EP0179832A1 - Verfahren zur herstellung von stabstahl und walzdraht und so hergestellte gegenstände - Google Patents
Verfahren zur herstellung von stabstahl und walzdraht und so hergestellte gegenständeInfo
- Publication number
- EP0179832A1 EP0179832A1 EP19850902055 EP85902055A EP0179832A1 EP 0179832 A1 EP0179832 A1 EP 0179832A1 EP 19850902055 EP19850902055 EP 19850902055 EP 85902055 A EP85902055 A EP 85902055A EP 0179832 A1 EP0179832 A1 EP 0179832A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bars
- mpa
- resilience
- hot working
- steel
- 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.)
- Withdrawn
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 43
- 239000010959 steel Substances 0.000 title claims abstract description 43
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 229910052796 boron Inorganic materials 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims abstract description 5
- 238000005496 tempering Methods 0.000 claims description 37
- 229910052748 manganese Inorganic materials 0.000 claims description 23
- 230000009467 reduction Effects 0.000 claims description 9
- 229910052714 tellurium Inorganic materials 0.000 claims description 9
- 229910052717 sulfur Inorganic materials 0.000 claims description 8
- 238000005491 wire drawing Methods 0.000 claims description 3
- 238000003754 machining Methods 0.000 abstract description 10
- 230000009466 transformation Effects 0.000 abstract description 5
- 238000003466 welding Methods 0.000 abstract description 3
- 238000005553 drilling Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 37
- 239000011572 manganese Substances 0.000 description 32
- 238000005242 forging Methods 0.000 description 29
- 238000005266 casting Methods 0.000 description 27
- 238000007792 addition Methods 0.000 description 23
- 239000010936 titanium Substances 0.000 description 23
- 238000005096 rolling process Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 11
- 229910052799 carbon Inorganic materials 0.000 description 10
- 238000005098 hot rolling Methods 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 7
- 229910052719 titanium Inorganic materials 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 238000011282 treatment Methods 0.000 description 5
- 229910052902 vermiculite Inorganic materials 0.000 description 5
- 235000019354 vermiculite Nutrition 0.000 description 5
- 239000010455 vermiculite Substances 0.000 description 5
- UDHXJZHVNHGCEC-UHFFFAOYSA-N Chlorophacinone Chemical compound C1=CC(Cl)=CC=C1C(C=1C=CC=CC=1)C(=O)C1C(=O)C2=CC=CC=C2C1=O UDHXJZHVNHGCEC-UHFFFAOYSA-N 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229910052750 molybdenum Inorganic materials 0.000 description 4
- 229910052758 niobium Inorganic materials 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- 229910052720 vanadium Inorganic materials 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 235000019589 hardness Nutrition 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- -1 "35CD4" (C 0.35% Substances 0.000 description 1
- 229910001149 41xx steel Inorganic materials 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000007542 hardness measurement Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- 238000011426 transformation method Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
Definitions
- the method of the present invention relates to a method of manufacturing bars or wire rod of steel having in the raw state of hot transformation mechanical properties that are especially high, and further having after tempering, a set of mechanical characteristics and properties. more interesting to use than that traditionally obtained with heat treated steel bars.
- the bars often have a diameter greater than 80 mm, and for all requirements the diameters or thicknesses can range from 4 mm to 210 mm, whether they are erect or slightly straight bars. or crown wires.
- CrMo steel bars are commonly used (typical composition: C 0.42%, Cr 1%, Mo 0.25% - designation "42CD4" according to standard AFNOR NF A 35-557 of June 1975 ), close to grade AISI 4145H, in the quenched-tempered state.
- the Applicant has sought to develop an economical manufacturing process which makes it possible to satisfy these two types of need (bars with high mechanical characteristics such as "petroleum bars” on the one hand, and pretreated bars on the other hand), products obtained satisfying the various requirements of users: mechanical resistance, resilience, machinability, ability to be cold or lukewarm, weldability. -
- An essential advantage of the steel of the invention is that it can be produced in an electric steelworks, and obtained directly by hot working in a wide range of dimensions, from 4 mm to 210 mm in diameter or thickness.
- the invention thus relates to a method of manufacturing bars or steel wire rod having, after hot working and cooling, an essentially bainitic structure and high minimum characteristics: - breaking load: R ⁇ 1000 MPa
- composition intervals have been determined for the following elements, taken separately or in any combination:
- Nb preferably 0.05 to 0.10%.
- the role of Nb in manganese steels is similar to that observed in microalloyed steels: according to the publications made, Nb delays the recrystallization of austenite and allows hardening by precipitation. It is also known that the addition of Mn produces an increase in the solubility of Nb in austenite (publication by MGABKEN, J.WEISS and JJJONAS in Acta Metallurgica, 29, 1981, p.121).
- - N preferably between 0.003 and 0.010%, which is easily obtained in an electrical steelworks, equipped with a degasser.
- Tempering can thus be used for various uses, notably involving machining, welding and / or cold or lukewarm conformations, at a temperature usually below 300 ° C.
- a particular case is the manufacture of bolts, screws or nuts by cold or warm striking or by stamping, from bars or wire rod with a diameter between 4 and 50 mm, or on these same drawn bars or wire rod or drawn, with a diameter of between 3.3 and 50 mm.
- FIG. 1 represents the variations in the breaking load "R” and the elastic limit at 0.2% “E” as a function of the final forging temperature, for steels according to the invention and for reference steels without B.
- FIG. 2 represents the variations of the resilience KCU at 20 ° C. as a function of the temperature of final forging, for the same steels.
- Bars or wire rod with a diameter between 4 and 50 mm can be straightened or drawn (elongation between 3 and 20%) or drawn (total elongation up to 200%), cold or warm, preferably after tempering.
- the ingots from the castings of Table I were in all cases (for this series of tests and for the two following series) roughed into 40 x 40 mm squares. Then the ingots were brought to 1150 ° C for 30 min and cooled naturally to the forging temperature (T f ), and then underwent rapid forging to the square of 25 x 25 mm and were cooled either under vermiculite, either with water.
- T f forging temperature
- the law (time, cooling temperature under vermiculite) of a 25 mm steel square corresponds substantially to that of a 150 mm diameter bar in air.
- the first series of tests uses the ingots corresponding to the
- This third series of tests relates to the influence of an annealing heat treatment on the mechanical characteristics of the raw products of hot working.
- the tempering temperatures and the mechanical characteristics obtained are given in Table VI.
- the influence of the income is determined by comparison between the characteristics after income (Table VI) and those before income (Table IV or Table V), for each casting and for the same final forging temperature (T.).
- the tempering temperature (T) varies from 500 to 650 ° C for 2 batches forged at 1000 ° C (castings "88" and "89"), and is 450 ° C and 500 ° C for the other batches which are forged at 880 ° C or 900 ° C.
- the study of these results shows that, for flows at 4% Mn without B and for casting with B:
- the elastic limit E is improved, especially for the lowest tempering temperature tested, that is to say 450 ° C; the improvement is particularly significant in the case of the addition of 0.1% V (casting "18");
- the breaking load R is lowered in all cases, it decreases when the tempering temperature increases;
- tempering tests confirm the importance of carrying out the hot working, with a final working sufficient below 950 ° C. and better still below 900 ° C., to obtain high mechanical characteristics, both at state returned to the rough state of hot working.
- the set of results also shows that a temperature lower than 450 ° C, at least 400 ° C, may in some cases be preferable for tempering.
- a temperature lower than 450 ° C, at least 400 ° C may in some cases be preferable for tempering.
- the tempering temperature range 400-475 ° C is especially useful for improving the yield strength and elongation without greatly reducing the breaking load and resilience, while the range 475-600 ° C is particularly useful when after the tempering, a cold deformation or conformation is made.
- the laboratory flows carried out are of 3 kinds: flows at 4% Mn + B, flows at 4% Mn with staggered Ti additions, and a comparison flow of the "35CD4" type (AFNOR NF A35 standard -557).
- the ingots of the 4% Mn castings were first transformed into square bars of cross section 50 x 50 mm by forging at 1000 ° C, then cooled in air. They then underwent a controlled forging according to the following stages: heating to 1150 ° C., beginning and end of forging at 900 ° C., the forging of each ingot for approximately 90 s and the cross section obtained being a square of 25 ⁇ 25 mm (the ratio defined previously is then 4), then cooling under verjiiculite from around 750 ° C.
- the mechanical characterization (table VII) was made in the raw state of forging.
- the temperature of 525 ° C. is ill suited for the income of these bars ⁇ 170 mm in the event that good resilience is sought at heart.
- Table X groups the contents of certain elements particularly important for machinability (C, S, Te), the mechanical characteristics, averages of the results of Tables VIII and IX (R, E, A%, Z%, KCU at +20 ° C) and the result of the machining test.
- the Z% necking during the tensile test is indicated in these 3 tables in addition to the elongation A%, caractest as A% an interesting criterion of ductility and deformability.
- Table IX shows that the necking remains high across the cross section of the bars ⁇ 170 mm marked (2P) and (9P).
- Table X shows that in the case of bars (9P), elongation and relatively weak necking in the raw rolling state, the tempering at 525 ° C. makes it possible to increase these characteristics and to obtain a very interesting compromise in properties, taking into account the improvement in machinability.
- the machinability criterion chosen is the wear criterion of tool V B30-0.3 according to standard NF A 03-655, that is to say the cutting speed leading to wear in clearance of 0 , 3 mm in 30 minutes.
- the sixth series of tests relates to hot rolling and drawing of a 13 mm diameter machine wire according to the invention.
- the wire rod crown (1 ton) laminated to the diameter 13 mm comes from the ingot portion "1P" of industrial casting, the analysis of which is given in Table III.
- the hot rolling conditions are summarized as follows: - hot rolling in billets of straight section 108x108 mm and cooling - reheating to 1150-1200 ° C and hot rolling with engagement of the round of diameter 25 mm at 920 ° C and end of rolling at 800-850 ° C with a diameter of 13 mm with winding and air cooling. - the ratio characterizing the wrinkling below 950 ° C is at least equal to
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8406758A FR2563236B1 (fr) | 1984-04-24 | 1984-04-24 | Procede de fabrication de barres ou de fil machine en acier et produits correspondants |
| FR8406758 | 1984-04-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0179832A1 true EP0179832A1 (de) | 1986-05-07 |
Family
ID=9303599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19850902055 Withdrawn EP0179832A1 (de) | 1984-04-24 | 1985-04-24 | Verfahren zur herstellung von stabstahl und walzdraht und so hergestellte gegenstände |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0179832A1 (de) |
| JP (1) | JPS60238419A (de) |
| FR (1) | FR2563236B1 (de) |
| WO (1) | WO1985004906A1 (de) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE8603897L (sv) * | 1985-09-19 | 1987-03-20 | Man Nutzfahrzeuge Gmbh | Forfarande for framstellning av stalkonstruktioner |
| EP0348633A1 (de) * | 1988-04-30 | 1990-01-03 | Qinghua University | Lufthärtende Stähle mit Zwei-Phasen-Mikrostruktur-Bainit-Martensit |
| KR102030815B1 (ko) | 2016-12-28 | 2019-10-11 | 연세대학교 산학협력단 | 온간성형용 고강도 중망간강 성형부재와 그 제조방법 |
| WO2018124654A1 (ko) * | 2016-12-28 | 2018-07-05 | 연세대학교 산학협력단 | 온간성형용 고강도 중망간강과 그 제조방법 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3518080A (en) * | 1967-06-07 | 1970-06-30 | Fagersta Bruks Ab | High-strength weldable constructional steel with high manganese |
| AT309493B (de) * | 1967-11-07 | 1973-08-27 | Fagersta Bruks Ab | Hochzugfester, schweißbarer Stahl |
| SE335547B (de) * | 1970-02-11 | 1971-06-01 | Fagersta Bruks Ab | |
| FR2525709B1 (fr) * | 1982-04-22 | 1986-04-04 | Ugine Aciers | Vis et boulons en acier a hautes caracteristiques mecaniques et procede d'elaboration de ces vis et boulons |
-
1984
- 1984-04-24 FR FR8406758A patent/FR2563236B1/fr not_active Expired
-
1985
- 1985-04-23 JP JP8733985A patent/JPS60238419A/ja active Pending
- 1985-04-24 WO PCT/FR1985/000094 patent/WO1985004906A1/fr not_active Application Discontinuation
- 1985-04-24 EP EP19850902055 patent/EP0179832A1/de not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| See references of WO8504906A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60238419A (ja) | 1985-11-27 |
| WO1985004906A1 (fr) | 1985-11-07 |
| FR2563236A1 (fr) | 1985-10-25 |
| FR2563236B1 (fr) | 1986-06-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1649069B1 (de) | Verfahren zur herstellung von blechen aus austenitischem eisen/kohlenstoff/mangan-stahl mit hoher festigkeit und hervorragender zähigkeit und kaltumformbarkeit, und so hergestellte bleche | |
| CA2607446C (fr) | Acier martensitique durci, procede de fabrication d'une piece a partir de cet acier, et piece ainsi obtenue | |
| JP5114689B2 (ja) | 肌焼鋼及びその製造方法 | |
| JP5607956B2 (ja) | 摩擦圧接に適した機械構造用鋼材および摩擦圧接部品 | |
| FR2757877A1 (fr) | Acier et procede pour la fabrication d'une piece en acier mise en forme par deformation plastique a froid | |
| CA2984131A1 (fr) | Acier, produit realise en cet acier, et son procede de fabrication | |
| EP2556175A2 (de) | Mechanisches teil aus stahl mit hohen eigenschaften und herstellungsverfahren dafür | |
| WO2017064537A1 (fr) | Acier, produit réalisé en cet acier, et son procédé de fabrication | |
| EP0093218B1 (de) | Schrauben und Bolzen aus Stahl mit hoher Festigkeit und Verfahren zur Herstellung | |
| EP2134882A2 (de) | Mikrolegierter stahl mit guter beständigkeit gegenüber wasserstoff zur kaltumformung von maschinenteilen mit hohen eigenschaften | |
| CA2980878C (fr) | Pieces a structure bainitique a hautes proprietes de resistance et procede de fabrication | |
| EP0179832A1 (de) | Verfahren zur herstellung von stabstahl und walzdraht und so hergestellte gegenstände | |
| JP3490293B2 (ja) | 結晶粒粗大化防止特性と耐遅れ破壊特性に優れた冷間鍛造用鋼とその製造方法 | |
| EP1099769A1 (de) | Verfahren zur Herstellung von warmgewalztem, hochfestem Stahlblech zur Umformung und insbesondere zum Tiefziehen | |
| US6395109B1 (en) | Bar product, cylinder rods, hydraulic cylinders, and method for manufacturing | |
| JPS6159379B2 (de) | ||
| JP6465206B2 (ja) | 熱間圧延棒線材、部品および熱間圧延棒線材の製造方法 | |
| CA2714218A1 (fr) | Procede de fabrication de toles d'acier inoxydable austenitique a hautes caracteristiques mecaniques, et toles ainsi obtenues | |
| JP3255612B2 (ja) | 超快削鋼棒線材の製造方法及びそれによる超快削鋼棒線材 | |
| EP0991789B1 (de) | Zusammensetzung von werkzeugstahl | |
| EP1565587B1 (de) | Gebrauchsfertiges mechanisches teil aus stahl mit niedrigem kohlenstoffgehalt fur plastische verformung und herstellungsverfahren | |
| EP0092629B1 (de) | Verfahren zur Herstellung von Stäben und Röhren aus Stählen mit hohen mechanischen Eigenschaften | |
| EP0550294B1 (de) | Rohfabrikate grosser Länge für Herstellungsverfahren durch Kaltumformen, insbesondere für Kaltstauchen von formgebend bearbeitete Erzeugnisse wie Bolzen, und Verfahren zur Herstellung dieser kaltgeformten Gegenstände | |
| JP3256184B2 (ja) | 超快削鋼棒線材及び部品の製造方法並びにそれらによる超快削鋼棒線材及び部品 | |
| EP2742165A1 (de) | Stahl zur herstellung aufgekohlter stahlteile, aus diesem stahl hergestellte aufgekohlte stahlteile und herstellungsverfahren dafür |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 19851206 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19881103 |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: HERITIER, BERNARD Inventor name: MAITREPIERRE, PHILIPPE Inventor name: ROFES-VERNIS, JAIME |