EP0031800A1 - Ausscheidungsgehärteter, austenitischer, rostfreier Stahl - Google Patents

Ausscheidungsgehärteter, austenitischer, rostfreier Stahl Download PDF

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Publication number
EP0031800A1
EP0031800A1 EP80850186A EP80850186A EP0031800A1 EP 0031800 A1 EP0031800 A1 EP 0031800A1 EP 80850186 A EP80850186 A EP 80850186A EP 80850186 A EP80850186 A EP 80850186A EP 0031800 A1 EP0031800 A1 EP 0031800A1
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EP
European Patent Office
Prior art keywords
steel
austenitic
nickel
chromium
precipitation hardenable
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.)
Granted
Application number
EP80850186A
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English (en)
French (fr)
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EP0031800B1 (de
Inventor
Frans Gustaf Stefan Angel
Nils Gunnar Eugén Malmgren
Barry Solly
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.)
Fagersta Stainless AB
Original Assignee
Fagersta AB
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Filing date
Publication date
Application filed by Fagersta AB filed Critical Fagersta AB
Publication of EP0031800A1 publication Critical patent/EP0031800A1/de
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Publication of EP0031800B1 publication Critical patent/EP0031800B1/de
Expired legal-status Critical Current

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    • 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

Definitions

  • This invention deals with an austenitic stainless, precipitation hardenable chromium-nickel-aluminium steel with good cold workability. By tempering the martensite obtained by cold working, quenching or in some cases cooling to subzero temperatures, precipitation hardening is obtained.
  • the new alloy can be produced as hot rolled products such as wire rod, bar, strip and plate.
  • Precipitation hardening of stainless steel using aluminium is a well-known technique. These steels can either be given an annealing treatment designed to raise the M s temperature so much that martensite is formed on quenching, or they can be annealed at a higher temperature giving an austenitic structure when quenched. In the latter case the steel can be subsequently cold worked, thus transforming the austenite into martensite. After one of these treatments the material can be precipitation hardened.
  • the main purpose of the present invention is thus to improve the workability in the cold condition of Cr-Ni-Al steels by lowering the M s and the M d30 temperatures sufficiently to ensure that good workability is obtained without at the same time lowering them so far that the austenite is not transformed to martensite when cold worked. Martensite is desirable in the final product since it raises the mechanical strength considerably.
  • Both heats were melted in a 10-ton high-frequency induction furnace, ingot teemed and rolled to billets. These were conditioned and rolled to wire rod, 0 6.0 mm for heat 3423-71 and 0 5.6 mm for heat 4029-71.
  • the wire rod was subjected to a normal anneal at 1050°C, pickled and inspected before being drawn to wire.
  • Heats 3423-71 (Table 1) and 3226-71 have been drawn from wire rod, 0 6.0 mm, using single drafts.
  • the tensile strength (R m ), yield strength (R e ), and reduction of area (Z) as measured by tensile testing are compared in Figure 1. It is apparent that the yield and tensile strengths increase more slowly for the alloy in the invention (continuous curve) thus causing the drawability, measured as maximum achievable area reduction, to increase from 75% to 92%.
  • the ductility measured as reduction of area is higher for the alloy in the invention over the whole range and particularly at large area reductions. It should be noted that stress cracks are completely absent in the material for area reductions as large as 92% compared with 17-7 PH where a definite risk of stress crack formation exists at area reductions as low as 45%.
  • Tempering treatment 30 minutes at 450°C.
  • the tempering treatment gives an increase of yield and tensile strengths of about 200 N/mm 2 for heat 3423-71 and about 400 N/mm 2 for heat 4029-71.
  • the large difference between these effects can be explained by the fact that wire rod from heat 3421-71 has not been worked sufficiently, i.e. the austenite has not been transformed to martensite insufficient quantities prior to tempering.
  • the alloy in this invention has mainly been developed in order to improve the cold workability of precipitation hardenable stainless Cr-Ni-Al steels.
  • the composition can be set so that annealing in the temperature range 600-950°C leads to a rise in the Ms temperature due to carbide precipitation.
  • the material can subsequently be cooled to ambient or subzero temperatures in order to obtain a transformation to martensite which can then be tempered.
  • a particularly interesting application is cold heading where tensile strengths as low as 540 - 560 N/mm 2 have been measured on material annealed at 1050°C. This is true for both heats 3423-71 and 4029-71.
  • the technical result of the invention is that the drawability is considerably improved at the same time as the precipitation hardening effect is retained. It is reasonable to assume that the good weldability can be improved by additions of zirconium and uranium instead of titanium. Since the'alloy has an extremely sluggish martensitic transformation in the annealed state the material can be stored and transported outdoors under cold weather conditions without risk of spontaneous martensite formation.
  • the alloy according to the invention is annealed within the temperature range 600 - 950°C, quenched and cooled to below room temperature. The alloy can then be precipitation hardened by tempering.
  • the alloy can also be quenched direct after hot rolling and subsequently cold worked and precipitation hardened by tempering.

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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 Steel (AREA)
  • Gasket Seals (AREA)
  • Exhaust Silencers (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
EP19800850186 1979-12-28 1980-12-10 Ausscheidungsgehärteter, austenitischer, rostfreier Stahl Expired EP0031800B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE7910719 1979-12-28
SE7910719A SE420623B (sv) 1979-12-28 1979-12-28 Austenitiskt, utskiljningsherdbart rostfritt krom- nickel- aluminiumstal

Publications (2)

Publication Number Publication Date
EP0031800A1 true EP0031800A1 (de) 1981-07-08
EP0031800B1 EP0031800B1 (de) 1983-12-14

Family

ID=20339661

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800850186 Expired EP0031800B1 (de) 1979-12-28 1980-12-10 Ausscheidungsgehärteter, austenitischer, rostfreier Stahl

Country Status (5)

Country Link
EP (1) EP0031800B1 (de)
JP (1) JPS56105457A (de)
DE (1) DE3065923D1 (de)
ES (1) ES8206655A1 (de)
SE (1) SE420623B (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2479854A1 (fr) * 1980-04-07 1981-10-09 Armco Inc Acier inoxydable, exempt de ferrite, apte au durcissement structural
US5202089A (en) * 1990-05-29 1993-04-13 Uddeholm Tooling Aktiebolag Precipitation-hardenable tool steel
WO2006125412A1 (de) * 2005-05-23 2006-11-30 Scheller Piotr R Austenitischer leichtbaustahl und seine verwendung
DE102006033973A1 (de) * 2006-07-20 2008-01-24 Technische Universität Bergakademie Freiberg Nichtrostender austenitischer Stahlguss und seine Verwendung
CN100464000C (zh) * 2007-06-12 2009-02-25 江阴康瑞不锈钢制品有限公司 奥氏体冷镦不锈钢及其钢丝的制造方法
CN102747307A (zh) * 2012-06-06 2012-10-24 兰州理工大学 高铝不锈钢板材及其轧制方法
WO2019208833A1 (en) * 2018-04-26 2019-10-31 Suzuki-Sumiden Stainless Steel Wire Co., Ltd. A steel wire, a method for manufacturing the same, and method for manufacturing a spring or medical wire products

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5993856A (ja) * 1982-11-18 1984-05-30 Nippon Seisen Kk ステンレス鋼細線
DE102005030413C5 (de) * 2005-06-28 2009-12-10 Technische Universität Bergakademie Freiberg Hochfester austenitisch-martensitischer Leichtbaustahl und seine Verwendung
JP5744678B2 (ja) * 2010-10-07 2015-07-08 新日鐵住金ステンレス株式会社 耐疲労性に優れた析出硬化型の準安定オーステナイト系ステンレス鋼線およびその製造方法
CN103447348A (zh) * 2013-07-25 2013-12-18 张家港市胜达钢绳有限公司 一种不锈钢线材的制造方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2505762A (en) * 1946-09-06 1950-05-02 Armco Steel Corp Stainless steel and method
US3071460A (en) * 1959-11-20 1963-01-01 Armco Steel Corp Stainless steel composition
US3117861A (en) * 1956-11-14 1964-01-14 Armco Steel Corp Stainless steel and article
US3253908A (en) * 1959-11-20 1966-05-31 Armco Steel Corp Stainless steel and method
US3347663A (en) * 1964-09-23 1967-10-17 Int Nickel Co Precipitation hardenable stainless steel
US3408178A (en) * 1967-06-27 1968-10-29 Carpenter Steel Co Age hardenable stainless steel alloy

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2505762A (en) * 1946-09-06 1950-05-02 Armco Steel Corp Stainless steel and method
US3117861A (en) * 1956-11-14 1964-01-14 Armco Steel Corp Stainless steel and article
US3071460A (en) * 1959-11-20 1963-01-01 Armco Steel Corp Stainless steel composition
US3253908A (en) * 1959-11-20 1966-05-31 Armco Steel Corp Stainless steel and method
US3347663A (en) * 1964-09-23 1967-10-17 Int Nickel Co Precipitation hardenable stainless steel
US3408178A (en) * 1967-06-27 1968-10-29 Carpenter Steel Co Age hardenable stainless steel alloy

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2479854A1 (fr) * 1980-04-07 1981-10-09 Armco Inc Acier inoxydable, exempt de ferrite, apte au durcissement structural
US5202089A (en) * 1990-05-29 1993-04-13 Uddeholm Tooling Aktiebolag Precipitation-hardenable tool steel
WO2006125412A1 (de) * 2005-05-23 2006-11-30 Scheller Piotr R Austenitischer leichtbaustahl und seine verwendung
DE102006033973A1 (de) * 2006-07-20 2008-01-24 Technische Universität Bergakademie Freiberg Nichtrostender austenitischer Stahlguss und seine Verwendung
CN100464000C (zh) * 2007-06-12 2009-02-25 江阴康瑞不锈钢制品有限公司 奥氏体冷镦不锈钢及其钢丝的制造方法
CN102747307A (zh) * 2012-06-06 2012-10-24 兰州理工大学 高铝不锈钢板材及其轧制方法
WO2019208833A1 (en) * 2018-04-26 2019-10-31 Suzuki-Sumiden Stainless Steel Wire Co., Ltd. A steel wire, a method for manufacturing the same, and method for manufacturing a spring or medical wire products
CN112041474A (zh) * 2018-04-26 2020-12-04 铃木住电不锈钢株式会社 钢丝、制造钢丝的方法以及制造弹簧或医用丝制品的方法
JP2021519868A (ja) * 2018-04-26 2021-08-12 鈴木住電ステンレス株式会社 鋼線、その製造方法、及びばねまたは医療用線製品の製造方法
EP3784812A4 (de) * 2018-04-26 2022-01-19 Suzuki-Sumiden Stainless Steel Wire Co., Ltd. Stahldraht, verfahren zu seiner herstellung und verfahren zur herstellung einer feder oder medizinischer drahtprodukte
US11767585B2 (en) 2018-04-26 2023-09-26 Suzuki-Sumiden Stainless Steel Wire Co., Ltd Steel wire, a method for manufacturing the same, and method for manufacturing a spring or medical wire products

Also Published As

Publication number Publication date
SE7910719L (sv) 1981-06-29
DE3065923D1 (en) 1984-01-19
SE420623B (sv) 1981-10-19
EP0031800B1 (de) 1983-12-14
JPS56105457A (en) 1981-08-21
ES498616A0 (es) 1982-08-01
ES8206655A1 (es) 1982-08-01

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