National Institute of Technology Rourkela

राष्ट्रीय प्रौद्योगिकी संस्थान राउरकेला

ଜାତୀୟ ପ୍ରଯୁକ୍ତି ପ୍ରତିଷ୍ଠାନ ରାଉରକେଲା

An Institute of National Importance

Syllabus

Course Details

Subject {L-T-P / C} : MM4108 : Stainless steel Technologies { 3-0-0 / 3}

Subject Nature : Theory

Coordinator : Prof. Kumud Kant Mehta

Syllabus

Introduction: Definition, Alloying elements in Stainless Steels and their functions. Effect of alloying elements on properties of Stainless Steels. Classification of Stainless Steels. Cost implications of alloy additions and substitutes. Stainless-steel production in India and all over the world. 06 Hrs

Making and Processing: Final Annealing and Pickling, Skin Pass Mill, Strip Grinding Line. Finishing of Stainless Steels. Colour Coating of Stainless Steels.Special melting technique for stainless steel, Hot and cold working of stainless steel, Final processing of heat treatable and non-heat treatable stainless steel. 06 Hrs

Phase Transformations and Heat treatments: Relevance of Nickel equivalent and Chromium equivalent, The Schaeffler–Delong diagram, Role of alloying elements in ferrite and austenite stabilisation, Role of deformation on phase transformation. Heat treatment of stainless steels-ferritic, martensitic, austenitic, duplex, precipitation hardenable, Ti- and Nb- stabilized grade stainless steels. Precipitation reaction in stainless steels, high temperature (475°C) embrittlement, carbide and nitride precipitation. 08 Hrs

Mechanical Behaviour and Properties: Deformation behaviour of stainless steel. Role of precipitates on mechanical properties. Mechanical properties of different grades of stainless steels-tensile, hardness, impact, fatigue. 04 Hrs

Fabrication:Specific difficulties associated with welding of – Martensitic-, Ferritic-, Austenitic-, Duplex, Precipitation Hardened-, Martensitic, Semiaustenitic-, Austenitic- precipitation hardened stainless steels. Welding of dissimilar metal combinations with stainless steels. Sensitization/Weld decay: Causes, mechanisms, remedies, High temperature sensitization, 475oC embrittlement, a' phase transformation, Distortion-Causes, mechanisms, remedies, Effect of alloying elements on weldability of Stainless Steels, Schaeffler De Long diagram interpretations. Tools and Equipment. Issues faced during fabrication of stainless steels and its solutions. 08 Hrs

Testing, Handling and Storage of Stainless steel: PMI technique, XRF, Surface Reflectivity measurement, Recommended procedures for storage. 2 Hrs

Corrosion: Microbiologically Induced Corrosion (MIC), Different corrosion testing procedures (Laboratory tests including salt spray test, Pilot plant test, service tests and field tests). Role of precipitates on corrosion, Inhibitors for corrosion prevention, corrosion resistance of stainless steels. 6 Hrs

Applications: Automotive, Railways & Transport, Architecture, Building & Construction, Reinforcement bars, Roofing sheets, utensils, Furniture, Material Handling applications, Process Industries, Biomedical applications. Life Cycle Cost Analysis. 2 hrs

Plant visit: Stainless steel industry visit in a company like Jindal Stainless.

Course Objectives

  • To craft the practical scenario among the undergraduate students about steel and stainless steel making at shop floor in Indian steel industries along with the phase transformation aspect.
  • To improve the general understanding of testing of steels including mechanical and corrosion behavior.
  • To develop the general cognizant about the use of stainless steel in different Indian manufacturing sectors.
  • To bridge the gap of institute and industry aspects through interaction with Industry experts.

Course Outcomes

Students will achieve the industrial acumen of the basic aspects of stainless steel making and treating. The outcomes are as follows: <br /> <br />CO1 <br />The undergraduate students will get idea of making, processing, storage and application of different types of stainless steel. <br /> <br />CO2 <br />Students will develop in-depth understanding about the heat treatment, phase transformation and precipitation reactions associated with stainless steels. <br /> <br />CO3 <br />Students will acquire the comprehensive knowledge about different types of stainless steels, their compositions and characteristics. <br /> <br />CO4 <br />Students will acquire idea about the mechanical behaviour of different types of stainless steels and their deformation mechanisms. They will also understand the high temperature characteristics of stainless steels. <br /> <br />CO5 <br />Students will know about the fabrications processes related to stainless steels and associated difficulties. <br /> <br />CO6 <br />Students will understand the corrosion resistance properties and associated mechanism of stainless steels.

Essential Reading

  • E. T. Turkdogan, Fundamental of Steelmaking, The Institute of Materials, , London, 1996.
  • Brahma Deo and Rob Boom, Fundamentals of Steelmaking Metallurgy, Prentice-Hall International , 1993

Supplementary Reading

  • F B Pickering, Physical metallurgy of Stainless Steel Development, International Materials Reviews, Volume 21, ASM International , 1976
  • Bela Leffler, Stainless Steel and Their Properties, Outokumpu , 2013