US3753788A - Non-ribbing ferritic steel and process - Google Patents
Non-ribbing ferritic steel and process Download PDFInfo
- Publication number
- US3753788A US3753788A US00189787A US3753788DA US3753788A US 3753788 A US3753788 A US 3753788A US 00189787 A US00189787 A US 00189787A US 3753788D A US3753788D A US 3753788DA US 3753788 A US3753788 A US 3753788A
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- United States
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- percent
- ribbing
- strip
- steel
- boron
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
Definitions
- ABSTRACT Low carbon ferritic stainless steel containing about 14-18 percent chromium, 0.0005 to 0.005 percent boron, up to about 0.12 percent, and preferably 0.02 to 0.12 percent columbium, characterized by substantial freedom from ribbing in unidirectionally hot rolling and thence unidirectionally cold rolling into thin gauge strip; also cold rolled strip in long lengths made of said steel and methods of producing same.
- This invention pertains to improvements in low carbon, ferritic, stainless steel containing about 14 to 18 percent chromium for preventing ribbing in rolling into strip and to the production of unribbed strip therefrom.
- Ribbing or ridging manifests itself when certain metals or alloys are unidirectionally rolled into strip in long lengths or coils, and occurs when such a product is unequally strained or elongated in the direction of rolling. When strained in this manner, longitudinal ridges occur which are parallel to the rolling direction. Often the ridges are readily apparent to the eye, and the transverse wave-like appearance is especially evident. Obviously, ribbing or ridging is deleterious and cannot be tolerated to any appreciable degree in products manufactured from strip metal. For brevity, this phenomenon will be hereinafter designated as ribbing.”
- the austenitic stainless steels are, generally speaking, not subject to such ribbing on unidirectionally hot and thence cold rolling into thin strip. But I have discovered that such is not the case in the rolling of the essentially straight chromium, ferritic, stainless steels containing chromium in the range of about 14-18 percent.
- this ribbing effect occurring in the rolling of chromium stainless steels of the character aforesaid may be substantially or completely eliminated by incorporating in the steel in the course of melting, a small but significant amount of boron, together preferably with the addition of a small but significant amount of columbium, the boron content constituting about 0.0005 to 0.005 percent by weight of the total, and the columbium content about 0.02-0.l2 percent.
- the aforesaid ribbing tendency is influenced by the size of the ingot from which the strip is produced; the greater the ingot size, the greater the ribbing tendency.
- ingot thickness influences freezing rate. The thicker ingots freeze more slowly than thinner ingots, thereby producing a coarser and more segregated ingot structure. Boron additions alone or as supplemented by columbium additions within limits above stated, inhibit this natural segregation tendency and thus produce structures more comparable to thinner ingots.
- the boron may be alloyed with the essentially straight chromium steel as produced, for example, in the electric furnace by furnace or ladle additions to the molten steel in the form of boron, Fe.boron, borosil, etc. Columbium may be similarly added.
- EXAMPLE 1 The ribbing effect and its elimination by boron additions in accordance with the invention, is exemplified in the production and subsequent rolling of type 434 electric furnace steel of base composition: carbon 0.12
- the ingots were heated in soaking pits and hot rolled thence in the blooming mill into 6 A X 18 to 37 inch slabs, one slab per ingot.
- the slabs were skin ground, reheated, and fed into a 56 inch continuous hot strip mill and hot rolled in a single pass into 0.117 to 0.140 inch X 18 inches to 37 inch coils.
- the coils were box annealed, then subjected to a continuous blast and pickling in sulphuric, and nitric-hydrofluoric acids.
- the coils were then cold rolled in a cold reversing mill to 005-006 inch gauge on 60 and grit rolls.
- the cold rolled coils were then strand annealed, and thence electrolytically pickled in nitric or sulphuric acid.
- the coils were then further cold rolled in a reversing or Sendzimir mill to finish gauge of 0.015-0.025 inch on 280 and 400 grit rolls.
- the coils were then atmosphere annealed in an atmosphere of cracked ammonia gas.
- the coils were then given a skin or temper pass. The product was rated for ribbing at finish gauge following the temper pass operation.
- EXAMPLE III In order to demonstratethe effects of both boron plus columbium additions, an electric furnace heat was produced of modified type 434 steel containing 12 points of columbium, this heat being of the following analysis: 0.077% C, 0.36% Mn, 0.019% P, 0.012% S, 0.05% Si, 0.10% Cu, 0.26% Ni, 16.70% Cr, 0.84% Mo, 0.008% Sn, 0.020% A1, 0.12% (lb, 0.001% Pb. This heat was treated in the ladle with borosil to contain 0.0015-0.002 percent boron.
- Example II The heat was cast into ingots and processed as above described in Example I into hot rolled and thence into cold rolled strip in coils, some in strip widths of 27 A inches and others in strip widths of 19 A inches.
- the narrow band strip showed no ribbing at any time during the processing.
- the wide band strip showed light ribbing at intermediate and finish gauge anneals which, however, was substantially eliminated by the final skinning or temper pass.
- the method of producing cold rolled strip in long lengths substantially free from riblbing, from a ferritic, stainless steel containing about 14- to 18 percent chromium, balance substantially iron which comprises: producing a molten bath of said steel, alloying therestrip is cold rolled to final gauge of about 0.015 to 0.025 inch.
- said steel as cast consists essentially of about: l4 to 18 percent chromium, 0.7 to 1 percent molybdenum, 0.0005 to 0.005 percent boron, 0.02 to 0.12% columbium, up to 0.12% carbon, up to 1% each of manganese and silicon, up to 0.03 and 0.04% sulphur and phosphorus, respectively, balance iron, except for impurities within commercial tolerances.
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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 Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
Description
Claims (3)
- 2. The method according to claim 1 wherein said steel is cast into ingots of at least 25 X 36 inches in size.
- 3. The method according to claim 2 wherein said strip is cold rolled to final gauge of about 0.015 to 0.025 inch.
- 4. The method according to claim 1 wherein said steel as cast consists essentially of about: 14 to 18 percent chromium, 0.7 to 1 percent molybdenum, 0.0005 to 0.005 percent boron, 0.02 to 0.12% columbium, up to 0.12% carbon, up to 1% each of manganese and silicon, up to 0.03 and 0.04% sulphur and phosphorus, respectively, balance iron, except for impurities within commercial tolerances.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US18978771A | 1971-10-15 | 1971-10-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3753788A true US3753788A (en) | 1973-08-21 |
Family
ID=22698776
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00189787A Expired - Lifetime US3753788A (en) | 1971-10-15 | 1971-10-15 | Non-ribbing ferritic steel and process |
Country Status (1)
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US (1) | US3753788A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4450008A (en) * | 1982-12-14 | 1984-05-22 | Earle M. Jorgensen Co. | Stainless steel |
US4465525A (en) * | 1980-03-01 | 1984-08-14 | Nippon Steel Corporation | Ferritic stainless steel having excellent formability |
US4834808A (en) * | 1987-09-08 | 1989-05-30 | Allegheny Ludlum Corporation | Producing a weldable, ferritic stainless steel strip |
GB2371560B (en) * | 2000-12-15 | 2005-07-13 | Hitachi Metals Ltd | Wire for reinforcing glass, glass sealing the same and glass plate having stainless steel wire sealed |
JP2015145531A (en) * | 2014-02-04 | 2015-08-13 | 新日鐵住金ステンレス株式会社 | Ferritic stainless steel excellent in anticorrosiveness of after-polishing |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2750283A (en) * | 1953-05-27 | 1956-06-12 | Armco Steel Corp | Stainless steels containing boron |
US2808353A (en) * | 1953-09-22 | 1957-10-01 | Sharon Steel Corp | Method of making deep drawing stainless steel |
US2905577A (en) * | 1956-01-05 | 1959-09-22 | Birmingham Small Arms Co Ltd | Creep resistant chromium steel |
US2965479A (en) * | 1959-01-26 | 1960-12-20 | Universal Cyclops Steel Corp | Non-ridging stainless steels |
US3128211A (en) * | 1961-08-14 | 1964-04-07 | Armco Steel Corp | Process for minimizing ridging in chromium steels |
US3139358A (en) * | 1961-06-14 | 1964-06-30 | Allegheny Ludlum Steel | Method of preventing ribbing and roping |
US3309238A (en) * | 1962-05-16 | 1967-03-14 | Suedwestfalen Ag Stahlwerke | Deep drawing of stainless steels, and steel therefor |
US3490956A (en) * | 1965-06-03 | 1970-01-20 | Allegheny Ludlum Steel | Method of producing ferritic stainless steel |
US3655459A (en) * | 1970-08-13 | 1972-04-11 | United States Steel Corp | METHOD FOR PRODUCING MINIMUM-RIDGING TYPE 430 Mo STAINLESS STEEL SHEET AND STRIP |
-
1971
- 1971-10-15 US US00189787A patent/US3753788A/en not_active Expired - Lifetime
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2750283A (en) * | 1953-05-27 | 1956-06-12 | Armco Steel Corp | Stainless steels containing boron |
US2808353A (en) * | 1953-09-22 | 1957-10-01 | Sharon Steel Corp | Method of making deep drawing stainless steel |
US2905577A (en) * | 1956-01-05 | 1959-09-22 | Birmingham Small Arms Co Ltd | Creep resistant chromium steel |
US2965479A (en) * | 1959-01-26 | 1960-12-20 | Universal Cyclops Steel Corp | Non-ridging stainless steels |
US3139358A (en) * | 1961-06-14 | 1964-06-30 | Allegheny Ludlum Steel | Method of preventing ribbing and roping |
US3128211A (en) * | 1961-08-14 | 1964-04-07 | Armco Steel Corp | Process for minimizing ridging in chromium steels |
US3309238A (en) * | 1962-05-16 | 1967-03-14 | Suedwestfalen Ag Stahlwerke | Deep drawing of stainless steels, and steel therefor |
US3490956A (en) * | 1965-06-03 | 1970-01-20 | Allegheny Ludlum Steel | Method of producing ferritic stainless steel |
US3655459A (en) * | 1970-08-13 | 1972-04-11 | United States Steel Corp | METHOD FOR PRODUCING MINIMUM-RIDGING TYPE 430 Mo STAINLESS STEEL SHEET AND STRIP |
Non-Patent Citations (1)
Title |
---|
Proceedings of Electric Furnace Conference, 1961, Non-Roping Ferritic Chromium Steels, Thompson et al., pgs. 70 85. * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4465525A (en) * | 1980-03-01 | 1984-08-14 | Nippon Steel Corporation | Ferritic stainless steel having excellent formability |
US4450008A (en) * | 1982-12-14 | 1984-05-22 | Earle M. Jorgensen Co. | Stainless steel |
US4834808A (en) * | 1987-09-08 | 1989-05-30 | Allegheny Ludlum Corporation | Producing a weldable, ferritic stainless steel strip |
GB2371560B (en) * | 2000-12-15 | 2005-07-13 | Hitachi Metals Ltd | Wire for reinforcing glass, glass sealing the same and glass plate having stainless steel wire sealed |
JP2015145531A (en) * | 2014-02-04 | 2015-08-13 | 新日鐵住金ステンレス株式会社 | Ferritic stainless steel excellent in anticorrosiveness of after-polishing |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: FIRST NATIONAL BANK OF BOSTON THE,, MASSACHUSETTS Free format text: SECURITY INTEREST;ASSIGNOR:J & L SPECIALTY PRODUCTS CORPORATION, A CORP. OF DE.;REEL/FRAME:004546/0750 Effective date: 19860915 Owner name: FIRST NATIONAL BANK OF BOSTON THE, Free format text: SECURITY INTEREST;ASSIGNOR:J & L SPECIALTY PRODUCTS CORPORATION, A CORP. OF DE.;REEL/FRAME:004546/0750 Effective date: 19860915 |
|
AS | Assignment |
Owner name: J & L SPECIALTY PRODUCTS CORPORATION Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:LTV STEEL SPECIALTY PRODUCTS COMPANY;REEL/FRAME:004585/0272 Effective date: 19860428 |
|
AS | Assignment |
Owner name: LTV STEEL SPECIALTY PRODUCTS COMPANY,PENNSYLVANIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LTV STEEL COMPANY, INC.;REEL/FRAME:004911/0534 Effective date: 19860312 Owner name: LTV STEEL SPECIALTY PRODUCTS COMPANY, 1600 WEST CA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:LTV STEEL COMPANY, INC.;REEL/FRAME:004911/0534 Effective date: 19860312 |