British Standard 4449 Pdf

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Thisstandard defines three grades of reinforcement conforming to the now withdrawn BS EN 10080: B500A, B500B and B500C. The characteristic yield strength is set at 500 MPa and the tensile properties and ductility of the three grades are described in Table 1.

The 2020 revision of this code involved restructuring and general updating of the 2005 edition. The 2005 edition was produced in order to conform to the anticipated implementation of EN 10080, and incorporated:

Weldable steel for the reinforcement of concrete has become subject to the European Standard, BS EN 10080. In 2008 it had to be withdrawn as a harmonized standard because some countries legal requirements for additional properties of reinforcement were not met. However, it was implemented in the UK in late 2005 and its subsequent withdrawal has no effect on BS 4449 etc.

It contains an informative Annex ZA, which describes how the standard may be used for the purposes of CE marking. Please note that the CE mark is not a quality mark. It merely identifies the product as conforming to the essential requirement laid down by the European Commission in their 'mandate' to CEN. CE marking is not a requirement of BS 4449:2005 and reinforcement cannot be CE marked as the harmonized standard has been withdrawn.

This standard incorporates plain, indented and ribbed wire, coiled or decoiled. Grade 250 has been incorporated. The characteristic strength of the high yield steel has been set at 500 MPa and the ductility aligned with B500A in BS 4449:2005, but no fatigue performance is specified.

Apart from wrapping fabrics D49 and D98, fabric will be made from and evaluated as BS 4449:2005 material. A requirement for the strength of welded joints in BS EN 1992-1-1 has necessitated the withdrawal of A98 and B196 and has increased the diameter of transverse bars in some other designated fabric types.

This British Standard specifies requirements for preferred sizes of smooth or ribbed alloy steel bars in straight lengths supplied in the hot rolled or hot rolled and processed conditions. It can be used while prEN 10138 standards are in preparation.

The Concrete Centre provides material, design and construction guidance. Our aim is to enable all those involved in the design, use and performance of concrete and masonry to realise the potential of these materials.

This paper discusses the revised British Standard BS 4449:1997 for reinforcing steel, and the forthcoming European Standard ENV 10080. BS 4449:1997 contains several changes, which were introduced in the European Pre-standards ENV 10080, agreed in 1995. One of the main changes to the previous (1988) version of BS 4449, introduced in BS 4449:1997, is the introduction of ductility classes for Grade 460 with different criteria. The application of the characteristic value approach for yield strength has been altered; the definition from ENV 10080 now refers to the long-term quality level of production. The bend test has been removed, because it is not required in many European specifications and is not included in ENV 10080. The rebend test has been retained. The definition of yield strength and the criteria for verifying mechanical properties have both been altered. The formal negotiations to produce EN 10080 were due to begin in May 1997, although informal discussions have been continuing since the agreement of ENV 10080. Although some of the issues are non-controversial, there are considerable difficulties on other issues, such as fatigue, which could be hard to resolve.

BS 4449 is intended for manufacturers, fabricators and purchasers of ribbed reinforcing steel (bars, coils and decoiled products) for the reinforcement of concrete structures. It provides designations based on the grade of steel, the product form and dimensions. The standard is used to specify all normal technical requirements for reinforcing steels, including chemical analysis, mechanical properties, rib geometry and tolerances on dimensions.

This British Standard specifies requirements for ribbed weldable reinforcing steel used for the reinforcement of concrete structures. The standard covers steel delivered in the form of bars, coils and decoiled products. The standard contains provisions for three steel grades, all of 500MPa characteristic yield strength, but with different ductility characteristics. The three grades are B500A, B500B and B500C.

NOTE Flash welds in lengths of bar are permissible under this standard, provided all the mechanical requirements are met. However, for some purposes, purchasers might specifically require bars without flash welds, and if so this ought to be stated at the time of enquiry and/or order.

500B is in the British standard BS 4449-2005 .The grade 500B covers steel delivered in the form of bars,coils products.The standard BS 4449-2005 contains provisions for three steel grades ,all of 500MPa characteristics yield strength ,but with different ductility characteristics.The three grades are B500A,B500B,B500C .

BS 4449-2005 500B Weldable reinforcing steel for the reinforcement of concrete application :

This British grade 500B specifies requirements for ribbed weldable reinforcing steel used for the reinforcement of concrete structures.

A total of more than 500,000 tons of steel grades B500B and 500B have been exported by Hoa Phat Dung Quat since the beginning of the year. This accounts for 45% of Hoa Phat Steel's export volume in the past 11 months. This high-quality steel grade has been certified by UKCares to British standards BS4449 and CS2:2012.

Soon after obtaining the UKCares certification, steel bar grades B500B and 500B attracted the interest of many partners. Some months, export orders reached nearly 100,000 tons. The 500B grade with the CS2 standard provided for the Hong Kong market, and the B500B grade with the SS560 standard is exported to the Singapore market.

Therefore, UK Cares can be considered a "passport" for Hoa Phat steel to enter the UK and other fastidious markets. Besides, Hoa Phat construction steel has been certified in accordance with many rigorous standards of the world such as JIS (Japan), ASTM (USA), and BS (UK), ...

In the past 11 months, Hoa Phat Group has exported 1.1 million tons of construction steel (including high-quality steel bars and wire rod) to many different countries and territories such as Japan, Korea, Malaysia, Singapore, Hong Kong, USA, Canada, etc. A total of 45% of the export volume was accounted for UK Cares standard steel.

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The British Standards Institute (BSI) published this new standard in January 2017. There has recently been a significant growth in the specification of pre-assembled welded fabrications. This standard aims to clarify the requirements of BS EN ISO 17660-1 and BS EN ISO 17660-2, providing suitable guidance for the arc welding of carbon steel reinforcing bars produced in accordance with BS 4449 and BS 4482.

This standard gives general guidance for the satisfactory production and control of the welding of steel reinforcement in accordance with the requirements of BS EN 1011-2, BS EN ISO 17660-1 and BS EN ISO 17660-2. In order to aid the specifier and manufacturer using these standards, additional informative guidance has been added, especially regarding the steps to be taken to avoid hydrogen cracking.

The procedures and test requirements contained in this standard apply to the assessment of the weld, and its potential effect on the welded reinforcement, but do not take into account design criteria, e.g. fatigue, that are the responsibility of the relevant application standard.

Reinforcing steel bars manufactured in accordance with the requirements of BS 4449 and BS 4482 are produced by a number of differing process routes, typically quenched and self-tempered, cold reduced and to a lesser extent micro-alloyed steel. In addition, the profile of the reinforcement bar is ribbed and as such the welding of steel reinforcement requires a specific level of skill and job knowledge, both for the welder and the organisation exercising control over the whole process, from purchasing of the steel to the eventual supply of the prefabricated item to the customer.

Whilst the specific requirements for the welding of steel reinforcement are set out in BS EN ISO 17660-1 and BS EN ISO 17660-2, this standard gives general guidance for the satisfactory production and control of welding. It also details possible detrimental phenomena which might occur, with advice on how these can be avoided.

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