EP3556892A1 - Low alloy steel sheet having excellent strength and ductility - Google Patents
Low alloy steel sheet having excellent strength and ductility Download PDFInfo
- Publication number
- EP3556892A1 EP3556892A1 EP17881659.1A EP17881659A EP3556892A1 EP 3556892 A1 EP3556892 A1 EP 3556892A1 EP 17881659 A EP17881659 A EP 17881659A EP 3556892 A1 EP3556892 A1 EP 3556892A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- steel sheet
- low alloy
- alloy steel
- phase
- 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- Withdrawn
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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
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
-
- 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
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
- C22C38/18—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
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
-
- 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
- C21D2211/005—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
-
- 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
Definitions
- a low alloy steel sheet excellent in strength and ductility comprises, , in percent (%) by weight of the entire composition, 0.05 to 0.3 % of carbon (C), 0.7 to 2.5 % of silicon (Si), 8 to 12 % of manganese (Mn), 13 to 15.5 % of chromium (Cr), 0.5 to 3.0 % of copper (Cu), 0.1 to 0.2 % of nitrogen (N), 0.25 % or less of aluminum (Al), 0.25 % or less of tin (Sn), and the remainder of iron (Fe) and other inevitable impurities, wherein the microstructure of the low alloy steel sheet comprises at least one of a ferrite phase and a martensite phase at a volume fraction of 5% or less, and the remainder includes an austenite phase.
- the low alloy steel sheet may further comprise 0.2% or less of nickel (Ni).
- the low alloy steel sheet excellent in strength and ductility according to the embodiments of the present invention has a tensile strength of 650 MPa or more and an elongation of 40% or more by realizing a TRIP or TWIP phenomenon, and can be used for automobile parts or other structural materials .
- % refers to% by weight.
- Chromium is a representative ferrite-forming element and is an element that increases corrosion resistance. In particular, it is an element that greatly affects nitrogen solubility.
- the trace elements particularly S and P which are intergranular segregated elements.
- the amount of ferrite exceeds a certain amount, it is present in two phases of ferrite and austenite at a high temperature, resulting in deterioration of hot workability and a large amount of cracks are generated in hot rolling.
- some of the ferrite phases are present more than necessary in the manufacture of the final product, resulting in deterioration of mechanical properties.
- Nitrogen is a representative austenite forming element together with Ni and it is an element which improves the corrosion resistance of the material together with Cr and Mo.
- the minimum N content of which the effect of the addition of N is shown and improves the strength of the material with interstitial elements together with C is 0.1 %.
- pressure is applied to increase the solubility of N in order to dissolve a large amount of N in the material.
- Cr and Mn which are representative elements for increasing the solubility of N, are present in a large amount, the amount that can maximally dissolve N without applying atmospheric pressure is 0.2%. Therefore, it is preferable that the appropriate amount of N is limited within the range of 0.1 to 0.2%.
- Specimens of steels corresponding to the composition range of the composition according to the present invention were prepared, and the phase fraction, elongation, and tensile strength of the material were measured after hot rolling and hot rolled annealing.
- Table 1 below shows the alloy composition (wt%) for the experimental steel types.
- FIG. 5 is a photograph showing the microstructure of the inventive steel 2, in which an austenite phase and a residual martensite phase were observed.
- FIGS. 5 to 10 are representative microstructure photographs corresponding to Table 2. It can be confirmed that the measurement results in Table 2 and the observation results in FIGS. 5 to 10 are actually in agreement.
- FIG. 15 is a graph showing tensile test results of inventive steels and comparative steels according to an embodiment of the present invention.
- the elongation percentage was more than 40% and the tensile strength was 650 MPa or more.
- the values of the stress-strain curve and the tensile strength largely vary according to the deformation behavior of the main phase, austenite phase.
- the elongation can be secured not less than 40%, and the tensile strength is 1,200 MPa, which indicates that high strength can be secured.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020160169693A KR101903174B1 (ko) | 2016-12-13 | 2016-12-13 | 강도 및 연성이 우수한 저합금 강판 |
PCT/KR2017/005381 WO2018110779A1 (ko) | 2016-12-13 | 2017-05-24 | 강도 및 연성이 우수한 저합금 강판 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3556892A4 EP3556892A4 (en) | 2019-10-23 |
EP3556892A1 true EP3556892A1 (en) | 2019-10-23 |
Family
ID=62559145
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17881659.1A Withdrawn EP3556892A1 (en) | 2016-12-13 | 2017-05-24 | Low alloy steel sheet having excellent strength and ductility |
Country Status (6)
Country | Link |
---|---|
US (1) | US20200080178A1 (zh) |
EP (1) | EP3556892A1 (zh) |
JP (1) | JP2020509175A (zh) |
KR (1) | KR101903174B1 (zh) |
CN (1) | CN110062814A (zh) |
WO (1) | WO2018110779A1 (zh) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4036268A4 (en) * | 2019-10-29 | 2022-08-24 | Posco | AUSTENITIC STAINLESS STEEL HAVING A HIGHER LIMITING YIELD RATIO AND METHOD FOR ITS MANUFACTURE |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101952818B1 (ko) * | 2017-09-25 | 2019-02-28 | 주식회사포스코 | 강도 및 연성이 우수한 저합금 강판 및 이의 제조방법 |
CN110396691B (zh) * | 2019-08-27 | 2021-08-24 | 贵州大学 | 一种6061铝合金表面处理方法 |
KR102326684B1 (ko) * | 2019-09-17 | 2021-11-17 | 주식회사 포스코 | 크리프 강도와 고온 연성이 우수한 크롬강판 및 그 제조방법 |
KR102385472B1 (ko) * | 2020-04-22 | 2022-04-13 | 주식회사 포스코 | 고강도, 고성형의 저원가 오스테나이트계 스테인리스강 및 그 제조방법 |
Family Cites Families (21)
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JPS505968B1 (zh) * | 1970-04-30 | 1975-03-10 | ||
JPH0686645B2 (ja) * | 1989-05-31 | 1994-11-02 | 日本金属工業株式会社 | 熱間加工性に優れたニッケル節減型オーステナイト系ステンレス鋼 |
FR2766843B1 (fr) * | 1997-07-29 | 1999-09-03 | Usinor | Acier inoxydable austenitique comportant une tres faible teneur en nickel |
DE102005024029B3 (de) | 2005-05-23 | 2007-01-04 | Technische Universität Bergakademie Freiberg | Austenitischer Leichtbaustahl und seine Verwendung |
DE102005030413C5 (de) | 2005-06-28 | 2009-12-10 | Technische Universität Bergakademie Freiberg | Hochfester austenitisch-martensitischer Leichtbaustahl und seine Verwendung |
US7682471B2 (en) * | 2006-07-10 | 2010-03-23 | Trw Automotive U.S. Llc | Austenitic iron-based alloy |
JP5544633B2 (ja) * | 2007-07-30 | 2014-07-09 | 新日鐵住金ステンレス株式会社 | 衝撃吸収特性に優れた構造部材用オーステナイト系ステンレス鋼板 |
JP4976985B2 (ja) * | 2007-11-14 | 2012-07-18 | 株式会社神戸製鋼所 | 低温ねじれ特性に優れた線材・棒鋼の製造方法 |
JP5597006B2 (ja) * | 2010-03-26 | 2014-10-01 | 新日鐵住金ステンレス株式会社 | 構造部材用高強度および高延性オーステナイト系ステンレス鋼板およびその製造方法 |
JP2011219809A (ja) * | 2010-04-08 | 2011-11-04 | Honda Motor Co Ltd | 高強度鋼板 |
JP6056132B2 (ja) * | 2010-11-25 | 2017-01-11 | Jfeスチール株式会社 | 燃料タンク用オーステナイト・フェライト系二相ステンレス鋼 |
IT1403129B1 (it) | 2010-12-07 | 2013-10-04 | Ct Sviluppo Materiali Spa | Procedimento per la produzione di acciaio ad alto manganese con resistenza meccanica e formabilità elevate, ed acciaio così ottenibile. |
KR20120063793A (ko) * | 2010-12-08 | 2012-06-18 | 주식회사 포스코 | 가공성이 우수한 페라이트계 스테인레스강 |
JP5440672B2 (ja) * | 2011-09-16 | 2014-03-12 | Jfeスチール株式会社 | 加工性に優れた高強度鋼板およびその製造方法 |
WO2013107922A1 (en) * | 2012-01-20 | 2013-07-25 | Jl Materials Technology Oy | An austenitic stainless steel product and a method for manufacturing same |
JP5869922B2 (ja) * | 2012-03-09 | 2016-02-24 | 新日鐵住金ステンレス株式会社 | 面内異方性が小さいフェライト・オーステナイト2相ステンレス鋼板およびその製造方法 |
ITRM20120647A1 (it) * | 2012-12-19 | 2014-06-20 | Ct Sviluppo Materiali Spa | ACCIAIO INOSSIDABILE AUSTENITICO AD ELEVATA PLASTICITÀ INDOTTA DA GEMINAZIONE, PROCEDIMENTO PER LA SUA PRODUZIONE, E SUO USO NELLÂeuro¿INDUSTRIA MECCANICA. |
CN103205655A (zh) * | 2013-03-21 | 2013-07-17 | 宝钢不锈钢有限公司 | 一种含Sn奥氏体不锈钢及其制造方法 |
CN103966528A (zh) * | 2014-04-29 | 2014-08-06 | 宝钢不锈钢有限公司 | 一种含Sn奥氏体不锈钢及其制造方法 |
FI127274B (en) * | 2014-08-21 | 2018-02-28 | Outokumpu Oy | HIGH-STRENGTH AUSTENITE STAINLESS STEEL AND ITS PRODUCTION METHOD |
KR101668533B1 (ko) * | 2014-12-26 | 2016-10-24 | 주식회사 포스코 | 표면 품질이 우수한 듀플렉스 스테인리스강 |
-
2016
- 2016-12-13 KR KR1020160169693A patent/KR101903174B1/ko active IP Right Grant
-
2017
- 2017-05-24 WO PCT/KR2017/005381 patent/WO2018110779A1/ko unknown
- 2017-05-24 JP JP2019531716A patent/JP2020509175A/ja active Pending
- 2017-05-24 US US16/468,875 patent/US20200080178A1/en not_active Abandoned
- 2017-05-24 EP EP17881659.1A patent/EP3556892A1/en not_active Withdrawn
- 2017-05-24 CN CN201780076526.XA patent/CN110062814A/zh active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4036268A4 (en) * | 2019-10-29 | 2022-08-24 | Posco | AUSTENITIC STAINLESS STEEL HAVING A HIGHER LIMITING YIELD RATIO AND METHOD FOR ITS MANUFACTURE |
JP2023500839A (ja) * | 2019-10-29 | 2023-01-11 | ポスコ | 降伏比が向上したオーステナイト系ステンレス鋼及びその製造方法 |
Also Published As
Publication number | Publication date |
---|---|
CN110062814A (zh) | 2019-07-26 |
WO2018110779A1 (ko) | 2018-06-21 |
EP3556892A4 (en) | 2019-10-23 |
KR20180068088A (ko) | 2018-06-21 |
KR101903174B1 (ko) | 2018-10-01 |
US20200080178A1 (en) | 2020-03-12 |
JP2020509175A (ja) | 2020-03-26 |
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