU 748866 B2 AU748866 B2 AU 748866B2 AU 69810/98 A AU69810/98 A AU 69810/98A AU 6981098 A AU6981098 A AU 6981098A AU 748866 B2 AU748866 B2 AU 748866B2
- Authority
- AU
- Australia
- Prior art keywords
- ppm
- steel
- mixture
- zirconium
- titanium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Description
AUSTRALIA
Patents Act 1990 COMPLETE SPECIFICATION STANDARD PATENT
C
Applicant(s): THYSSEN FRANCE SA Invention Title: METHOD FOR PRODUCING STEEL FOR LARGE MOLDS The following statement is a full description of this invention, including the best method of performing it known to me/us: la FIELD OF THE INVENTION The present invention relates to a method for producing a steel for a large mould and to a steel for a large mould.
BACKGROUND OF THE INVENTION Mould makers and plastic material transformers, forced by the needs of the motor industry and industry in general by the development of plastic technical applications in the ever-expanding motor vehicle sector and increasing technico-economic challenges, are increasingly requiring a steel for moulds making it possible to obtain moulds having a homogeneous hardness concerning thickness (from 30 to 35 Hrc), a thickness possibly extending up to 700 mm or even more.
The outgoing production times for a vehicle,
S.
"always becoming shorter and shorter, also pose problems as regards the management of real time modifications, as well as machinability and weldability.
20 It would be advantageous if at least preferred embodiments of the present invention provided a method for producing a steel for large moulds making it possible to oeo obtain a steel resolving these difficulties.
25 SUMMARY OF THE INVENTION In a first aspect, the present invention provides a method for producing a steel for a large mould, the method including the sequential steps of melting a mixture in an electric furnace, subjecting the mixture to a secondary metallurgical operation in a heating ladle, and vacuum degassing the mixture at a pressure of less than 1 torr, wherein the mixture has the following weighted composition: H: IsablIH\Spel\36580 .doc 3/07/01 2 Manganese 1 to 3% Silicon K 0.400% Phosphorus K 0.015% Chromium 1.50 to Molybdenum 0.25 to 1% Niobium 0.100 0.250% Titanium 0 or 100 to 300 ppm Zirconium 0 or 100 to 300 ppm Copper K 0.300% 10 Nickel 5 0.300% SNitrogen K 80 ppm Oxygen K 80 ppm Calcium 30 ppm Boron 15 to 50 ppm 15 Carbon 0.10 to 0.25% Sulfur K 0.050% .Aluminium 250 ppm and wherein the balance of the mixture is iron and impurities characteristic of the production of steel.
20 Preferably, the mixture has the following weighted composition: Manganese 1.50 2% Silicon 0.050 0.150% Phosphorus K 0.008% Chromium 2 to 2.40% Molybdenum 0.35 0.50% Niobium 0.100 0.150% Titanium and/or zirconium 100 to 300 ppm Copper K 0.100% Nickel K 0.200% Nitrogen 30 ppm Oxygen K 20 ppm Calcium 5 to 20 ppm Boron 20 to 30 ppm Carbon 0.15 to 0.20% Sulfur K 0.005% Aluminium 40 ppm \\BP.IS\homeS\IsabelH\Spec i 365°0 doc 14/03/02 3 wherein the balance of the mixture is iron and impurities characteristic of the production of steel.
Preferably, the vacuum degassing is carried out at a pressure of about 0.2 torr.
It is subsequently possible to submit the ingot obtained after degassing to a remelting process by consumable electrode under vacuum or under slag, the ingot being used as a consumable electrode.
It is also possible to submit the ingot to a 10 first vacuum remelting and then to a second slag remelting S. process.
In a second aspect, the present invention provides steel produced by a method according to the first aspect of the present invention.
0 15 In a third aspect, the present invention provides a steel for a large mould having the following weighted composition: Manganese 1 to 3% 20 Silicon 0.400% Phosphorus 0.015% Chromium 1.50 to SMolybdenum 0.25 to 1% Niobium 0.100 0.250% Titanium 0 or 100 to 300 ppm Zirconium 0 or 100 to 300 ppm Copper 0.300% Nickel 0.300% Nitrogen 80 ppm Oxygen 80 ppm Calcium 30 ppm Boron 15 to 50 ppm Carbon 0.10 to 0.25% Sulfur 0.050% Aluminium 250 ppm wherein the balance is iron and impurities characteristic .BP.IS1home$\IsabelH\Speci\3658.cIoc 14/03/02 3a of the production of steel. Preferably, the steel contains 100-300 ppm titanium and/or zirconium.
More preferably, the steel has the following weighted composition: Manganese 1.50 2% Silicon 0.050 0.150% Phosphorus 0.008% Chromium 2 to 2.40% Molybdenum 0.35 0.50% S 10 Niobium 0.100 0.150% Titanium 0 or 00 to 200 ppm Zirconium 0 or 100 to 200 ppm Copper 0.100% Nickel 0.200% o• 15 Nitrogen 30 ppm Oxygen 20 ppm Calcium 5 to 20 ppm Boron 20 to 30 ppm *e Carbon 0.15 to 0.20% Sulfur 0.005% Aluminium 40 ppm
S
**S.SS
wherein the balance is iron and impurities characteristic of the production of steel. Preferably, the steel contains 100-200 ppm titanium and/or 100-200 ppm zirconium.
DESCRIPTION OF THE INVENTION In one embodiment of the invention, which will now be described in detail by example only, the manganese sulfides appear in the form of fully distributed globes and the globular oxides are preferably encapsulated by calcium sulfides. This steel posses double hardening, a primary hardening by hardening the solid solution by inserting boron during austenitization and precipitation during the quench hardening of \\BPIS\homeS\sabelHl\Speci\365RO.doc 14/03/02 M23 type boro-carbides 6. These extremely fine precipitates germinate during the extremely energetic quench hardening to the austenity grain boundaries owing to their cubic structure with centered parameter faces a= 10.6 A°.
These boro-carbides are in orientation relation and in coherence with the austenite of one of the two grains. This primary hardening is followed by a secondary hardening due to a dispersion mainly of carbides, nitrides, fine niobium carbo-nitrides precipitated homogeneously during an annealing. The niobium, an essential dispersoid element, assists in the control of the size of the grains and also at the time of reheating during recrystallization phenomena. It increases the hardenability of the steel and provokes a secondary hardening. The role of the niobium, allied to that of the boron, is fundamental in manufacturing the steel of the invention and for obtaining the mechanical characteristics mentioned below.
The steel possesses excellent aptitude to chemical granulation on machining and is electroerosive. It is also suitable for quality polishing (grain >1200 followed by a grain diamond polishing of 8 pt or indeed 34). It can be nitride-hardened, hardness 60 Rc.
The mechanical characteristics obtained for the product treated by hardening and precipitation between 400 0 C and 600 0 C is typically: Resistance to traction 2 950 N/mm 2 Elastic limit 0.2% 800 N/mm 2 Elongation, thickness direction 10% min Resilience value in KU, thickness direction 10 min Joules 5 Joules Brinell hardness in 0 10 mm 3.000Kg 290 to 330 This steel meets two fundamental properties for molds for the most part polishability and granulability linked to the homogeneity of its structure and as regards its inclusionary property.
For all shaping cases, its shaping is preferably carried out by thermo-mechanical transformation, such as forging, rolling or molding.
Claims (9)
1. A method for producing a steel for a large mould, the method including the sequential steps of melting a mixture in an electric furnace, subjecting the mixture to a secondary metallurgical operation in a heating ladle, and vacuum degassing the mixture at a pressure of less than 1 torr, wherein the mixture has the following weighted composition: r 9 Manganese Silicon 15 Phosphorus Chromium Molybdenum Niobium Titanium Zirconium Copper Nickel Nitrogen Oxygen Calcium Boron Carbon Sulfur Aluminium 1 to 3% 0.400% 0.015% 1.50 to 0.25 to l% 0.100 0.250% 0 or 100 to 300 ppm 0 or 100 to 300 ppm 0.300% 0.300% 80 ppm 80 ppm 30 ppm 15 to 50 ppm 0.10 to 0.25% 0.050% K 250 ppm and wherein the balance of the mixture is iron and impurities characteristic of the production of steel.
2. A method as claimed in claim 1 wherein the vacuum degassing is carried out at a pressure of about 0.2 torr. \\BRISI\home$\ tsbeIH\Speci\36580.doc 14/03/02 6
3. A method as claimed in claim 1 or claim 2 further including subjecting an ingot obtained following step to a remelting process by consumable electrode under vacuum or under slag, wherein the ingot is used as the consumable electrode.
4. A method as claimed in claim 1 or claim 2 further including subjecting an ingot obtained following S 10 step to a first remelting process by consumable electrode under vacuum and subsequently to a second remelting process by consumable electrode under slag, wherein the ingot is used as the consumable electrode. 15 5. A method as claimed in any one of the preceding claims further including shaping the steel by thermo-mechanical transformation. go
6. A method for producing a steel for a large 20 mould, the method being substantially as herein described.
7. Steel produced by a method as claimed in any one of the preceding claims.
8. A steel for a large mould having the following weighted composition: Manganese 1 to 3% Silicon 0.400% Phosphorus 0.015% Chromium 1.50 to Molybdenum 0.25 to 1% Niobium 0.100 0.250% Titanium 0 or 100 to 300 ppm Zirconium 0 or 100 to 300 ppm Copper 0.300% Nickel K 0.300% \\BP.IS1\home$\ IsabelH\Speci \3653 -doc 14/03/02 7 Nitrogen Oxygen Calcium Boron Carbon Sulfur Aluminium 80 ppm 80 ppm 30 ppm 15 to 50 ppm 0.10 to 0.25% 0.050% 250 ppm C. C C C S wherein the balance is iron and impurities characteristic of the production of steel.
9. A steel as claimed in clam 8 containing
100-300 ppm titanium and/or 100-300 ppm zirconium. 15 10. A steel as claimed in claim 8 having the following weighted composition: Manganese Silicon 20 Phosphorus Chromium Molybdenum Niobium Titanium Zirconium Copper Nickel Nitrogen Oxygen Calcium Boron Carbon Sulfur Aluminium 1.50 2% 0.050 0.150% 0.008% 2 to 2.40% 0.35 0.50% 0.100 0.150% 0 or 100 to 200 ppm 0 or 100 to 200 ppm 0.100% 0.200% 30 ppm 20 ppm 5 to 20 ppm 20 to 30 ppm 0.15 to 0.20% 0.005% 40 ppm wherein the balance is iron and impurities characteristic of the production of steel. OR.ISIhorne$IsabolH\SpedCi\3658dOC 14/03/02 8 11. A steel as claimed in claim 10 containing 100-200 ppm titanium and/or 100-200 ppm zirconium. 12. A steel for a large mould, the steel being substantially as herein described. 10 Dated this 1 4 t h day of March 2002 THYSSEN FRANCE SA By its Patent Attorneys GRIFFITH HACK ee 1 *e e 4* o f *r \\ePIS1\home$\IsabelH\Speci',365R0.cloc 14/03:02
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9707138A FR2764308B1 (en) | 1997-06-04 | 1997-06-04 | PROCESS FOR THE MANUFACTURE OF A STEEL FOR LARGE DIMENSION MOLDS |
| FR9707138 | 1997-06-04 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU6981098A AU6981098A (en) | 1998-12-10 |
| AU748866B2 true AU748866B2 (en) | 2002-06-13 |
Family
ID=9507783
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU69810/98A Ceased AU748866B2 (en) | 1997-06-04 | 1998-05-29 | Method for producing steel for large molds |
Country Status (13)
| Country | Link |
|---|---|
| EP (1) | EP0882808B1 (en) |
| CN (1) | CN1079839C (en) |
| AR (1) | AR015385A1 (en) |
| AT (1) | ATE212385T1 (en) |
| AU (1) | AU748866B2 (en) |
| BR (1) | BR9814777A (en) |
| DE (1) | DE69803514T2 (en) |
| ES (1) | ES2170462T3 (en) |
| FR (1) | FR2764308B1 (en) |
| HK (1) | HK1019901A1 (en) |
| MY (1) | MY120154A (en) |
| PT (1) | PT882808E (en) |
| SG (1) | SG63849A1 (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3514182B2 (en) | 1999-08-31 | 2004-03-31 | 住友金属工業株式会社 | Low Cr ferritic heat resistant steel excellent in high temperature strength and toughness and method for producing the same |
| ATE244319T1 (en) * | 2001-04-17 | 2003-07-15 | Buderus Edelstahlwerke Ag | USING A TOOL STEEL FOR PLASTIC MOLDS |
| FR2838137A1 (en) * | 2002-04-03 | 2003-10-10 | Usinor | STEEL FOR THE MANUFACTURE OF MOLDS FOR INJECTION MOLDING OF PLASTIC MATERIALS OR FOR THE MANUFACTURE OF TOOLS FOR THE WORKING OF METALS |
| FR2838138B1 (en) * | 2002-04-03 | 2005-04-22 | Usinor | STEEL FOR THE MANUFACTURE OF PLASTIC INJECTION MOLDS OR FOR THE MANUFACTURE OF WORKPIECES FOR METAL WORKING |
| EP2123787A1 (en) * | 2008-05-06 | 2009-11-25 | Industeel Creusot | High-grade steel for massive parts. |
| JP5412851B2 (en) * | 2009-01-29 | 2014-02-12 | 大同特殊鋼株式会社 | Steel for plastic molds and plastic molds |
| CN102787206B (en) * | 2012-08-06 | 2014-12-10 | 攀钢集团江油长城特殊钢有限公司 | Smelting method for controlling nitrogen content in steel ingot of medium carbon chromous mold steel and steel ingot |
| CN103774047B (en) * | 2012-10-20 | 2017-03-01 | 大同特殊钢株式会社 | There is the mould steel of excellent thermal conductance, mirror polishability and toughness |
| CN105839011A (en) * | 2016-04-08 | 2016-08-10 | 太仓市沪太热处理厂 | Large-size cold work die steel and heat treatment technique thereof |
| TWI756226B (en) | 2016-06-30 | 2022-03-01 | 瑞典商伍德赫爾恩股份有限公司 | A steel for a tool holder |
| CN106987769B (en) * | 2017-03-29 | 2018-08-03 | 苏州浩焱精密模具有限公司 | A kind of high rigidity fine etching cutting die |
| JP7167483B2 (en) * | 2018-05-15 | 2022-11-09 | 大同特殊鋼株式会社 | Steel for die casting molds and die casting molds |
| CN108893682B (en) * | 2018-08-01 | 2020-10-09 | 攀钢集团攀枝花钢铁研究院有限公司 | Die steel billet and preparation method thereof |
| CN112501447A (en) * | 2020-11-16 | 2021-03-16 | 山西太钢不锈钢股份有限公司 | Smelting method of 18CrNiMo7-6 steel |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1903070A1 (en) * | 1968-01-22 | 1972-06-15 | Nippon Kopan K K | High-strength, low-alloy steel with sufficient weldability |
| JP2881869B2 (en) * | 1989-12-06 | 1999-04-12 | 大同特殊鋼株式会社 | Steel for plastic molds with excellent weldability |
| US5213634A (en) * | 1991-04-08 | 1993-05-25 | Deardo Anthony J | Multiphase microalloyed steel and method thereof |
| JP3139876B2 (en) * | 1993-04-05 | 2001-03-05 | 新日本製鐵株式会社 | Method of manufacturing non-heat treated steel for hot forging and non-heat treated hot forged product, and non-heat treated hot forged product |
-
1997
- 1997-06-04 FR FR9707138A patent/FR2764308B1/en not_active Expired - Fee Related
-
1998
- 1998-05-21 SG SG1998001099A patent/SG63849A1/en unknown
- 1998-05-28 PT PT98401272T patent/PT882808E/en unknown
- 1998-05-28 DE DE69803514T patent/DE69803514T2/en not_active Expired - Fee Related
- 1998-05-28 ES ES98401272T patent/ES2170462T3/en not_active Expired - Lifetime
- 1998-05-28 BR BR9814777-3A patent/BR9814777A/en not_active IP Right Cessation
- 1998-05-28 EP EP98401272A patent/EP0882808B1/en not_active Expired - Lifetime
- 1998-05-28 AT AT98401272T patent/ATE212385T1/en not_active IP Right Cessation
- 1998-05-29 AU AU69810/98A patent/AU748866B2/en not_active Ceased
- 1998-06-03 CN CN98103518A patent/CN1079839C/en not_active Expired - Fee Related
- 1998-06-03 MY MYPI98002472A patent/MY120154A/en unknown
- 1998-06-04 AR ARP980102636A patent/AR015385A1/en active IP Right Grant
-
1999
- 1999-11-04 HK HK99105050A patent/HK1019901A1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| EP0882808A1 (en) | 1998-12-09 |
| FR2764308A1 (en) | 1998-12-11 |
| BR9814777A (en) | 2000-10-24 |
| DE69803514D1 (en) | 2002-03-14 |
| AU6981098A (en) | 1998-12-10 |
| CN1215762A (en) | 1999-05-05 |
| PT882808E (en) | 2002-07-31 |
| EP0882808B1 (en) | 2002-01-23 |
| AR015385A1 (en) | 2001-05-02 |
| HK1019901A1 (en) | 2000-03-03 |
| CN1079839C (en) | 2002-02-27 |
| FR2764308B1 (en) | 1999-07-23 |
| DE69803514T2 (en) | 2002-08-29 |
| MY120154A (en) | 2005-09-30 |
| SG63849A1 (en) | 1999-03-30 |
| ATE212385T1 (en) | 2002-02-15 |
| ES2170462T3 (en) | 2002-08-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FGA | Letters patent sealed or granted (standard patent) |