datasheet-creusabro-4800.pdf

Datasheet updated 20131101 11:49:36 (supersedes all previous editions) Creusabro 4800 (Plate and sheet) Creusabro 4800 is a highperformance wear resistant steel, exhibiting a wear resistance 50% higher than that of conventional 400HB water quenched steel. The grade offers the best possible optimization of an exceptional wear resistance and very acceptable workability. Properties of Creusabro 4800 are improved as a result of the combination of an enriched chemical composition (chromium, molybdenum and titanium) and specific heat treatment procedures (oil quenching). This confers to Creusabro 4800 an improved high wear resistance and a very good aptitude for processing, far better than other 400HB water quenched steels. METALLURGICAL CONCEPT Abrasion resistance is not exclusively connected to the hardness of the steel in the as delivered condition. Also the chemical composition and the microstructure strongly influence its performance. A balanced chemical compostion and manufacturing processes of Creusabro 4800 impart a microstructure to the steel which strongly improves its wear resistance by taking advantage of a surface hardening effect of about 70 HB, whatever the applied strain level is (impact, pressure etc.). TRANSFORMATION INDUCED BY PLASTICITY (TRIP) EFFECT Creusabro 4800 has the capability to workharden in service by local plastic deformations transforming retained austenite into very hard fresh martensite, which increases wear resistance. The TRIP effect also contributes to the delay of chip removal from the steel under the action of abrasive particles. FINE DISPERSION OF MICRO CARBIDES The fine microstructure of Creusabro 4800 is obtained by a fine dispersion of micro carbides, just the opposite of the rough acicular lamellar structure typical of 400HB water quenched steels. 400HB water quenched steel (left), Creusabro 4800 (right) CHEMICAL COMPOSITION (NOMINAL) % C Mn S Cr Ni Mo Ti max. max. max. max. max. max. 0.20 1.60 0.005 1.90 0.20 0.40 0.20 MECHANICAL PROPERTIES *

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Datasheetupdated2013110111:49:36(supersedesallpreviouseditions)

Creusabro 4800(Plate and sheet)Creusabro 4800isahighperformancewearresistantsteel,exhibitingawearresistance50%higherthanthatofconventional400HBwaterquenchedsteel.Thegradeoffersthebestpossibleoptimizationofanexceptionalwearresistanceandveryacceptableworkability.

PropertiesofCreusabro4800areimprovedasaresultofthecombinationofanenrichedchemicalcomposition(chromium,molybdenumandtitanium)andspecificheattreatmentprocedures(oilquenching).ThisconferstoCreusabro4800animprovedhighwearresistanceandaverygoodaptitudeforprocessing,farbetterthanother400HBwaterquenchedsteels.

METALLURGICAL CONCEPT

Abrasionresistanceisnotexclusivelyconnectedtothehardnessofthesteelintheasdeliveredcondition.Alsothechemicalcompositionandthemicrostructurestronglyinfluenceitsperformance.

AbalancedchemicalcompostionandmanufacturingprocessesofCreusabro4800impartamicrostructuretothesteelwhichstronglyimprovesitswearresistancebytakingadvantageofasurfacehardeningeffectofabout70HB,whatevertheappliedstrainlevelis(impact,pressureetc.).

TRANSFORMATION INDUCED BY PLASTICITY (TRIP) EFFECT

Creusabro4800hasthecapabilitytoworkhardeninservicebylocalplasticdeformationstransformingretainedausteniteintoveryhardfreshmartensite,whichincreaseswearresistance.TheTRIPeffectalsocontributestothedelayofchipremovalfromthesteelundertheactionofabrasiveparticles.

FINE DISPERSION OF MICRO CARBIDES

ThefinemicrostructureofCreusabro4800isobtainedbyafinedispersionofmicrocarbides,justtheoppositeoftheroughacicularlamellarstructuretypicalof400HBwaterquenchedsteels.

400HBwaterquenchedsteel(left),Creusabro4800(right)

CHEMICAL COMPOSITION (NOMINAL) %

C Mn S Cr Ni Mo Ti

max. max. max. max. max. max.

0.20 1.60 0.005 1.90 0.20 0.40 0.20

MECHANICAL PROPERTIES

*
Hardness,HB Proofstrength0.2%,MPa UTS,MPa Elongation,% KCVL20C,J/cm

MECHANICAL PROPERTIES (TYPICAL VALUES, AS DELIVERED)

370 900 1200 12 45

Hardness:340400HBToughness:KCVL20C30J/cm

Proofstrength0.2%,MPa Ultimatetensilestrength,MPa

AT HIGH TEMPERATURES (TYPICAL VALUES)

200C 400C 500C 200C 400C 500C

940 920 820 1220 1120 900

PHYSICAL PROPERTIES

20100C 20200C 20300C 20400C 20500C

THERMAL EXPANSION (X 10 C )

12.5 13 14 14.5 14.5

Dens i t yat20C:7.85kg/dmModulus of e last ic i ty , E,205000MPa

*CreusabroisatrademarkownedbyIndusteel.

SIZES

Widthxlength,mm Thickness,mm

STANDARD SIZES

2400x8000 540

2400x4000 50100

DISCLAIMER:

Recommendationsareforguidanceonly,andthesuitabilityofamaterialforaspecificapplicationcanbeconfirmedonlywhen

weknowtheactualserviceconditions.Continuousdevelopmentmaynecessitatechangesintechnicaldatawithoutnotice.This

datasheetisonlyvalidforSandvikmaterials.

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www.smt.sandvik.com/contact-us

www.smt.sandvik.com