Hard Wearing Steel Plate - RAEX 400 - A.J. Marshall

A J Marshall (Special Steels) Ltd
Unit 89 Marston Moor Business Park,
Rudgate, Tockwith, York YO26 7QF. UK
Tel. Sales: +44 (0)1423 359111
Fax. Sales: +44 (0)1423 359222

Registered No. 1513555   -   VAT Reg. No. GB 343 1795 54

Email - sales@ajmarshall.com

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RAEX™ 400/500 - Wear Resistant Steel

Technical Data

Wear Resistant Steel.

Scope
RAEX™ is a high strength and wear resistant steel with favourable hardness and impact toughness. With RAEX you can extend the lifespan of machinery, decrease wear in structural components and save costs. It also enables innovative design and lightweight products improving energy efficiency.

Application
Buckets and containers, cutting edges for earth moving machines, wearing parts for mining machines, wearing parts for concrete mixing plants and wood processing machines, platform structures, feeders and funnels.

Tolerances
Tolerances on dimensions and shapes:

Heavy Plates:

Cut Lengths:

Tolerances on thickness according to the EN 10051:2010 category A.

Delivery Condition: The delivery condition of RAEX steel is hardened.

Hardness Values

Steel Grade
Thickness mm
Hardness (HBW)
RAEX 400
2.5 – 6.4
360 - 440
RAEX 400
6 – 30
360 - 440
RAEX 400
30.01 – 40
360 - 480
RAEX 500
4.0 – 5.0
450 - 540
RAEX 500
6 – 40
450 - 540

Materials Testing:
Hardness is measured in Brinell units (HBW) in compliance with EN ISO 6506-1 on a milled surface 0.3-2mm below plate surface. The measurement depth is determined on the basis of product form and plate thickness.

Typical Mechanical Properties

Steel Grade
Yield strength
Rp0,2 MPa
Tensile Strength
Rm MPa
Elongation
A 5 %
Impact Strength, Charpy
V 20 J
RAEX 400
1000
1250
10
-40 C
RAEX 500
1250
1600
8
-30 C

Chemical Composition Content %, maximum (cast analysis)

Steel
Grade
C
Si
Mn
P
S
Cr
Ni
Mo
B

RAEX 400

0.20

0.70

1.70

0.030

0.015

1.50

0.40

0.50

0.004

RAEX500

0.24

0.70

1.70

0.030

0.015

1.00

0.70

0.50

0.004

In addition, aluminium (Al), niobium (Nb), vanadium (V) and/or titanium (Ti) can be used as micro-alloy material.

Supply Condition:
Hardened.

Abrasion Resistance & Hardness:
The microstructure of abrasion resistant steel is martensitic, which guarantees high hardness and tensile strength. High hardness and tensile strength give a steel high resistance to abrasion.

Mechanical Properties

Thickness mm
Cut lengths
Heavy plates
Yield strength
Rp0,2 N/mm²
Tensile
strength
Rm N/mm²
Elongation
A5 %
Hardness
range
HBW
Impact
strength
t°C KV J
3 – 12
5 – 15
1000
1250
10
360 – 420
-40          40
--------
(15) – 30
1000
1250
10
380 – 450
-40          20
--------
(30) – 60
1100
1400
8
380 – 480
-40          20

Carbon Equivalent (CEV)

Thickness mm
3 – 12
5 – 12
(12) – 30
(30) – 60
CEV
0.49
0.45
0.50
0.56

CEV = C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15.

Processing

Flanging

Despite their high strength RAEX 400 can still be formed by free bending or flanging. However, the bending force, springback effect and the bending radius are greater than those for softer structural steels. When bending or flanging, workshop practices, condition of the tools and exact design must be taken in to consideration. Flangeability can be improved by raising the working temperature to 100°C - 200°C.

Welding
Hard Wearing Steel Plate.
All the normal welding procedures can be used, provided that a professional welder pays special attention to the following factors:
          · Use of correct working temperature.
          · Correct choice of welding consumables.
          · Suitable arc energy.

A reserved attitude to post-weld heat treatments should be taken because they have a tendency to weaken the most important property of these steels i.e. wear resistance.

Working Temperature
Increasing the working temperature slows the cooling of welded joints, which decreases the generation of a microstructure that is too hard and brittle and vulnerable to cracking in the heat affected zone (HAZ). It is advisable to increase the working temperature of RAEX 400 steels when the combined plate thickness exceeds about 40mm. Generally a good working temperature of 100°C is enough to ensure a good result. However, when heavy and complicated structures are welded and when welding takes place under difficult circumstances, a higher 150°C – 200°C, working temperature is recommended. A higher working temperature than this may weaken the mechanical properties.

Welding Consumables
Either conventional, so called non-alloyed filler materials or so called alloyed materials that produce higher strength weld metals can be used as filler material. Generally non-alloyed filler materials are silicon and manganese alloyed and the strength of the weld metal they produce remains lower than the strength of the hardened base material.
An important advantage of non-alloyed filler material is that the softer weld metal they produce responds better to welding stresses. This is due to the better elongation and deformation ability of the soft weld metal in comparison with high strength weld metal. It is highly advisable to use low-hydrogen, basic filler materials so that the amount of hydrogen will remain safely low.

Heat Treatment
The steels are not intended to be heat treated during or after fabrication. Tempering at moderate temperatures, 150°C - 200°C, is the only heat treatment which will without fail allow the steel to retain its original wearing properties.

Flame Cutting
A heat affected zone (HAZ) will build up on a thermally cut surface which is similar to the HAZ on a fusion welded steel surface. The surface hardens to a depth of 1mm-2mm during flame cutting and post heat results in a soft tempered layer below this. When flame cutting, the pre-heating and working temperature instructions concerning welding can be used as a guideline. In practice it is advisable to preheat when cutting plates, if the thickness is over 10mm.

The maximum allowable working temperature must be kept below 200°C in order that the wear resistance will meet requirements throughout the plate. The cooling of a cut surface must not be accelerated under any circumstances, on the contrary, the cooling of the plate surface can be slowed down if necessary. A plate brought in from cold outside storage must be allowed to warm up sufficiently before cutting.

Recommended working temperatures for flame cutting
Thickness mm
Temperature °C
15 – 30
50 – 75
(30) – 60
75 - 125
Hard Wearing Steel Plate.

Mechanical Cutting
The mechanical cutting of hardened wear-resistant steels is challenging, as the material to be cut is almost as hard as the cutting blade. RAEX 400 steels can be cut using heavy duty cutting machines.

Machining
AR steels can be machined using heavy-duty machines and hard metal tools. It is even possible to drill holes using tools made of high-speed steel, given proper tool geometry and using suitable cutting fluids.

RAEX®400 - Hard Wearing Steel Plate - Special Structural Steel


Full specification and details are available on request.
The above information is provided for guidance purposes only.
For specific design requirements please contact our technical sales staff.


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