GB1581147A - Steel for reinforcement - Google Patents

Steel for reinforcement Download PDF

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Publication number
GB1581147A
GB1581147A GB25694/77A GB2569477A GB1581147A GB 1581147 A GB1581147 A GB 1581147A GB 25694/77 A GB25694/77 A GB 25694/77A GB 2569477 A GB2569477 A GB 2569477A GB 1581147 A GB1581147 A GB 1581147A
Authority
GB
United Kingdom
Prior art keywords
bar
rod
content
steel
vanadium
Prior art date
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.)
Expired
Application number
GB25694/77A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Steel Corp
Original Assignee
British Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by British Steel Corp filed Critical British Steel Corp
Priority to GB25694/77A priority Critical patent/GB1581147A/en
Priority to BE188601A priority patent/BE868157A/en
Priority to ES470856A priority patent/ES470856A1/en
Priority to NL7806531A priority patent/NL7806531A/en
Priority to NO782124A priority patent/NO782124L/en
Priority to SE7806988A priority patent/SE7806988L/en
Priority to IT68421/78A priority patent/IT1107915B/en
Priority to LU79839A priority patent/LU79839A1/en
Priority to DE19782826823 priority patent/DE2826823A1/en
Priority to JP7478678A priority patent/JPS5435113A/en
Priority to FR7818429A priority patent/FR2395322A1/en
Publication of GB1581147A publication Critical patent/GB1581147A/en
Expired legal-status Critical Current

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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

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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)
  • Metal Rolling (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Description

(54) STEEL FOR REINFORCEMENT (71) We, BRITISH STEEL COR PORATION, a Corporation incorporated and existing under the Iron and Steel Act 1967 whose principal office is at 33 Grosvenor Place, London, S.W.1 do hereby declare the invention for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: - This invention relates to steel for reinforcement. In particular it is concerned with a weldable reinforcing bar or rod which has been formed by hot rolling.
The steel has a high yield strength and the relatively low quantity of silicon in the steel enables a high prime product yield to be achieved when the steel is being manufactured. Furthermore, the steel can be produced in a basic oxygen furnace and subsequently continuously cast without excessive casting problems due to the combination of silicon and aluminium utilised.
According to one aspect of the invention a weldable reinforcing bar or rod which has been formed by hot rolling, consists of a steel containing between 0.15% and 0.27% carbon, between 1.10% and 1.50% manganese, between 0% and 0.14% silicon, between 0.003% and 0.02% nitrogen, between 0.05% and 0.20% vanadium, between 0% and 0.05 O aluminium, less than 0.05% phosphorus, and less than 0.05% sulphur, the remainder being iron and unavoidable impurities, the steel having a minimum yield strength of 400 Newtons/mm2.
Accordng to a further aspect of the invention a weldable reinforcing bar or rod, which has been formed by hot rolling, contains all the elements specified in the preceding paragraph in the ranges mentioned, and in addition has a niobium content of between 0% and 0.04, the remainder being iron and unavoidable impurities, and the steel having a minimum yield strength of 400 Newtons/mm2.
The vanadium content may be of a narrower range, namely, 0.050/O to 0.15%.
The carbon content of the steel may be in the range of 0.16% to 0.22%.
The manganese content of the steel may be in the range 1.10% to 1.50%.
The silicon content may be in the range 0.02% to 0.12%.
Nitrogen may be in the range 0.010% to 0.016%.
The vanadium content may be further restricted to the range 0.05% to 0.09%.
The bar or rod may have a plain surface or alternatively it may be rolled with ribs.
The steel which is rolled to form the bar or rod may be produced by the continuous casting method. Alternatively, the steel may be cast in ingot form prior to rolling. The hot rolled bar or rod is preferably allowed to cool substantially only in air.
Examples of typical compositions of steels according to the invention together with their respective yield strengths and tensile strengths are given in the following table.
TYPICAL COMPOSITIONS
Bar Size (mm) C Mn Si V N Nb YS* TS* 16 .19 1.38 .011 .072 .0 14 - 515 631 16 .21 1.28 .017 .08 .015 - 500 620 16 .20 1.25 .07 .06 .013 - 495 620 25 .22 1.25 .11 .07 .012 - 501 640 25 .20 1.30 .05 .06 .011 - 470 630 40 .17 1.33 .022 .071 .0 - 495 675 40 .16 1.30 .10 .06 .011 - 490 670 40 .20 1.40 .06 .08 .015 - 515 675 25 .20 1.20 .05 .08 .010 .0-15 495 670 25 .18 1.25 .06 .09 .008 .030 510 695 32 .17 1.30 .02 .18 .015 - 550 760 * Yield strength and tensile strength measured in Newtons/mm2.
The above steels are suitably made in a basic oxygen furnace and continuously cast into billets. Additions of vanadium or niobium are typically made in the ladle. The nitrogen content of the steel may also be adjusted by additions of nitrogen-containing compounds to the steel in the ladle. These billets are subsequently hot rolled in a continuous rolling mill, the resulting bar being cooled by air only on its exit from the finishing stand of the mill.
WHAT WE CLAIM IS:- 1. A weldable reinforcing bar or rod which has been formed by hot rolling, consisting of a steel containing between 0.15% and 0.27% carbon, between 1.10% and 1.50% manganese, between 0% and 0.14% silicon, between 0.003% and 0.02% nitrogen, between 0.05% and 0.20% vanadium, between 0% and 0.05% aluminium, less than 0.05% phosphorus, and less than 0.05% sulphur, the remainder being iron and unavoidable impurities, the steel having a minimum yield strength of 400 Newtons/mm2.
2. A weldable reinforcing bar or rod, which has been formed by hot rolling, containing all the elements claimed in the ranges speri- fied in claim 1, further having a niobium content of between 0% and 0.04%, the remainder being iron and unavoidable impurities and the steel having a minimum yield strength of 400 Newtons/mm2.
3. A bar or rod as claimed in claim 1 or 2 in which the vanadium content is from 0.05 /O to 0.15%.
4. A bar or rod as claimed in any tre- ceding claim having carbon content from 0.16% to 0.22%.
5. A bar or rod as claimed in any preceding claim having a manganese content from 1.10% ro 1.500/n.
6. A bar or rod as claimed in any preceding claim in which the silicon content is between 0.01% and 0.12%.
7. A bar or rod as claimed in claim 6 in which the silicon content is between 0.02% and 0.12%.
8. A bar or rod as claimed in any preceding claim in which the nitrogen content is between 0.010% and 0.016%.
9. A bar or rod as claimed in any preceding claim in which the vanadium content is between 0.05% and 0.09%.
10. A bar or rod as claimed in any preceding claim having a ribbed surface.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (12)

**WARNING** start of CLMS field may overlap end of DESC **. TYPICAL COMPOSITIONS Bar Size (mm) C Mn Si V N Nb YS* TS* 16 .19 1.38 .011 .072 .0 14 - 515 631 16 .21 1.28 .017 .08 .015 - 500 620 16 .20 1.25 .07 .06 .013 - 495 620 25 .22 1.25 .11 .07 .012 - 501 640 25 .20 1.30 .05 .06 .011 - 470 630 40 .17 1.33 .022 .071 .0 - 495 675 40 .16 1.30 .10 .06 .011 - 490 670 40 .20 1.40 .06 .08 .015 - 515 675 25 .20 1.20 .05 .08 .010 .0-15 495 670 25 .18 1.25 .06 .09 .008 .030 510 695 32 .17 1.30 .02 .18 .015 - 550 760 * Yield strength and tensile strength measured in Newtons/mm2. The above steels are suitably made in a basic oxygen furnace and continuously cast into billets. Additions of vanadium or niobium are typically made in the ladle. The nitrogen content of the steel may also be adjusted by additions of nitrogen-containing compounds to the steel in the ladle. These billets are subsequently hot rolled in a continuous rolling mill, the resulting bar being cooled by air only on its exit from the finishing stand of the mill. WHAT WE CLAIM IS:-
1. A weldable reinforcing bar or rod which has been formed by hot rolling, consisting of a steel containing between 0.15% and 0.27% carbon, between 1.10% and 1.50% manganese, between 0% and 0.14% silicon, between 0.003% and 0.02% nitrogen, between 0.05% and 0.20% vanadium, between 0% and 0.05% aluminium, less than 0.05% phosphorus, and less than 0.05% sulphur, the remainder being iron and unavoidable impurities, the steel having a minimum yield strength of 400 Newtons/mm2.
2. A weldable reinforcing bar or rod, which has been formed by hot rolling, containing all the elements claimed in the ranges speri- fied in claim 1, further having a niobium content of between 0% and 0.04%, the remainder being iron and unavoidable impurities and the steel having a minimum yield strength of 400 Newtons/mm2.
3. A bar or rod as claimed in claim 1 or 2 in which the vanadium content is from 0.05 /O to 0.15%.
4. A bar or rod as claimed in any tre- ceding claim having carbon content from 0.16% to 0.22%.
5. A bar or rod as claimed in any preceding claim having a manganese content from 1.10% ro 1.500/n.
6. A bar or rod as claimed in any preceding claim in which the silicon content is between 0.01% and 0.12%.
7. A bar or rod as claimed in claim 6 in which the silicon content is between 0.02% and 0.12%.
8. A bar or rod as claimed in any preceding claim in which the nitrogen content is between 0.010% and 0.016%.
9. A bar or rod as claimed in any preceding claim in which the vanadium content is between 0.05% and 0.09%.
10. A bar or rod as claimed in any preceding claim having a ribbed surface.
11. A bar or rod as claimed in any pre
ceding claim which, following hot rolling, has been allowed to cool substantially only in air.
12. A weldable reinforcing bar or rod substantially hereinbefore described with reference to the examples given.
GB25694/77A 1977-06-20 1977-06-20 Steel for reinforcement Expired GB1581147A (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
GB25694/77A GB1581147A (en) 1977-06-20 1977-06-20 Steel for reinforcement
BE188601A BE868157A (en) 1977-06-20 1978-06-15 STEEL FOR REINFORCING BARS
ES470856A ES470856A1 (en) 1977-06-20 1978-06-16 Steel for reinforcement
NL7806531A NL7806531A (en) 1977-06-20 1978-06-16 WELDABLE REINFORCING ROD OR BEAM AND METHOD OF MANUFACTURING A ROD OR BEAM.
NO782124A NO782124L (en) 1977-06-20 1978-06-19 REINFORCEMENT STEEL.
SE7806988A SE7806988L (en) 1977-06-20 1978-06-19 WELDABLE REINFORCEMENT ROD
IT68421/78A IT1107915B (en) 1977-06-20 1978-06-19 ARM STEEL BAR OR BAR
LU79839A LU79839A1 (en) 1977-06-20 1978-06-19 STEEL MANUFACTURING PROCESS FOR REINFORCEMENTS
DE19782826823 DE2826823A1 (en) 1977-06-20 1978-06-19 WELDABLE REINFORCEMENT ROD
JP7478678A JPS5435113A (en) 1977-06-20 1978-06-20 Reinforcing steel
FR7818429A FR2395322A1 (en) 1977-06-20 1978-06-20 REINFORCING STEEL

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB25694/77A GB1581147A (en) 1977-06-20 1977-06-20 Steel for reinforcement

Publications (1)

Publication Number Publication Date
GB1581147A true GB1581147A (en) 1980-12-10

Family

ID=10231790

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25694/77A Expired GB1581147A (en) 1977-06-20 1977-06-20 Steel for reinforcement

Country Status (11)

Country Link
JP (1) JPS5435113A (en)
BE (1) BE868157A (en)
DE (1) DE2826823A1 (en)
ES (1) ES470856A1 (en)
FR (1) FR2395322A1 (en)
GB (1) GB1581147A (en)
IT (1) IT1107915B (en)
LU (1) LU79839A1 (en)
NL (1) NL7806531A (en)
NO (1) NO782124L (en)
SE (1) SE7806988L (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2388845A (en) * 2002-05-23 2003-11-26 Corus Uk Ltd Fire resistant steel

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6092447A (en) * 1983-10-27 1985-05-24 Sumitomo Metal Ind Ltd Iron reinforcing rod for concrete with superior corrosion resistance
JPS61210153A (en) * 1985-03-14 1986-09-18 Kokukou Seiko Kk Unrefined steel composition having superior mechanical property
CN109097690B (en) * 2018-09-14 2020-09-01 柳州钢铁股份有限公司 Production method of HRB400 steel bar for high-speed railway

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2388845A (en) * 2002-05-23 2003-11-26 Corus Uk Ltd Fire resistant steel

Also Published As

Publication number Publication date
NO782124L (en) 1978-12-21
JPS5435113A (en) 1979-03-15
SE7806988L (en) 1978-12-21
DE2826823A1 (en) 1979-01-04
IT1107915B (en) 1985-12-02
FR2395322A1 (en) 1979-01-19
BE868157A (en) 1978-10-02
LU79839A1 (en) 1978-12-07
NL7806531A (en) 1978-12-22
ES470856A1 (en) 1979-02-01
IT7868421A0 (en) 1978-06-19

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee