EP1563109B1 - Piece d'acier de construction soudable et procede de fabrication - Google Patents

Piece d'acier de construction soudable et procede de fabrication Download PDF

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Publication number
EP1563109B1
EP1563109B1 EP03789464A EP03789464A EP1563109B1 EP 1563109 B1 EP1563109 B1 EP 1563109B1 EP 03789464 A EP03789464 A EP 03789464A EP 03789464 A EP03789464 A EP 03789464A EP 1563109 B1 EP1563109 B1 EP 1563109B1
Authority
EP
European Patent Office
Prior art keywords
temperature
steel
less
bainitic
weldable
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.)
Expired - Lifetime
Application number
EP03789464A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1563109A1 (fr
Inventor
Jean Beguinot
Jean-Georges Brisson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Industeel Creusot
Original Assignee
Industeel Creusot
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Industeel Creusot filed Critical Industeel Creusot
Priority to SI200330932T priority Critical patent/SI1563109T1/sl
Publication of EP1563109A1 publication Critical patent/EP1563109A1/fr
Application granted granted Critical
Publication of EP1563109B1 publication Critical patent/EP1563109B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/002—Bainite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

Definitions

  • the present invention relates to weldable structural steel parts and their method of manufacture.
  • the structural steels must have a certain level of mechanical characteristics to be adapted to the use that one wishes to make, and they must in particular have a high hardness.
  • steels are used that can be quenched, that is to say for which one can obtain a martensitic or bainitic structure when cooled sufficiently quickly and efficiently.
  • a bainitic critical velocity is thus defined, beyond which a bainitic, martensitic or martensite-bainitic structure is obtained, as a function of the cooling rate reached.
  • the quenchability of these steels depends on their content of quenching elements. In general, the more these elements are present in large quantities, the lower the bainitic critical speed is low.
  • the welding zone also known as the Zone Affectée Thermiquement or ZAT
  • ZAT Zone Affectée Thermiquement
  • micro-alloyed boron grades were then developed, taking advantage of the fact that, in particular, the quenching efficiency of this element decreases when the austenitization temperature increases.
  • the ZAT is less soaking than it would be in a grade of the same quenchability without boron, and it can thus reduce hardenability and hardness of this ZAT.
  • the object of the present invention is to overcome this drawback by proposing a structural steel having improved quenchability without reducing its weldability.
  • the chemical composition of the steel of the piece according to the invention also satisfies the relationship: 1 , 1 % mn + 0 , 7 % Or + 0 , 6 % Cr + 1 , 5 ⁇ % MB + % W / 2 ⁇ 1 , preferably ⁇ 2
  • the chemical composition of the steel of the piece according to the invention furthermore satisfies the relationship: % Cr + 3 ⁇ % MB + % W / 2 ⁇ 1 , 8 preferably ⁇ 2 , 0.
  • the cooling rate may be slowed down, in particular to promote a phenomenon of self-income and the retention of 3 % to 20% residual austenite.
  • the cooling rate between 500 ° C and a temperature less than or equal to 200 ° C will then be between 0.07 ° C / s and 5 ° C / s; more preferably between 0.15 ° C / s and 2.5 ° C / s.
  • an income is made at a temperature below 300 ° C for a time less than 10 hours, after cooling to a temperature of less than or equal to 200 ° C.
  • the process according to the invention does not comprise any income after the cooling of the part to a temperature of less than or equal to 200 ° C.
  • the part subjected to the process according to the invention is a sheet of thickness between 3 and 150 mm.
  • the third subject of the invention is a process for manufacturing a weldable steel sheet according to the invention, whose thickness is between 3 mm and 150 mm, and which is characterized in that a quenching of said sheet, the cooling rate V R at the core of the sheet between 800 ° C and 500 ° C, expressed in ° C / hour, and the composition of the steel being such that: 1 , 1 % mn + 0 , 7 % Or + 0 , 6 % Cr + 1 , 5 ⁇ % MB + % W / 2 + log V R ⁇ 5 , 5 , and preferably ⁇ 6, log being the logarithmic decimal.
  • the present invention is based on the new finding that the addition of silicon in the contents indicated above makes it possible to increase the quenching effect of boron by 30 to 50%. This synergy intervenes without increase the amount of boron added, while the silicon does not have a significant soaking effect in the absence of boron.
  • the improvement of the quenchability makes it possible to cool the pieces more slowly, while guaranteeing an essentially bainitic, martensitic or martensite-bainitic structure.
  • This slower cooling combined with a sufficient content of carburigenic elements then allows the precipitation of fine carbides of chromium, molybdenum and / or tungsten by a so-called self-tempering phenomenon.
  • This phenomenon of self-income is, moreover, greatly favored by the slowing down of the cooling rate below 500 ° C.
  • this slowdown also favors the retention of austenite, preferably in a proportion of between 3% and 20%.
  • the manufacturing process is thus simplified while improving the mechanical characteristics of the steel, which no longer undergoes significant softening due to high temperature tempering, as is customary. However, it remains possible to make such an income at the usual temperatures, that is to say less than or equal to Ac 1 .
  • a steel according to the invention is produced, it is cast in the form of a half product which is then shaped by hot plastic deformation, for example by rolling or forging.
  • the part thus obtained is then austenitized by heating at a temperature above Ac 3 but below 1000 ° C., and preferably below 950 ° C., and then cooled to room temperature so that, at the heart of the piece, the cooling rate between 800 ° C and 500 ° C is greater than the bainitic critical speed.
  • the austenitization temperature is limited to 1000 ° C., since beyond this, the quenching effect of the boron becomes too weak.
  • the part is then optionally subjected to a conventional feed at a temperature of less than or equal to Ac 1 , but it is preferred to limit the temperature to 300 ° C., or even to eliminate this step. Indeed, the absence of income can be, possibly, compensated by a phenomenon of self-income. This is particularly favored by allowing a cooling rate at low temperature (ie below 500 ° C approximately) preferably between 0.07 ° C / s and 5 ° C / s; more preferably between 0.15 ° C / s and 2.5 ° C / s.
  • a piece is thus obtained, and in particular a weldable sheet made of steel having a bainitic, martensitic or martensitic-bainitic core structure, comprising from 3 to 20% of residual austenite.
  • the presence of residual austenite is of particular interest with regard to the behavior of steel during welding. Indeed, in order to limit the risk of welding cracking, and in addition to the abovementioned reduction in the hardenability of the ZAT, the presence of residual austenite in the base metal, in the vicinity of the ZAT, makes it possible to fix a part of dissolved hydrogen, possibly introduced by the welding operation, hydrogen which, if it were not so fixed, would increase the risk of cracking.
  • ingotins have been manufactured with steels 1 and 2 in accordance with the invention, and with steels A and B according to the prior art, the compositions of which are, in thousandths of a% by weight, and the exception of iron: VS Yes B mn Or Cr MB W V Nb Ti al NOT 1 415 870 2 1150 510 1110 450 - - - - 55 6 AT 420 315 3 1150 520 1130 460 - - - - 52 5 2 450 830 3 715 1410 1450 410 230 65 38 32 25 6 B 460 280 3 720 1430 1470 425 240 63 42 31 27 6
  • V1 From this velocity V1 are deduced the maximum sheet thicknesses that can be obtained while maintaining a substantially martensitic core structure and also comprising at least 3% residual austenite. These thicknesses were determined in the case of quenching in air (A), oil (H) and water (E).
  • ingot V1 (° C / h) Thickness max. (Mm) C eq (%) AT H E L1 8,800 7 60 100 0.95 THE 15,000 4 40 75 0.91 L2 5000 13 80 120 1.07 LB 8200 8 55 85 1.09

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Separation Of Gases By Adsorption (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
EP03789464A 2002-11-19 2003-11-13 Piece d'acier de construction soudable et procede de fabrication Expired - Lifetime EP1563109B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI200330932T SI1563109T1 (sl) 2002-11-19 2003-11-13 Kos konstrukcijskega jekla, ki se da variti, in postopek za izdelavo

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0214423 2002-11-19
FR0214423A FR2847274B1 (fr) 2002-11-19 2002-11-19 Piece d'acier de construction soudable et procede de fabrication
PCT/FR2003/003360 WO2004048630A1 (fr) 2002-11-19 2003-11-13 Piece d'acier de construction soudable et procede de fabrication

Publications (2)

Publication Number Publication Date
EP1563109A1 EP1563109A1 (fr) 2005-08-17
EP1563109B1 true EP1563109B1 (fr) 2007-08-01

Family

ID=32187694

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03789464A Expired - Lifetime EP1563109B1 (fr) 2002-11-19 2003-11-13 Piece d'acier de construction soudable et procede de fabrication

Country Status (22)

Country Link
US (2) US11060171B2 (pt)
EP (1) EP1563109B1 (pt)
JP (1) JP4535878B2 (pt)
KR (1) KR101010595B1 (pt)
CN (1) CN100352966C (pt)
AR (1) AR042070A1 (pt)
AT (1) ATE368755T1 (pt)
AU (1) AU2003294048B2 (pt)
BR (1) BR0315695B1 (pt)
CA (1) CA2506352C (pt)
DE (1) DE60315339T2 (pt)
DK (1) DK1563109T3 (pt)
ES (1) ES2293075T3 (pt)
FR (1) FR2847274B1 (pt)
PE (1) PE20040488A1 (pt)
PL (1) PL209396B1 (pt)
PT (1) PT1563109E (pt)
RU (1) RU2336363C2 (pt)
SI (1) SI1563109T1 (pt)
UA (1) UA81929C2 (pt)
WO (1) WO2004048630A1 (pt)
ZA (1) ZA200503962B (pt)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100412220C (zh) * 2006-04-03 2008-08-20 宜昌黑旋风锯业有限责任公司 一种金刚石锯片基体钢
KR101067896B1 (ko) * 2007-12-06 2011-09-27 주식회사 포스코 강도 및 연성이 우수한 고탄소 강판 및 그 제조 방법
RU2458177C1 (ru) * 2010-12-03 2012-08-10 Открытое акционерное общество "Магнитогорский металлургический комбинат" Прокат полосовой из борсодержащей марганцовистой стали
RU2445396C1 (ru) * 2011-04-18 2012-03-20 Юлия Алексеевна Щепочкина Конструкционная сталь
CL2012002218A1 (es) * 2012-08-09 2013-07-26 Compañia Electro Metalurgica S A Metodo de produccion de acero fundido de alta resistencia al desgaste con microestructura mayoritariamente bainitica y balance adecuado de tenacicdad y dureza para aplicaciones mineras tales como molienda y chancado; y acero con dichas caracteristicas.
CN104213048A (zh) * 2014-08-05 2014-12-17 安徽荣达阀门有限公司 一种水压阀用合金钢材料及其制备方法
CN104630650A (zh) * 2015-02-06 2015-05-20 铜陵百荣新型材料铸件有限公司 一种耐低温高强度弹簧钢及其制备方法
KR101642421B1 (ko) 2015-03-06 2016-08-11 국민대학교산학협력단 구조용강 조성물
CN108474080B (zh) * 2015-11-16 2021-09-21 本特勒尔钢管有限公司 具有高能量吸收能力的钢合金和钢管产品
DE102016203969A1 (de) * 2016-03-10 2017-09-14 Thyssenkrupp Ag Verfahren zur Wärmebehandlung eines Flachproduktes aus Stahl, wärmebehandeltes Flachprodukt aus Stahl sowie seine Verwendung
FR3103498B1 (fr) * 2019-11-22 2021-12-10 Electricite De France Pièce massive métallique et son procédé de fabrication
KR20220000131A (ko) * 2020-06-25 2022-01-03 국방과학연구소 고인성 고경도강 합금 및 그 제조방법

Family Cites Families (12)

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Publication number Priority date Publication date Assignee Title
US4171233A (en) * 1978-05-22 1979-10-16 Bethlehem Steel Corporation Lens quality of die steel
JPH0236648B2 (ja) * 1983-06-23 1990-08-20 Nisshin Steel Co Ltd Kokyodokoenseikonoseiho
US4673433A (en) * 1986-05-28 1987-06-16 Uddeholm Tooling Aktiebolag Low-alloy steel material, die blocks and other heavy forgings made thereof and a method to manufacture the material
JPH05320749A (ja) * 1992-05-20 1993-12-03 Nisshin Steel Co Ltd 超高強度鋼の製造方法
JPH06299242A (ja) * 1993-04-09 1994-10-25 Kawatetsu Techno Wire Kk 遅れ破壊特性及び機械的性質の優れたｐｃ鋼材の製造方法
GB2297094B (en) * 1995-01-20 1998-09-23 British Steel Plc Improvements in and relating to Carbide-Free Bainitic Steels
FR2729974B1 (fr) * 1995-01-31 1997-02-28 Creusot Loire Acier a haute ductilite, procede de fabrication et utilisation
FR2748036B1 (fr) * 1996-04-29 1998-05-22 Creusot Loire Acier faiblement allie pour la fabrication de moules pour matieres plastiques
BE1011149A3 (fr) * 1997-05-12 1999-05-04 Cockerill Rech & Dev Acier ductile a haute limite elastique et procede de fabrication de cet acier.
TW567233B (en) * 2001-03-05 2003-12-21 Kiyohito Ishida Free-cutting tool steel
FR2847270B1 (fr) * 2002-11-19 2004-12-24 Usinor Procede pour fabriquer une tole en acier resistant a l'abrasion et tole obtenue
FR2960883B1 (fr) * 2010-06-04 2012-07-13 Vallourec Mannesmann Oil & Gas Acier faiblement allie a limite d'elasticite elevee et haute resistance a la fissuration sous contrainte par les sulfures

Also Published As

Publication number Publication date
PE20040488A1 (es) 2004-08-18
SI1563109T1 (sl) 2007-10-31
ATE368755T1 (de) 2007-08-15
ZA200503962B (en) 2006-08-30
RU2005119210A (ru) 2006-01-20
BR0315695A (pt) 2005-09-20
FR2847274B1 (fr) 2005-08-19
AR042070A1 (es) 2005-06-08
DE60315339T2 (de) 2008-04-17
BR0315695B1 (pt) 2013-07-30
CN100352966C (zh) 2007-12-05
CA2506352C (fr) 2011-05-10
EP1563109A1 (fr) 2005-08-17
AU2003294048B2 (en) 2008-10-16
PL209396B1 (pl) 2011-08-31
PL375545A1 (en) 2005-11-28
PT1563109E (pt) 2007-10-18
WO2004048630A1 (fr) 2004-06-10
US11060171B2 (en) 2021-07-13
US11279994B2 (en) 2022-03-22
KR101010595B1 (ko) 2011-01-25
JP2006506529A (ja) 2006-02-23
KR20050075034A (ko) 2005-07-19
DE60315339D1 (de) 2007-09-13
JP4535878B2 (ja) 2010-09-01
FR2847274A1 (fr) 2004-05-21
DK1563109T3 (da) 2007-10-08
RU2336363C2 (ru) 2008-10-20
AU2003294048A1 (en) 2004-06-18
US20200332402A1 (en) 2020-10-22
US20070079912A1 (en) 2007-04-12
ES2293075T3 (es) 2008-03-16
CA2506352A1 (fr) 2004-06-10
CN1714165A (zh) 2005-12-28
UA81929C2 (uk) 2008-02-25

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