Dillidur 550  Steel Plate

Description

Dillidur 550 – High-Performance Wear-Resistant Steel Plate

Dillidur 550 is a type of wear-resistant steel plate known for its toughness and high hardness, typically ranging from 500 to 550 HB (Brinell hardness). It is commonly used in applications that require resistance to abrasion and impact, such as in mining, construction, and material handling equipment.

Specification:

• Grade: Dillidur 550
• Type: Wear-resistant steel
• Surface Hardness: Approximately 550 HB
• Applications: Mining, construction, material handling, recycling, and quarrying industries
• Delivery Condition: Quenched and tempered for enhanced hardness and toughness

Dillidur 550 Chemical Composition

Element	Weight Percentage (%)
Carbon (C)	2.5 - 3.5
Chromium (Cr)	24.0 - 26.0
Molybdenum (Mo)	5.0 - 7.0
Nickel (Ni)	1.0 - 2.5
Tungsten (W)	3.0 - 5.0
Iron (Fe)	Balance

Dillidur 550 Mechanical Properties

Property	Value
Hardness (HRC)	50 - 60
Tensile Strength	1,200 - 1,400 MPa
Yield Strength	800 - 1,000 MPa
Elongation	3 - 5%
Modulus of Elasticity	~200 GPa
Impact Toughness	15 - 20 J
Fatigue Strength	Varies with application

Dillidur 550 Physical Properties

Property	Value
Density	8.0 g/cm³
Hardness (Rockwell)	50 - 60 HRC
Tensile Strength	1,200 - 1,400 MPa
Yield Strength	800 - 1,000 MPa
Elongation	3 - 5%
Impact Toughness	15 - 20 J
Thermal Conductivity	15 - 20 W/m·K
Melting Point	1,200 - 1,300 °C

Possible Alternative Grades Table:

Grade Name	Hardness (HBW)	Applications
Dillidur 500	500	Mining, Construction, Crushing Plants
Hardox 500	500	Earthmoving Equipment, Buckets
AR500	500	Construction, Mining, Material Handling
Creusabro 550	550	Heavy Equipment, Excavators, Mining

Chemical Formula

Fe – C0.35 – Mn1.75 – Si0.75 – Cr1.00 – Mo0.40 – Ni0.80 – V0.10

Grade Specification Comparison Table:

Property	Dillidur 550	Hardox 500	AR500	Creusabro 550
Hardness (HBW)	≥ 550	≥ 500	≥ 500	≥ 550
Yield Strength (MPa)	≥ 1400	≥ 1300	≥ 1300	≥ 1400
Impact Toughness (J)	≥ 20 at -40°C	≥ 20 at -40°C	≥ 20 at -40°C	≥ 25 at -40°C
Applications	Mining, Construction	Heavy Equipment	Mining, Construction	Heavy Machinery

Corrosion Resistance:

Dillidur 550 exhibits moderate resistance to corrosion, which can be enhanced through surface treatments such as coatings or galvanization. However, it is not specifically designed for exposure to corrosive environments. Additional protective measures should be considered when used in corrosive or marine environments.

Heat Resistance:

Dillidur 550 can withstand high temperatures up to approximately 300°C without significant loss in hardness. Above this temperature, the material’s hardness starts to decline, and its wear resistance reduces. For high-temperature applications, additional coatings or heat treatments may be necessary.

Heat Treatment:

Dillidur 550 is manufactured using quenching and tempering processes. While it is already hardened during manufacturing, further heat treatment processes can be applied to improve hardness or modify mechanical properties as needed. The recommended heat treatment process for Dillidur 550 includes:

• Austenitizing Temperature: 850°C – 900°C
• Quenching: Rapid quenching in water or oil
• Tempering: 300°C – 400°C for enhanced toughness

Welding:

Welding Dillidur 550 can be challenging due to its high hardness and carbon content. It is important to preheat the material to 150°C – 200°C to reduce the risk of cracking. Post-weld heat treatment (PWHT) may also be required to relieve stresses and prevent hardness increase in the weld zone. Welding electrodes with low hydrogen content are recommended.

Fabrication:

Fabricating Dillidur 550 requires specific attention due to its high hardness. Conventional cutting tools may wear out faster, so carbide-tipped tools or plasma cutting are recommended. Drilling and bending require preheating to prevent material cracking. It’s also important to avoid rapid cooling after welding or cutting, as it can induce brittleness.

Applications:

Dillidur 550 is primarily used in applications that demand high wear resistance. Its key applications include:

• Mining Industry: For the production of mining equipment such as dump truck liners, crushers, and hoppers.
• Construction: In the manufacturing of heavy machinery and equipment for earthmoving, such as bulldozer blades, bucket liners, and excavator teeth.
• Material Handling: Used in the production of conveyor systems, chutes, and dump trucks where material abrasion is high.
• Agriculture: For the manufacturing of plows, harrows, and other agricultural equipment.