Material hardness and hardness testing...

Material hardness and hardness testing Material hardness is the property of the material which enables it to resist plastic deformation, usually by penetration or by indentation. The term of hardness is also referred to stiffness or temper, or to resistance to bending, scratching, abrasion, or cutting. It is the property of a material, which gives it the ability to resist being permanently, deformed when a load is applied. The greater the hardness of the material, the greater the resistance it has to deformation. Hardness has been variously defined as resistance to local penetration, scratching, machining, wear or abrasion, and yielding. The multiplicity of definitions, and corresponding multiplicity of hardness measuring instruments, together with the lack of a fundamental definition, indicates that hardness may not be a fundamental property of a material, but rather a composite one including yield strength, work hardening, true tensile strength, modulus of elasticity, and others. In mineralogy, hardness is normally described as the resistance of a material to being scratched by another material. The ability of materials to resist scratching by another material can be ranked by referring to the Mohs scale which assesses relative hardness of the materials. In metallurgy hardness is defined as the ability of a material to resist plastic deformation. It is sometimes known as indentation hardness which is the resistance of a material to indentation. The usual type of hardness test is where a pointed or rounded indenter is pressed into a surface of the material under a substantially static load. Hardness measurement can be carried out at macro scale, micro scale or nano scale according to the forces applied and displacements obtained. Measurement of the macro hardness of the material is a quick and simple method of finding mechanical property data for the bulk...

Managers and their Role in the Organization...

Managers and their Role in the Organization Managers are the life of an organization. They are to ensure that the organization performs to the expectation and achieves its purpose and goals. For doing this, managers are to perform certain roles and duties, which include organizing, controlling, directing, coordinating, and leading. Managers may be the entrepreneurs, sometimes they may not be, but however, at all the times they are to balance the available resources of the organization for the achievement of the organizational goals and objectives. For the managers to carry out these duties, they have to possess certain skills which include inter-personal skill, people skill, conceptual skill, and technical skill etc. A manager is often defined as someone who coordinates and oversees the work of other employees so that the organizational goals can be accomplished. It is not about personal achievement but helping others do their job. Managers may also have additional work duties which are not related to coordinating the work of others. Manager is a job title which is used in organizations to denote an employee who has certain responsibilities to lead some functions or departments and/or employees. He has a level in the organizational structure which integrates functions and departments for implementation of the management decisions and for the achievement of the organizational goals and objectives. He is a person responsible for planning and directing the work of a group of individual employees, monitoring their work, and taking corrective action when necessary. He is normally assigned a particular level in the organizational chart and usually has diverse responsibilities for the employees and the functions. The job description of a manager varies from organization to organization. Usually the manager is responsible for a department and has direct reporting employees for whom he has leadership responsibility. Though manager is a job title,...

Wire and Rod Drawing Process for Steel Nov13

Wire and Rod Drawing Process for Steel...

Wire and Rod Drawing Process for Steel Drawing of wire from steel rod is a metal working process used for the reduction of the cross-section of the rod. Similarly rods are drawn from steel rounds of larger diameters. During drawing the volume remains the same and hence there is increased in the length of the drawn wire or rod. It is carried out by pulling the wire/rod through a single or a series of the drawing dies. In the case of series of drawing dies, the subsequent drawing die is to have smaller bore diameter than the previous drawing die. Drawing is usually performed in round sections at room temperature, thus it is classified as a cold working process. However, it can be performed at higher temperatures for large wires to reduce forces. Drawing process normally is most frequently used to produce round cross sections, but squares and other shapes can also be drawn. Wire/rod drawing is an important industrial process, providing commercial products. Rod and wire products cover a very wide range of applications which include shafts for power transmission, machine and structural components, blanks for bolts and rivets, electrical wiring, cables, wire stock for fences, rod stock to produce nails, screws, rivets, springs and many others. Drawing of rods from steel rounds is used to produce rods for machining, forging, and other processes etc. Advantages of drawing in the above applications include (i) close dimensional control, (ii) good surface finish, (iii) improved mechanical properties such as strength and hardness, and (iv) adaptability to economical batch or mass production. In the process of drawing, the cross section of a long rod or wire is reduced or changed by pulling (hence the term drawing) it through a die called a draw die. Pulling of rod...

Steels and Cast irons and their Essential and Incidental Elements...

Steels and Cast irons and their Essential and Incidental Elements Steels and cast irons are basically alloys of iron and different other elements in the periodic table. The vast majority of steels and all cast irons contain carbon as a principal alloying element. As a general definition, steel is an alloy of iron, carbon (less than 2 % C), and other alloying elements which is capable of being hot and/or cold deformed into various shapes. On the other hand, cast iron is an alloy of iron, carbon (higher than 2 % C), and other alloying elements and is not generally capable of being hot and/or cold deformed. A cast iron is used in its cast form. Steels and cast irons are the most widely used and least expensive metallic materials. There are several thousands of different steel compositions presently available. A vast variety of terminology is used to differentiate different types of steels. In fact, the way the steels are classified sometimes is quite confusing even to the regular user of steels. However, in many cases, the steels fall into a limited number of well-defined classes. Generally, the carbon and low alloy steels come under a classification system based on composition. The high alloy steels (the stainless, heat resistant, and wear resistant steels, etc.) are being classified according to many different systems, including composition, microstructure, application, or specification. The easiest way to classify steels is by their chemical composition. Different alloying elements are normally added to iron for the purpose of attaining certain specific properties and characteristics. These elements include, but are not limited to, carbon, manganese, silicon, nickel, chromium, molybdenum, vanadium, niobium, copper, aluminum, titanium, tungsten, and cobalt. The general category of carbon and low alloy steels encompasses plain carbon steels, alloy steels,...

Operational Discipline in Steel Industry...

Operational Discipline in Steel Industry Operational discipline means complying with a set of ‘well thought out’ and ‘well defined’ processes, and consistently executing them correctly. Striving to achieve operational excellence is one of the most important contributors to the steel industry’s sustainable performance and growth. Steel organization which reach for a higher level of operational excellence reap numerous benefits namely (i) a systemic, evolving and effective approach to its operations (ii) a continually productive and innovative workforce, and (iii) an organization which consistently achieves sustainable growth and increasing valuation. It is not uncommon to confuse operational discipline with operational excellence. While the two are closely linked, yet the latter cannot be realized without the former.  Operational discipline is but one important component among others which one can find on the path of the operational excellence. DuPont defines operational discipline as ‘the deeply rooted dedication and commitment by every member of an organization to carry out each task the right way every time’. In short, operational discipline can be stated as ‘everyone in the organization doing it right every time’. It means complying with a set of well thought out and well defined processes, and consistently executing them correctly. It is an essential ingredient when trying to achieve operational excellence. Operational discipline provides an organized and systematic way to complete tasks and implement operational changes through a fundamental set of procedures which are specific to the steel organization’s unique product. Regardless of the final products of the steel plant, operational discipline increases reliability and decreases the risk of the occurrence of a high magnitude incident. This is much easier said than done. However, building a culture in the organization around the pillars of operational discipline is the most effective way towards the achievement of this...