EP1918408A2 - Acier de décolletage inoxydable martensitique - Google Patents

Acier de décolletage inoxydable martensitique Download PDF

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Publication number
EP1918408A2
EP1918408A2 EP07019360A EP07019360A EP1918408A2 EP 1918408 A2 EP1918408 A2 EP 1918408A2 EP 07019360 A EP07019360 A EP 07019360A EP 07019360 A EP07019360 A EP 07019360A EP 1918408 A2 EP1918408 A2 EP 1918408A2
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content
stainless steel
less
machinability
bal
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EP1918408A3 (fr
EP1918408B1 (fr
Inventor
Koichi Ishikawa
Tetsuya Shimizu
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Daido Steel Co Ltd
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Daido Steel Co Ltd
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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
    • C22C38/60—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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • 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
    • C21D9/18—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for knives, scythes, scissors, or like hand cutting tools
    • 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
    • C22C38/04—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
    • C22C38/18—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
    • C22C38/22—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
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/18—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
    • C22C38/38—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
    • C22C38/18—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
    • C22C38/54—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
    • C22C38/18—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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

Definitions

  • the present invention relates to a martensitic free cutting stainless steel. More particularly, it relates to a martensitic free cutting stainless steel which does not contain Se which is one of free cutting elements.
  • S generally forms a sulfide type inclusion such as MnS or MnSe. Accordingly, stress concentrates to the inclusion upon forming chips, thereby to improve the machinability.
  • Pb is present in the form of a simple substance in the steel, and serves as a lubricant between a tool and chips. As a result, the machinability is improved.
  • JP-A-2002-38241 discloses a free cutting stainless steel which contains, by mass percent, C: 0.50% or less, Si: 0.05 to 2.00%, Mn: 0.05 to 1.00%, S: 0.05 to 0.50%, Se: 0.02 to 0.20%, Te: 0.01 to 0.10%, and Cr: 10.00 to 30.00%, in which component ratios of a Mn/S ratio: 2 or less, a Se/S ratio: 0.2 or more, and a Te/S ratio: 0.04 or more are satisfied, with the balance including Fe and inevitable impurities.
  • JP-A-8-134602 discloses a martensitic stainless steel which contains, by weight percent, C: 0.5% or less, Si: 0.05 to 2.00%, Mn: 0.10 to 3.00%, P: 0.20% or less, Ni: 2.00% or less, Cr: 12.0 to 25.0%, Mo: 0.10 to 3.00%, S: 0.40 to 0.50%, Al: 0.10% or less, N: 0.10% or less, 0.60 to 200ppm, Pb: 0.03 to 0.30%, and Te: 0.02 to 0.15%, with the balance including Fe and inevitable impurities, and has a Mn/S ratio of 4.5 to 6.5, and a Te/S ratio of less than 0.07.
  • the machinability is improved by the stress concentration to the sulfide.
  • the size or form of the formed sulfide directly affects the machinability.
  • the formed sulfide is too large, it operates as the breakage starting point, resulting in the deterioration of the strength of the stainless steel.
  • the formed sulfide extends extremely in one direction, the anisotropy occurs in the stainless steel, resulting in the deterioration of the toughness. Also from these viewpoints, it is important to control the size and the form of the sulfide.
  • the free cutting stainless steel of JP-A-2002-38241 has a Mn/S ratio of as small as 2.0 or less, and hence it is inferior in hot workability. This tends to cause an increase in manufacturing cost as well.
  • the inclusions increase in size. Therefore, the sulfides extend long in the longitudinal direction of the steel material. Accordingly, anisotropy occurs in the toughness, the fatigue strength, or the like, and thus the characteristics are largely degraded.
  • selenium ions detrimental to a human body are generated due to the corrosion of selenides.
  • the free cutting stainless steel of JP-A-8-134602 has a largely increased S content, and whereby it has been improved in machinability due to the increase in size of sulfides.
  • sulfides are excessively formed, and in addition, the inclusions increase in size. Therefore, the sulfides extend long in the longitudinal direction of the steel material. Accordingly, anisotropy occurs in the toughness, the fatigue strength, or the like, and thus the characteristics are largely degraded. Further, it also causes the deterioration of the corrosion resistance, the hot workability, or the cold workability.
  • the present invention relates to the following (1) to (6).
  • a martensitic free cutting stainless steel in accordance with the present invention satisfies the foregoing component composition, and S, Mn, Te, and O satisfy the foregoing respective formulae, whereby the good balance is achieved. Accordingly, in the steel, a sulfide having a specific size and form is present in a specific area ratio. Therefore, the martensitic free cutting stainless steel in accordance with the invention is excellent in machinability, hot workability, cold workability, and toughness in comparison with the conventional martensitic free cutting stainless steels.
  • the stainless steel of the invention contains the following elements, with the reminder being substantially Fe and inevitable impurities.
  • the types of the addition elements, the component ratio, the reason for limitation, and the like are as follows.
  • the unit of the component ratio is weight percent.
  • all the percentages defined by weight are the same as those defined by mass, respectively.
  • the stainless steel of the present invention may further arbitrarily contain one or two or more elements selected from the following elements in addition to the foregoing essential elements.
  • the component ratio, the reason for limitation of each element, and the like are as follows.
  • Cu is an element which is effective for the improvement of the corrosion resistance, especially the corrosion resistance in a reducing acid environment.
  • the lower limit of the content of Cu is set at 0.01% or more.
  • the lower limit of the content of Cu is preferably 0.05% or more, and more preferably 0.10% or more.
  • the upper limit of the content of Cu is set at 2.0% or less.
  • the upper limit of the content of Cu is preferably 1.0% or less, and more preferably 0.8% or less.
  • Ni is an element which is effective for enhancing the corrosion resistance imparted by Cr.
  • the lower limit of the content ofNi is set at 0.01% or more.
  • the lower limit of the content of Ni is preferably 0.05% or more, and more preferably 0.10% or more.
  • the upper limit of the content ofNi is set at 2.0% or less.
  • the upper limit of the content ofNi is preferably 1.0% or less, and more preferably 0.5% or less.
  • Mo is an element which is capable of improving the corrosion resistance and the strength.
  • the lower limit of the content of Mo is set at 0.01% or more.
  • the lower limit of the content of Mo is preferably 0.05% or more, and more preferably 0.10% or more.
  • the upper limit of the content of Mo is set at 1.0% or less.
  • the upper limit of the content of Mo is preferably 0.60% or less, and more preferably 0.50% or less.
  • Bi is an element which is capable of further improving the machinability. Accordingly, it may be optionally added.
  • the lower limit of the content of Bi is set at 0.01% or more.
  • the lower limit of the content of Bi is preferably 0.05% or more.
  • the upper limit of the content ofBi is set at 0.30% or less.
  • the upper limit of the content ofBi is preferably 0.20% or less.
  • Ca, Mg, and REM are elements which are effective for the improvement of the hot workability. Accordingly, they may be optionally added. In order to obtain the effect, all of the content of Ca, the content of Mg, and the content of REM are set at 0.0001% or more, respectively.
  • the content of Ca is set at 0.05% or less, and preferably 0.01% or less.
  • the content ofMg is set at 0.02% or less, and preferably 0.01% or less.
  • the content of REM is set at 0.02% or less.
  • W has an effect of further improving the corrosion resistance and the strength. Accordingly, it may be optionally added.
  • the content of W is set at 0.01% or more.
  • the lower limit of the content ofW is preferably 0.05% or more, and more preferably 0.10% or more.
  • the content of W is set at 2.0% or less.
  • the upper limit of the content of W is preferably set at 1.0% or less.
  • Nb, Ta, and V each form a carbonitride to thereby refine the grain size, and thus have an effect of enhancing the toughness.
  • all of the content of Nb, the content of Ta, and the content of V are set at 0.01% or more, respectively.
  • All of the content ofNb, the content of Ta, and the content of V are preferably 0.05% or more, and more preferably 0.10% or more, respectively.
  • all of the content ofNb, the content of Ta, and the content of V are set at 0.50% or less, respectively. All of the content ofNb, the content of Ta, and the content of V are preferably 0.40% or less, respectively.
  • the stainless steel of the invention satisfies the respective formulae of 3.0 ⁇ [Mn]/[S] ⁇ 15.0, 0.10 ⁇ [Te]/[S], and 10 ⁇ [S]/[O] ⁇ 40.
  • each parenthesis [ ] in the formulae indicates the weight percent of each element.
  • the lower limit of the value of [Mn]/[S] is set at 3.0 or more.
  • the lower limit of the value of [Mn]/[S] is preferably 4.0 or more.
  • the upper limit of the value of [Mn]/[S] is set at 15.0 or less.
  • the upper limit of the value of [Mn]/[S] is preferably 10.0 or less.
  • the upper limit of the value of [Te]/[S] is not particularly limited. However, it is preferably 0.50 or less from the viewpoint of the hot workability.
  • the lower limit of the value of [S]/[O] is set at 10 or more.
  • the lower limit of the value of [S]/[O] is preferably 15 or more.
  • the upper limit of the value of [S]/[O] is preferably 30 or less.
  • sulfides having a circle equivalent diameter of 2.0 ⁇ m or more and an aspect ratio of 10 or less are present in a total amount of 0.50% or more by area ratio. As a result, an excellent machinability can be exerted.
  • the upper limit of the above-mentioned area ratio is 10.0% or less. When it exceeds the value, anisotropy occurs in the toughness, the fatigue strength, or the like. Like this, it is observed that the characteristics tend to be largely degraded.
  • the above-mentioned area ratio can be determined in the following manner. Namely, for the mirror-polished surface of the stainless steel of the invention, typical microphotographs are taken at a 200-fold magnification in 50 visual fields. Then, color extraction of the sulfide (inclusion) is carried out. Thus, the circle equivalent diameter and the aspect ratio of each sulfide are measured by image processing. Out of these, the total area ratio of the sulfides having a circle equivalent diameter of 2 ⁇ m or more and an aspect ratio of 10 or less can be determined.
  • the aspect ratio indicates the value of the longer diameter of the sulfide/shorter diameter of the sulfide.
  • the heating temperature during the hot forging or hot rolling for example, a temperature range of 950 to 1250°C can be specifically exemplified.
  • Annealing can be carried out in the following manner. For example, heating is carried out at 750 to 900°C for 3 to 5 hours. Then, furnace cooling is carried out to around 600°C at a rate of 10 to 20°C/hour. Thereafter, air cooling is carried out.
  • pickling or polishing for removal of the surface oxide layer may be optionally carried out, and cold rolling may be optionally carried out.
  • the application of the stainless steel of the invention as described above is not particularly limited.
  • the stainless steel of the invention can be preferably used for members required to be subjected to cold cutting processing (such as finishing processing), and to have a corrosion resistance, a high strength, and the like, such as a motor shaft, a pump shaft, a valve component, a screw, a bolt, and a nut.
  • respective ingots were heated to 1000 to 1200°C, and processed into round bar steels with a diameter of 60 mm and with a diameter of 20 mm, and square bar steels with a width of 60 mm and a height of 30 mm by hot forging.
  • the stainless steels in accordance with Comparative Example 1 and Comparative Example 2 are SUS410 and SUS416 specified according to JIS, respectively.
  • the stainless steels in accordance with Comparative Example 9 and Comparative Example 10 are SUS420J2 and SUS420F specified according to JIS, respectively.
  • the stainless steels in accordance Comparative Examples 1 to 8 are for the comparison with the stainless steels in accordance with Examples 1 to 15, and 31 to 35.
  • the stainless steels in accordance Comparative Examples 9 to 16 are for the comparison with the stainless steels in accordance with Examples 16 to 30, and 36 to 40.
  • the measurement method was as follows. Samples with a length of 10 mm per side were collected from the 20-mm round bar steels, and each sample was embedded in a resin so that the longitudinal direction is the measurement surface. Then, for the mirror-polished surface of each stainless steel, typical microphotographs were taken at a 200-fold magnification in 50 visual fields by means of an optical microscope.
  • Comparative Example 9 is SUS420J2.
  • Comparative Example 10 is SUS420F.
  • [X] denotes the content (wt%) of element X.
  • [X]/[Y] denotes the ratio (wt%) of elements X to Y Table 5 [Mn]/[S] [Te]/[S] [S]/[O] Area ratio of sulfide (%) Ex.
  • [X] denotes the content (wt%) of element X.
  • [X]/[Y] denotes the ratio (wt%) of elements X to Y Table 6 [Mn]/[S] [Te]/[S] [S]/[O] Area ratio of sulfide (%) Ex.
  • [X] denotes the content (wt%) of element X.
  • [X]/[Y] denotes the ratio (wt%) of elements X to Y
  • the stainless steel in accordance with Comparative Example 1 is SUS410 specified according to JIS, and contains a very small amount of S which is one of free cutting elements, and is not a so-called free cutting stainless steel. Accordingly, it contains almost no sulfides, and is very excellent in corrosion resistance, and has almost no anisotropy, and is also excellent in toughness. Further, it is also excellent in hot workability and cold workability. However, it is very inferior in machinability.
  • the stainless steel in accordance with Comparative Example 2 is SUS416 specified according to JIS.
  • SUS410 contains S which is one of free cutting elements, added therein (it also contains no Pb nor Te which is another free cutting element).
  • the machinability is improved by the presence of sulfides which are inclusions.
  • this is due to a mere increase in amount of S to be added to SUS410. Therefore, anisotropy occurs, so that the toughnesses in the L direction and in the T direction are badly balanced. This is presumably due to the fact that there occurred a sulfide which extended in the form of a string in the longitudinal direction. Further, the cold workability is also deteriorated as compared with SUS410.
  • the stainless steel in accordance with Comparative Example 9 is SUS420J2 specified according to JIS. This is also not a free cutting stainless steel as with the SUS410. Accordingly, it contains almost no sulfides, and is very excellent in corrosion resistance, and has almost no anisotropy, and is also excellent in toughness. Further, it is also excellent in hot workability and cold workability. However, it is very inferior in machinability.
  • the stainless steel in accordance with Comparative Example 10 is SUS420F specified according to JIS. As compared with SUS420J2, it contains S which is one of free cutting elements, added therein (it contains no Pb nor Te which is another free cutting element). Accordingly, the machinability is improved by the presence of sulfides which are inclusions. However, this is due to a mere increase in amount of S to be added to SUS420J2. Therefore, anisotropy occurs, so that the toughnesses in the L direction and in the T direction are badly balanced. This is presumably due to the fact that there occurred a sulfide which extended in the form of a string in the longitudinal direction. Further, the cold workability is also deteriorated as compared with SUS420J2.
  • the stainless steels in accordance with Comparative examples 3 and 11 each contain O in a larger proportion than the range specified in this application. Accordingly, as compared with the stainless steels in accordance with Examples 1 to 15, and 31 to 35, and the stainless steels in accordance with Examples 16 to 30, and 36 to 40, the machinability is lower. This is presumably due to the fact that excessive addition of O resulted in the formation of oxides which are not effective for the improvement of the machinability.
  • the stainless steels in accordance with Comparative Examples 4 and 12 each contain S which is one of free cutting elements in a smaller proportion than the range specified in this application. Accordingly, the total area ratio of a specific sulfide is also lower than the range specified in this application. As compared with the stainless steels in accordance with Examples 1 to 15, and 31 to 35, and the stainless steels in accordance with Examples 16 to 30, and 36 to 40, the effect of improving the machinability cannot be sufficiently obtained.
  • the stainless steels in accordance with Comparative Examples 5 and 13 each contain Te which is one of free cutting elements in a smaller proportion than the range specified in this application. Accordingly, as compared with the stainless steels in accordance with Examples 1 to 15, and 31 to 35, and the stainless steels in accordance with Examples 16 to 30, and 36 to 40, the effect of improving the machinability cannot be sufficiently obtained. Further, it is indicated that the cold workability is deteriorated, and that the toughness is also deteriorated due to the anisotropy.
  • the stainless steels in accordance with Comparative Examples 6 and 14 each contain O in a smaller proportion than the range specified in this application. Accordingly, as compared with the stainless steels in accordance with Example 1 to 15, and 31 to 35, and the stainless steels in accordance with Examples 16 to 30, and 36 to 40, the machinability is deteriorated. This is presumably due to the fact that too small amount of O inhibited the sufficient formation of sulfides with such a size as to improve the machinability.
  • the stainless steels in accordance with Comparative Examples 7 and 15 each contain S in an extremely larger proportion than the range specified in this application. Accordingly, the machinability is comparable to that of each stainless steel in accordance with Examples 1 to 15, and 31 to 35, and that of each stainless steel in accordance with Examples 16 to 30, and 36 to 40. However, the anisotropy has occurred, resulting in a deterioration of the toughness. Further, the cold workability is also extremely deteriorated.
  • the stainless steels in accordance with Comparative Examples 8 and 16 each has, especially, an extremely smaller value of [Mn]/[S] than the range specified in this application. Accordingly, the machinability is deteriorated, and in addition, the hot workability is also inferior as compared with each stainless steel in accordance with Examples 1 to 15, and 31 to 35, and each stainless steel in accordance with Examples 16 to 30, and 36 to 40.
  • the stainless steels in accordance with Examples 1 to 40 satisfy the component composition specified in this invention.
  • S, Mn, Te, and O each satisfy the above-mentioned respective formulae.
  • a specific sulfide is present in a specific area ratio. Accordingly, the machinability, the hot workability, the cold workability, and the toughness were excellent.

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EP07019360.2A 2006-10-03 2007-10-02 Acier de décolletage inoxydable martensitique Expired - Fee Related EP1918408B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006271360 2006-10-03
JP2007174797A JP5135918B2 (ja) 2006-10-03 2007-07-03 マルテンサイト系快削ステンレス鋼

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EP1918408A2 true EP1918408A2 (fr) 2008-05-07
EP1918408A3 EP1918408A3 (fr) 2010-10-27
EP1918408B1 EP1918408B1 (fr) 2014-11-26

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US (1) US20080089804A1 (fr)
EP (1) EP1918408B1 (fr)
JP (1) JP5135918B2 (fr)
CN (1) CN101158011B (fr)

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CN103627964A (zh) * 2013-11-11 2014-03-12 马鞍山市恒毅机械制造有限公司 一种高原始硬度破碎机锤用合金钢材料及其制备方法
CN103938105A (zh) * 2014-04-03 2014-07-23 黄维明 菜刀用合金钢
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CN104313506A (zh) * 2014-10-20 2015-01-28 熊荣鑫 一种无火花铁合金
RU2586949C1 (ru) * 2015-06-08 2016-06-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Южно-Уральский государственный университет" (национальный исследовательский университет) (ФГБОУ ВПО "ЮУрГУ" (НИУ)) Мартенситно-ферритная коррозионно-стойкая хромоникелевая сталь с улучшенной обрабатываемостью резанием
CN105200346A (zh) * 2015-09-22 2015-12-30 江苏新核合金科技有限公司 一种蒸发器拉杆和拉杆螺母用12Cr13棒材
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JP6600262B2 (ja) * 2016-02-19 2019-10-30 株式会社ジェイテクト 転がり摺動部材とこれを利用した転がり軸受、及び転がり摺動部材の製造方法
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CN113966405A (zh) * 2019-06-05 2022-01-21 山特维克材料技术公司 马氏体不锈钢合金
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CN110819913B (zh) * 2019-11-27 2020-12-04 攀钢集团江油长城特殊钢有限公司 一种硫系易切削不锈钢及其制备方法
CN111118406B (zh) * 2020-01-15 2020-09-01 南京福贝尔五金制品有限公司 一种耐海洋大气腐蚀高强度螺栓的制造方法
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CN112760576B (zh) * 2020-12-07 2022-08-05 上海大学 含碲的Y1Cr13易切削不锈钢及其制造方法
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CN115466910B (zh) * 2022-06-15 2023-05-05 福建青拓特钢技术研究有限公司 一种含碲易切削不锈钢套标及其制备方法
CN116288073B (zh) * 2023-05-23 2023-07-21 北京科技大学 高耐蚀含碲不锈钢

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CN101158011A (zh) 2008-04-09
JP5135918B2 (ja) 2013-02-06

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