US2816052A - Method of manufacturing ribbed steel rods - Google Patents

Method of manufacturing ribbed steel rods Download PDF

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Publication number
US2816052A
US2816052A US46760254A US2816052A US 2816052 A US2816052 A US 2816052A US 46760254 A US46760254 A US 46760254A US 2816052 A US2816052 A US 2816052A
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Prior art keywords
steel
steel rod
rod
ribs
cold
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Hoff Hubert
Fischer Georg
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HOESCH WESTFALENHUTTE AG
HOESCH-WESTFALENHUTTE AG
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HOESCH WESTFALENHUTTE AG
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/02—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance
    • E04C5/03—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance with indentations, projections, ribs, or the like, for augmenting the adherence to the concrete
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
    • B21B1/163—Rolling or cold-forming of concrete reinforcement bars or wire ; Rolls therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/14—Twisting
    • B21D11/15—Reinforcing rods for concrete
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H3/00—Making helical bodies or bodies having parts of helical shape
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/41—Preparation of salts of carboxylic acids
    • C07C51/416—Henkel reaction and related reactions, i.e. rearrangement of carboxylate salt groups linked to six-membered aromatic rings, in the absence or in the presence of CO or CO2, (e.g. preparation of terepholates from benzoates); no additional classification for the subsequent hydrolysis of the salt groups has to be given
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the present invention relates to a method of manufacturing ribbed steel rods, and more particularly to a method of manufacturing ribbed steel rods used for reinforcing of concrete.
  • Hot-rolled Thomas rib steel while possessing greater strength also does not have suicient tenacity.
  • lt is an object of the present invention to provide a method for the manufacture of ribbed steel rods which overcomes all of the above-mentioned disadvantages.
  • lt is a further object of the present invention to provide a method for the manufacture of ribbed steel rods for reinforcing concrete which in addition to the aforementioned advantages have a high degree of notch impact tenacity.
  • the present invention mainly consists in a method of manufacturing ribbed steel rods for reinforcing concrete comprising the steps of cold-rolling a steel rod and deforming the' same so as to reduce its dimensions in one cross-sectional direction by at least 30%, thereafter tempering the cold-rolled deformed steel rod at a temperature ranging between 450 and 600 Centigrade for at least l5 minutes, and forming ribs on the steel rod not less than 15 minutes before termination of the tempering whereby the cold-rolled deformed steel rod with the ribs thereon is tempered for at least 15 minutes at the indicated temperature.
  • the method of the present invention comprises the steps of cold rolling a steel rod having an oblong cross section and deforming the same so as to reduce its dimensions in one cross sectional direction by at least 30% and to form a circular cross section; forming straight longitudinal ribs on the steel rod equally spaced from each other in circumferential direction, twisting the so-formed rod lso that each of the straight longitudinal ribs is deformed into a helical rib, the distance of the thus-formed helical ribs from each other being equal to about 0.7 time the diameter of the deformed steel rod and the pitch of the heli-cal ribs being less than 6 times the diameter of the deformed steel rod, and thereafter tempering the steel rod at a temperature ranging between 450 and 600 centigrade for at lesat l5 minutes.
  • the cold rolling of Steel rods is performed in such a way as to achieve a decrease in the thicknesses of the rods equal to a deformation of at least 30% in the area between the ribs.
  • the tempering is performed at a temperature of between 450 and 600 C. for a sufficiently long period of time so as to obtain increasing values for notch impact resistance without appreciable decrease in the elastic limit and strength of the steel rod.
  • the fillet-shaped area -connecting the ribs with the steel rod is in accordance with the present invention exposed to even greater deformation, preferably ranging between 30 and 60%. Due to the increased deformation recrystallization takes place in this area during tempering, and consequently stresses which otherwise might cause formation of cracks are relieved. This is achieved by forming the ribs in such a way that the cross-section of the area connecting the ribs with the steel rod forms an arc of very small radius.
  • the ribs may be rolled onto the rod either cold or at tempering temperatures.
  • the rod prior to the cold-rolling process of the present invention may have various cross-sections such as for instance oblong, rectangular or circular, and may have been produced by a hot or cold rolling process. It is then cold-rolled and deformed to the desired cross-section. For instance, a rod of square cross-section is cold-rolled into a rod of elongated rectangular cross-section or vice versa; a rod of ovall cross-section is cold-rolled into a inite range of temperature.
  • rod of circular cross-section or a rod of circular crosssection is cold-rolled to a rod having a cross-section of oval shape, both having transversal ribs.
  • the crosssection of the rod may be changed by cold-rolling in accordance with the present invention in any desired way, provided that a deformation of at least takes place during the cold-rolling.
  • the rod can be cold-rolled along two axes perpendicular to each other in order to achieve deformation of at least 30% and to form at the same time ribs on the surface of the rod.
  • the tempering following deformation of the rod in excess of the above stated minimum, has to be carried out within the temperature range of 450 to 600J centigrade, in order to achieve a considerable increase in tenacity and ductility concurrent with a high elastic limit and great strength of the steel rod.
  • Tempering at a temperature below 450 centigrade tends to improve only the elastic limit which has been reduced during cold deformation, however, it does not appreciably change the notch impact tenacity in stress areas such as the fillet or notch-like areas connecting the ribs with the main body of the rod.
  • the notch impact tenacity increases with increasing deformation and higher tempering temperatures, whereby the elastic limit or yield point and the strength of the steel rod continue to increase with Vthe increase in'deformation causing reduction ofthe thickness of the rod in one direction.
  • the usual tempering time of between 2 and 5 minutes is not suflcient to achieve the desired increase in notch impact tenacity.
  • the tempering process has to extend over a period of from 15 to 90 minutes.
  • the notch impact tenacity of cold deformed soft Thomas steel is considerably improved.
  • a very high degree of cold deformation corresponding to a reduction in thickness of about 60%, followed by suitable tempering, for instance of one hour at 500 centigrade, it is possible to approximately regain the notch impact tenacity of the hot-rolled initial material, while at the same time increasing the elastic limit to about 2.5 times its initial value.
  • the process of the presentinvention is especially suitable for the manufacture of ribbed concrete reinforcing rods belonging to groups IIIb and IVbof the German standards DIN 1045 'which were described further above.
  • Fig. 1 is a graph showing the stretch limit of steel under tempering conditions in accordance with the present invention, in relation to the degree of cold deformation;
  • Fig. 2 is a graph showing the impact tenacity of steel under tempering conditions in accordance with the present invention, in relation to the degree of cold deformation;
  • Fig. 3 is a cross-sectional view of a cylindrical steel rod prior to deformation in accordance with the present invention.
  • Fig. 4 is a cross-sectional view of the steel rod shown in Fig. 3, after deformation;
  • Fig. 5 is a plan view of the steel rod shown in Fig. 4;
  • Fig. 6 is a cross-sectional view of an oval steel rod prior to deformation in accordance with the present invention.
  • Fig. 7 is a cross-sectional View of the steel rod shown in Fig. 6, after deformation;
  • Fig. 8 is a plan view of the steel rod shown in'Fig. 7;
  • Fig. 9 is a cross-sectional view of a steel rod provided with longitudinal ribs in accordance with the present invention.
  • Fig. 10 is a plan view of the steel rod shown in Fig. 9 after twisting of the same.
  • Fig. 1 The relationship between the reduction of thickness and the elastic limit at tempering temperatures of 450 and 500 centigrade and at a tempering time of one hour is shown in Fig. 1, while Fig. 2 shows the change in the notch impact tenacity under deformation and tempering conditions identical with those of Fig. 1.
  • the tempering time depends on the size of the cross-section of the steel rod.
  • the elastic limit increases with the increase in cold deformation, while the notch impact tenacity decreases upon application of a small degree of cold deformation and only starts to increase when the degree of cold deformation reaches values approaching 40%.
  • the notch impact tenacity shows a very high rate of increase.
  • FIGs 1 and 2 ygraphically illustrate why in accordance with the present invention the area connecting the ribs with the main body of the rod has to be deformed to a higher degree than the other portions of the ribbed steel rod. As shown in these figures a sufficiently high value for the elastic limit is obtained when deformation exceeds 30%, while deformation between 40 and 60% in the critical area between the ribs and the rod is needed to obtain a satisfactory increase in the impact tenacity.
  • Twisting of the steel rod to the extent indicated above and subsequent tempering for a period of between and 90 minutes, depending on the size of the cross-section of the ribbed rods, at a temperature of between 450 and 600 C. will cause the notch impact tenacity to increase again, without appreciable reduction of the high elastic limit and strength achieved by the cold twisting of the rod.
  • helical ribs formed from longitudinal ribs by twisting of the steel rod, arranged at such slope as to show a certain similarity with rods having transversal ribs.
  • transversal ribs on concrete reinforcing rods possess the extraordinary advantage of increasing the adherence of the concrete to the reinforcing rod.
  • the steep helical ribs of conventionally twisted reinforcing rods provide a somewhat better adherence than smooth rib-less reinforcing rods.
  • Conventional reinforcing rods with transversal ribs have the ribs arranged in a distance from each other which is about equal to 0.7 times the diameter or maximum dimension of the cross-section of the reinforcing rod, in order to enforce a desirable formation of cracks in the concrete; that is to obtain as many cracks as possible, which are, consequently, of small width.
  • the same eect can be achieved by a reinforcing rod which is strongly twisted in accordance with the present invention, if the number of longitudinal ribs which are equally spaced from each other in circumferential direction is chosen in relation to the pitch of the helical ribs obtained after twisting in such a way that the distance between adjoining ribs deformed by twisting into helical ribs, amounts to approximately 0.7 times the diameter or maximum ydimension of the cross-section of the steel rod.
  • a Thomas steel which -has been produced with the addition of oxygen to the air blast. Due to the enrichment in oxygen content, the nitrogen content of the steel is reduced to values below those found in regular Thomas steel. This low nitrogen-content steel is especially suitable to withstand the high twisting operation performed in accordance with the present invention. Preferably the nitrogen content of the steel is kept below 0.012%. Obviously different types of Thomas steel in which the nitrogen content has been lowered by various processes can also be used, as well as open hearth steel.
  • Figs. 3, 4 and 5 show a steel rod of initially circular cross-section before and after deformation in accordance with the present invention.
  • the steel rod blank having a diameter rz as shown in Fig. 3 is deformed in the direction of diameter a to an extent exceeding 30%.
  • diameter a has been reduced to diameter a1 for the main body of the deformed steel rod, and to diameter a2 for the ribs rolled on the main body of the steel rod.
  • b indicates the fillet area connecting the ribs with the main body of the steel rod, which area in accordance with the present invention is deformed to a degree exceeding the degree of deformation of the steel rod, preferably to a degree of between 30 and 60%, and in which area recrystallization and release of stress is achieved during the subsequent tempering process.
  • Figs. 6, 7 and 8 show the deformation and formation of ribs on a steel rod blank of initially oval crosssection.
  • the original steel rod has a longest axis c and a shortest axis d as shown in Fig. 6.
  • the rod is colddeformed so as to reduce the longest axis c to c1 for the main body of the steel rod and to c2 for the ribs rolled on the main body. This reduction in length of the longest axis of the original steel rod, as shown in Fig. 7, exceeds 30%.
  • Fig. 8 two longitudinal ribs and a plurality of transversal ribs were rolled on the main body of the steel rod.
  • the llet areas connecting the ribs with the main body of the rod which in accordance with the present invention have been deformed to a degree exceeding the deformation of the main body of the rod are indicated in Fig. 8 by the letter e.
  • the difference in the degree of deformation between these areas e and the main body of the steel rod is such that upon tempering at temperatures between 450 and 600 for a period of time of l5 to 90 minutes, recrystallization takes place in the areas e only and not in the main body of the steel rod.
  • the upper limit of tempering temperature is chosen in accordance with the degrees of deformation actually applied, but in any event not to exceed 600 C. so as to prevent recrystallization in the main body of the steel rod.
  • Fig. l0 shows a steel rod having helical ribs formed on its surface by the process of twisting a steel rod having longitudinal ribs equally spaced from each other in circumferential direction.
  • lt specifically shows the relationship between the diameter g of the steel rod, the distance of adjoining helical ribs from each other, and the pitch of the helical ribs.
  • the distance between adjoining helical ribs is equal to 0.7 times the diameter of the steel rod and the pitch of the helical ribs equals 4 times the diameter of the steel rod.
  • the high twist of the steel rod and the consequently relatively small pitch of the ribs causes provided with transversal ribs.
  • a method of manufacturing ribbed steel rods for reinforcing concrete comprising the steps of cold-rolling a steel rod consisting of Thomas steel and deforming the same so as to reduce its dimension in one cross-sectional direction by at least 40%; thereafter tempering said coldrolled deformed steel rod at a temperature ranging between 450 and 600 centigrade for at least l5 minutes, and forming ribs on said steel rod not less than 15 minutes before termination of said tempering so that said coldrolled deformed steel rod with said ribs thereon is tempered for at least 15 minutes at the indicated temperature, whereby a ribbed steel rod of high elastic ⁇ limit and high notch impact tenacity is formed.
  • a method of manufacturing ribbed steel rods for reinforcing concrete comprising the steps of cold-rolling a steel rod and deforming the same so as to reduce its a steel rod consisting of Thomas steel and deforming the same so as to reduce its dimensions in one cross-sectional direction by at least 40%; thereafter tempering said coldrolled deformed steel rod at a temperature of approximately 500 centigrade for between l5 and 90 minutes, and forming ribs on said steel rods not less than l5 minutes before termination of said tempering-so that said cold-rolled deformed steel rod with said ribs thereon is ⁇ tempered for at least l5 minutes -at the indicated 'ternperature, whereby a ribbed steel rod of high elastic limit and high notch impact tenacity is formed.
  • a method of manufacturing ribbed steel rods for reinforcing concrete comprising the steps of cold-rolling a steel rod consisting of Thomas steel andl deforming the same so as to reduce its dimensions in one cross-sectional direction by at least 40%; thereafter tempering said coldrolled deformed steel rod at a temperature ranging between 450 and 600 centigrade for at least 15 minutes, and forming ribs on said steel rod not less than l5 minutes before termination of said tempering, thereby deforming the area connecting said ribs with said steel rod to a degree of between 40% and 60% thus causing recrystallization and relieving of stress in said area, and tempering said cold-rolled deformed steel rod with the ribs thereon for at least l5 minutes at the indicated temperature, whereby a ribbed steel rod of high elastic limit and high notch impact tenacity is formed.
  • a method of manufacturing ribbed steel rods for reinforcing concrete comprising the steps of cold-rollingl a steel rod 'consisting of Thomas steel and deforming thev tween 450 and 600 centigrade forat least 15 minutesf forming str-aight. longitudinalribs-on said steel'rodgand' twisting the so formed 'rod so that-each of said'straight ⁇ f catedtemperature, whereby a ribbed steel rod ofhigh elastic limit and high notch impact tenacity is formed.
  • a method of manufacturing ribbed steel rods for reinforcing concrete comprising the steps of cold-rolling a steel rod consistingv of Thomas steel and deforming the same so as'toreduce its dimensions in one cross-sectional direction by at least 40%; thereafter tempering said coldrolled deformed steel rod at a temperature ranging between 450" and 600 centigrade for at least 15 minutes, forming straight longtudinal ribs on said steel rod; and
  • a method of manufacturing ribbed steel rods for reinforcing concrete comprising the steps of cold-rolling a steel rod consisting of Thomas steel and deforming the same so as to reduce its dimensions in one cross-sectional direction by at least-40%; thereafter tempering said coldrolled deformed steel rod at a temperature ranging between 450 and 600 centigrade for at least 15 minutes, forming straight longitudinal ribs on said steel rod; and twisting the so formed rod so that each of said straight longitudinal ribs is deformed into a helical rib, having a pitch of between two and six times the maximum dimension -of the cross section of said deformed steel rod, not less than 15 minutes before termination of said tempering so that said cold-rolled deformed steel rod with said ribs thereon is ltempered for at least l5 minutes at the indicated temperature, whereby a ribbed steel rod of high elastic limit and high notch impact tenacity is formed.
  • a method of manufacturing ribbed steel rods for reinforcing concrete comprising the steps of cold-rolling a steel rod consisting of Thomas steel and deforming the same so as to reduce its dimensions in one cross-sectional direction by at least 40%; forming straight longitudinal ribs on said steel rod equally spaced from each other in circumferential direction; twisting the so-formed rod so that each'of vsaid straight longitudinal ribs is deformed into'a helical rib the distance of the thus formed helical ribs from each other being about 0.7 times the maximum dimension'of the cross section of said deformed steel rod; and thereafter tempering said steel rod at a temperature ranging between 450 and 600 centigrade for at least 15 minutes, whereby by a ribbed steel rod of high elastic limit and high notch impact tenacity is formed.
  • a method of manufacturing ribbed steel rods for reinforcing concrete comprising the steps of cold-rolling a steel rod consisting of Thomas steel of oblong cross section thereby deforming the same so as to reduce its dimensions in one cross-sectional direction by at least 40% and to. form a circular cross section; thereafter tempering said cold-rolled deformed steel rod at a temperature ranging between 450 and 600 centigrade for at least 15 minutes, and forming ribs on said steel rod not less than l5 minutes before termination of said temperingV so that said cold-rolled deformed steel rod with said ribs thereon is tempered for at least l5 minutes at the indicated temperature, whereby a ribbed steel rod of high elastic limit and high notch impact tenacity is formed.
  • a method of manufacturing ribbed steel rods for reinforcing concrete comprising the steps of cold-rolling a steel rod consistingof Thomas steel and deforming the same so as to reduce-its dimensions in one cross-sectional direction byat least 40%; forming-straight longitudinal' ⁇ ribs onv said steel-rodl equally spaced ⁇ from each other ino circumferential direction; twisting the so-formed rod so that each of said straight longitudinal ribs is deformed into a helical rib, the pitch of said helical ribs being less than 6 times the maximum dimension of the cross section of said deformed steel rod; and thereafter tempering said steel rod at a temperature ranging between 450 and 600 centigrade for at least 15 minutes, whereby a ribbed steel rod of high elastic limit and high notch impact tenacity is formed.
  • a method of manufacturing ribbed steel rods for reinforcing concrete comprising the steps of cold-rolling a steel rod consisting of Thomas steel having an oblong cross section and deforming the same so as to reduce its dimensions in one cross sectional direction by at least 40% and to form a circular cross section; forming straight longitudinal ribs on said steel rod equally spaced from each other in circumferential direction; twisting the soformed rod so that each of said straight longitudinal ribs is deformed into a helical rib, the distance of the thusformed helical ribs from each other being equal to about 0.7 times the diameter of said deformed steel rod and the pitch of said helical ribs being less than 6 times the diameter of said deformed steel rod; and thereafter tempering said steel rod at a temperature ranging between 450 and 600 centigrade for at least 15 minutes, whereby a ribbed steel rod of high elastic limit and high notch impact tenacity is formed.
  • a method of manufacuring ribbed steel rods made of Thomas steel having a nitrogen content of not more than 0.012% for reinforcing concrete comprising the steps of cold-rolling a steel rod consisting of Thomas steel having a nitrogen content of not more than 0.012% and deforming the same so as to reduce its dimensions in one cross-sectional direction by at least 40%; thereafter tempering said cold-rolled deformed steel rod at a tempcrature ranging between 450 and 600 centigrade for at least 15 minutes, and forming ribs on said steel rod not less than 15 minutes before termination of said tempering so that said cold-rolled deformed steel rod with said ribs 10 thereon is tempered for at least 15 minutes at the indicated temperature, whereby a ribbed steel rod of high elastic limit and high notch impact tenacity is formed.
  • a method of manufacuring ribbed steel rods for reinforcing concrete comprising the steps of cold-rolling a steel rod consisting of Thomas steel in two directions normal to each other and deforming the same so as to reduce its dimensions in one cross-sectional direction by at least and to form a rectangular cross-section; thereafter tempering said cold-rolled deformed steel rod at a temperature ranging between 450 and 600 centigrade for at least l5 minutes, and forming ribs on said steel rod not less than 15 minutes before termination of said tempering so that said cold-rolled deformed steel rod with said ribs thereon is tempered for at least 15 minutes at the indicated temperature, whereby a ribbed steel rod of high elastic limit and high notch impact tenacity is formed.
  • a method of manufacturing ribbed steel rods for reinforcing concrete comprising the steps of cold-rolling a steel rod consisting of Thomas steel in two directions normal to each other and deforming the same so as to reduce its dimensions in one cross-sectional direction by at least 40% and to form a rectangular cross-section; thereafter tempering said cold-rolled deformed steel rod at a temperature ranging between 450 and 600 centigrade for at least 15 minutes, and forming transversal ribs on at least two opposite surfaces of said steel rod not less than 15 minutes before termination of said tempering so that said cold-rolled deformed steel rod with said ribs thereon is tempered for at least 15 minutes at the indicated temperature, whereby a ribbed steel rod of high elastic limit and high notch impact tenacity is formed.

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US46760254 1953-11-07 1954-11-08 Method of manufacturing ribbed steel rods Expired - Lifetime US2816052A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE334032X 1953-11-07
DE330477X 1954-01-13
DE230854X 1954-08-23
DE220954X 1954-09-22

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US480620A Expired - Lifetime US2863913A (en) 1953-11-07 1955-01-07 Process for producing terephthalic acid

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FR (1) FR1111878A (xx)
GB (2) GB793305A (xx)
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3102060A (en) * 1958-12-15 1963-08-27 Schoch Ag Ernst Method for the mechanical twisting of cold-formed profile steels
US3196052A (en) * 1953-06-01 1965-07-20 Somerset Wire Company Ltd Prestressing wire and method of manufacturing the same
US3471343A (en) * 1965-05-07 1969-10-07 Max Koehler Process for the production of sinter iron materials
US3888119A (en) * 1974-01-18 1975-06-10 Armco Steel Corp Process for cold-working and stress-relieving non-heat hardenable ferritic stainless steels
US3979186A (en) * 1974-10-25 1976-09-07 Neturen Company Ltd. Steel rod for prestressing concrete
US20120263968A1 (en) * 2009-10-06 2012-10-18 Haeussler Franz Method and Device for Producing Welded Connections
CN103590538A (zh) * 2013-11-07 2014-02-19 于国友 一种混凝土用非圆形筋材
US20150336156A1 (en) * 2011-01-18 2015-11-26 Nucor Corporation Threaded rebar manufacturing process and system
US9267293B1 (en) * 2015-02-13 2016-02-23 Jia-Hao Li Hand railings

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3072717A (en) * 1957-11-29 1963-01-08 Celanese Corp Recovery of isophthalic and terephthalic acids
US3033899A (en) * 1957-12-02 1962-05-08 Standard Oil Co Crystallization of benzene tricarboxylic acids from aqueous solutions
US3023217A (en) * 1958-04-10 1962-02-27 Henkel & Cie Gmbh Process for the introduction of carboxyl groups into aromatic compounds
US3043869A (en) * 1958-06-02 1962-07-10 Sun Oil Co Separation of phthalic acids
US3102906A (en) * 1960-02-04 1963-09-03 Robert F Ruthruff Isomerization of aromatic polycarboxylic acids
US3042717A (en) * 1961-02-15 1962-07-03 Henkel & Cie Gmbh Process for the production of aromatic dicarboxylic and polycarboxylic acids
DE1135446B (de) * 1961-06-08 1962-08-30 Basf Ag Verfahren zur Herstellung von Salzen cyclischer Carbonsaeuren mit aromatischem Charakter durch thermische Umsetzung von Salzen anderer cyclischer Carbonsaeuren aromatischer Natur
US3215735A (en) * 1961-07-06 1965-11-02 Teikoku Jinzo Kenshi Kk Method of treating aqueous solution of alkali salts of aromatic carboxylic acids
CH658074A5 (de) * 1982-10-18 1986-10-15 Moos Stahl Ag Verfahren zur verguetung von walzprodukten, vorrichtung zur durchfuehrung des verfahrens und bewehrungsstab hergestellt nach dem verfahren.
AT389125B (de) * 1982-10-18 1989-10-25 Moos Stahl Ag Verfahren zur verguetung von walzprodukten, vorrichtung zur durchfuehrung des verfahrens und bewehrungsstab hergestellt nach dem verfahren
FR2569424B3 (fr) * 1984-08-23 1986-09-05 Siderurgie Fse Inst Rech Methode de fabrication de produits longs metalliques creneles, notamment en acier, et dispositif de mise en oeuvre
CA1238205A (en) * 1985-04-26 1988-06-21 Cerminco Inc. Structural rod for reinforcing concrete material
DE3518606A1 (de) * 1985-05-23 1986-11-27 Pantex-Stahl AG, Büron Bewehrungsstahl insbesondere fuer spritzbeton
HU204312B (en) * 1985-11-26 1991-12-30 December 4 Drotmuevek Stretching staple for stressed concrete structures

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB644598A (en) * 1939-04-22 1950-10-11 Lasalle Steel Co Improvements in or relating to non-austenitic steel

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB644598A (en) * 1939-04-22 1950-10-11 Lasalle Steel Co Improvements in or relating to non-austenitic steel

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3196052A (en) * 1953-06-01 1965-07-20 Somerset Wire Company Ltd Prestressing wire and method of manufacturing the same
US3102060A (en) * 1958-12-15 1963-08-27 Schoch Ag Ernst Method for the mechanical twisting of cold-formed profile steels
US3471343A (en) * 1965-05-07 1969-10-07 Max Koehler Process for the production of sinter iron materials
US3888119A (en) * 1974-01-18 1975-06-10 Armco Steel Corp Process for cold-working and stress-relieving non-heat hardenable ferritic stainless steels
US3979186A (en) * 1974-10-25 1976-09-07 Neturen Company Ltd. Steel rod for prestressing concrete
JP2013506559A (ja) * 2009-10-06 2013-02-28 ハウスラー．イノバチオーン．ゲゼルシャフト．ミット．ベシュレンクテル．ハフツング 溶接接続部を形成するための方法および装置
US20120263968A1 (en) * 2009-10-06 2012-10-18 Haeussler Franz Method and Device for Producing Welded Connections
AU2010305690B2 (en) * 2009-10-06 2014-06-05 Haussler Innovation Gmbh Method and device for producing welded connections
US9016548B2 (en) * 2009-10-06 2015-04-28 Haussler Innovation Gmbh Method and device for producing welded connections
US20150336156A1 (en) * 2011-01-18 2015-11-26 Nucor Corporation Threaded rebar manufacturing process and system
US9855594B2 (en) * 2011-01-18 2018-01-02 Nucor Corporation Threaded rebar manufacturing process and system
CN103590538A (zh) * 2013-11-07 2014-02-19 于国友 一种混凝土用非圆形筋材
US9267293B1 (en) * 2015-02-13 2016-02-23 Jia-Hao Li Hand railings

Also Published As

Publication number Publication date
FR1111878A (fr) 1956-03-06
LU32956A1 (xx)
GB793305A (en) 1958-04-16
NL193905A (xx) 1900-01-01
CH330477A (de) 1958-06-15
CH334032A (de) 1958-11-15
US2863913A (en) 1958-12-09
NL91771C (xx) 1900-01-01
GB777497A (en) 1957-06-26

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