US3385740A - Weldable and hardenable steel and method of producing same - Google Patents

Weldable and hardenable steel and method of producing same Download PDF

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Publication number
US3385740A
US3385740A US644450A US64445067A US3385740A US 3385740 A US3385740 A US 3385740A US 644450 A US644450 A US 644450A US 64445067 A US64445067 A US 64445067A US 3385740 A US3385740 A US 3385740A
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Prior art keywords
steel
weldable
austenite
molybdenum
percent
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US644450A
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English (en)
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Baggstrom Karl Gote
Persson Karl Gerhard Sune
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Saab Bofors AB
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Bofors 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
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten

Definitions

  • the remainder being essentially iron, to efiect complete austenization, cooling to room temperature, and tempering at a temperature between about 550 to 650 C.
  • the present invention relates to a weldable and hardenable steel with a high corrosion resistance in combination with good strength and toughness, and to a method of producing said steel.
  • the weldable and hardenable steel with a high corrosion resistance in combination with good strength and toughness of the present invention is an alloy of the following composition:
  • the alloy can particularly have the following composition:
  • complete austenitization means the conversion of all constituents into austenite when the steel is kept at the elevated temperature.
  • the steel has a complete austenite constitution after this heating as long as it is kept at this temperature, but on cooling this constitution is often altered.
  • steels which also after cooling have an austenitic constitution, and examples of these are the so-called 18/8 steels containing about 18% Cr and 8% Ni.
  • These austenitic stainless steels are disclosed in Melill (US. Patent No. 3,061,487). In other types of steels the austenitic constitution at the elevated temperature is transformed into martensite on cooling, and steels of this type are also discussed in the patent of Melill.
  • the steels of Melill are of the semi-austenitic type, which means that they to some extent contain austenite when they are cooled from the complete austenitization heat treatment, and these semi-austenitic steels must be subjected to a specific heat treatment of 4-5 steps to be transformed into the desired final substantially martensitic structure.
  • the steel according to this invention is only heated to complete austenitization and air cooled, whereby a substantially martensitic structure is obtained, and afterwards it is reheated to between 550 and 650 C., whereby a stable austenite dispersed in a martensite matrix is produced in an amount of about 15-40%.
  • steels of specified composition which upon heat treatment and subsequent cooling are transformed into weldable and hardenable steels having high corrosion resistance.
  • FIGURE 1 is a photomicrograph (X200) of a steel having the composition of a steel of this invention, and treated according to the method of this invention.
  • FIGURE 2 is a'photomicrograph (X200) of the same steel which has been treated by a different method.
  • Percent was melted in a reduced arc furnace and then cast to a 26 inch ingot with a weight of about 6 tons.
  • the ingot was rolled to a mm. thick plate with the size of 4600 x 1500 x 100 mm. This plate was heated to 980 C. for one hour and then cooled in air. From the plate test pieces of about 10 x 10 x 20 mm. were then cut out, and the austenite content is determined by X-ray analysis 3 and photomicrographs prepared. From X-ray measurements it was shown that there is no austenite present in this steel. The photomizrograph taken of this steel is shown in FIGURE 2, and in this photomicrograph only martensitic needles can be identified.
  • a test piece from the steel as treated above was then subjected to a tempering at 600 C. during hours and afterwards to air-cooling.
  • X-ray measurements of this steel showed it to contain about austenite.
  • the photomicrograph of this steel is shown in FIGURE 1.
  • the microstructure only showed martensitic needles, in spite of the fact that said steel contains 30% austenite, as determined by X-ray analysis. This indicated that the austenite is dispersed in the martensitic matrix and this distribution of the austenite gives the very unexpected 15 and valuable properties to the steels of this invention.
  • Table I shows the results of some corrosion tests which included, among others, steel according to the present invention.
  • a heat treated, weldable. corrosion-resistant austenitic-martensitic steel containing about 15 to 40% austenite dispersed in a martensite martix, which consists essentially of:
  • the balance essentially iron, wherein the ratio between the nickel equivalent, calculated as (percent Ni+0.5% Mn), and the chromium equivalent, calculated as [(percent Cr15% C)+1.5 percent Si+ percent M0] is in the range of about 0.3 to 0.9.
  • Method of producing a steel as defined in claim 1 which comprises heating a steel of the composition as 5 6 defined in claim 1 to effect complete austenizing thereof, References Cited cooling to room temperature, and tempering said steel UNITED STATES PATENTS at a temperature between about 550 to 650 C., thereby producing a stable austenite therein in an amount of 1,404,907 1/1922 Strauss 148136 X about15t040% 5 2,802,755 8/1957 Bloom 7s 12s 3,061,487 10/1962 Melill et al. 148143 6. Method according to claim 5, wherein the molybdenum content of the steel is 1.02.0%.

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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)
  • Heat Treatment Of Articles (AREA)
US644450A 1963-01-05 1967-06-05 Weldable and hardenable steel and method of producing same Expired - Lifetime US3385740A (en)

Applications Claiming Priority (1)

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SE121/63A SE300117B (pt) 1963-01-05 1963-01-05

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US (1) US3385740A (pt)
CH (1) CH431102A (pt)
DK (1) DK104911C (pt)
FI (1) FI43084C (pt)
GB (1) GB994925A (pt)
SE (1) SE300117B (pt)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3920490A (en) * 1971-08-18 1975-11-18 Ford Motor Co Thermally processed steel
US3925064A (en) * 1973-05-31 1975-12-09 Kobe Steel Ltd High corrosion fatigue strength stainless steel
US4058417A (en) * 1975-02-24 1977-11-15 General Electric Company Turbine bucket alloy
US4406698A (en) * 1980-04-28 1983-09-27 Tokyo Shibaura Denki Kabushiki Kaisha Martensitic stainless cast steel having high cavitation erosion resistance
DE3628862A1 (de) * 1985-08-27 1987-03-12 Nisshin Steel Co Ltd Verfahren zur herstellung von stahl
WO1987002387A1 (en) * 1985-10-11 1987-04-23 Advanced Materials & Design Corporation Method of forming high -strength, corrosion-resistant steel
US20170197275A1 (en) * 2013-09-27 2017-07-13 National Institute Of Advanced Industrial Science And Technology Method for bonding stainless steel members and stainless steel

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1404907A (en) * 1913-06-25 1922-01-31 Strauss Benno Heat treatment of nickel-chrome steel
US2802755A (en) * 1953-01-21 1957-08-13 Armco Steel Corp Weld-electrode and product
US3061487A (en) * 1960-07-18 1962-10-30 North American Aviation Inc Method for improving the physical properties of semi-austenitic stainless steels

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1404907A (en) * 1913-06-25 1922-01-31 Strauss Benno Heat treatment of nickel-chrome steel
US2802755A (en) * 1953-01-21 1957-08-13 Armco Steel Corp Weld-electrode and product
US3061487A (en) * 1960-07-18 1962-10-30 North American Aviation Inc Method for improving the physical properties of semi-austenitic stainless steels

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3920490A (en) * 1971-08-18 1975-11-18 Ford Motor Co Thermally processed steel
US3925064A (en) * 1973-05-31 1975-12-09 Kobe Steel Ltd High corrosion fatigue strength stainless steel
US4058417A (en) * 1975-02-24 1977-11-15 General Electric Company Turbine bucket alloy
US4406698A (en) * 1980-04-28 1983-09-27 Tokyo Shibaura Denki Kabushiki Kaisha Martensitic stainless cast steel having high cavitation erosion resistance
DE3628862A1 (de) * 1985-08-27 1987-03-12 Nisshin Steel Co Ltd Verfahren zur herstellung von stahl
US4878955A (en) * 1985-08-27 1989-11-07 Nisshin Steel Company, Ltd. Process for preparing a high strength stainless steel having excellent workability and free form weld softening
AT394056B (de) * 1985-08-27 1992-01-27 Nisshin Steel Co Ltd Verfahren zur herstellung von stahl
WO1987002387A1 (en) * 1985-10-11 1987-04-23 Advanced Materials & Design Corporation Method of forming high -strength, corrosion-resistant steel
US4671827A (en) * 1985-10-11 1987-06-09 Advanced Materials And Design Corp. Method of forming high-strength, tough, corrosion-resistant steel
US20170197275A1 (en) * 2013-09-27 2017-07-13 National Institute Of Advanced Industrial Science And Technology Method for bonding stainless steel members and stainless steel
US10449629B2 (en) * 2013-09-27 2019-10-22 National Institute Of Advanced Industrial Science And Technology Method for bonding stainless steel members and stainless steel
US10549380B2 (en) * 2013-09-27 2020-02-04 National Institute Of Advanced Industrial Science And Technology Method for bonding stainless steel members and stainless steel

Also Published As

Publication number Publication date
FI43084C (fi) 1971-01-11
CH431102A (de) 1967-02-28
SE300117B (pt) 1968-04-08
DK104911C (da) 1966-07-18
FI43084B (pt) 1970-10-01
GB994925A (en) 1965-06-10

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