US3251682A - Low-alloy tough steel - Google Patents
Low-alloy tough steel Download PDFInfo
- Publication number
- US3251682A US3251682A US233144A US23314462A US3251682A US 3251682 A US3251682 A US 3251682A US 233144 A US233144 A US 233144A US 23314462 A US23314462 A US 23314462A US 3251682 A US3251682 A US 3251682A
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- United States
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- steel
- low
- alloy
- tough
- tough steel
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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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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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)
Description
United States Patent Ofiice 3,251,682 Patented May .17, 1966 3,251,682 LOW-ALLOY TOUGH STEEL Kamekichi Wada, Yawata, Fukuoka Prefecture, Japan,
assignor to Yawata Iron & Steel Co., Ltd., Tokyo,
Japan, a corporation of Japan No Drawing. Filed Oct. 25, 1962, Ser. No. 233,144
Claims priority, applicatioriliipan, Nov. 29, 1961, 1 Claim. (Cl. 75-124) This invention'relates to low-alloy tough steels or more particularly to a tough steel containing no nickel and vanadium.
When a tough steel, having the high strength and toughness necessary for construction of machines, is quenched, it will uniformly harden and, when it is properly tempered, its toughness will be increased.
The kind of steel which is generally used as a tough steel it a steel having a carbon conent of about 0.25 to 0.50% and in addition, having a proper amount of such elements as silicon, mananese, chromium, nickel, molybdenum and vanadium. It is used as quenched and then tempered at 550 to 650 C. so as to have the sorbite structure.
Further, so-called T-l steel which has the toughness, ductility and weldability of a low-carbon steel is known and extensively used as a tough steel though it is not used in a low-temperature tempered state.
However, the steel, mentioned above, has costly nickel and vanadium added thereto in order to obtain the desired mechanical properties and therefore is expensive.
Furthermore, this steel has weak resistance against stress-corrosion in an atmosphere containing hydrosulphide or ammonia.
An object of the present invention is to provide an inexpensive low-alloy tough steel containing no costly nickel and vanadium as alloying elements but having the same or better mechanical properties, anticorrosiveness, stress-corrosion resistance and weldability as the said type of known tough steel.
The low-alloy tough steel of the present invention is composed of less than about 0.25% carbon, less than about 0.5% Silicon, about 0.50 to 1.50% manganese, about 0.80 to 2.0% chromium, about 0.2 to 0.6% molydenum, about 0.01 to 0.15% aluminum, 0.005 to 0.0003% boron, less than about 0.05% titanium with the remainder being iron and unavoidable impurities.
The low-alloy tough steel of the present invention is used as quenched and tempered or as normalized 'or normalized and tempered.
The ranges of the contents of the respective alloying elements in the present invention are limited in such a sence as is mentioned below.
The carbon content should be less than .25 in order to increase the toughness of the steel at low temperatures and to improve the weldability. At least 0.5 manganese must be present in refining the steel in order to increase the low-temperature toughness. If there is more than 1.50% manganese, the weldability of the steel is reduced and the cost of the steel is high. Chromium increases the hardenability, strength and low-temperature toughness, improves the anticorrosiveness in the air and in an atmosphere of hydrosulphide or mamonia, prevents thickness reduction of the steel due to corrosion satisfying one of the requirements for lightening the weight of structures by the use of such kind of steel. However, as in the case of manganese, when is more than 2.00% chromium is present, the weldability of the steel is reduced and the production cost becomes high. Therefore, the amount of chromium should be about 0.80 to 2.00%. About 0.2 to 0.6% molybdenum is added for the purpose of increasing the hardenability of the steel, preventing the steel from becoming brittle when tempered, increasing the resistance to tempering, expanding the cooling velocity range for the production of bainite by the mutual action with boron and giving a stable strength.
Boron increases the hardenability without reducing the weldability, makes the addition of nickel and other elements unnecessary, serves to reduce the production cost and stabilizes the strength by the mutual action with molybdenum. However, the addition of more than 0.005% boron will reduce the hot-workability. The addition of less than 0.0003% will have no effect.
Titanium, combining with nitrogen in the steel, prevents the efiective amount of boron from being reduced by free nitrogen and increases the resistance to tempering. But, when a large amount of titanium is added, the toughness will be reduced. Therefore, the titanium content should be less than 0.05%. However, when the thickness of the plate is less than 25 mm., there is no need to add titanium because the hardenability will be sufiiciently high that the titanium will have no efiect on the hardening.
In order to secure an elfective amount of titanium by deoxidation and to refine the austenite grain size, about 0.01 to 0.15% aluminum is added. So much silicon is added as is required for making the steel.
Table 1 shows specific examples of chemical compositions of low-alloy tough steels according to the present invention. Table 2 shows the chemical properties of the said toughsteels.
TABLE 1.EXAMPLES OF CHEMICAL COMPOSITIONS OF LOW-ALLOY TOUGH STEELS ACCORDING TO THE PRESENT INVENTION Sample signs C Si Mn Cr Mo B Ti Al TABLE 2.E I( AMPLES OF MECHANICAL PROPERTIES OF HE ALLOY STEELS IN TABLE I As evident from the above tables, in the low-alloy tough steels of the present invention, the tempering temperature can be elevated, thereby preventing lowering the strength after annealing to remove stresses and improving the toughness.
What I claim is: References Cited by the Examines A low-alloy tough steel composed of less than about NITED STATES ATENTS 0.25% carbon, less than about 0.5% silicon, about 0.50 U to 1.50% manganese, about 0.80 to 2.0% chromium, 236L908 11/1958 Mlckelson et about 0.2 to 0.6% molybdenum, about 0.01 to 0.15% 5 aluminum, 0.005 to 0.0003%. boron, about 0.017 to DAVID RECK Pr'mary Examme 0.05% titanium and the remainder being essentially iron. P. WEINSTEIN, Assistant Examiner.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4318161 | 1961-11-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3251682A true US3251682A (en) | 1966-05-17 |
Family
ID=12656706
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US233144A Expired - Lifetime US3251682A (en) | 1961-11-29 | 1962-10-25 | Low-alloy tough steel |
Country Status (3)
Country | Link |
---|---|
US (1) | US3251682A (en) |
DE (1) | DE1215378B (en) |
GB (1) | GB1020913A (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3291655A (en) * | 1964-06-17 | 1966-12-13 | Gen Electric | Alloys |
US3348981A (en) * | 1964-02-21 | 1967-10-24 | Yawata Iron & Steel Co | High tension low temperature tough steel |
US3418110A (en) * | 1964-01-22 | 1968-12-24 | Goda Susumu | Hardenable steel material containing aluminum |
US3539404A (en) * | 1967-05-15 | 1970-11-10 | Youngstown Sheet And Tube Co | Method of making a low alloy steel |
US3708280A (en) * | 1969-11-19 | 1973-01-02 | Nippon Kokan Kk | High temperature low alloy steel |
US3915697A (en) * | 1975-01-31 | 1975-10-28 | Centro Speriment Metallurg | Bainitic steel resistant to hydrogen embrittlement |
US4019930A (en) * | 1975-11-19 | 1977-04-26 | Bethlehem Steel Corporation | Deep hardening machinable aluminum killed high sulfur tool steel |
US4052230A (en) * | 1975-11-19 | 1977-10-04 | Bethlehem Steel Corporation | Deep hardening machinable aluminum killed high sulfur tool steel |
FR2408659A1 (en) * | 1977-11-14 | 1979-06-08 | Benteler Werke Ag | METHOD OF MANUFACTURING A TUBULAR PROFILE IN STEEL INTENDED FOR REINFORCING DOORS FOR MOTOR VEHICLES |
US4251711A (en) * | 1978-02-25 | 1981-02-17 | Nippon Steel Corporation | Low-hydrogen coated electrode |
US4375377A (en) * | 1981-02-25 | 1983-03-01 | Sumitomo Metal Industries, Limited | Steels which are useful in fabricating pressure vessels |
US4529454A (en) * | 1981-02-27 | 1985-07-16 | Hitachi Ltd | Low C-Cr-Mo steel used under wet steam |
US4537644A (en) * | 1981-09-28 | 1985-08-27 | Nippon Steel Corporation | High-tension high-toughness steel having excellent resistance to delayed fracture and method for producing the same |
DE102007018838A1 (en) * | 2007-04-20 | 2008-10-30 | Benteler Automobiltechnik Gmbh | Use of a steel alloy |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8320622D0 (en) * | 1983-07-30 | 1983-09-01 | British Steel Corp | Alloy steels |
JP2684109B2 (en) * | 1990-03-13 | 1997-12-03 | 株式会社 日本製鋼所 | Overlay stainless clad steel with excellent peel resistance made of low alloy steel for high temperature and high pressure |
KR940002139B1 (en) * | 1991-11-30 | 1994-03-18 | 삼성중공업 주식회사 | Carburized boron steels for gears |
FR2726287B1 (en) * | 1994-10-31 | 1997-01-03 | Creusot Loire | LOW ALLOY STEEL FOR THE MANUFACTURE OF MOLDS FOR PLASTICS OR FOR RUBBER |
FR2748037B1 (en) * | 1996-04-29 | 1998-05-22 | Creusot Loire | WELDABLE REPAIRABLE STEEL FOR THE MANUFACTURE OF MOLDS FOR PLASTIC MATERIALS |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2861908A (en) * | 1955-11-30 | 1958-11-25 | American Steel Foundries | Alloy steel and method of making |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2513395A (en) * | 1946-07-18 | 1950-07-04 | United Steel Companies Ltd | Boron-treated molybdenum steel |
-
1962
- 1962-10-23 GB GB40087/62A patent/GB1020913A/en not_active Expired
- 1962-10-25 US US233144A patent/US3251682A/en not_active Expired - Lifetime
- 1962-11-16 DE DEY655A patent/DE1215378B/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2861908A (en) * | 1955-11-30 | 1958-11-25 | American Steel Foundries | Alloy steel and method of making |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3418110A (en) * | 1964-01-22 | 1968-12-24 | Goda Susumu | Hardenable steel material containing aluminum |
US3348981A (en) * | 1964-02-21 | 1967-10-24 | Yawata Iron & Steel Co | High tension low temperature tough steel |
US3291655A (en) * | 1964-06-17 | 1966-12-13 | Gen Electric | Alloys |
US3539404A (en) * | 1967-05-15 | 1970-11-10 | Youngstown Sheet And Tube Co | Method of making a low alloy steel |
US3708280A (en) * | 1969-11-19 | 1973-01-02 | Nippon Kokan Kk | High temperature low alloy steel |
US3915697A (en) * | 1975-01-31 | 1975-10-28 | Centro Speriment Metallurg | Bainitic steel resistant to hydrogen embrittlement |
US4019930A (en) * | 1975-11-19 | 1977-04-26 | Bethlehem Steel Corporation | Deep hardening machinable aluminum killed high sulfur tool steel |
US4052230A (en) * | 1975-11-19 | 1977-10-04 | Bethlehem Steel Corporation | Deep hardening machinable aluminum killed high sulfur tool steel |
FR2408659A1 (en) * | 1977-11-14 | 1979-06-08 | Benteler Werke Ag | METHOD OF MANUFACTURING A TUBULAR PROFILE IN STEEL INTENDED FOR REINFORCING DOORS FOR MOTOR VEHICLES |
US4251711A (en) * | 1978-02-25 | 1981-02-17 | Nippon Steel Corporation | Low-hydrogen coated electrode |
US4375377A (en) * | 1981-02-25 | 1983-03-01 | Sumitomo Metal Industries, Limited | Steels which are useful in fabricating pressure vessels |
US4529454A (en) * | 1981-02-27 | 1985-07-16 | Hitachi Ltd | Low C-Cr-Mo steel used under wet steam |
USRE33006E (en) * | 1981-02-27 | 1989-08-01 | Hitachi, Ltd. | Feed-water heater comprising low C-Cr-Mo steel components used under wet steam |
US4537644A (en) * | 1981-09-28 | 1985-08-27 | Nippon Steel Corporation | High-tension high-toughness steel having excellent resistance to delayed fracture and method for producing the same |
DE102007018838A1 (en) * | 2007-04-20 | 2008-10-30 | Benteler Automobiltechnik Gmbh | Use of a steel alloy |
Also Published As
Publication number | Publication date |
---|---|
DE1215378B (en) | 1966-04-28 |
GB1020913A (en) | 1966-02-23 |
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