Creusabro 8000

Use Creusabro 8000 High Performance Steel for Your Toughest Jobs

Creusabro 8000 is crafted using a unique combination of a precise heat treatment process and an enriched alloying content comprised of chromium, nickel, molybdenum and titanium. Its particular chemical composition allows Creusabro 8000 to outperform commonly used 500 HB water quenched steel in high wear, high impact environments.

This versatile steel provides excellent weldability and respectable workability while offering a wear resistance 50% higher than that of common water quenched steel. Additionally, Creusabro 8000’s moderate hardness prior to work-hardening makes cutting, machining and forming operations a breeze.

 

Where Should You Use Creusabro 8000?

Creusabro 8000 is perfectly suited for the toughest environments including mines and quarries, cement and steelmaking industries, public works and agricultural machinery. It thrives in highly abrasive, high impact conditions due to the steel’s ability to work-harden, increasing its hardness by 70 additional points. This improves Creusabro 8000’s service life and, by extension, creates considerable cost saving benefits.

Creusabro 8000 can be applied in environments where impact, sliding and abrasion are expected, and works well in both dry or wet environments including temperatures up to 350-450c.

Standards

CSPMnNiCrMo
<0.28≤0.005≤0.018≤1.6≤1.0≤1.6≤0.40
 Hardness (HB)YS MPa (ksi)UTS MPa (ksi)Elongation %KCVL -20°C (-4°F) J (ft.lb)E GPa
Indicative values4701250 (181)1630 (236)1244 (32)205

Guaranteed values (as supplied) Hardness 430-500 HB

Density at +20°C (68°F) = 7.85 kg/dm3

Expansion coefficient – average (10-6/°C)

20/100°C (68/212°F)20/200°C (68/392°F)20/300°C (68/572°F)20/400°C (68/752°F)20/500°C (68/932°F)
11.212.012.513.213.8

Metallurgical Concept

Near resistance depends not only on the hardness of the steel in the as delivered state, but also on the other properties, such as crack resistance, work hardening, strength, ductility, softening resistance, etc. The performance in service of given wear resistant steel is strongly influenced by the microstructure obtained after thermal processing. In the case of Creusabroo 8000, a significant improvement of the wear resistance in service is mainly due to the following properties:

TRIP Effect (Transformation Induced by Plasticity)

Due to its initial structure not fully martensitic (a mix of martensite, bainite and retained austenite), Creusabro 8000 has the ability to work-harden when submitted to local plastic deformation in service. Plastic deformation induces a surface hardening phenomenon by transformation of retained austenite into fresh and very hard martensite while the material remains ductile underneath, makes it a most effective to withstand both abrasion and heavy impact in service.

In addition, the super ductility of the retained austenite contributes to improve the lifetime in service by allowing larger micro shearing and thus delays the ultimate tearing of metal particles from the surface of the material exposed to the abrasive.

Fine dispersion of micro carbides

The fine microstructure of Creusabro 8000 is a result of a specific chemical composition combined with a controlled cooling rate. Such a microstructure differs from the rough acicular lamellar structure which is typical of the fully martensitic steels (conventional 500 HB water quenched steels). Moreover, the fine and homogeneous dispersion of micro carbides significantly contributes to improve the reinforcement of the matrix by improving the sliding wear resistance in service.

Properties at High Temperature

Chemical composition of Creusabro 8000, and especially chromium, molybdenum and titanium contents, confers a high softening resistance to the material. Such a quality allows using Creusabro 8000 in hot service conditions, at a maximum of 450°C (840°F) while conventional 500 HB water quenched steels are limited to 250°C (480°F). It is also possible to process the steel at high temperature 500-550°C (930-1020°F) ( hot forming: bending, rolling) followed by a slow air cooling without any significant drop of hardness (about 30-50 HB).

Yield Strength

200°C (392°F)400°C (752°F)500°C (932°F)
1080 (156)880 (127)520 (75)

 

UTS

200°C (392°F)400°C (752°F)500°C (932°F)
1650 (236)1250 (181)900 (130)

Service Life

Whatever the service conditions, the original metallurgical concept of Creusabro 8000 confers to the material an improvement of its performance in terms of wear resistance and workability, compared to other conventional 500 HB water quenched steels. Creusabro 8000 is particularly suitable for extreme applications, when severe abrasion conditions are combined with huge impact, heat or moderate corrosion.

Field Tests

Many tests were performed in different areas of industries which confirm the high performance of Creusabro 8000 compared to 500 HB water quenched steels.

Service life versus 500 HB steels

Areas of IndustriesApplicationThickn. PieceService Life
Mines (gold ore)Wear parts – External liner of bucket excavator30 mm (1.2”)+ 100%
Foundry (handling hot aggloerate)Extracting plates12 mm (0.47”)+ 36%
Iron making (iron ore + coal)Wear parts – Internal chute liner15 mm (0.6”)+ 35%
Fertilizer industryCrushing hammers15 mm (0.6”)+ 58%
Wood industryPneumatic chip handling (pipe elbows)12 mm (0.47”)+ 38%
Glass recycling (calcin)Belt conveyor (guide plate)15 mm (0.6”)+ 69%
Quarry (granite)Wear parts (internal side of a jaw crusher)40 mm (1.6”)+ 50%

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