This material specification applies to 4mm – 40mm thick plates of wear-resistant special structural steel XAR 600. The extraordinary high resistance to abrasion of XAR 600 results from a special water quenching process.
Application
The steel may be used at the discretion of the purchaser for wear-exposed structures, e.g. excavating, mining and earth-moving machinery, truck dump bodies, conveying, crushing and pulverising equipment and scrap presses.\
The processing and application techniques as a whole are of fundamental importance for the successful use of the products fabricated of this steel. The processor/fabricator must assure himself, that his design and work methods are appropriate for the material, are state-of-the-art and are suitable for the envisaged purpose.
The selection of the material is left up to the purchaser.
Chemical Composition (heat analysis, %)
|
C |
Si |
Mn |
P |
S |
Cr |
Mo |
Ni |
Nb |
B |
|
≤0. 40 |
≤0.80 |
≤1.50 |
≤0.025 |
≤0.010 |
≤1.50 |
≤0.50 |
≤1.50 |
≤0.050 |
≤0.005 |
The steel is produced with a fine-grained structure. The nitrogen is fixed as nitrides by means of aluminiumand, where applicable, titanium.
Delivery Condition
Annealed or quenched resp. quenched and tempered (see ‘Heat Treatment’).
Hardness at Room Temperature
In annealed condition: ≤300 HB,
In the quenched resp. quenched and tempered condition: >550 HB.
The Brinell hardness shall be determined in accordance with ISO 6506.
Properties Typical of 15mm Plate Thickness
| Carbon equivalent CET (%) [CET=C+(Mn+Mo) /10+(Cr+Cu)/20+Ni/40] | 0.53 |
| Carbon equivalent CE (%) [CE=C+Mn/6+(Cr+Mo+V) /5+(Ni+Cu) /15] | 0.79 |
| Yield strength (MPa) *) | 1700 |
| Tensile strength (MPa) | 2000 |
| Elongation at fracture A (%) | 8 |
| Notch-bar impact energy at -20°C on Charpy V-longitudinal test specimens (J) | 20 |
| *) 1 MPa = 1 N/mm² |
Number of Tests
Unless otherwise agreed upon in the order, the Brinell hardness shall be determined from each heat. The hardness shall be measured roughly 1 mm below the surface.
General Processing Information
Prior to any processing, it is advisable to make use of the information available from the steel producer in order to draw on that experience for the processing.
The following information can deal with only a few essential points. Recommendations for welding are also given in given in EN 1011 part 1 and part 2 – Welding, Recommendation for welding of metallic materials-.
It is left to the discretion of the processor/fabricator to decide which of the familiar precautions must be adopted to avoid cracking during thermal cutting and welding under the prevailing construction and fabrication conditions.
Machinability
In spite of its high wear resistance, the steel exhibits good machinability if sufficiently heavy machine-tools and sharp carbide-tipped tools are used. The feed rate and cutting speed have to be adjusted to the high hardness of the material.
Heat Treatment
Plates of the XAR 600 grade receive the required properties as a result of austenitizing and follow-on quenching in special facilities and, where applicable, tempering below Ac1. The heat treatment depends on the chemical composition and the product thickness. To avoid hardness losses, the steel must not be heated above 250°C.
Thermal Cutting
Preferably the flame-cutting process is used. For small product thicknesses, however, the plasma cutting process is used in the interest of minimum distortion.
In order to avoid cracking, preheating to about 125°C is recommended when flame-cutting thicknesses up to around 20mm. For the flame-cutting of thicker plates a temperature of 175°C is recommended.
Welding
If due consideration is given to the general rules for welding, XAR 600 is weldable both manually and automatically. Preferably, the MAG-welding method is used. To prevent cold cracking in the welded joints only welding consumables giving welds of very low hydrogen content should be used.
To avoid cold cracking in the welded joints, the use of welding consumables with austenitic filler metals is recommended. Preheating is not generally necessary for welding with austenitic filler metals.
General Information
Unless otherwise agreed upon in the order, the delivery will be governed by the conditions outlined in EN 10021.
The admissible tolerances are based on EN 10051 for plates cut from hot strip and EN 10029 for four-high mill plates, unless other terms have been agreed upon.
The plates will be supplied with a maximum flatness tolerance according to EN 10029, table 4, steel type H plus 3mm per meter. Smaller flatness tolerances can be agreed upon at the time of ordering.
For surface quality requirements EN 10163 is applicable.
As per special agreement it is possible to supply plates descaled or descaled and primed.
