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MET 34800 - Engineering Materials Chapter 14

MET 34800 - Engineering Materials Chapter 14 - MET 34800...

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Unformatted text preview: MET 34800 – ENGINEERING MATERIALS IUPUI ENGINEERING TECHNOLOGY ENT Department CHAPTER 14 CARBON AND ALLOY STEELS Engineering Materials: properties and selection, 9th ed. Kenneth G. Budinski, Michael K. Budinski Upon completion of this chapter, the student should: have an understanding of how finishing and alloy additions alter steel properties. have a knowledge of identification systems used on carbon and alloy steels. have an understanding of the differences among various carbon and alloy steels and development of a repertoire of steels for general use in design. CHAPTER GOALS 3 Carbon steel Alloy steel HSLA Mill heat treated Ultra-high strength TERMINOLOGY 4 Steels for machine design – spectrum Carbon steels 1XXX Alloy steels 2XXX to 9XXX ASTM steels UNS designation 14.1 ALLOY DESIGNATIONS 5 14.1 ALLOY DESIGNATIONS 6 Table 14–1 Major groups in the SAE steel designation system 14.1 ALLOY DESIGNATIONS 7 Table 14–2 Letter prefixes and suffixes in steel identification 14.1 ALLOY DESIGNATIONS 8 Table 14–3 Outline of the Unified Numbering System for metals 14.1 ALLOY DESIGNATIONS 9 Cold finished Mechanism of cold work Effect on mechanical properties Formability of tempers Available grades Hot finished Grades Hardening Hardenability concerns Hardenable grades Welding Physical properties 14.2 CARBON STEELS 10 Figure 14–2 Curve abg is the room temperature stress– strain curve for a ductile steel. Curve abc is the true stress–strain curve for the same steel. Curve ad is the true stress–strain curve for a ceramic. Curve aef is the true stress–strain curve for a steel at hot- working temperatures. 14.2 CARBON STEELS 11 Figure 14–3 Effect of mechanical working on the properties of iron Source: L. H. Van Vlack, Elements of Material Science, Reading, MA: Addison- Wesley Publishing Co., Inc., 1959 14.2 CARBON STEELS 12 Table 14–4 Mechanical properties of carbon steel strip with maximum 0.25% carbon 14.2 CARBON STEELS 13 Figure 14–4 Formability of various tempers of 0.25 C max steel strip Source: Steel Products Manual— Carbon Steel Strip, © American Iron and Steel Institute, New York, 1971 14.2 CARBON STEELS 14 Figure 14–5 Surface finish of (a) hot-rolled and (b) cold-rolled 1020 steel plate 14.2 CARBON STEELS 15 Table 14–5 Different qualities of cold-rolled steel sheet (AISI) 14.2 CARBON STEELS 16 Table 14–6 Tempers available on tin mill steels 14.2 CARBON STEELS 17 Figure 14–6 Mechanical properties of construction steels 14.2 CARBON STEELS 18 Table 14–7 Different qualities of hot-rolled steel sheet 14.2 CARBON STEELS 19...
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MET 34800 - Engineering Materials Chapter 14 - MET 34800...

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