US3764302A - Stainless steel - Google Patents

Stainless steel Download PDF

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Publication number
US3764302A
US3764302A US00194154A US3764302DA US3764302A US 3764302 A US3764302 A US 3764302A US 00194154 A US00194154 A US 00194154A US 3764302D A US3764302D A US 3764302DA US 3764302 A US3764302 A US 3764302A
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United States
Prior art keywords
steel
corrosion resistance
addition
machinability
stainless steel
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Expired - Lifetime
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US00194154A
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English (en)
Inventor
L Troselius
C Sparre
R Kiessling
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Sandvik AB
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Sandvik AB
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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
    • 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
    • C22C38/001—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
    • C22C38/18—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
    • C22C38/50—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
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese

Definitions

  • the present invention relates to a stainless steel alloy and more particularly to an acid-resistant free-machining steel having an essentially austenitic structure.
  • the steel according to the invention contains, in weight percentages, from traces up to 0.1% C, 10-20% Cr, 10- 15% Ni, 1-5% Mo, at least 0.1% S and/or Pb and/or Se and/ or Te, the sum of the contents of these elements being 0.1-0.9%, at least 0.2% Ti and/or Zr the sum of the contents of these elements being 0.2-1.5%, at the most 4% Cu, at the most 1% Si, at the most 2% Mn, the rest being iron besides normally present impurities.
  • Mo-content is at the lowest 1.5% and preferably at the most 4.0%.
  • Certain high grade steels according to the invention contain preferably at the most 0.05% C.
  • the steel according to the invention has well adjusted additions of the elements S respectively Pb, Se or Te and of Ti respectively Zr and preferably also of Cu.
  • the favorable effect particularly concerning the resistance to pitting which has been found by a certain addition of Cu in combination with Ti respectively Zr, is probably connected with deposition of CuS (in case of a sulphur alloyed steel) on the metal surface or immediately adjacent to the surface and to an enrichment of copper on the active steel surface, by which phenomenon the speed of corrosion decreases. It has then been found that the Cu content shall suitably be 03-35%.
  • the content of Cu should preferably be at the lowest 1.0% and at the most 3.0%.
  • the wear of the tool is a certain standard gauge of the suitability of diiferent steels for such cutting. Still more important, however, is the strength or toughness of the chips of the material. Too high a strength of the chips, which means bad chipbreaking, may prevent manufacturing of details in automatic machines because of tool breakage and troublesome chip handling. It has been found that the steel according to the invention has remarkably good working properties because of a very low toughness of the chips.
  • test included the following variants having analyses according to Table I:
  • the machinability tests specimens were solution-heattreated at 1050 C. and quenched before the test which latter included turning with feed 0.05 mm./rev. and cutting depth 0.75 mm.
  • the total tool material was high speed steel having a hardness of HRC 65. No cutting medium was used.
  • the result in the form of a wear diagram (vTcurves) is presented in FIG. 1. From the diagram it is obvious that the addition of S caused a considerably increased tool life at the cutting operation. It is also seen that the additions of Cu and Ti, which improved the corrosion resistance, did not have any essential efiect on the improvement obtained by the addition of S.
  • the toughness of the chips were determined by a method illustrated in FIG. 2.
  • the chip was bent first downwards and then upwards, in which the mark I meant breakage in the sector 90", the mark 2 breakage in the sector 90-180", the mark 3 breakage in the sector 180- 90 and so on according to FIG. 2.
  • the result is evident from Table III.
  • the preparation of the material included first melting and casting, after which the ingots were heated up to 1200 C. and hot worked to round bar having a diameter of 22 respectively 15 millimeters and flat bar steel having a cross-sectional dimension of 24 X 6 millimeters. From these billets there were made different kinds of test specimeans good corrosion resistance.) From the table it is The corrosion tests included measuring of polarization, passivity and weight loss.
  • Acid-resistant, free-machining, stainless steel having high corrosion resistance combined with excellent machinability in cutting in automatic machines and having essentially austenitic structure consisting essentially of the following composition in percentages by weight: from a trace up to 0.1% C; 10-20% Cr; 10-15% Ni; 15% M0; at least 0.1% of at least one member of the group consisting of S, Pb, Se and Te, the sum of the contents of these elements being 0.1-0.9%; at least 0.2% of at least one member of the group consisting of Ti and Zr the sum of the contents of these elements being 0.8-1.1%; 0.3-

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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)
US00194154A 1970-11-12 1971-11-01 Stainless steel Expired - Lifetime US3764302A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE15268/70A SE346813B (enExample) 1970-11-12 1970-11-12

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US3764302A true US3764302A (en) 1973-10-09

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US00194154A Expired - Lifetime US3764302A (en) 1970-11-12 1971-11-01 Stainless steel

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US (1) US3764302A (enExample)
SE (1) SE346813B (enExample)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4158606A (en) * 1977-01-27 1979-06-19 The United States Department Of Energy Austenitic stainless steel alloys having improved resistance to fast neutron-induced swelling
US4407673A (en) * 1980-01-09 1983-10-04 Korenko Michael K Solid solution strengthened duct and cladding alloy D9-B1
US5512238A (en) * 1995-06-07 1996-04-30 Crs Holdings, Inc. Free-machining austenitic stainless steel
US20080210344A1 (en) * 2004-12-23 2008-09-04 Sandvik Intellectual Property Ab Precipitation Hardenable Martensitic Stainless Steel

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2732694B1 (fr) * 1995-04-07 1997-04-30 Ugine Savoie Sa Acier inoxydable austenitique resulfure a usinabilite amelioree, utilise notamment dans le domaine de l'usinage a tres grande vitesse de coupe et le domaine du decolletage

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4158606A (en) * 1977-01-27 1979-06-19 The United States Department Of Energy Austenitic stainless steel alloys having improved resistance to fast neutron-induced swelling
US4407673A (en) * 1980-01-09 1983-10-04 Korenko Michael K Solid solution strengthened duct and cladding alloy D9-B1
US5512238A (en) * 1995-06-07 1996-04-30 Crs Holdings, Inc. Free-machining austenitic stainless steel
US20080210344A1 (en) * 2004-12-23 2008-09-04 Sandvik Intellectual Property Ab Precipitation Hardenable Martensitic Stainless Steel

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Publication number Publication date
SE346813B (enExample) 1972-07-17

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Date Code Title Description
AS Assignment

Owner name: SANTRADE LTD., ALPENQUAI 12, CH-6002, LUCERNE, SWI

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SANDVIK AKTIEBOLAG, A CORP. OF SWEDEN;REEL/FRAME:004085/0132

Effective date: 19820908