Engr_Metals_Ferrous

Engr_Metals_Ferrous - MEGR 2180 MEGR 2180 Engineering...

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1 MEGR 2180 Engineering Metals MEGR 2180 Engineering Materials Metals Plastics Ceramics Composites Nonferrous Ferrous Steels Stainless steels Aluminum Copper Oxides Nitrides Carbides Glasses Glass Reinforced plastic Metal-matrix Ceramic-matrix Laminates Thermoplastics Thermosets Tool and die steels Cast Irons Titanium Tungsten Acrylics ABS Nylons Polyethylene PVC Epoxies Phenolics Polymides Rubbers Silicones Polyurethanes Elastomers Ceramics Graphite Diamond MEGR 2180 Engineering Metals • Steels and Cast Irons 100M* • Aluminum Alloys 36M Copper Alloys 1M • Copper Alloys • Nickel based Alloys <100,000 *Production volume in tons per year MEGR 2180 MEGR 2180 Engineering Metals: Steels and Cast Iron MEGR 2180 CARBON AND ALLOY STEELS • Carbon Steels – High, medium, and low carbon steels Alloy Steels • AISI – SAE Designations – The first two digits indicate the leading alloying elements, while the last two – Low alloy steels – High alloy steels • Stainless Steel • Tool and Die Steels • Cast Iron • Cast Steels digits give the nominal carbon content of the alloy in hundredths of a percent.
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2 MEGR 2180 AISI-SAE Designations for Some Steels and Their Major Alloying Elements 10xx - - - - Plain carbon steels 11xx - - - - Resulfurized carbon steels (free machining) 12xx - - - - Rephosphorized and Resulfurized carbon steels (free machining) 13xx - - - - Mn 1.75% 31xx - - - - Ni 1.25 Cr 0.65 33xx - - - - Ni 3.5 Cr 1.55 40xx - - - - Mo 0.20 or 0.25 41xx - - - - Mo 0.12 or 0.20 Cr 0.50 or 0.95 43xx - - - - Ni 1.8 Cr 0.5 or 0.8 Mo 0.25 50xx - - - - Cr 0.25, 0.40, or 0.50 51xx - - - - Cr 0.80, 0.90, 0.95, or 1.00 61xx - - - - Cr 0.60, 0.80, 0.95 The first two digits indicate the leading alloying elements, while the last two digits give the nominal carbon content of the alloy in hundredths of a percent. MEGR 2180 CARBON STEELS • Carbon Steels—10xx – Steels whose alloying elements do not exceed the limits in the table to the right Three major classes Element Max weight % C 1.00 Cu 0.60 – Three major classes • Low Carbon steels (also called mild steels) • Medium Carbon Steels • High Carbon Steels Mn 1.65 P 0.40 Si 0.60 S 0.05 MEGR 2180 Carbon Steels • Low Carbon Steel – Less than 0.2 - 0.3% carbon – Cannot be effectively heat treated –U s e s • Thin sheet steel for cars and appliances (sheet metal) • Heavy steel plates for ships • Medium Carbon Steel – 0.3 - 0.6% carbon – Heat treatment and work hardening are now effective methods for modifying mechanical properties. – Higher Strength – Gears, pylons • High Carbon Steel – More than 0.6% – Cold working is not possible – Cutting tools, springs, cutlery MEGR 2180 Figure taken from: http://www.azom.com/details.asp?ArticleID=400 Figure 1. The effect of carbon content and heat treatment on the typical properties of plain carbon steels. MEGR 2180 Alloy Steels • Low alloy steels – Less than 5% alloying elements – Low carbon content <0.3% – Main purpose of alloying elements are to increase hardenability • High alloy steels – Well over 5% alloying elements • Affect the formation of Austenite favorably – Stainless Steels – Tool Steels MEGR 2180 Stainless Steel • What makes Stainless Steel stainless?
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Engr_Metals_Ferrous - MEGR 2180 MEGR 2180 Engineering...

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