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Seven advantages of surfacing composite wear-resistant materials

Release time:

2023-10-27

1.ExcellentwearresistanceThechemicalcompositionofthealloywear-resistantlayerhasacarboncontentof4to5%andachromiumcontentof25to30%.ThevolumefractionofCr7C3carbidesinthemetallographicstructureismorethan50%.ThemacroscopichardnessisHRC56to62.ThehardnessisHV1400～1800.Becausethecarbidesaredistributedverticallyinthedirectionofwear,evenwhencomparedwithcastalloysofthesamecompositionandhardness,thewearresistanceismorethandoubled. Thewearresistancecomparisonwithseveraltypicalmaterialsisasfollows:(1)comparisonwithlowcarbonsteel;20～25:1(2)comparisonwithhighchromiumcastiron;1.5～2.5:1 2.GoodimpactresistanceThebaseplateofcompositewear-resistantmaterialislowcarbonsteelorlowalloy.Toughmaterialssuchasstainlesssteelreflectthesuperiorityofbimetal.Thewear-resistantlayerresiststhewearofthewearmedium,andthesubstratebearstheloadofthemedium,soithasgoodimpactresistance.Itcanwithstandtheimpactandwearofthehighdrophopperinthematerialconveyingsystem. 3.BetterheatresistanceThealloywear-resistantlayerisrecommendedtobeusedunder≤600℃.Ifvanadium,molybdenumandotheralloysareaddedtothealloywear-resistantlayer,itcanwithstandhightemperaturewearof≤800℃. TherecommendedoperatingtemperatureisasfollowsOrdinarycarbonsteelsubstrateisrecommendedtobeusedunder380℃;lowalloyheat-resistantsteelplate(15CrMo,12Cr1MOV,etc.)isrecommendedtobeusedunder540℃;heat-resistantstainlesssteelsubstrateisrecommendedtobeusedunder800℃. 4.GoodcorrosionresistanceThealloylayerofthecompositewear-resistantmaterialcontainsahighpercentageofmetallicchromium,soithascertainanti-rustandcorrosionresistance.Itcanbeusedtopreventcoalstickingwhenusedincoaldroppingdrumsandhoppers. 5.CompletevarietiesandspecificationsWear-resistantsteelplatehascompletespecificationsandmanyvarieties,andhasbecomeacommercialseries.Thethicknessofthewear-resistantalloylayeris3-20mm.Thethicknessofthecompositesteelplateisatleast6mm,andthethicknessisnotlimited.Atpresent,thestandardwear-resistantsteelplatecanbeprovidedwith1200or1450×2000mm,anditcanalsobecustomizedandprocessedaccordingtothesizeofthedrawingaccordingtouserneeds.Wear-resistantsteelplatesarenowdividedintothreetypes:ordinarytype,impact-resistanttypeandhigh-temperaturetype.Orderinghigh-temperaturewear-resistantandimpact-resistantcompositesteelplatesshouldbeexplained. 6.ConvenientprocessingperformanceThecompositewear-resistantmaterialcanbecut,bent,weldedandpunched,anditcanbeprocessedintovariouspartsthatcanbeprocessedbyordinarysteelplates.Thecutwear-resistantsteelplatescanbetailor-weldedintovariousengineeringstructuralpartsorparts. 7.Functionsandfeaturescanbewelded,goodwearresistance.

1. Excellent wear resistance

The chemical composition of the alloy wear-resistant layer has a carbon content of 4 to 5% and a chromium content of 25 to 30%. The volume fraction of Cr7C3 carbides in the metallographic structure is more than 50%. The macroscopic hardness is HRC56 to 62. The hardness is HV1400～1800. Because the carbides are distributed vertically in the direction of wear, even when compared with cast alloys of the same composition and hardness, the wear resistance is more than doubled.

The wear resistance comparison with several typical materials is as follows:

(1) comparison with low carbon steel; 20～25:1

(2) comparison with high chromium cast iron; 1.5～2.5:1

2. Good impact resistance

The base plate of composite wear-resistant material is low carbon steel or low alloy. Tough materials such as stainless steel reflect the superiority of bimetal. The wear-resistant layer resists the wear of the wear medium, and the substrate bears the load of the medium, so it has good impact resistance. It can withstand the impact and wear of the high drop hopper in the material conveying system.

3. Better heat resistance

The alloy wear-resistant layer is recommended to be used under ≤600℃. If vanadium, molybdenum and other alloys are added to the alloy wear-resistant layer, it can withstand high temperature wear of ≤800℃.

The recommended operating temperature is as follows

Ordinary carbon steel substrate is recommended to be used under 380℃; low alloy heat-resistant steel plate (15CrMo, 12Cr1MOV, etc.) is recommended to be used under 540℃; heat-resistant stainless steel substrate is recommended to be used under 800℃ .

4. Good corrosion resistance

The alloy layer of the composite wear-resistant material contains a high percentage of metallic chromium, so it has certain anti-rust and corrosion resistance. It can be used to prevent coal sticking when used in coal dropping drums and hoppers.

5. Complete varieties and specifications

Wear-resistant steel plate has complete specifications and many varieties, and has become a commercial series. The thickness of the wear-resistant alloy layer is 3-20mm. The thickness of the composite steel plate is at least 6mm, and the thickness is not limited. At present, the standard wear-resistant steel plate can be provided with 1200 or 1450×2000mm, and it can also be customized and processed according to the size of the drawing according to user needs. Wear-resistant steel plates are now divided into three types: ordinary type, impact-resistant type and high-temperature type. Ordering high-temperature wear-resistant and impact-resistant composite steel plates should be explained.

6. Convenient processing performance

The composite wear-resistant material can be cut, bent, welded and punched, and it can be processed into various parts that can be processed by ordinary steel plates. The cut wear-resistant steel plates can be tailor-welded into various engineering structural parts or parts.

7. Functions and features

can be welded, good wear resistance.

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