US3661537A - Welded pipe structure of high strength low alloy steels - Google Patents
Welded pipe structure of high strength low alloy steels Download PDFInfo
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- US3661537A US3661537A US842285A US3661537DA US3661537A US 3661537 A US3661537 A US 3661537A US 842285 A US842285 A US 842285A US 3661537D A US3661537D A US 3661537DA US 3661537 A US3661537 A US 3661537A
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- pipe structure
- welded pipe
- control agent
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- 229910000831 Steel Inorganic materials 0.000 title abstract description 26
- 239000010959 steel Substances 0.000 title abstract description 26
- 229910045601 alloy Inorganic materials 0.000 title abstract description 3
- 239000000956 alloy Substances 0.000 title abstract description 3
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 9
- 229910001122 Mischmetal Inorganic materials 0.000 claims abstract description 8
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 8
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 8
- 239000003795 chemical substances by application Substances 0.000 abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000000203 mixture Substances 0.000 abstract description 5
- 229910052720 vanadium Inorganic materials 0.000 abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 4
- 230000002411 adverse Effects 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 229910052742 iron Inorganic materials 0.000 abstract description 4
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 abstract description 4
- 239000010955 niobium Substances 0.000 abstract description 4
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 4
- 239000011574 phosphorus Substances 0.000 abstract description 4
- 229910052710 silicon Inorganic materials 0.000 abstract description 4
- 239000010703 silicon Substances 0.000 abstract description 4
- 229910052717 sulfur Inorganic materials 0.000 abstract description 4
- 239000011593 sulfur Substances 0.000 abstract description 4
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 abstract description 4
- 229910000922 High-strength low-alloy steel Inorganic materials 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- 230000007704 transition Effects 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229910052777 Praseodymium Inorganic materials 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- PUDIUYLPXJFUGB-UHFFFAOYSA-N praseodymium atom Chemical compound [Pr] PUDIUYLPXJFUGB-UHFFFAOYSA-N 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229910052706 scandium Inorganic materials 0.000 description 1
- SIXSYDAISGFNSX-UHFFFAOYSA-N scandium atom Chemical compound [Sc] SIXSYDAISGFNSX-UHFFFAOYSA-N 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
Definitions
- the present invention relates to high-strength low-alloy steels having improved properties.
- the steels are particularly useful in the manufacture of electric-resistance welded line pipe.
- Non-metallic inclusions in a high-strength low-alloy steel reduce the steels resistance to ductile fracture and impair its forming properties. Deterioration of these properties increases with increasing numbers of inclusions and increasing inclusion elongation.
- the steels of the invention have particular applicability to the manufacture of welded line pipe and result in pipe of improved flattenabilty and toughness.
- the desired inclusion characteristics are achieved by controlling overall steel chemistry and deoxidation practice and, most importantly, by the use of an inclusion shape-control agent comprising zirconium, a rare earth, e.g., cerium, lanthanum, praseodymium, neodymium, yttrium, and scandium, or mischmetal which, of course, is a mixture of rare earths.
- an inclusion shape-control agent results in the formation of spherically shaped inclusions, particularly sulfide inclusions, which are not plastic at hot-rolling temperatures and consequently do not become elongated but retain their spherical shape in the finished steel.
- An object of the present invention is to provide steels of improved toughness and ductility. Another object of the invention is to provide welded line pipe characterized by improved flattenability and weld toughness.
- FIGURE of the drawing is a graphical representation of the improved impact properties possessed by the steels of the present invention.
- the steels of the present invention are fully aluminum-killed and have the following chemistry in weight percents: carbon, 0.10 to 0.20 percent; manganese, 0.85 to 1.25 percent; phosphorus, 0.10 percent maximum; sulfur, 0.05 percent maximum; silicon, in amounts not adversely affecting steel properties; columbium, 0.02 to 0.05 percent; vanadium, 0.10 percent maximum; and an inclusion shape-control agent comprising 0.04 to 0.20 percent zirconium, a minimum of about 0.02 percent of a rare earth or mischmetal; and balance iron.
- the inclusion shape-control agent preferably is added to the steel in the ingot mold or in the ladle after the steel has been killed.
- the requisite high strength is imparted to the steel by hot rolling it in a manner to achieve a finishing temperature within the range of l,550 to 1,650 F, followed by in-line cooling at a rate of to 135 F per second to a coiling or piling temperature within the range of 975 to 1,125 F.
- the spherically shaped inclusions formed through the use of the inclusion shape-control agent are not plastic at hot-rolling temperatures and retain their desired spherical form in the finished product.
- the manufacture of welded line pipe the steel is hot-rolled into skelp, formed, and electric-resistance welded.
- FIGURE of the drawing The superior impact properties possessed by welded line pipe manufactured according to the present invention is shown in the FIGURE of the drawing.
- the data on which the FIGURE is based were obtained from transverse one-half size Charpy V-notch specimens taken from 12% inch OD. electric-resistance-welded line pipe.
- All impact data fell within the cross-sectioned area of the figure. This type of steel has been used quite extensively in the manufacture of line pipe.
- Welded pipe runs 2, 3 and 4 comprised fully killed steels having compositions falling within the ranges of steels of the invention, as set out above, and containing zirconium as an inclusion shape-control agent.
- the tests reported in the table were carried out as described in paragraphs 4.14 through 4.16 of API Std. SLX, 16th edition, April 1969.
- Control of inclusion shape which is primarily responsible for the improved properties possessed by the steels of the present invention, is also obtained through the use of 0.01 to 0.10 percent of a rare earth or mixture of rare earths such as mischmetal.
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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)
Abstract
A steel composition having particular applicability to the manufacture of high-strength, low-alloy line pipe comprises 0.10 to 0.20 percent carbon, 0.85 to 1.25 percent manganese, 0.10 percent maximum phosphorus, 0.05 percent maximum sulfur, silicon in an amount not adversely affecting steel properties, 0.02 to 0.05 percent columbium, 0.10 percent maximum vanadium, an inclusion shape-control agent selected from the group consisting of zirconium, a rare earth or mischmetal, the balance iron.
Description
O United States Patent 1151 3,661,537
Aronson et al. 1 May 9, 1972 54] WELDED PIPE STRUCTURE OF HIGH 2,840,872 7/1958 Bidner ..75/129 x STRENGTH LOW ALLOY STEELS 2,861,908 11/1958 Mickelson 148/36 3,207,637 9/1965 Matuschka .....148/12.4 [72] lnventors: Arthur H. Aronson, Pittsburgh; Edward J. 3 231,712 V1966 15/123 R X 91 if i 3,544,393 12 1970 Zanetti ..148/12 samways 3,562,028 2/1971 Heitmann ..75/123 N x sburgh, all of Pa. [73] Assignee: Jones 8: Laughlin Steel Corporation, Pitt- FOREIGN PATENTS OR APPLICATIONS Sburgh, 1,120,588 7/1968 Great Britain ..75 123 E [22] Filed: July 16, 1969 Primary Examiner-L. Dewayne Rutledge PP- N05 8421285 Assistant Examiner-J. E. Legru Attorney-T. A. Zalenski and G. R. Harris [52] U.S. CI ..29/l91, 29/196], 75/123 E,
75/123 G, 75/123 11, 75 123 J ABSTRACT [51] Int.Cl ..B2ld39/02 A Stee com position having particular applicability to the Fleld of Search R, 123 E, H, l23 G, manufacture f higkbstrength y li comprises 75,123 148/121 29/191 196'l 0.10 to 0.20 percent carbon, 0.85 to 1.25 percent manganese, 0.10 percent maximum phosphorus, 0.05 percent maximum [56] References Cned sulfur, silicon in an amount not adversely affecting steel pro- UNn-ED STATES PATENTS perties, 002m 005 percent columbium, 0.10 percent maximum vanadium, an 1nclus1on shape-control agent selected 5 1 8/ 1951 from the group consisting of zirconium, a rare earth or 21810318 10/1957 mischmetal,the balance iron. 3,097,294 7/1963 3,303,060 2/1967 Shimizu ..l48/12.1 4 Claims, 1 Drawing Figure vi 0 5 A 1: J u.
TEMPERA TURE.
TEMPERA TURE,
INVENTORS ARTHUR H. ARONSON EDWARD J. LICHY NORMAN L. SAMWAYS CLIFFORD A. GUESS ATTORNEY WELDED PIPE STRUCTURE OF HIGH STRENGTH LOW ALLOY STEELS The present invention relates to high-strength low-alloy steels having improved properties. The steels are particularly useful in the manufacture of electric-resistance welded line pipe.
Non-metallic inclusions in a high-strength low-alloy steel reduce the steels resistance to ductile fracture and impair its forming properties. Deterioration of these properties increases with increasing numbers of inclusions and increasing inclusion elongation. We have developed high strength lowalloy steels having an inclusion type and morphology far less deleterious to toughness and formability. The steels of the invention have particular applicability to the manufacture of welded line pipe and result in pipe of improved flattenabilty and toughness.
The desired inclusion characteristics are achieved by controlling overall steel chemistry and deoxidation practice and, most importantly, by the use of an inclusion shape-control agent comprising zirconium, a rare earth, e.g., cerium, lanthanum, praseodymium, neodymium, yttrium, and scandium, or mischmetal which, of course, is a mixture of rare earths. The use of an inclusion shape-control agent results in the formation of spherically shaped inclusions, particularly sulfide inclusions, which are not plastic at hot-rolling temperatures and consequently do not become elongated but retain their spherical shape in the finished steel.
An object of the present invention is to provide steels of improved toughness and ductility. Another object of the invention is to provide welded line pipe characterized by improved flattenability and weld toughness.
These and other objects and advantages of the present invention will become apparent from the following detailed disclosure with reference to the FIGURE of the drawing which is a graphical representation of the improved impact properties possessed by the steels of the present invention.
The steels of the present invention are fully aluminum-killed and have the following chemistry in weight percents: carbon, 0.10 to 0.20 percent; manganese, 0.85 to 1.25 percent; phosphorus, 0.10 percent maximum; sulfur, 0.05 percent maximum; silicon, in amounts not adversely affecting steel properties; columbium, 0.02 to 0.05 percent; vanadium, 0.10 percent maximum; and an inclusion shape-control agent comprising 0.04 to 0.20 percent zirconium, a minimum of about 0.02 percent of a rare earth or mischmetal; and balance iron. To insure good recovery, the inclusion shape-control agent preferably is added to the steel in the ingot mold or in the ladle after the steel has been killed.
The requisite high strength is imparted to the steel by hot rolling it in a manner to achieve a finishing temperature within the range of l,550 to 1,650 F, followed by in-line cooling at a rate of to 135 F per second to a coiling or piling temperature within the range of 975 to 1,125 F. As indicated above, the spherically shaped inclusions formed through the use of the inclusion shape-control agent are not plastic at hot-rolling temperatures and retain their desired spherical form in the finished product. In its preferred application, the manufacture of welded line pipe, the steel is hot-rolled into skelp, formed, and electric-resistance welded.
The superior impact properties possessed by welded line pipe manufactured according to the present invention is shown in the FIGURE of the drawing. The data on which the FIGURE is based were obtained from transverse one-half size Charpy V-notch specimens taken from 12% inch OD. electric-resistance-welded line pipe. For line pipe manufactured from a semi-killed columbium-vanadium high-strength lowalloy steel not containing an inclusion control agent, all impact data fell within the cross-sectioned area of the figure. This type of steel has been used quite extensively in the manufacture of line pipe. All of the individual data points plotted on the figure were obtained from specimens having chemistries within the ranges of the steels of the present invention, as set out above, and employing zirconium as the inclusion shapecontrol agent. The dashed curve drawn through these oints is a conservative estimate of the transition curve and 11 ustrates that, typically, the steels of the present invention result in pipe with transverse l2 ft.-lb. transition temperatures of minus 30 F.
Improved flattening behavior of welded pipe manufactured from the steels of the present invention is shown in the following table:
high-strength low-alloy steel of the type referred to above. Welded pipe runs 2, 3 and 4 comprised fully killed steels having compositions falling within the ranges of steels of the invention, as set out above, and containing zirconium as an inclusion shape-control agent. The tests reported in the table were carried out as described in paragraphs 4.14 through 4.16 of API Std. SLX, 16th edition, April 1969.
Control of inclusion shape, which is primarily responsible for the improved properties possessed by the steels of the present invention, is also obtained through the use of 0.01 to 0.10 percent of a rare earth or mixture of rare earths such as mischmetal.
We claim:
1. A welded pipe structure formed of a fully killed steel having a composition consisting essentially of 0.10 to 0.20 percent carbon, 0.85 to 1.25 percent manganese, 0.10 percent maximum phosphorus, 0.05 percent maximum sulfur, silicon in an amount not adversely affecting steel properties, 0.02 to 0.05 percent columbium, 0.10 percent maximum vanadium, an inclusion shape-control agent selected from the group consisting of 0.04 to 0.20 percent zirconium, 0.01 to 0.10 percent of a rare earth and 0.01 to 0.10 percent mischmetal, balance iron.
2. A welded pipe structure as defined in claim 1 wherein the inclusion shape-control agent comprises 0.04 to 0.20 percent zirconium.
3. A welded pipe structure as defined in claim 1 wherein the inclusion shape-control agent comprises 0.01 to 0.10 percent of a rare earth.
4. A welded pipe structure as defined in claim 1 wherein the inclusion shape-control agent comprises 0.01 to 0.10 percent mischmetal.
Claims (3)
- 2. A welded pipe structure as defined in claim 1 wherein the inclusion shape-control agent comprises 0.04 to 0.20 percent zirconium.
- 3. A welded pipe structure as defined in claim 1 wherein the inclusion shape-control agent comprises 0.01 to 0.10 percent of a rare earth.
- 4. A welded pipe structure as defined in claim 1 wherein the inclusion shape-control agent comprises 0.01 to 0.10 percent mischmetal.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US84228569A | 1969-07-16 | 1969-07-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3661537A true US3661537A (en) | 1972-05-09 |
Family
ID=25286958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US842285A Expired - Lifetime US3661537A (en) | 1969-07-16 | 1969-07-16 | Welded pipe structure of high strength low alloy steels |
Country Status (1)
| Country | Link |
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| US (1) | US3661537A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3816103A (en) * | 1973-04-16 | 1974-06-11 | Bethlehem Steel Corp | Method of deoxidizing and desulfurizing ferrous alloy with rare earth additions |
| US3860777A (en) * | 1974-04-03 | 1975-01-14 | American Metal Climax Inc | Process for welding low-alloy steels containing niobium |
| US3871870A (en) * | 1973-05-01 | 1975-03-18 | Nippon Kokan Kk | Method of adding rare earth metals or their alloys into liquid steel |
| US3920051A (en) * | 1974-08-20 | 1975-11-18 | Jones & Laughlin Steel Corp | Corrosion resistant continuous weld pipe |
| US3997372A (en) * | 1974-06-03 | 1976-12-14 | Republic Steel Corporation | High strength low alloy steel |
| US4042380A (en) * | 1975-05-14 | 1977-08-16 | Kobe Steel, Ltd. | Grain refined free-machining steel |
| FR2350776A1 (en) * | 1976-05-14 | 1977-12-09 | Int Harvester Co | DISC-SHAPED TOOL FOR WORKING THE SOIL |
| US4370178A (en) * | 1981-06-30 | 1983-01-25 | Republic Steel Corporation | Method of making as-pierced tubular products |
| US4397698A (en) * | 1979-11-06 | 1983-08-09 | Republic Steel Corporation | Method of making as-hot-rolled plate |
| US4400223A (en) * | 1981-08-21 | 1983-08-23 | Inland Steel Company | Hot rolled steel product and method for producing same |
| US5379805A (en) * | 1992-12-16 | 1995-01-10 | Construction Forms | Single solid thin wall pipe for abrasive material having a gradual transition in hardness |
| CN100491573C (en) * | 2006-09-07 | 2009-05-27 | 武汉大学 | A kind of low-carbon micro-alloy cast steel and preparation method thereof |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2564004A (en) * | 1949-05-17 | 1951-08-14 | Inland Steel Co | Structural steel |
| US2810818A (en) * | 1957-05-16 | 1957-10-22 | Air Reduction | Welding of low alloy steel |
| US2840872A (en) * | 1952-01-14 | 1958-07-01 | Sharon Steel Corp | Method of economically introducing zirconium into steel |
| US2861908A (en) * | 1955-11-30 | 1958-11-25 | American Steel Foundries | Alloy steel and method of making |
| US3097294A (en) * | 1963-07-09 | Electric arc welding and wire therefor | ||
| US3207637A (en) * | 1961-12-21 | 1965-09-21 | Matuschka Bernhard | Structural steel and process for making same |
| US3231712A (en) * | 1953-06-16 | 1966-01-25 | Union Carbide Corp | Carbon steel oxy-inert monatomic gasshielded metal-arc welding |
| US3303060A (en) * | 1962-06-05 | 1967-02-07 | Yawata Iron & Steel Co | Atmospheric corrosion-resistant steel sheet for deep drawing |
| GB1120588A (en) * | 1965-12-29 | 1968-07-17 | Murex Welding Processes Ltd | Improvements in arc welding electrodes |
| US3544393A (en) * | 1967-08-11 | 1970-12-01 | Nat Steel Corp | Method of manufacturing low carbon high tensile strength alloy steel |
| US3562028A (en) * | 1968-08-28 | 1971-02-09 | Inland Steel Co | Tough,high strength steel article |
-
1969
- 1969-07-16 US US842285A patent/US3661537A/en not_active Expired - Lifetime
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3097294A (en) * | 1963-07-09 | Electric arc welding and wire therefor | ||
| US2564004A (en) * | 1949-05-17 | 1951-08-14 | Inland Steel Co | Structural steel |
| US2840872A (en) * | 1952-01-14 | 1958-07-01 | Sharon Steel Corp | Method of economically introducing zirconium into steel |
| US3231712A (en) * | 1953-06-16 | 1966-01-25 | Union Carbide Corp | Carbon steel oxy-inert monatomic gasshielded metal-arc welding |
| US2861908A (en) * | 1955-11-30 | 1958-11-25 | American Steel Foundries | Alloy steel and method of making |
| US2810818A (en) * | 1957-05-16 | 1957-10-22 | Air Reduction | Welding of low alloy steel |
| US3207637A (en) * | 1961-12-21 | 1965-09-21 | Matuschka Bernhard | Structural steel and process for making same |
| US3303060A (en) * | 1962-06-05 | 1967-02-07 | Yawata Iron & Steel Co | Atmospheric corrosion-resistant steel sheet for deep drawing |
| GB1120588A (en) * | 1965-12-29 | 1968-07-17 | Murex Welding Processes Ltd | Improvements in arc welding electrodes |
| US3544393A (en) * | 1967-08-11 | 1970-12-01 | Nat Steel Corp | Method of manufacturing low carbon high tensile strength alloy steel |
| US3562028A (en) * | 1968-08-28 | 1971-02-09 | Inland Steel Co | Tough,high strength steel article |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3816103A (en) * | 1973-04-16 | 1974-06-11 | Bethlehem Steel Corp | Method of deoxidizing and desulfurizing ferrous alloy with rare earth additions |
| US3871870A (en) * | 1973-05-01 | 1975-03-18 | Nippon Kokan Kk | Method of adding rare earth metals or their alloys into liquid steel |
| US3860777A (en) * | 1974-04-03 | 1975-01-14 | American Metal Climax Inc | Process for welding low-alloy steels containing niobium |
| US3997372A (en) * | 1974-06-03 | 1976-12-14 | Republic Steel Corporation | High strength low alloy steel |
| US3920051A (en) * | 1974-08-20 | 1975-11-18 | Jones & Laughlin Steel Corp | Corrosion resistant continuous weld pipe |
| US4042380A (en) * | 1975-05-14 | 1977-08-16 | Kobe Steel, Ltd. | Grain refined free-machining steel |
| FR2350776A1 (en) * | 1976-05-14 | 1977-12-09 | Int Harvester Co | DISC-SHAPED TOOL FOR WORKING THE SOIL |
| US4098622A (en) * | 1976-05-14 | 1978-07-04 | International Harvester Company | Earth-working implement |
| US4397698A (en) * | 1979-11-06 | 1983-08-09 | Republic Steel Corporation | Method of making as-hot-rolled plate |
| US4370178A (en) * | 1981-06-30 | 1983-01-25 | Republic Steel Corporation | Method of making as-pierced tubular products |
| US4400223A (en) * | 1981-08-21 | 1983-08-23 | Inland Steel Company | Hot rolled steel product and method for producing same |
| US5379805A (en) * | 1992-12-16 | 1995-01-10 | Construction Forms | Single solid thin wall pipe for abrasive material having a gradual transition in hardness |
| CN100491573C (en) * | 2006-09-07 | 2009-05-27 | 武汉大学 | A kind of low-carbon micro-alloy cast steel and preparation method thereof |
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|---|---|---|---|
| AS | Assignment |
Owner name: JONES & LAUGHLIN STEEL, INCORPORATED Free format text: MERGER;ASSIGNORS:JONES & LAUGHLIN STEEL CORPORATION, A CORP. OF PA.;YOUNGTOWN SHEET & TUBE COMPANY,A CORP. OF OH. (MERGED INTO);NEW J&L STEEL CORPRATION, A CORP. OF DE., (CHANGED TO);REEL/FRAME:004510/0801 Effective date: 19851018 |
|
| AS | Assignment |
Owner name: LTV STEEL COMPANY, INC., Free format text: MERGER AND CHANGE OF NAME EFFECTIVE DECEMBER 19, 1984, (NEW JERSEY);ASSIGNORS:JONES & LAUGHLIN STEEL, INCORPORATED, A DE. CORP. (INTO);REPUBLIC STEEL CORPORATION, A NJ CORP. (CHANGEDTO);REEL/FRAME:004736/0443 Effective date: 19850612 |