Hardened steel has excellent hardness and strength. Hardened Raex steels are resistant to wear and surface pressure. Using this steel grade in the production of products will increase their service life, reduce the degree of wear of structural parts and save costs. Due to its high strength, Raex steel can be used in the manufacture of lightweight and elegant products with great energy savings. This steel grade makes it possible to create innovative and environmentally friendly products. Raex steels are easy to weld, bend and cut. When processing in factory conditions, it is necessary to observe safety precautions.

Application areas

• Earthmoving Machine Front Edge Plates and Buckets
• Wear parts of mining equipment
• Wear parts of concrete mixing plants and woodworking machinery
• Platforms
• Feeders and funnels

Description of steel grade

Raex 300, Raex 400, Raex 450 and Raex 500 are wear-resistant hardened steels. The numerical designation indicates the average Brinell hardness value: 300, 400, 450 and 500 HBW.

Tolerances on dimensions and shape

Thick sheets

Thickness EN 10029 Class A. Width and length EN 10029. Flatness EN 10029, Class N normal flatness tolerances, steel type H.

Sheets

Thickness, width and length EN 10051. Flatness EN 10029 Class N, steel type H.

Abrasive wear

The martensitic microstructure of abrasion-resistant steel guarantees increased hardness and tensile strength. The hardness of Raex500 steel is more than three times higher than that of structural steel S355, Raex 450 is almost three times higher, and Raex 400 is two and a half times higher. High hardness and tensile strength provide high resistance to abrasion. High wear resistance is the most important argument when choosing these steels.

Tests

Brinell hardness is measured according to EN ISO 6506-1 at a distance of 0.3 – 2 mm from the steel surface. The measurement depth is determined depending on the sheet thickness and the type of product.

Surface finish quality

EN 10163-2 Class A3. Repair welding of thick plates is not permitted.

The process of training sheets (Dead Flat)

Raex hardened steel sheets are tempered (DF) at the factory, a procedure that involves pressing the sheet in a cold state. Residual stresses in the steel are removed, and increased sheet flatness is ensured. This makes it easier to control the sheet welding process. When cutting sheets that have undergone tempering (DF), high sheet flatness is maintained. Thus, sheet straightening is not required before subsequent processing stages. A flat sheet with removed residual stress reduces the production cycle time in sheet metal processing. Information on sheet tempering is included in the quality certificate.

Thickness ranges

Steel grade	Sheets mm	Thick sheets mm
Raex 300	2.5 – 8.0	—
Raex 400	2.5 – 6.4	5 – 60
Raex 450	3.0 – 6.4	6 – 60
Raex 500	4.0 – 5.0	5 – 60

Chemical composition

Maximum content %, (chemical composition of metal)

Steel grade	C	Si	Mn	P	S	Cr	Ni	Mo	B
Raex 300	0.18	0.70	1.70	0.025	0.015	1.50	0.40	0.50	0.005
Raex 400	0.25	0.70	1.70	0.025	0.015	1.50	0.70	0.50	0.005
Raex 450	0.26	0.70	1.70	0.025	0.015	1.00	0.70	0.50	0.005
Raex 500	0.30	0.70	1.70	0.025	0.015	1.00	0.80	0.50	0.005

Additionally, aluminum (Al) and/or titanium (Ti) can be used as micro-alloy materials.

Carbon equivalent content. Typical values

Steel grade	Thickness, mm	CEV	Products
Raex 300	2 – 8	0.47	Sheets
Raex 400	2.5 – 6.4	0.49	Sheets
Raex 400	5 – 12	0.45	Heavy thick sheets
Raex 400	(12) — 30	0.50	Heavy thick sheets
Raex 400	(30) — 60	0.56	Heavy thick sheets
Raex 450	3.0 – 6.4	0.53	Sheets
Raex 450	6 – 30	0.50	Heavy thick sheets
Raex 450	(30) — 60	0.58	Heavy thick sheets
Raex 500	4.0 – 5.5	0.55	Sheets
Raex 500	5 – 60	0.64	Heavy thick sheets

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

Hardness of each type of product and thickness

Steel grade	Products	Thickness mm	HBW hardness range
Raex 300	Sheets	2.0 – 8.0	270 – 390
Raex 400	Sheets	2.5 – 6.4	360 – 420
Raex 400	Heavy thick sheets	5 – 15	360 – 420
Raex 400	Heavy thick sheets	(15) — 30	360 – 450
Raex 400	Heavy thick sheets	(30) — 60	360 – 480
Raex 450	Sheets	3.0 – 6.4	420 – 500
Raex 450	Heavy thick sheets	6 – 60	420 – 500
Raex 500	Sheets	4.0 – 5.5	450 – 540
Raex 500	Heavy thick sheets	5 – 60	450 – 540

Typical mechanical properties

Steel grade	Yield strength Rp0.2 MPa	Tensile strength Rm MPa	Elongation A5%	Impact strength, Charpy V 20 J
Raex 300	900	1000	11	-40 C
Raex 400	1000	1250	10	-40 C
Raex 450	1200	1450	8	-40 C
Raex 500	1250	1600	8	-30 C

The values ​​for steel grades Raex 400, Raex 450 and Raex 500 are typical mechanical properties tested on 20 mm thick sheets.

The values ​​for Raex 300 are typical mechanical properties tested on a thick plate, 8 mm thick.