MA56172A - COLD ROLLED MARTENSITIC STEEL AND METHOD OF MAKING MARTENSITIC STEEL THEREOF - Google Patents

COLD ROLLED MARTENSITIC STEEL AND METHOD OF MAKING MARTENSITIC STEEL THEREOF

Info

Publication number
MA56172A
MA56172A MA056172A MA56172A MA56172A MA 56172 A MA56172 A MA 56172A MA 056172 A MA056172 A MA 056172A MA 56172 A MA56172 A MA 56172A MA 56172 A MA56172 A MA 56172A
Authority
MA
Morocco
Prior art keywords
martensitic steel
cold rolled
making
steel
martensitic
Prior art date
Application number
MA056172A
Other languages
French (fr)
Inventor
Aurélie Esnaut
Original Assignee
Arcelormittal
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 Arcelormittal filed Critical Arcelormittal
Publication of MA56172A publication Critical patent/MA56172A/en

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
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • 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
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C21D1/22—Martempering
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0273—Final recrystallisation annealing
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • 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
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • 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
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • 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
    • C21D2211/005—Ferrite
    • 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

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 Sheet Steel (AREA)
  • Heat Treatment Of Steel (AREA)
MA056172A 2019-06-12 2020-06-05 COLD ROLLED MARTENSITIC STEEL AND METHOD OF MAKING MARTENSITIC STEEL THEREOF MA56172A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2019/054901 WO2020250009A1 (en) 2019-06-12 2019-06-12 A cold rolled martensitic steel and a method of martensitic steel thereof

Publications (1)

Publication Number Publication Date
MA56172A true MA56172A (en) 2022-04-20

Family

ID=66951997

Family Applications (1)

Application Number Title Priority Date Filing Date
MA056172A MA56172A (en) 2019-06-12 2020-06-05 COLD ROLLED MARTENSITIC STEEL AND METHOD OF MAKING MARTENSITIC STEEL THEREOF

Country Status (11)

Country Link
US (1) US20220298614A1 (en)
EP (1) EP3983568A1 (en)
JP (1) JP2022537932A (en)
KR (1) KR20220005572A (en)
CN (1) CN113811624B (en)
BR (1) BR112021021695A2 (en)
CA (1) CA3139633A1 (en)
MA (1) MA56172A (en)
MX (1) MX2021015171A (en)
WO (2) WO2020250009A1 (en)
ZA (1) ZA202108295B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023073411A1 (en) * 2021-10-29 2023-05-04 Arcelormittal Cold rolled and heat treated steel sheet and a method of manufacturing thereof
CA3233088A1 (en) * 2021-10-29 2023-05-04 Arcelormittal Cold rolled and heat treated steel sheet and a method of manufacturing thereof
WO2023223078A1 (en) * 2022-05-19 2023-11-23 Arcelormittal A martensitic steel sheet and a method of manunfacturing thereof
WO2024105428A1 (en) * 2022-11-14 2024-05-23 Arcelormittal High toughness press-hardened steel part and method of manufacturing the same
WO2024105429A1 (en) * 2022-11-14 2024-05-23 Arcelormittal High toughness press-hardened steel part and method of manufacturing the same

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3837400C2 (en) * 1988-11-01 1995-02-23 Mannesmann Ag Process for the production of seamless pressure vessels
JPH0841535A (en) * 1994-07-29 1996-02-13 Nippon Steel Corp Production of high hardness wear resistant steel excellent in low temperature toughness
CN101928875A (en) * 2009-06-22 2010-12-29 鞍钢股份有限公司 High-strength cold-rolled plate with favorable forming property and preparation method thereof
JP5655356B2 (en) * 2010-04-02 2015-01-21 Ｊｆｅスチール株式会社 Wear-resistant steel plate with excellent low-temperature temper embrittlement cracking
JP5126399B2 (en) * 2010-09-06 2013-01-23 Ｊｆｅスチール株式会社 High-strength cold-rolled steel sheet with excellent stretch flangeability and manufacturing method thereof
IN2014CN04908A (en) * 2011-11-28 2015-09-18 Arcelormittal Lnvestigacion Y Desarrollo S L
JP5966730B2 (en) * 2012-07-30 2016-08-10 Ｊｆｅスチール株式会社 Abrasion resistant steel plate with excellent impact wear resistance and method for producing the same
JP5821911B2 (en) * 2013-08-09 2015-11-24 Ｊｆｅスチール株式会社 High yield ratio high strength cold-rolled steel sheet and method for producing the same
CN103469112A (en) * 2013-09-29 2013-12-25 宝山钢铁股份有限公司 High-formability cold rolling bi-phase strip steel and manufacture method thereof
WO2015088523A1 (en) * 2013-12-11 2015-06-18 ArcelorMittal Investigación y Desarrollo, S.L. Cold rolled and annealed steel sheet
HUE046359T2 (en) * 2013-12-11 2020-03-30 Arcelormittal Martensitic steel with delayed fracture resistance and manufacturing method
KR101568549B1 (en) * 2013-12-25 2015-11-11 주식회사 포스코 Steel sheet for hot press formed product having high bendability and ultra high strength, hot press formed product using the same and method for manufacturing the same
MX2017007511A (en) * 2014-12-12 2017-08-22 Jfe Steel Corp High-strength cold-rolled steel sheet and method for producing same.
JP6245220B2 (en) * 2015-05-29 2017-12-13 Ｊｆｅスチール株式会社 Abrasion resistant steel plate with excellent low temperature toughness and corrosion wear resistance
WO2016198906A1 (en) * 2015-06-10 2016-12-15 Arcelormittal High-strength steel and method for producing same
KR101725274B1 (en) * 2015-10-16 2017-04-10 삼화스틸(주) Steel plate with high tensile strength and process for the same
WO2017125773A1 (en) * 2016-01-18 2017-07-27 Arcelormittal High strength steel sheet having excellent formability and a method of manufacturing the same
WO2018115935A1 (en) * 2016-12-21 2018-06-28 Arcelormittal Tempered and coated steel sheet having excellent formability and a method of manufacturing the same

Also Published As

Publication number Publication date
WO2020250098A1 (en) 2020-12-17
US20220298614A1 (en) 2022-09-22
CA3139633A1 (en) 2020-12-17
ZA202108295B (en) 2022-08-31
KR20220005572A (en) 2022-01-13
BR112021021695A2 (en) 2021-12-21
WO2020250009A1 (en) 2020-12-17
CN113811624B (en) 2023-10-20
MX2021015171A (en) 2022-01-18
JP2022537932A (en) 2022-08-31
CN113811624A (en) 2021-12-17
EP3983568A1 (en) 2022-04-20

Similar Documents

Publication Publication Date Title
MA55949A (en) COLD ROLLED MARTENSITIC STEEL AND METHOD OF MAKING MARTENSITIC STEEL THEREOF
MA56172A (en) COLD ROLLED MARTENSITIC STEEL AND METHOD OF MAKING MARTENSITIC STEEL THEREOF
MA54523A (en) HEAT TREATED COLD ROLLED STEEL SHEET AND METHOD OF MANUFACTURING THEREOF
MA47018A (en) HIGH STRENGTH AND HIGH FORMABILITY STEEL SHEET HEAT TREATED AND COLD ROLLED AS WELL AS ITS MANUFACTURING PROCESS
MA51001A (en) ANCHORED COLD ROLLED STEEL SHEET AND ITS MANUFACTURING PROCESS
MA50556A (en) COLD ROLLED SHEET AND ITS MANUFACTURING PROCESS
MA50999A (en) COLD ROLLED AND ANNUAL STEEL SHEET AND ITS MANUFACTURING PROCESS
MA56012A (en) COLD ROLLED COATED STEEL SHEET AND METHOD OF MAKING IT
MA54718A (en) METHOD FOR PRODUCING HIGH-STRENGTH STEEL SHEET HAVING IMPROVED DUCTILITY AND FORMABILITY AND STEEL SHEET SO OBTAINED
MA53640A (en) COLD ROLLED COATED STEEL SHEET AND METHOD OF MAKING IT
MA54371A (en) COLD ROLLED AND ANNEALED STEEL SHEET, METHOD FOR PRODUCTION, AND USE OF SUCH STEEL TO PRODUCE VEHICLE PARTS
MA51296A (en) HIGH STRENGTH AND HIGH FORMABILITY STEEL SHEET AND MANUFACTURING PROCESS
MA43659A (en) HIGH STRENGTH STEEL SHEET SHOWING EXCELLENT FORMATABILITY AND MANUFACTURING PROCESS
MA45131A (en) COLD ROLLED AND ANNUAL STEEL SHEET, ITS PRODUCTION PROCESS AND USE OF SUCH STEEL TO PRODUCE VEHICLE PARTS
ZA201903335B (en) High-strength cold rolled steel sheet having high formability and a method of manufacturing thereof
MA45147A (en) COLD ROLLED AND ANNUAL STEEL SHEET, ITS PRODUCTION PROCESS AND USE OF SUCH STEEL TO PRODUCE VEHICLE PARTS
MA53708A (en) HOT ROLLED STEEL SHEET AND METHOD OF MANUFACTURING THEREOF
MA51269A (en) COLD ROLLED AND COATED STEEL SHEET AND ITS MANUFACTURING PROCESS
EP3549760A4 (en) Rolled composite steel plate of super austenitic stainless steel and manufacturing method therefor
GB202105873D0 (en) Austenite low temperature steel and preparation method therefor
MA49159A (en) PROCESS FOR THE PRODUCTION OF A HIGH STRENGTH STEEL SHEET WITH IMPROVED STRENGTH AND FORMABILITY AND HIGH STRENGTH STEEL SHEET THUS OBTAINED
FI3707289T3 (en) Cold rolled and heat treated steel sheet and a method of manufacturing thereof
ZA202005177B (en) Forged part of bainitic steel and a method of manufacturing thereof
MA46407A (en) HIGH DUCTILITY VARIABLE PERIODIC ALLOY PROTECTIVE FILM AND ITS FORMATION PROCESS
SI3719148T1 (en) High-hardness steel product and method of manufacturing the same