Focus on Reval reinforcing bar

Reval Cut and BentReval is the trade mark for the three most popular stainless steel grades of reinforcement bar manufactured by Acciaierie Valbruna S.p.A, these being:

  • 1.4162 (Lean Duplex)
  • 1.4301 (304 S31)
  • 1.4362 (Lean Duplex)
  • 1.4436 (316 S33)
  • 1.4462 Duplex

The quality of the reinforcing bar produced under the Reval trade mark is a result of a very close co-operation between Acciaierie Valbruna and the European Academic world devoted to the problems of concrete structure durability within aggressive corrosion environments.

Reval® - Material Grades and Standards

European Standard: EN 10088-3.1995
British Standard: BS 6744:2001 A2:2009

Valbruna StandardEuropean StandardBritish StandardStainless Steel TypeAvailability
  1.4162   Lean Duplex On Request
Reval 30 1.4301 304 S31 Austenitic Stock U.K. & Italy
  1.4362   Lean Duplex Stock U.K. & Italy
Reval 31 1.4436 316 S33 Austenitic Stock U.K. & Italy
Reval 32 1.4462 318 S13 Duplex On Request

 

Stainless Steel Material Grade Selection

Service ConditionMaterial Grade
For structures or components with either a long design life, or which are inaccessible to future maintenance.  1.4301 (304 S31)
For structures or components exposed to chloride contamination with no relaxation in durability design.  1.4301 (304 S31)
Reinforcement Bridging Joints, or penetrating the concrete surface and also subject to chloride contamination.  1.4436 (316 S33)
Structures subject to chloride contamination where reductions in normal durability requirements are proposed.  1.4436 (316 S33)

 

Reval® - Material Strength and Properties

Reval Reinforcement Bar conforms to BS 6744:2001

0.2% Proof Strength (N/mm² minimum) 500
Ultimate Tensile Strength (N/mm² minimum) 550
Elongation 14%


A high proof Reval is available on certain diametes in all three grades of stainlesss steel with a 0.2% proof strength of 650 N/mm².  This material is available on request.

 

Reval® Properties

Dia mm6810121620253240
Area mm² 28.3 50.3 78.5 113.1 201.1 314.2 490.9 804.2 1256.6
Mass kg/m 0.234 0.409 0.639 0.920 1.625 2.538 3.965 6.500 10.150

 

Reval® - Stock and Cut Lengths

Stock Lengths 6000mm - 6400mm random lengths   Shape Codes to BS 8666: 2005
Cut Lengths Any combination from stock lengths   or BS 4466: 1986


Reval can be supplied up to 11.800mm long to order.

UK Cares Certificate 030802
Clients can specify UK CARES approved products such as Reval Stainless Steel reinforcing bar with confidence, as they will always comply with the relevant UK and European Standards.

Reval® - Magnetic properties of stainless steel

Ferritic, martensitic, duplex and the standard precipitation hardening stainless steels are usually referred to as “magnetic” in that a normal magnet will stick to them. Austenitic stainless steel in the annealed condition is non-magnetic. However if an austenitic grade is on the lean side, i.e. has a low range of nickel, or if it has been cold worked, it can become sufficiently magnetic for a normal sized magnet to stick to it. In particular small diameter bars that have been bright drawn can exhibit a strong pull on a magnet.

Magnetism can vary in a bar, with the thread of a thread rolled bar being magnetic but the still smooth shaft being non-magnetic. If bars are bent to a high degree, the bend area can become magnetic.

If non-magnetism is crucial, for example reinforcing bar in concrete for particular applications, this must be established at the enquiry stage. A general figure for the grade can then be given, or a sample can be checked by a UKAS approved test house to establish its relative magnetic permeability.

PREN – Pitting Resistance Equivalency Number

Pitting resistance equivalent numbers (PREN) are a theoretical way of comparing the pitting corrosion resistance of various types of stainless steels, based on their chemical compositions.

The PREN (or PRE) numbers are useful for ranking and comparing the different grades, but cannot be used to predict whether a particular grade will be suitable for a given application, where pitting corrosion may be a hazard.

Actual or specified range compositions can be used and usually involve chromium, molybdenum and nitrogen in the calculations.

Grade

Type

Cr
Min

CR
Max

Mo
Min

Mo
Max

N
Min

N
Max

PREN
Min

PREN
Max

1.4301

Austenitic 304S31

17.5

19.5

 

 

 

0.11

17.5

21.3

1.4362

Lean Duplex

22

24

0.1

0.6

0.05

0.2

23.1

29.2

1.4401/4

Austenitic 316/316L

16.5

18.5

2.0

2.5

 

0.11

23.1

28.5

1.4436

Austenitic 316S33

16.5

18.5

2.5

3.0

 

0.11

24.8

30.2

1.4429

316LN

16.5

18.5

2.5

3.0

0.12

0.22

26.7

31.9

1.4462

Duplex F51

21

23

2.5

3.5

0.1

0.22

30.9

38.1