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BS 6744:2016 - TC Tracked Changes. Stainless steel bars. Reinforcement of concrete. Requirements and test methods, 2020
- Publishing and copyright information
- Publication history
- Amendments issued since publication [Go to Page]
- List of figures
- List of tables
- Summary of pages
- Introduction by Lee Brankley, CEO, CARES
- Foreword [Go to Page]
- Publishing information
- Supersession
- Information about this document
- Use of this document
- Presentational conventions
- Contractual and legal considerations [Go to Page]
- Compliance with a British Standard cannot confer immunity from legal obligations.
- 1 Scope
- 2 Normative references
- 3 Terms, definitions and symbols [Go to Page]
- 3.1 Terms and definitions
- 3.1.1 0.2% proof strength, Rp0.2 [Go to Page]
- Key
- 3.1.2 bar
- 3.1.2 cold worked ribbed bar
- ribbed bar that has been cold worked to meet the property andgeometrical requirements of this British Standard
- 3.1.3 batch
- 3.1.4 bundle
- 3.1.5 cast (heat) analysis
- 3.1.6 characteristic value, Cv
- 3.1.7 characteristic yield strength, fyk
- 3.1.8 coil
- 3.1.9 cold worked ribbed stainless reinforcing steel bar
- 3.1.10 critical chloride threshold value
- 3.1.11 decoiled product
- 3.1.3 hot rolled ribbed bar
- 3.1. 12 hot rolled ribbed stainless reinforcing steel bar [Go to Page]
- 3.1.4 nominal diameter, d
- 3.1.13 length
- 3.1.14 longitudinal rib
- 3.1.15 manufacturer
- 3.1.16 maximum value
- 3.1.17 minimum value
- 3.1.18 nominal cross-sectional area, An
- 3.1.19 nominal diameter, d
- 3.1.53.1.20 coil product analysis
- 3.1.7 bundle [Go to Page]
- 3.1.21 purchaser
- 3.1.22 reinforcing steel
- 3.1.23 reinforcing steel designation [Go to Page]
- 3.1.24 reinforcing steel grade
- 3.1.9
- 3.1.10 transverse rib
- 3.1.113.1. 26 rib height, aαmax [Go to Page]
- 3.1.133.1.28 relative rib area, fR stress ratio, σf
- area of the projections of all ribs on a plane perpendicular to the longitudinal axis of the wire, or bar, or rod, divided by the wire length and the nominal circumference
- 3.1.1929 supplier [Go to Page]
- 3.1.203.1.30 purchasertransverse rib
- 3.1.21 0.2 % proof strength, Rp0.2
- 3.1.14
- 3.1.15
- transverse rib flank inclination, !
- angle between the rib flank and the longitudinal axis of the bar (see Figure C.2)
- 3.1.16 cast (heat) analysis
- 3.1.17 product analysis
- 3.1.18 manufacturer
- 3.1.22 characteristic strength [Go to Page]
- 3.1.31 transverse rib flank inclination, α
- 3.1.32 transverse rib inclination, β [Go to Page]
- Figure 2 Typical stress-strain curve (relation) for stainless reinforcing
- 4 Designation [Go to Page]
- EXAMPLE
- 5 Standard sizesdiameters
- 6 Dimensions, mass and tolerances [Go to Page]
- 6.1 EffectiveNominal cross-sectional area and mass per metre run [Go to Page]
- Table 3 — Nominal cross-sectional area of reinforcing steel and nominal mass per metre run
- Table 4 — Tolerances on mass per metre run [Go to Page]
- Table 4 — Tolerances on mass per metre run
- Table 4 Tolerances on mass per metre run
- 7 Steelmaking process
- 8 Chemical composition [Go to Page]
- 8.1 Cast analysis [Go to Page]
- Table 5 — Stainless steel bar chemical composition (cast analysis) % by mass
- 8.2 Product analysis
- 9 Surface quality
- 10 Surface geometry [Go to Page]
- 10.1 General [Go to Page]
- Table 5 Chemical composition (cast analysis)% by mass of typical, commercially available BS EN 10088 stainless reinforcing steel designationsA)
- 10.2 Relative rib area
- 10.3 Geometry of rib [Go to Page]
- 10.3.1 General
- 10.3.2 Transverse ribs
- 11 Conditions of supply
- 12 Mechanical and physical properties [Go to Page]
- 12.1 Selection of test samples for conformity testing
- 12.2 Test reports
- 12.3 Test certificate
- 12.4 Retests
- 12.5 Tensile properties [Go to Page]
- 12.5.1 0.2% proof strength, Rp0.2
- 12.5.2 Tensile strength, Rm
- 12.5.3 Stress ratio, σf
- 12.5.4 Elongation at maximum force
- 12.5.5 Percentage elongation after fracture, A5 [Go to Page]
- 12.1 Tensile properties
- Table 8 Strength and ductility properties
- 12.2 Total elongation at maximum force, Agt
- 12.6 Bendability
- 12.7 Bonding strength (surface geometry)
- 12.4 12. 8 Fatigue testcharacteristics
- 12.9 Strength at elevated temperature (tensile strength)
- 12.10 Chemical composition and durability
- 12.11 Weldability
- 12.512.12 Additional test requirements [Go to Page]
- 12.5.112.12.1 General
- 12.5.212.12.2 Charpy impact test
- 12.5.312.12.3 Intergranular corrosion test
- Retests
- 1413 Product identification [Go to Page]
- 14.113.1 Product marking
- 14.213.2 Product labelling [Go to Page]
- Annex A
- (normative)
- A.1 Uniform cross-sectional area
- A.2 Variable cross-sectional area
- Annex B(informative) [Go to Page]
- Table B.1 — Guidance on the use of stainless steel reinforcement for different service conditions
- C.2 Test procedure (see Figure C.1 and Figure C.2) [Go to Page]
- C.2.1 Heights of transverse ribs
- C.2.2 Height of longitudinal ribs, a´
- C.2.3 Transverse rib or indentation spacing, c
- C.2.4 Pitch, P
- C.2.5 Transverse ribless perimeter, Cfi
- C.2.6 Transverse rib angle,
- C.2.7 Transverse rib flank inclination, !
- C.3 Determination of the relative rib area, fR [Go to Page]
- C.3.1 General
- C.3.2 Calculation of fR (see Figure C.3)
- C.3.3 Simplified formulae
- C.3.4 Formula used for the calculation of fR [Go to Page]
- Key
- Figure C.2 — Rib flank inclination, !, and rib height, a (section A-A from Figure C.1)
- Figure C.3 — Determining the area of the longitudinal section of a rib
- A.1 Principle
- A.2 Materials [Go to Page]
- A.2.1 Ribbed stainless reinforcing steel
- A.2.2 Mortar
- A.2.3 Specimens [Go to Page]
- Key
- A .2.4 Test procedure
- A.2.5 Test results
- A.2.6 Test report [Go to Page]
- (informative) D.1.1 Manufacturer's inspection B.1 General
- D.1.2 Selection of test samples
- D.1.3 Condition of test samples
- D.1.4 Tensile test
- D.1.5 Test records
- D.1.6 Test certificate
- B.2 Terminology
- B.3 Prescriptive guidance
- B.4 Performance guidance [Go to Page]
- B.4.1 General
- B.4.2 Performance guidance for carbonation induced corrosion.
- B.4.3 Performance guidance for chloride-induced corrosion
- B.4.4 Performance guidance for chloride induced corrosion in carbonated concrete [Go to Page]
- Figure B.1 Example predictive model indicating where carbon steel reinforcement can be replaced by stainless steel reinforcement for a given chloride surface content, design life and reinforcement depth
- B.5 Adaptations and limitations
- Annex E (normative)
- Bend test [Go to Page]
- Table F.1 — Fatigue test stress ranges
- F.3 Test procedure
- F.4 Retests
- Table G.1 — Comparison between the designation systems used in current and former British Standards and American steel specifications [Go to Page]
- Annex I (informative)
- Third party certification
- I.1 Material covered by a third party product certification schemeI
- I.1.2.1 Extent of testing
- I.1.2.2 Evaluation [Go to Page]
- Annex D [Go to Page]
- Table D.1 Comparative thermal coefficient of expansion data
- Figure E.1 Idealized design curve from BS EN 1992-1-1:2004+A1:2014
- Table E.1 Young’s modulus for stainless reinforcing steel
- Figure E.2 The constitutive law of stainless reinforcing steel
- E.2 Steps for using the full properties of higher strength and ductility of stainless reinforcing steel [Go to Page]
- Figure E.3 Example of design model for stainless reinforcing steel
- F.2 Duplex stainless reinforcing steel
- F.3 Welding stainless reinforcing steels to carbon steels
- F.4 Handling and processing [Go to Page]
- (normative) For N values for performance retention at elevated temperatures the relevant designation shall be selected from BS EN 1993-1-2:2005, Table C.1.
- H.1.2.1 Extent of testing
- H.1.2.2 Evaluation [Go to Page]
- Table H.1 Acceptability number of test results, n, for a reliable failure rate of 5% (pass = 0.95) at a probability of 90% (1 – α = 0.90)
- I.2.2H.2.2 Extent of sampling and testing
- I.2.3H.2.3 Properties to be tested
- c) Chemical composition according to product analysis:
- d) Fatigue properties:
- I.2.4H.2.4 Evaluation of results [Go to Page]
- I .2.4.2H.2.4.2 Inspection by attributes
- H.3 Corrosion testing [Go to Page]
- Annex JI (informative)
- Table J.1 — Comparative thermal coefficient of expansion data
- Bibliography [Go to Page]
- Standards publications
- Other publications
- 30320588Tracked_Changes_Cover_Markup_new.pdf [Go to Page]
- compares BS 6744:2016 [Go to Page]
- TRACKED CHANGES
- Text example 1 — indicates added text (in green) [Go to Page]
