Ferrous and Non-ferrous materials

Ferrous and Non-ferrous materials
Dr. Siddhalingeshwar I.G.

Engineers are often involved in materials selection decisions, which necessitates that they have some familiarity with the general characteristics of a wide variety of materials. In addition, access to data bases containing property values for a large number of materials may be required. Hence this chapter presents an opportunity for the learners to introduce them to knowledge on ferrous and nonferrous materials.

Chapter 7: Lesson schedule
01. Introduction to ferrous and non-ferrous alloys. 02. Types of Cast iron properties and applications. 03. AISI and BIS designation of steels 04. Non ferrous alloys – composition, properties and applications. 05. Non ferrous alloys – composition, properties and applications. 06. Application areas (Tool materials, etc)

Learning Outcomes Identify the physical properties of different steel alloys, aluminum alloys based on the chemical composition. Analyze the suitability of ferrous / non-ferrous materials as candidate material to be used to design a particular component.

Why Materials ??? Function dictates the choice of material and shape.
Shape restricts the choice of material and process. Function Material Shape Process Process is influenced by material Process interacts with shape. Material selection and process cannot be separated from the shape and the function of the product, two way interaction.

Engineering Materials
Plastics Metals Steel Stainless steel Die & tool steel Cast iron Ferrous Non-ferrous Aluminum Copper Zinc Titanium Tungsten Thermoplastics Acrylic Nylon ABS Polyethylene Polycarbonate PVC Thermosets Phenolic Polymide Epoxies Polyester Elastomers Rubber Polyurethane Silicone

Engineering Materials
Composites Reinforced plastics Metal-Matrix Ceramic-Matrix Laminates Ceramics Glass Carbides Nitrides Graphite Diamond Glasses Glass ceramics Metals Plastics

Metals Ferrous Metals Super alloys Non-ferrous metals Cast irons
Steels Super alloys Iron-based Nickel-based Cobalt-based Non-ferrous metals Aluminum and its alloys Copper and its alloys Magnesium and its alloys Nickel and its alloys Titanium and its alloys Zinc and its alloys Lead & Tin Refractory metals Precious metals

Where do metals come from?
Metals form part of the earth’s crust as metal ore. To obtain useful metals, the metal ore is mined and washed to remove other minerals and unwanted materials. Iron ore is the basis for most steels. To extract pure iron the iron ore is heated in a furnace in a process known as smelting.

Stock forms of metals Metals are available in several raw forms. Each form is suitable for different manufacturing processes depending on the type of equipment used, the cost of the metal, the scale of production and the properties of the finished product. flat strip round rod round tube square square tube hexagonal angle channel octagonal sheet

Ferrous metals Ferrous metals are obtained from iron ore. You might recognize the letters ‘Fe’ from the periodic table, where they represent iron. Ferrous facts Ferrous metals: Iron replaced bronze as the principal metal by 1000 BC. Early pots and pans made from iron poisoned the users! Early steels were made by adding carbon to iron as it was melted over a charcoal fire. contain iron will corrode unless protected are attracted by a magnet are strong, rigid and cheap.

Non-ferrous metals Non-ferrous metals do not contain iron. These are pure metals used by designers, manufacturers and engineers in a wide variety of applications. Non-ferrous facts Non-ferrous metals: Aluminium is the most common non-ferrous metal, found in abundance in bauxite ore. Non-ferrous metals are not magnetic. contain no iron are not attracted by a magnet.

Alloys Sometimes ferrous and non-ferrous metals require different properties in order to function better in specific situations. Alloying metals involves mixing two or more metals and other elements to improve their properties. Alloying metals can: lower the melting point alter thermal and electrical properties make a material harder for cutting purposes improve resistance to corrosion help metal to flow better into a cast.

Ferrous Metals

Ferrous Metals Ferrous is an adjective used to indicate the presence of iron. The word is derived from the Latin word ferrum ("iron"). Ferrous metals include steel and pig iron (with a carbon content of a few percent) and alloys of iron with other metals (such as stainless steel). Manipulation of atom-to-atom relationships between iron, carbon, and various alloying elements establishes the specific properties of ferrous metals.

Iron with 1.7 to 4.5% carbon and 0.5 to 3% silicon
Overview of cast iron Iron with 1.7 to 4.5% carbon and 0.5 to 3% silicon Lower melting point and more fluid than steel (better castability) Low cost material usually produced by sand casting A wide range of properties, depending on composition & cooling rate Strength Hardness Ductility Thermal conductivity Damping capacity

Cast Irons Cast iron - Ferrous alloys containing sufficient carbon so that the eutectic reaction occurs during solidification. Types of cast irons: Gray cast iron White cast iron Malleable cast iron Ductile or nodular, cast iron Compacted graphite cast iron

Production of cast iron
Pig iron, scrap steel, limestone and carbon (coke) Cupola Electric arc furnace Electric induction furnace Usually sand cast, but can be gravity die cast in reusable graphite moulds Not formed, finished by machining

Types of cast iron White CI Grey CI CAST IRONS Ductile CI Malleable CI
Malleabilize Grey CI CAST IRONS Stress concentration at flake tips avoided Ductile CI Good castability  C > 2.4% Malleable CI Alloy CI

Schematic drawings of the five types of cast iron: (a) gray iron, (b) white iron, (c) malleable iron, (d) ductile iron, and (e) compacted graphite iron.

Grey cast iron Flake graphite in a matrix of pearlite, ferrite or martensite Wide range of applications Low ductility - elongation 0.6% Grey cast iron forms when Cooling is slow, as in heavy sections High silicon or carbon

Typical properties Depend strongly on casting shape & thickness
AS1830 & ASTM A48 specifies properties Low strength, A48 Class 20, Rm 120 MPa High carbon, 3.6 to 3.8% Kish graphite (hypereutectic) High conductivity, high damping High strength, A48 Class 60, Rm 410 MPa Low carbon, (eutectic composition)

Graphite form Uniform Rosette Superimposed (Kish and normal)
Interdendritic random Interdendritic preferred orientation

Matrix structure Pearlite or ferrite Transformation is to ferrite when
Cooling rate is slow High silicon content High carbon equivalence Presence of fine undercooled graphite

Properties of grey cast iron
Machinability is excellent Ductility is low (0.6%), impact resistance low Damping capacity high Thermal conductivity high Dry and normal wear properties excellent Applications Engines Cylinder blocks, liners, Brake drums, clutch plates Pressure pipe fittings (AS2544) Machinery beds Furnace parts, ingot and glass moulds

Ductile iron Inoculation with Ce or Mg or both causes graphite to form as spherulites, rather than flakes Also known as spheroidal graphite (SG), and nodular graphite iron Far better ductility than grey cast iron

Microstructure Graphite spheres surrounded by ferrite
Usually some pearlite May be some cementite Can be hardened to martensite by heat treatment

Production Composition similar to grey cast iron except for higher purity. Melt is added to inoculant in ladle. Magnesium as wire, ingots or pellets is added to ladle before adding hot iron. Mg vapour rises through melt, removing sulphur.

Properties Strength higher than grey cast iron
Ductility up to 6% as cast or 20% annealed Low cost Simple manufacturing process makes complex shapes Machinability better than steel

Applications Automotive industry 55% of ductile iron in USA
Crankshafts, front wheel spindle supports, steering knuckles, disc brake callipers Pipe and pipe fittings (joined by welding) see AS2280

Malleable iron Graphite in nodular form
Produced by heat treatment of white cast iron Graphite nodules are irregular clusters Similar properties to ductile iron.

Microstructure Uniformly dispersed graphite
Ferrite, pearlite or tempered martensite matrix Ferritic castings require 2 stage anneal. Pearlitic castings - 1st stage only

Properties Applications Similar to ductile iron Good shock resistance
Good ductility Good machinability Applications Similar applications to ductile iron Malleable iron is better for thinner castings Ductile iron better for thicker castings >40mm Vehicle components Power trains, frames, suspensions and wheels Steering components, transmission and differential parts, connecting rods Railway components

Alloy Cast Irons Cr, Mn, Si, Ni, Al  the range of microstructures
Beneficial effect on many properties   high temperature oxidation resistance   corrosion resistance in acidic environments   wear/abrasion resistance Graphite free Alloy Cast Irons Graphite bearing

Cr addition (12- 35 wt %) High Cr
Excellent resistance to oxidation at high temperatures High Cr Cast Irons are of 3 types: 12-28 % Cr  matrix of Martensite + dispersed carbide 29-34 % Cr  matrix of Ferrite + dispersion of alloy carbides [(Cr,Fe)23C6, (Cr,Fe)7C3] 15-30 % Cr % Ni  stable  + carbides [(Cr,Fe)23C6, (Cr,Fe)7C3] Ni stabilizes Austenite structure High Cr 29.3% Cr, 2.95% C

Ni: Ni-Hard Stabilizes Austenitic structure
 Graphitization (suppresses the formation of carbides) (Cr counteracts this tendency of Ni for graphitization)  Carbon content in Eutectic Moves nose of TTT diagram to higher times  easy formation of Martensite Carbide formation in presence of Cr increases the hardness of the eutectic structure  Ni Hard Cast Irons (4%Ni, 2-8% Cr, 2.8% C) Ni-Hard Good abrasion resistance Needles of Martensite Transformation sequence Crystallization of primary  Eutectic liquid   + alloy carbide   Martensite 4%Ni, 2-8% Cr, 2.8% C

Ni-resist Ni Resist Iron: 15-30% Ni + small amount of Cr:
Austenitic Dendrites + Graphite plates/flakes + interdendritic carbides due to presence of Cr Resistant to oxidation (used in chemical processing plants, sea water, oil handling operations…) Graphite plates Dendrites of  Ni-resist

CI with 5 % Si Silal Iron (trade name): Alloy CI with 5% Si
Si allows solidification to occur over larger temperature range  promotes graphitization Forms surface film of iron silicate  resistant to acid corrosion CI with 5 % Si

General Properties and Applications of Ferrous Alloys
Ferrous alloys are useful metals in terms of mechanical, physical and chemical properties. Alloys contain iron as their base metal. Carbon steels are least expensive of all metals while stainless steels is costly.

Grades of Steel Over 3,500 different grades of steel exist. Commercial steel is generally classified into four groups depending on their metal alloy content and end-use applications: 1. Carbon Steels (including low carbon, medium carbon and high carbon steels). 2. Alloy Steels (common alloy metals; manganese, silicon, nickel and chromium). 3. Stainless Steels (contain about 10% chromium and classified as austenitic, ferritic and martensitic). 4. Tool Steels (alloyed with high temperature and hard metals, such as molybdenum and tungsten).

The effect of carbon on the strength of steels

Carbon and alloy steels
Carbon steels Classified as low, medium and high: Low-carbon steel or mild steel, < 0.3%C, bolts, nuts and sheet plates. Medium-carbon steel, 0.3% ~ 0.6%C, machinery, automotive and agricultural equipment. High-carbon steel, > 0.60% C, springs, cutlery, cable.

Steels containing significant amounts of alloying elements. Structural-grade alloy steels used for construction industries due to high strength. Other alloy steels are used for its strength, hardness, resistance to creep and fatigue, and toughness. It may heat treated to obtain the desired properties.

High-strength low-alloy steels Improved strength-to-weight ratio. Used in automobile bodies to reduce weight and in agricultural equipment. Some examples are: Dual-phase steels Micro alloyed steels Nano-alloyed steels

Stainless steels Characterized by their corrosion resistance, high strength and ductility, and high chromium content. Stainless as a film of chromium oxide protects the metal from corrosion.

Stainless steels Five types of stainless steels: Austenitic steels
Ferritic steels Martensitic steels Precipitation-hardening (PH) steels Duplex-structure steels

Selection of Carbon and Alloy Steels for Various Applications

Mechanical Properties of Selected Carbon and Alloy Steels in Various Conditions

Room-Temperature Mechanical Properties and Applications of Annealed Stainless Steels

Tool and die steels Designed for high strength, impact toughness, and wear resistance at a range of temperatures.

Basic Types of Tool and Die Steels

Nonferrous Metals

Nonferrous Metals In metallurgy, a non-ferrous metal is any metal, including alloys, that does not contain iron in appreciable amounts. Generally more expensive than ferrous metals, non-ferrous metals are used because of desirable properties such as low weight (e.g., aluminium), higher conductivity (e.g., copper), non-magnetic property or resistance to corrosion (e.g., zinc). Important non-ferrous metals include aluminium, copper, lead, nickel, tin, titanium and zinc, and alloys such as brass. Precious metals such as gold, silver and platinum are also non-ferrous.

Classification of non-ferrous materials
a) Density based: light metals and alloys ρ < 5000 kg/m3 (Mg, Al, Ti) medium metals and alloys ρ = kg/m3 (Sn, Zn, Sb, Cr, Ni, Mn, Fe, Cu) heavy metals and alloys ρ >10000 kg/m3 (Pb, Ag, Au, Ta, W, Mo) b) Melting temperature based: low melting point Tm < TmPb = 327 °C (Sn, Pb, Bi) medium melting point = 327…1539 °C (Al, Mg, Mn, Cu, Ni, Co, Ag, Au) refractory Tm > TmFe = 1539 °C Element Ti Cr V Nb Mo Ta W Tm, °C 1660 1875 1900 2415 2610 2996 3410

Aluminium and aluminium alloys

Factors for selecting are:
High strength to weight ratio Resistance to corrosion High thermal and electrical conductivity Ease of machinability Non-magnetic

Aluminium and aluminium alloys
Pure Al Al-alloys Powder aluminium Deformable Cast alloys alloys Heat- Non heat Heat Non heat- treatable treatable treatable treatable Partial solubility No solubility Partial solubility No solubility

Aluminium Aluminium is the third most abundant element in the earth's crust, behind silicon and oxygen. It is the most abundant metal. It is strong, lightweight, electrically- and thermally-conductive, and corrosion resistant. It is often anodized to help prevent corrosion also its electrical conductivity make it an excellent choice for electrical applications such as wiring and conductors. Its strength-to-weight ratio makes it attractive in structural applications as well as cast aluminum engine components, e.g. blocks, heads, and manifolds. Its high reflectivity of infrared and visible radiation makes it desirable in headlights, light fixtures, and many insulations. It is also used as a paint pigment.

Aluminum qualities

- Metallurgical (99,5…99,8% Al)
Pure Al - Metallurgical (99,5…99,8% Al) - Refined (up to 99,9% Al) Al 99,9% Rm = 70…135 N/mm2 Work hardening of Al Conditions designations O – annealed H – work hardened (degree of hardening H1-H9) W – quenched T – quenched and aged (T1-T9)

Designation system of Al and Al-alloys
Materials numbers Deformable alloys Series 1000 – pure Al 2000 – Al-Cu-alloys (for ex EN-AW-2014) 3000 – Al-Mn-alloys – Al-Si-alloys 5000 – Al-Mg-alloys 6000 – Al-Mg-Si-alloys 7000 – Al-Zn-alloys 8000 – Al-Fe-alloys Cast alloys Series – pure Al 20000 – Al-Cu-alloys – Al-Si-alloys (for ex EN-AC-44000) 50000 – Al-Mg-alloys 70000 – Al-Zn-alloys

Designation system of Al and Al-alloys

Application of Al alloys
Aluminum alloys are widely used for aeronautical applications because of high strength weight ratio. For automobiles for reducing weight of the vehicle thus reducing fuel consumption. For applications as electrical conductors including overhead transmission lines. House hold and consumer items such as utensils. Used as sacrificial anode. Marine applications. For surface transport such as fittings in railway coaches and buses. Aluminum is also used in making windows, doors and roofs of factories. Also in Sporting Equipments.

Common Applications of Aluminium
aluminium foils beverage cans * Both are alloys of 92% to 99% aluminium

Newer Applications of Aluminium
drive shafts Radiators cylinder heads suspension systems *proven to be most advantageous when dealing with weight versus strength versus cost considerations.

Some of the major uses of aluminium and its alloys
Packaging (drinking cans and foil) Building and construction (siding and roofing, doors and windows, building wiring) Electrical applications (overhead transmission lines, cable sheathing and wiring) Transportation (sheet, tube, castings, bodies, firm, and mechanical parts of cars, boats and planes)

Some of the major uses of aluminium and its alloys
Household items (cooking utensils) musical instruments (guitars) sports equipment (baseball bats) Paint and pyrotechnics Currency (coins)

Major producers of the metal in the country include the state -owned National Aluminium Company Ltd (NALCO) and private sector units - Bharat Aluminium Company Limited (BALCO), Hindustan Aluminium Company Ltd (HINDALCO) and Vedanta Aluminium Company Ltd (VAL).

Copper and copper alloys

Copper alloys have electrical and mechanical properties, corrosion resistance, thermal conductivity and wear resistance. Applications are electronic components, springs and heat exchangers. Brass is an alloy of copper and zinc. Bronze is an alloy of copper and tin.

Copper and copper alloys
Pure Cu Cu-alloys Brasses Bronzes Cupronickels Deformable Cast Deformable Cast alloys alloys alloys alloys

Pure Cu Annealed Cu (99,85% Cu); Rm → 250 N/mm2
El. conductivity 1/ρ = 58 Ω·mm2/m = 100% IACS Strengthening of Cu at work hardening Conditions designations A – elongation (ex A007) B – bending strength (ex B410) G – grain size (ex G020) H – HB or HV (ex H150) R – tensile strength (ex R500) Y – yield strength (ex Y460)

Designation system of Cu and Cu-alloys
pure Cu – Cu-ETP etc. Cu deformable alloys – CuZn36Pb3 Cu cast alloys – G-CuSn10 (types of casting : GS – sand casting, GM – die casting, GZ – centrifugal casting, GS – cont. casting , GP – pressure die casting) Conditions (properties) based designation after main designation (EN1173) Letters A – elonagtion (ex Cu-OF-A007) B – bending strength (ex CuSn8-B410) D – drawn, without mech. properties G – grain size (ex CuZn37-G020) H – hardness (Brinell or Vickers) (ex CuZn37-H150) M – as manufactured cond. , without mech. properties R – tensile strength (ex CuZn39Pb3-R500) Y – yield strength (ex CuZn30-Y460)

Designation system of Cu and Cu-alloys
Materials numbers Includes 2-digit marking, followed by three digit designating the material group ( ) C – copper based alloy CB – ingot CC – casting CM – master alloy CR – rafined Cu CS – brazing and welding material CW – wrought CX – non standardized material For example Designation Material No. Deformable copper Cu-0F CW009A Deformable alloys CuZn37 CW508L Cast copper Cu-C CC040A Cast alloys CuSn10-C CC480K

Cu-Zn alloys – brasses (ex CuZn20)
Influence of Zn to properties Influence of Pb to machining Free cutting brass – 100% (comp.: 40% Zn, 2% Pb)  CuZn40Pb2

Copper alloys Cu-Ni alloys (→ 50% Ni) permanent CTE
(constantan) – 45% Ni corrosion resistant (Ni+Fe+Mn) – 30% Ni Cu - 25% Ni (coin melhior, cupronickel). Cu % Ni % Zn (new silver, alpaca).

Copper alloys Cu with other elements - bronzes
Cu-Sn (tin bronzes) → solubility 15,8% Sn (5…20%) Cu-Sn-P (phosphor bronzes) → 0,1%P Cu-Pb (lead bronzes) → 20% Pb Cu-Al (aluminium bronzes) → 9,8% Al (~10% Al) Rm → 700 N/mm2 Cu-Si (silicon bronzes) → 5,3% Si (~3% Si) Cu-Be (beryllium bronzes) – spring bronze Rm → 1400 N/mm2 (H + AA) Typical structure of bearing material Application as plane bearing materials (as cast)

Magnesium and magnesium alloys

Magnesium (Mg) is the lightest metal.
Alloys are used in structural and non-structural applications. Typical uses of magnesium alloys are aircraft and missile components. Also has good vibration-damping characteristics.

Why ? Lowest density structural alloys 1.738 g per cm3
High specific strength Superior damping properties Excellent Castability Highly recyclable Good Machinability Good Weldability under inert atmosphere

Applications

The Mg gearbox and clutch housing unit is used with VW engines
Chevrolet Corvette C5 Z06 single-piece die-cast magnesium engine cradle by high temperature Mg alloy AE44 :33% (10.85 Kg) weight savings The Mg gearbox and clutch housing unit is used with VW engines Volkswagen Golf Mg shifter support bracket beneath the shifter that has twice the stiffness of its welded steel counterpart. Acura ZDX Mg third-row seat framing optimizes strength and functionality without adding weight. Ford explorer Mg instrument panel has improved durability and lighter weight, connecting to navigation, safety and audio systems. Ford Explorer Jeep Grand Cherokee Improvements in high-pressure die casting, Mg extrusion and twin roll cast Mg sheet technology are underway to offer for structural automotive components The global voice of the magnesium industry © 2011, International Magnesium Association

Pure Mg Tm – 649 °C Density – g/cm3 (lightest among the engineering materials) Mg-alloys Mg – Mn (up to 2,5 %) Mg – Al – Zn (up to 10 % Al, 5 % Zn)

Designation deformable (ex MgMn2) cast alloys (ex designation MCMgAl8 / material No. MC21110) Deformable Mg-alloys Mg cast alloys (EN173) Designation Rm Rp0,2 N/mm2 A % Applications MgMn2 MgAl8Zn 145 15 6 Corrosion resistant, weldable cold formable; conteiners, car , aircraft and machine manufacturing MCMgAl8Zn1 MCMgAl6 MCMgAl4Si 8 4-14 3-12 Good castability. Dynamically loadable. Car and aircraft manufacturing.

Titanium and titanium alloys

Ti-alloys, classification
Pure Ti Tm – 1660 °C Density – g/cm3 Very active to O, C, N → 2x hardnes increase Ti-alloys, classification Ti – Al – alloys (4…6 % Al) – -alloys Ti – Al – Cr, V, Cu, Mo - alloys –  + -alloys Ti – Al – Mo, Cr, Zr - alloys – -alloys

Titanium and titanium alloys
Titanium (Ti) is expensive, has high strength-to-weight ratio and corrosion resistance. Used as components for aircrafts, jet-engines, racing-cars and marine crafts.

Titanium alloys Rm N/mm2 Rpo,2 Designation HB A % Applications Ti 1…3
30-18 Weldable, machinable and cold formable. Ti1Pd, Ti2 Pd 30-22 Corrosion resistant light constructions. TiAl6V4 310 8 Machine elements in medicine, food, ZnAL11Cu1 (ZP12) 350  1050 1050 9 chemical and aircraft industry. Advantages: highest specific strength good formability Disadvantages: need for a protective atmosphere at HT (Ar) problematically casted (reacting with ladle material, ZrO2 must be used)

Current industry projections for titanium indicate
a 40 percent increase in demand by 2015.

Applications-Titanium alloys

Summary Criteria Metals and its alloys Low density Mg, Al, Ti
Low melting point Pb, Zn, Sn, Al, Mg Corrosion resistance Cu, Ni, Ti, Al Heat resistance W, Co, Ni, Cr, Mo Heat & electrical conductivity Ag, Cu, Al Antifriction properties Pb, Sn, Cu, Al (as alloy) Low neutrons reception Zr High neutron reception Cd, Hf

Aluminum Alloys

Copper Alloys

Titanium Alloys

Magnesium Alloys

How the materials usage has changed over the years

Steel Processing and applications
Supplementary slides Steel Processing and applications

Ferrous and Non-ferrous materials

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