Foreword

Publishing information

This British Standard is published by BSI Standards Limited, under licence from The British Standards Institution, and came into effect on 28 February 2023. It was prepared by Technical Committee ISE/104, Concrete Reinforcing and Pre‑Stressing Steels. A list of organizations represented on this committee can be obtained on request to the committee manager.

Supersession

This British Standard supersedes BS 6744:2016, which is withdrawn.

Information about this document

This new edition of BS 6744 incorporates technical changes only. It does not represent a full review or revision of the document, which will be undertaken in due course. The changes have been made to correct errors and omissions, particularly those relating to the lack of instruction relating to the procedure required if a test fails.

Attention is drawn to the fact that compliance with this document might involve the use of patents applied to steel designation 1.4162 (see 3.1.24). The patent holder agrees to make the material available for production of stainless reinforcing steel bars on reasonable and accessible and non‑discriminatory terms. Information on designation 1.4162 may be obtained from: Outokumpu Stainless Ltd, Europa Link, Sheffield, South Yorkshire S9 1TZ.

This standard was revised so that it can be used in conjunction with BS 8666, Scheduling, dimensioning, bending and cutting of steel reinforcement for concrete – Specification, but also to take into account the requirements of Eurocode (EC) 2 (specifically BS EN 1992‑1‑1 and BS EN 1992‑1‑2) and the Construction Products Regulations (CPR) [1] with respect to constitutive relationship and durability. It has also been revised to act as the national application standard for BS EN 104031, Steel for the reinforcement of concrete – Stainless steels (in preparation).

The decision was taken to remove other uses of steel in concrete, which means that plain bars and grades 200 MPa and ribbed bars above grade 500 MPa are no longer covered by this standard. These products are covered by other standards. This is with the exception of 500 MPa bar and 650 MPa ribbed bar which are now in an informative Annex (Annex I). The standard is open to other strength grades of ribbed bar on the basis that the designers know that these are outside normal UK practice and, once over 600 MPa, outside EC2.

Informative annexes have been prepared to give guidance on durability, magnetic properties, coefficients of thermal expansion, constitutive relationship, welding, performance at elevated temperatures and quality assurance. As far as is possible, the revision has been written to reflect the requirements of BS 4449.

The test method in Annex A is based on the method in BS EN 480‑14 adapted by Schönning, Randström and Adair for determining a critical chloride threshold level for stainless steel rebar [2] and that in Testing for chloride threshold levels of stainless reinforcing bar [3].

Copyright is claimed on Figure B.1. Copyright holders are Ove Arup & Partners Ltd, 13 Fitzroy Street, London W1T 4BQ.

Product certification. Users of this British Standard are advised to consider the desirability of third‑party certification of product conformity to this British Standard. Appropriate conformity attestation arrangements are described in BS EN ISO/IEC 17065. Users seeking assistance in identifying appropriate conformity assessment bodies or schemes may ask BSI to forward their enquiries to the relevant association.

This publication can be withdrawn, revised, partially superseded or superseded. Information regarding the status of this publication can be found in the Standards Catalogue on the BSI website at bsigroup.com/standards, or by contacting the Customer Services team.

Where websites and webpages have been cited, they are provided for ease of reference and are correct at the time of publication. The location of a webpage or website, or its contents, cannot be guaranteed.

Use of this document

It has been assumed in the preparation of this British Standard that the execution of its provisions will be entrusted to appropriately qualified and experienced people, for whose use it has been produced.

Presentational conventions

Where words have alternative spellings, the preferred spelling of the Shorter Oxford English Dictionary is used (e.g. “organization” rather than “organisation”).

Contractual and legal considerations

This publication has been prepared in good faith, however no representation, warranty, assurance or undertaking (express or implied) is or will be made, and no responsibility or liability is or will be accepted by BSI in relation to the adequacy, accuracy, completeness or reasonableness of this publication. All and any such responsibility and liability is expressly disclaimed to the full extent permitted by the law.

This publication is provided as is, and is to be used at the recipient’s own risk.

The recipient is advised to consider seeking professional guidance with respect to its use of this publication.

This publication is not intended to constitute a contract. Users are responsible for its correct application.

Compliance with a British Standard cannot confer immunity from legal obligations.

BS 6744:2023

Stainless steel bars. Reinforcement of concrete. Requirements and test methods

Current

Published:

31 Jan 2023