Microstructure and wear resistance of high chromium cast iron containing niobium *Li Wei Male born in 1963 Ph D Professor His research interests mainly focus on abrasion metallic materials and metal matrix composites special functional metallic materials tribological research and biomedical materials E-mail: lwxasnsohu grinding roll from NF6357A-high chrome Iron alloy for crushing of solid mineral and grinding operations in a ball mill for cement production The casting conditions and the evolved microstructure after heat treatment greatly affect the wear performance of high chromium white cast iron Quenching seeding and micro-alloying can to a limited

Heat treatment and properties of iron and steel

temperingandcoldtreatment Chemicalcompositions heattreatments andsome properties and usesarepresentedforstructural steels toolsteels stainless and heat- resistingsteels precipitation-hardenable stainlesssteels and nickel-maraging steels

My question is can high chrome cast iron be heat treated to re-harden to 500 HB after annealing or even tempering to 400? Some of the curves in the Abrasion Resistant Cast Iron Handbook suggest some high chrome irons can end up with vastly different hardnesses even after tempering to the same temperature depending on retained austenite

Definition of heat treatment Heat treatment is an operation or combination of operations involving heating at a specific rate soaking at a temperature for a period of time and cooling at some specified rate The aim is to obtain a desired microstructure to achieve certain predetermined properties (physical mechanical magnetic or electrical) 5

Application of the T6 heat treatment results in a decrease of the tensile and yield strengths but a significant increase in ductility as measured by elongation [34 63 80–83] Microstructural examination of the heat-treated samples show that rejection of Si occurred from the supersaturated α-Al matrix to form small Si particles which coarsen with ageing (Fig 2 9) [83]

Application of the T6 heat treatment results in a decrease of the tensile and yield strengths but a significant increase in ductility as measured by elongation [34 63 80–83] Microstructural examination of the heat-treated samples show that rejection of Si occurred from the supersaturated α-Al matrix to form small Si particles which coarsen with ageing (Fig 2 9) [83]

Effect of tungsten on microstructure and properties of

In this study effect of tungsten on microstructure and properties of high chromium cast iron was investigated The experimental results indicated that tungsten distributed uniformly in the matrix and carbides W carbides are composed of WC 1− x W 6 C 2 54 and CW 3 and W 2 C With the increase of tungsten content bulk hardness and matrix

2 2 Heat treatment The annealing of high-chromium white cast iron alloys is conducted when it is necessary to machine the pieces before destabilization This treatment is applied to obtain a soft matrix with the maximum amount of ferrite after

HEAT TREATMENT OF TOOL STEEL 4 Uddeholm Dievar soft annealed structure The purpose of this brochure is to provide a general idea of how tool steel is heat treated and how it behaves during this process Special attention is paid to hardness tough-ness and dimensional stability What is tool steel? To ol steels are high-quality steels

form iron is lustrous silvery soft and ductile However pure iron is a poor engineering material generally not as strong as most plastics Cast irons are based on the Fe-C system and the solid-state transformations on which cast iron heat treatments are based are similar to those applied to steels Heat Treatment of Cast Irons

our cast materials ourselves and check them for compliance with our quality standards at every produc-tion stage The chemical composi- tion (ladle analysis) is monitored from the start of the melting pro-cess A solid chain of quality checks at all stages from the raw material to the fi nished product is one con-dition for producing fl awless high-quality components that

A Review on Superalloys and IN718 Nickel-Based INCONEL Superalloy superalloy subjected to strengthening heat treatment Keywords: Superalloys high temperature alloys IN718 nickel-based superalloy 1 Introduction The origin of the term Superalloy is rather obscure Early works refer only to Heat Resisting Alloys or High Temperature Alloys The nomenclature

For High chrome balls Cr over 10% need to do this process For tempering both low chrome and high chrome balls should do It is to eliminate the inner so that ensure the ball's HRC from core to the surface are uniformly and increase its tenacity There are two heating types for heat treatment process electricity and gas type The client

Martensitic Stainless Steels High carbon high chrome steels are heat treatable as a consequence of the higher carbon content and are known as martensitic stainless steels (e g 410 416) They do however exhibit lower corrosion resistance due to chromium depletion of the oxide film They exhibit good strength and oxidation resistance up to

EN26 High Tensile Steel

EN26 is a 2 5% nickel - chromium - molybdenum high hardenability high tensile steel generally supplied hardened and tempered in the tensile range 1000 - 1150 Mpa (Condition V) Rc 31 - 38 Characterised by high strength and toughness in very large sections - similar to EN25 but with higher carbon content particularly suitable where high surface pressure exists

Heat treatment is any one of a number of controlled heating and cooling operations used to bring about a desired change in the physical properties of a metal Its purpose is to improve the structural and physical properties for some particular use or for future work of the metal There are five basic heat treating processes: hardening case

The high controlled percentage of chromium helps to retard the formation of graphite and stabilize the carbides The article of D Kopyciński et al presents results of heat treatment on the high chromium cast iron The study was carrying out on samples cut from the casting made from chromium cast iron Those were hardened at different

chrome carbides and lead to the consequent chrome loss from the matrix whi ch caused the all oy structure to be susceptible to corrosion However hi gher chrome proporti ons all owed a high-chrome stainless matrix When a thermal treatment was appli ed to alloy samples 4 and 5 they showed better wear-out

19 07 2011Machining and Heat Treating ASTM A-532 Does anyone have any experience working with ASTM A-532 25% high chrome iron? These are cast parts A-532 Grade III is about Rc42/400 BHN at pourand can be annealed down to 300 BHN and machined It can then be heat treated to 600+ BHN Some pump mfgs such as Weir-Wemco use this for grit handling

Our abrasion resistant cast irons can be supplied in a variety of compositions and hardness Depending on your needs Penticton Foundry can cast to finished size and/or fully machine your component If you're wondering why chrome white iron (ASTM A532) is so abrasion resistant read this ASTM A532 Class III Type A*

High Chrome Castings - Cement Mill Liners And The manufacturing process of casting chrome grinding media consists of 6 Main Steps Melting Raw material analysis Molding making balls Seprating Cleaning Heat Treatment Packaging For each step matches with the certain equipment including

different hardening temperatures on the properties of high chromium cast iron were compared The study led to systemize the literature data of the parameters of heat treatment of high chromium cast iron and optimal conditions for heat treatment was proposed for casts of similar properties and parameters