US3647425A - Free cutting steel containing small amounts of aluminum and calcium - Google Patents

Free cutting steel containing small amounts of aluminum and calcium Download PDF

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Publication number
US3647425A
US3647425A US26341A US3647425DA US3647425A US 3647425 A US3647425 A US 3647425A US 26341 A US26341 A US 26341A US 3647425D A US3647425D A US 3647425DA US 3647425 A US3647425 A US 3647425A
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United States
Prior art keywords
steel
free cutting
cutting steel
content
calcium
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Expired - Lifetime
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US26341A
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English (en)
Inventor
Yoshio Miyashita
Katuhiko Nishikawa
Toshio Sata
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JFE Engineering Corp
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Nippon Kokan 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

Definitions

  • Ca-deoxidation steel is developed to improve the above defects.
  • the making cost is cheaper than that the said steels and the range of said machining speed is considerably broad.
  • the free cutting property has considerable dispersion and the mechanical properties such impact value and the like become worse.
  • This reason lies in the following matters; generally, some coated layer should be formed on machining face by tool in order to improve free cutting property.
  • SiO which is higher, M 0 which is lower, as composition of oxide system inclusion.
  • Sol.Al in steel ought to be made lower. Consequently, this method brings about increasing inclusions in steel and inner flaws base on said inclusions and deteriorating mechanical properties as impace value and the like, because of austenite grain size made coarse.
  • This invention is developed to solve the above-mentioned troubles the features of this invention consist in composition with which Ca, S, and Sol.Al are added to steel simultaneously. That is, this invention steel consists of 0.08 to 0.60% C, 0.15 to 0.60% Si, 0.30 to 2.00% Mn, 0.002 to 0.02% Ca, 0.030 to 0. l 5% S and 0.005 to 0.05% Sol.Al.
  • An object of this invention is to provide a free cutting steel that abrasion amount of used tool is possible to be caused to grow less easily and stably.
  • Another object of this invention is to provide a free cutting steel that abrasion amount of tool rake face and also that of tool relief face is possible to be caused to grow little less easily and stably. 7
  • Further object of this invention is to provide a free cutting steel having excellent mechanical properties, especially impact property.
  • the FIGURE illustrates a relation between S content and depth of rake face abrasion.
  • composition of this invention steel is decided by the following reasons:
  • Si and Mn have effects making yield strength and tensile strength of steel increase with low cost. Therefore, a good deal of Si and Mn are added to steel, However, both more than 0.60% Si and more than 2.00% Mn harms toughness of steel. Also, less than 0.15% Si and less than 0.30% Mn has no effect, which is above-mentioned.
  • Ca content of from 0.002 to 0.02% is effective against said abrasion of tool, because CaO is included in oxide system inclusions and CaS is included in sulfide system inclusion makes machinability of steel worse and less than 0.002% Ca has no effects as mentioned above.
  • S content of 0.030 to 0.15% is effective in forming CaS- MnS system sulfide, which is effective against said abrasion of tool. More than 0. l 5% S makes said machinability and mechanical properties of steel worse and has a tendency to produce cracks in quenching stage. Less than 0.030% S has no effects as mentioned above.
  • SoLAl content of 0.005 to 0.05% is provided for deoxidizing and adjusting grain size of steel. More than 0.05% Sol.Al hanns cleanliness of steel and less than 0.005% Sol.Al has no effects as mentioned above.
  • Table II shows results of the above-mentioned steels machined by the following conditions. That is;
  • Tempering temperature and time 650 C. X 1 hr.
  • oxide system inclusions in common Ca free cutting steel having a small amount of sulfur consist of SiO:, CaO and A1 There is, of course, no being of sulfide phase among the same inclusions in the range of low SoLAl content.
  • sulfide phase in this invention steel which consists of CaS and MnS, exists as said oxide phase is wrapped up. It is confirmed that these sulfides, which coexist with said oxides, are effective against harm of said oxides.
  • the subject of the above sulfide is CaS and the effect of CaS is kept up even though A1 0 content in oxide phase increases. It is, however, a matter of course that there is the most suitable range in said content of CaS.
  • Sol.Al content of this invention does not need to be limited to low range like that of common Ca free cutting steel and displays excellent free cutting property. On the contrary, it shows good mechanical properties and is possible to decrease said abrasion amount of tool and to decrease that of 7 tool relief face with case.
  • a free cutting steel consisting of 0.08 to 0.60% C; 0.15 to 0.60% Si; 0.30 to 2.00% Mn; 0.002 to 0.02% (Ia; 0.03 to 0.15% S; 0.005 to 0.05% SoLAl, unavoidable impurities and the balance being Fe.

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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)
  • Treatment Of Steel In Its Molten State (AREA)
US26341A 1969-04-07 1970-04-07 Free cutting steel containing small amounts of aluminum and calcium Expired - Lifetime US3647425A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44026129A JPS516088B1 (bg) 1969-04-07 1969-04-07

Publications (1)

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US3647425A true US3647425A (en) 1972-03-07

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US26341A Expired - Lifetime US3647425A (en) 1969-04-07 1970-04-07 Free cutting steel containing small amounts of aluminum and calcium

Country Status (8)

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US (1) US3647425A (bg)
JP (1) JPS516088B1 (bg)
AT (1) AT318683B (bg)
CA (1) CA920843A (bg)
CH (1) CH516000A (bg)
DE (1) DE2016561B2 (bg)
NL (1) NL7004992A (bg)
SE (1) SE369736B (bg)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050058567A1 (en) * 2000-02-10 2005-03-17 Sanyo Special Steel Co., Ltd. Lead-free steel for machine structural use with excellent machinability low strength anisotropy
EP1688512A1 (en) * 2000-02-10 2006-08-09 Sanyo Special Steel Co., Ltd. Lead-free steel for machine structural use with excellent machinability and low strenght anisotropy

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5115487B1 (bg) * 1971-08-04 1976-05-17
FR2287521A1 (fr) * 1974-10-11 1976-05-07 Ugine Aciers Acier de decolletage

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US422403A (en) * 1890-03-04 Robert a
US1962599A (en) * 1932-06-11 1934-06-12 Chas W Guttzeit Corrosion resisting alloys
US2258604A (en) * 1940-05-18 1941-10-14 Int Nickel Co Cast steel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US422403A (en) * 1890-03-04 Robert a
US1962599A (en) * 1932-06-11 1934-06-12 Chas W Guttzeit Corrosion resisting alloys
US2258604A (en) * 1940-05-18 1941-10-14 Int Nickel Co Cast steel

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050058567A1 (en) * 2000-02-10 2005-03-17 Sanyo Special Steel Co., Ltd. Lead-free steel for machine structural use with excellent machinability low strength anisotropy
EP1688512A1 (en) * 2000-02-10 2006-08-09 Sanyo Special Steel Co., Ltd. Lead-free steel for machine structural use with excellent machinability and low strenght anisotropy
US7195736B1 (en) 2000-02-10 2007-03-27 Sanyo Special Steel Co., Ltd. Lead-free steel for machine structural use with excellent machinability and low strength anisotropy
US7445680B2 (en) 2000-02-10 2008-11-04 Sanyo Special Steel Co., Ltd. Lead-free steel for machine structural use with excellent machinability and low strength anisotropy

Also Published As

Publication number Publication date
SE369736B (bg) 1974-09-16
CA920843A (en) 1973-02-13
NL7004992A (bg) 1970-10-09
DE2016561B2 (de) 1971-01-07
AT318683B (de) 1974-10-25
JPS516088B1 (bg) 1976-02-25
DE2016561A1 (bg) 1971-01-07
CH516000A (fr) 1971-11-30

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