Primary Mill Fabrication
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Progress the Business and Technology of Heat Treating ® May/June 2008 • Volume 8, Number 3
An ASM International® HEATPublication TREATING PROGRESS THE BUSINESS AND TECHNOLOGY OF HEAT TREATING ® www.asminternational.org MAY/JUNE 2008 • VOLUME 8, NUMBER 3 HEAT TREATMENT OF LANDING GEAR HEAT TREAT SIMULATION MICROWAVE HEATING SM Aircraft landing gear, such as on this U.S. Navy FA18 fighter jet, must perform under severe loading conditions and in many different environments. HEAT TREATMENT OF LANDING GEAR The heat treatment of rguably, landing gear has Alloys Used perhaps the most stringent The alloys used for landing gear landing gear is a complex requirements for perform- have remained relatively constant operation requiring ance. They must perform over the past several decades. Alloys A under severe loading con- like 300M and HP9-4-30, as well as the precise control of time, ditions and in many different envi- newer alloys AF-1410 and AerMet ronments. They have complex shapes 100, are in use today on commercial temperature, and carbon and thick sections. and military aircraft. Newer alloys like control. Understanding the Alloys used in these applications Ferrium S53, a high-strength stainless must have high strengths between steel alloy, have been proposed for interaction of quenching, 260 to 300 ksi (1,792 to 2,068 MPa) landing gear applications. The typical racking, and distortion and excellent fracture toughness (up chemical compositions of these alloys to100 ksi in.1/2, or 110 MPa×m0.5). are listed in Table 1. contributes to reduced To achieve these design and per- The alloy 300M (Timken Co., distortion and residual formance goals, heat treatments Canton, Ohio; www.timken.com) is have been developed to extract the a low-alloy, vacuum-melted steel of stress. -
Society, Materials, and the Environment: the Case of Steel
metals Review Society, Materials, and the Environment: The Case of Steel Jean-Pierre Birat IF Steelman, Moselle, 57280 Semécourt, France; [email protected]; Tel.: +333-8751-1117 Received: 1 February 2020; Accepted: 25 February 2020; Published: 2 March 2020 Abstract: This paper reviews the relationship between the production of steel and the environment as it stands today. It deals with raw material issues (availability, scarcity), energy resources, and generation of by-products, i.e., the circular economy, the anthropogenic iron mine, and the energy transition. The paper also deals with emissions to air (dust, Particulate Matter, heavy metals, Persistant Organics Pollutants), water, and soil, i.e., with toxicity, ecotoxicity, epidemiology, and health issues, but also greenhouse gas emissions, i.e., climate change. The loss of biodiversity is also mentioned. All these topics are analyzed with historical hindsight and the present understanding of their physics and chemistry is discussed, stressing areas where knowledge is still lacking. In the face of all these issues, technological solutions were sought to alleviate their effects: many areas are presently satisfactorily handled (the circular economy—a historical’ practice in the case of steel, energy conservation, air/water/soil emissions) and in line with present environmental regulations; on the other hand, there are important hanging issues, such as the generation of mine tailings (and tailings dam failures), the emissions of greenhouse gases (the steel industry plans to become carbon-neutral by 2050, at least in the EU), and the emission of fine PM, which WHO correlates with premature deaths. Moreover, present regulatory levels of emissions will necessarily become much stricter. -
Schoolcraft Blast Furnace
Pictured Rocks National Lakeshore Schoolcraft National Park Service U.S. Department of the Interior Blast Furnace Schoolcraft furnace With surveyor William Burt’s discovery of iron ore near Teal Lake in Marquette County in 1844, Michigan’s Upper Peninsula suddenly became a hub of activity. The discovery led to construction of a vast mining and manufacturing industry using forges and blast furnaces. When the Civil War ended, many of the South’s furnaces had been destroyed by the war. Westward expansion was occurring across the plains and demand for iron boomed. It was during this era that many of the Upper Peninsula’s furnaces were constructed. There were advantages to smelting iron ore from charcoal fires. Iron produced in this manner was low in carbon content, making it highly fusable, strong, malleable and able to withstand shocks without cracking. The iron made fine wagon rims, horseshoes, and railroad wheels. Before the boom times were over, 29 separate furnaces were located on the Old Munising, ca. 1870 peninsula, though not all operated simultaneously. The business of iron making required more capital than was readily available in the area and financing and management of the operations was often complex. The first group of investors were from Philadelphia. They wished to develop a resort village on Munising Bay’s east shoreline in 1850. Some 87,000 acres of timber were purchased for $.85 an acre. A village was platted on the east shore of Munising Bay, lots were sold, and a dock was built. Henry Mather and Peter White acted as agents for the group of investors who created the Schoolcraft Iron Company in 1866. -
Higher-Quality Electric-Arc Furnace Steel
ACADEMIC PULSE Higher-Quality Electric-Arc Furnace Steel teelmakers have traditionally viewed Research Continues to Improve the electric arc furnaces (EAFs) as unsuitable Quality of Steel for producing steel with the highest- Even with continued improvements to the Squality surface finish because the process design of steelmaking processes, the steelmaking uses recycled steel instead of fresh iron. With over research community has focused their attention 100 years of processing improvements, however, on the fundamental materials used in steelmaking EAFs have become an efficient and reliable in order to improve the quality of steel. In my lab steelmaking alternative to integrated steelmaking. In at Carnegie Mellon University, we have several fact, steel produced in a modern-day EAF is often research projects that deal with controlling the DR. P. BILLCHRIS MAYER PISTORIUS indistinguishable from what is produced with the impurity concentration and chemical quality of POSCOManaging Professor Editorof Materials integrated blast-furnace/oxygen-steelmaking route. steel produced in EAFs. Science412-306-4350 and Engineering [email protected] Mellon University Improvements in design, coupled with research For example, we recently used mathematical developments in metallurgy, mean high-quality steel modeling to explore ways to control produced quickly and energy-efficiently. phosphorus. Careful regulation of temperature, slag and stirring are needed to produce low- Not Your (Great-) Grandparent’s EAF phosphorus steel. We analyzed data from Especially since the mid-1990s, there have been operating furnaces and found that, in many significant improvements in the design of EAFs, cases, the phosphorus removal reaction could which allow for better-functioning burners and a proceed further. -
5. Sirhowy Ironworks
Great Archaeological Sites in Blaenau Gwent 5. SIRHOWY IRONWORKS There were a number of ironworks in the area now covered by Blaenau Gwent County Borough, which provided all the raw materials they needed – iron ore, limestone and fuel, charcoal at first but later coal to make coke. The Sirhowy ironworks (SO14301010) are the only one where there is still something to see. The works were opened in 1778 with one blast furnace. Although it was originally blown by water power, in 1799 the owners invested in a Boulton and Watt steam engine. This gave them enough power to blow a second furnace, which started production in 1802. In the early years of the 19th century, the pig iron produced at Sirhowy was sent to the Tredegar works a little further down the valley where it was refined, until 1818 when the Sirhowy works were sold and started to send its pig iron to Ebbw Vale. A third furnace was added in 1826 and a fourth in 1839. But by the 1870s iron smelting at Sirhowy was no longer profitable, and the works finally closed in 1882. Like all ironworks in South Wales, the furnaces were built against a steep bank which enabled the ironworkers to load the charge of iron ore, limestone and coke or charcoal fuel more easily at the top of the furnace. All that is now left now are the remains of a bank of blast furnaces with the arches that would originally have linked them to the casting houses in front, and the building that originally housed the waterwheel. -
National Register of Historic Places Multiple Property
NFS Form 10-900-b 0MB No. 1024-0018 (Jan. 1987) United States Department of the Interior National Park Service National Register of Historic Places Multipler Propertyr ' Documentation Form NATIONAL This form is for use in documenting multiple property groups relating to one or several historic contexts. See instructions in Guidelines for Completing National Register Forms (National Register Bulletin 16). Complete each item by marking "x" in the appropriate box or by entering the requested information. For additional space use continuation sheets (Form 10-900-a). Type all entries. A. Name of Multiple Property Listing ____Iron and Steel Resources of Pennsylvania, 1716-1945_______________ B. Associated Historic Contexts_____________________________ ~ ___Pennsylvania Iron and Steel Industry. 1716-1945_________________ C. Geographical Data Commonwealth of Pennsylvania continuation sheet D. Certification As the designated authority under the National Historic Preservation Act of 1966, as amended, J hereby certify that this documentation form meets the National Register documentation standards and sets forth requirements for the listing of related properties consistent with the National Register criteria. This submission meets the procedural and professional requiremerytS\set forth iri36JCFR PafrfsBOfcyid the Secretary of the Interior's Standards for Planning and Evaluation. Signature of certifying official Date / Brent D. Glass Pennsylvania Historical & Museum Commission State or Federal agency and bureau I, hereby, certify that this multiple -
Three Hundred Years of Assaying American Iron and Iron Ores
Bull. Hist. Chem, 17/18 (1995) 41 THREE HUNDRED YEARS OF ASSAYING AMERICAN IRON AND IRON ORES Kvn K. Oln, WthArt It can reasonably be argued that of all of the industries factors were behind this development; increased pro- that made the modern world possible, iron and steel cess sophistication, a better understanding of how im- making holds a pivotal place. Without ferrous metals purities affected iron quality, increased capital costs, and technology, much of the modem world simply would a generation of chemically trained metallurgists enter- not exist. As the American iron industry grew from the ing the industry. This paper describes the major advances isolated iron plantations of the colonial era to the com- in analytical development. It also describes how the plex steel mills of today, the science of assaying played 19th century iron industry serves as a model for the way a critical role. The assayer gave the iron maker valu- an expanding industry comes to rely on analytical data able guidance in the quest for ever improving quality for process control. and by 1900 had laid down a theoretical foundation for the triumphs of steel in our own century. 1500's to 1800 Yet little is known about the assayer and how his By the mid 1500's the operating principles of assay labo- abilities were used by industry. Much has been written ratories were understood and set forth in the metallurgi- about the ironmaster and the furnace workers. Docents cal literature. Agricola's Mtll (1556), in period dress host historic ironmaking sites and inter- Biringuccio's rthn (1540), and the pret the lives of housewives, miners, molders, clerks, rbrbühln (Assaying Booklet, anon. -
Henry Bessemer and the Mass Production of Steel
Henry Bessemer and the Mass Production of Steel Englishmen, Sir Henry Bessemer (1813-1898) invented the first process for mass-producing steel inexpensively, essential to the development of skyscrapers. Modern steel is made using technology based on Bessemer's process. Bessemer was knighted in 1879 for his contribution to science. The "Bessemer Process" for mass-producing steel, was named after Bessemer. Bessemer's famous one-step process for producing cheap, high-quality steel made it possible for engineers to envision transcontinental railroads, sky-scraping office towers, bay- spanning bridges, unsinkable ships, and mass-produced horseless carriages. The key principle is removal of impurities from the iron by oxidation with air being blown through the molten iron. The oxidation also raises the temperature of the iron mass and keeps it molten. In the U.S., where natural resources and risk-taking investors were abundant, giant Bessemer steel mills sprung up to drive the expanding nation's rise as a dominant world economic and industrial leader. Why Steel? Steel is the most widely used of all metals, with uses ranging from concrete reinforcement in highways and in high-rise buildings to automobiles, aircraft, and vehicles in space. Steel is more ductile (able to deform without breakage) and durable than cast iron and is generally forged, rolled, or drawn into various shapes. The Bessemer process revolutionized steel manufacture by decreasing its cost. The process also decreased the labor requirements for steel-making. Prior to its introduction, steel was far too expensive to make bridges or the framework for buildings and thus wrought iron had been used throughout the Industrial Revolution. -
Studying and Improving Blast Furnace Cast Iron Quality
Т. К. BALGABEKOV, D. K. ISSIN, B. M. KIMANOV, A. Z. ISSAGULOV, ISSN 0543-5846 ZH. D. ZHOLDUBAYEVA, А. Z. AKASHEV, B. D. ISSIN METABK 53(4) 556-558 (2014) UDC – UDK 669.162.2:669.1:669.13=111 STUDYING AND IMPROVING BLAST FURNACE CAST IRON QUALITY Received – Prispjelo: 2013-11-09 Accepted – Prihvaćeno: 2014-04-30 Preliminary Note – Prethodno priopćenje In the article there are presented the results of studies to improve the quality of blast furnace cast iron. It was estab- lished that using fire clay suspension for increasing the mould covering heat conductivity improves significantly pig iron salable condition and filtration refining method decreases iron contamination by nonmetallic inclusions by 50 – 70 %. Key words: blast furnace, cast iron, fire clay, filter, filtering elements INTRODUCTION tically contain water after mould drying with coke gas. Therefore, pig iron salable condition improves signifi- With the development of motor transport industry, cantly. machine-tool building and other machine building Besides, the use of fire clay for mould coverings ex- branches there increased the requirements to the quality cludes claps in dissolution and prevents the lime solu- of blast furnace cast iron. With the use in the cupola tion corroding action when split on the open parts of the mixture of cast iron melted in large-volume furnaces worker’s body, increases the culture of production and with the melting progressive parameters, at machine decreases labor intensity when making solution, as there building plants there became often defective castings is excluded the waste presence up to 30 – 40 % in the with shrinkage defects, friability, cracks. -
Blast Furnace
RECOMMENDED GUIDELINE FOR IRON & STEEL SECTOR MINISTRY OF STEEL, Doc. No: RG / 04 GOVT. OF INDIA BLAST Rev no.: 00 FURNACE Effective Date: -- 1. OBJECTIVE Blast furnace produces Hot metal (Liquid Iron) using Iron ore, Coke, Sinter, Pellets and fluxes such as Lime-stone, Pyroxenite, Quartzite reacting with oxygen from pre heated air. This entire process of production of hot metal is associated with various safety hazards like hit / entanglement with mobile equipment, burns, fire, slip & fall, exposure to dust, smoke, noise, heat & gas etc. 2. SCOPE This code of safety is applicable to Blast furnace Dept. of an Integrated Steel Plant. 3. PROCESS In the Blast Furnaces (BF) liquid iron (popularly termed as ‘Hot Metal’) is produced by the process of reduction at high temperature from raw materials like iron ore, base mix, sinter, coke, fluxes (limestone / quartzite), etc. &also air blast / O2. In blast furnace the process is also known as “Counter current process” as solid raw material is being charged from the top and hot air is being blown from bottom. During the process the impurities are removed in the form of slag and hot metal is produced. Coal is being injected to reduce consumption of main fuel coke which is a cost reduction measure. Liquid metal and slag are being separated in the area known as cast house. The liquid Hot Metal is transported in Hot Metal Ladles / Torpedoes to the Steel Melting Shops (SMS) for the production of steel by the process of oxidation of the Hot Metal in specially designed Convertors. Sometimes the Hot Metal is poured in the Pig Casting Machine (PCM) to produce Pig Iron. -
Development of Low-Cost Casting Titanium Alloys: an Integrated Computational
Development of Low-cost Casting Titanium Alloys: An Integrated Computational Materials Engineering (ICME) Guided Study Dissertation Presented in Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy in the Graduate School of The Ohio State University By Zhi Liang Graduate Program in Materials Science and Engineering The Ohio State University 2018 Dissertation Committee Professor Alan A. Luo, Advisor Professor Glenn Daehn Professor Ji-cheng Zhao Copyrighted by Zhi Liang 2018 Abstract Titanium alloys have proved to be important lightweight structural materials since 1960’s, due to their excellent intermediate temperature mechanical properties, corrosion resistance and weldability. Their good property-to-weight ratios make them ideal for many high-end and weight-sensitive applications. However, the application of titanium alloys is still limited due to the high costs in raw materials and manufacturing, indicating the importance of developing new cost-effective titanium alloys. Compared with other lightweight structural alloys (e.g. aluminum, magnesium), the raw material cost for titanium alloys is generally considered as expensive due to its expensive alloying elements such as vanadium, molybdenum, and tin. The cost issue is further amplified by the difficulties in using conventional machining methods for component-shaping due to the low thermal conductivity. Therefore, cost-effective titanium alloys should address either aspect. This work focuses on the goal of developing new cost-effective Ti-Al-Fe- Mn titanium alloys for the casting process via Integrated Computational Materials Engineering (ICME) approach by using cheaper alloying elements and net-shape manufacture process. Calculation of Phase Diagram (CALPHAD) work on the Ti-Al-Mn ternary system was conducted to establish the reliable thermodynamic database to guide the alloy design. -
Effect of Compound Jacketing Rolling on Microstructure and Mechanical
EFFECT OF COMPOUND JACKETING ROLLING ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF SUPERALLOY GH4720Li Jinglong Qu 1, Minqing Wang 1, Jianxin Dong 2, Guilin Wu 3, Ji Zhang 1 1 Central Iron and Steel Research Institute, Superalloy Department, No.76, Xueyuan Nanlu, Beijing, 100081, China 2 University of Science and Technology Beijing, Department of Materials Science and Technology, No.30, Xueyuan Lu, Beijing, 100083,China 3 Northeast Special Steel Group Co., Ltd., Liaoning Fushun, 113001, China Keywords: GH4720Li Alloy, Compound Jacketed Rolling, Microstructure, γ′ phase Abstract In this paper, a compound jacketed rolling technique for superalloy GH4720Li is experimentally investigated. The results show that microstructure of GH4720Li is susceptible to hot working parameters. When rolling temperature is about 1130ºC, a fine-grained microstructure, excellent mechanical properties and high yield strength can be obtained. In addition, the rolling temperature can be controlled effectively, friction force between ingot and roller can be reduced, surface cracking induced by rolling can be avoided, and uniform microstructure can be obtained using compound jacketing. When accumulative strain of rolling is greater than 65%, the coarse columnar dendritic microstructure can be refined completely and grain size of ASTM 8 obtained. After heat treatment, GH4720Li bars exhibit excellent mechanical properties. Introduction GH4720Li is a high strength and difficult-to-deform superalloy with excellent mechanical, corrosion resistant and oxidation resistant properties. It is now widely used in aircraft and land-based turbine discs. In practice, the temperature required for a long-term use of GH4720Li is below 700 °C. The weight percent of Al+Ti is as high as 7.5%, and the amount of γ′ strengthening phase is as high as 40%.