Degeneration of steel that increases hardness and strength while decreasing ductility. This process normally follows rapid cooling or cold working.
AlSl (American Iron and Steel Institute]
A North American trade association with 50 member companies and over 100 associate members. These companies represent the United States, Canada, and Mexico in all aspects of the steel industry.
The adding of any metallic element in steel production in order to increase hardness, strength, or corrosion resistance. Molybdenum, nickel, and chromium are
common alloying elements in stainless steel.
Steel that contains more than 1.65% manganese, 5% silicon, 6% copper, or other minimum quantities of alloys such as chromium, molybdenum, nickel, or tungsten.
The producer's selling price plus a surcharge added to offset the increasing costs of raw materials caused by increasing alloy prices.
A process of heating cold steel to make it more suitable for bending and shaping and prevents breaking and cracking. Batch Box annealing consists of heating coils for days in an oxygen-free environment. Continuous annealing consists of running the coils through heated vertical loops to obtain certain physical properties.
Polarisation to a more oxidising potential to achieve a reduced corrosion rate by the promotion of passivity.
Argon-Oxygen Decarburisation [AOD]
A process of further reducing the carbon content of stainless steel during reﬁnement. AOD is closely related to Electric Arc Furnaces (EAF), but has a shorter operating time and requires lower temperatures.
Non-magnetic steels that contain nickel and 18% chromium to increase the resistance to corrosion. Austenitic steels are the most widely used category of steel.
Automatic Gauge Control
A hydraulic roll force system where steel makers can monitor a steel sheet’s thickness while it moves through the mill at over 50 mph (80 km/h). The computer's
gap sensor adjusts and monitors the thickness 50 to 60 times per second.
Steel formed into long shapes from billets. Merchant bar and reinforcing bar are two kinds of bars.
Long pieces of squared-off metal, normally steel, which are used in building construction.
Tests used to assess the ductility and malleability of steel when subjected to bending.
A semi-finished form of steel that is used for long products such as bars and channels. Billets are normally two to seven inches square.
A tall cylindrical furnace lined with heat - resistant bricks that smelts iron from iron ore. Hot air and gases are blasted from the iron ore, coke, and limestone that fuel the furnace.
A section of sheet steel that has the outer dimensions of a speciﬁc part but has not yet been stamped by the end user. This lowers steel processor's labour and transportation costs.
A semi-finished form of steel, whose cross - section is more than eight inches, that will be further processed into beams, rods, bars, or tubing products.
A fracture that has little or no plastic deformation.
A subtle ridge on the edge of strip steel resulting from cutting operations such as slitting, trimming, shearing, or blanking. For example, as a steel processor trims the sides of the sheet steel parallel or cuts a sheet of steel into strips, its edges will bend with the direction of the cut.
The standard pipe used in plumbing. Heated skelp is passed continuously through welding rolls, which form the tube and squeeze the hot edges together to make a solid weld.
Steel that is composed mostly of carbon and relies on it for its structure. It is the most widely produced steel.
Hardening a ferrous alloy to make the outside (case) much harder than the inside (core). This can be done carburising, cyaniding, nitriding, carbonitriding, induction hardening, and ﬂame hardening.
Corrosion of a cathode due to hydrogen pick up.
A chemical substance that prevents or slows a cathodic or reduction reaction.
Reducing the corrosion of a metal by making the particular surface a cathode of an electrochemical cell.
The rapid formation and depletion of air bubbles that can damage the material at the solid/liquid interface under conditions of severe turbulent flow.
A chemical coating normally applied to the steel surface to resist oxide formation and corrosion.
The act of loading material into a furnace. For example, iron ore, coke and limestone are charged into a Blast Furnace; a Basic Oxygen Furnace is charged with scrap and
Chloride Stress Corrosion Cracking
Cracking due to the combination of tensile stress and corrosion in the presence of water and chlorides.
An alloying element that is used in stainless steel to deter corrosion.
Application of a stainless steel coating to a lower-alloy steel by means of pouring, welding, or coating to increase corrosion resistance at a lower cost than using
stainless steel exclusively.
A sheet of steel that has been rolled to facilitate transportation and storage.
A processed form of coal that is used as fuel in blast furnaces in the smelting of iron. Burning steadily and thoroughly, coke is very dense and will not collapse from the weight of the iron ore.
Coke Oven Battery
A combination of ovens that process coal into coke. These batteries are often the dirtiest part of a steel mill due to the exhaust fumes and emissions.
Process of rolling cold coils of pickled hot-rolled sheet through a press to make the steel stronger, thinner, and smoother by applying pressure.
Cold-Rolled Strip [Sheet]
Pickled sheet steel that has been run through a cold-reduction mill. It has a width of approximately 12 inches while a sheet may be more than 80 inches wide. Cold-rolled steel is thinner and stronger than hot-rolled sheet and is more expensive.
Cold-Finished Steel bars
Hot-rolled carbon steel bars with a higher surface quality and strength produced from secondary cold-reduction.
Cold Working [Rolling]
Changing the structure and shape of steel by rolling, hammering, or stretching the steel at room temperature to increase the hardness and strength of the steel.
The physical use of steel by end users. Consumption predicts changes in inventories, unlike demand ﬁgures.
Processes of pouring steel into a billet, bloom, or slab directly from the furnace. This process avoids the need for large, expensive mills and also saves time because the slabs solidify in minutes rather than the several hours it takes for an ingot to form.
Steel customers demanding steel in a more ﬁnished state such as tubing, pipe, and cold-rolled strip from rerollers and tube makers. This steel is generally not contracted, causing the converter segment of the steel mill’s revenues more price sensitive than their supply contracts to auto manufacturers.
The natural degradation of steel due to atmospheric conditions or other factors.
Cracking due to repeating and ﬂuctuating stresses in a corrosive environment.
The potential of a corroding surface in an electrolyte relative to a reference electrode under open-circuit conditions.
The rate at which an object corrodes.
A metal’s ability to resist corrosion in a particular environment.
Strain caused by stress that occurs over time.
Corrosion of a metal surface that is fully shielded from the environment but corrodes because it is so close to the surface of another metal.
Critical Pitting Potential
The lowest value of oxidising potential at which pits can form and grow. The value depends on the test method used.
Cutting ﬂat-rolled steel into a desired length and then normally shipped ﬂat-stacked.
Removing the subtle ridge from the edge of strip metal that results from cutting operation such as slitting, trimming, shearing, or blanking.
The removal of sulphur from a ladle full of hot metal via chemical injection before it is charged into the basic Oxygen Furnace. This is done because sulphur reduces welding and forming capabilities.
The principal processes for casting near net shapes of non-ferrous metals such as zinc, aluminium, and zinc-aluminium alloy.
To produce specialty tubing, this procedure uses a drawbench to pull tubing through a die and over a mandrel, allowing excellent control of the inside diameter and wall thickness. These specialty tubes are marketed mainly to automotive markets and for hydraulic cylinders.
A seamless pipe used to drill an oil or gas well. Drill pipe is the conduit between the wellhead motor and the drill bit.
The ability of steel to be formed, shaped, or altered permanently at room temperature without being damaged.
Stainless steel comprised of austenitic and ferritic steels that contain high amounts of chromium and nickel. This combination is stronger than both of the individual steels. Duplex steels are highly resistant to corrosion and cracking and are often used in heat exchangers, destination plants, and marine applications.
Edge Rolling (Edge Conditioning]
To facilitate customer manipulation, strips of steel are rolled to smooth the edges and remove any burrs.
Electric Arc Furnace [EAF]
A steel producing furnace where scrap generally makes up 100% of the charge. Heat is supplied from electricity that arcs from the electrodes to the metal bath. These furnaces may operate on AC or DC.
Electric Resistance Welded [ERW] Pipe
Pipe made from strips of hot-rolled steel, which are passed through forming rolls and welded. ERW pipe technology is advancing and now consists of approximately 48% of OCTG shipments by tonnage.
A material's loss of malleability due to chemical treatment or physical change.
The cracking and corroding of a normally ductile material due to environmental conditions.
The continuous depletion of a material due to mechanical interaction with a liquid, a mulitcomponent ﬂuid, or solid particles carried with the ﬂuid.
An accelerated loss of material concerning corrosion and erosion that results from corrosive material interacting with the material.
A shaped piece of normally ferrous metal, produced by forcing the bloom, bar, or rod through a die of the appropriate shape.
An intermediate product producer that purchases materials and processes them speciﬁcally for a particular project.
The reduction of iron ore to iron pellets that can be loaded into an electric arc furnace with an equal amount of scrap. This process allows producers to bypass the coke oven-blast furnace route to produce hot metal from iron ore.
A condition leading to the eventual fracture of a material due to constant or repeated stresses that exert less pressure than the tensile strength of the material.
The body-centred cubic crystalline phase of iron-based alloys.
Magnetic steels that have a low carbon content and contain chromium as the main alloying element, usually between 13% and 17%. It is the second most widely used steel. Ferritic steels are generally used in automotive trim and exhaust systems, hot water tanks, and interior architectural trim.
Metal products such as ferrochrome, ferromanganese, and ferrosilicon that are commonly used as raw materials to aid various stages in steel making. Certain stages could be deoxidisation, desulphurisation, and strength adding.
A common raw material in stainless steel production. This alloy consists of iron and up to 72% chromium.
Any metal that is primarily composed of iron.
The ﬁnal condition of the surface after the last phase of production.
These facilities process semi-ﬁnished steel into ready-made forms that can be used by others. Some facilities are rolling mills, pickle lines, tandem mills, annealing facilities, and temper mills.
Category of steel that includes shapes such as sheet, strip, and tin plate.
An iron cleaning agent that consists of limestone and lime. These products react with impurities in the metallic pool and ﬂoat to the top of the liquid iron.
Metal with a maximum width of .005 inches.
Forming a hot or cold metal into a ﬁxed shape by hammering, upsetting, pressing, or rolling.
An accumulation of marine organism deposits on a submerged metal surface. Fouling also refers to the accumulation of normally inorganic deposits on heat exchanger tubing.
Deterioration at the interface of two contacting surfaces under load which is accelerated by their relative motion.
Term referring to a batch of reﬁned steel; a charged oxygen or electric furnace full of steel. A heat of steel can be used to cast several slabs, billets, or blooms.
Heat-Affected Zone [HAZ]
The part of a metal that is not melted during cutting, brazing, or welding, but whose microstructure and physical properties are altered by these processes.
Altering the properties of steel by subjecting it to a series of temperature changes. To increase the hardness, strength, or ductility of steel so that it is suitable for additional applications.
Steels that contain at least 0.3% carbon. If more carbon is added, the steel becomes less malleable and tougher to utilise. These steels are suitable for plow blades, bed
springs, shovels, and other high wear applications.
Steel that contains less than 5% hardening or strengthening alloys such as nickel, chromium, silicon, manganese, tungsten, molybdenum, and vanadium.
High Temperature Hydrogen Attack
A loss of strength and malleability of steel due to high temperature reactions of absorbed hydrogen with carbides in the steel, resulting in decarburisation and internal ﬁssuring.
Hollow Structural Sections
A high-strength, cold-formed steel tubing used in used for structural purposes in a broad range of applications. lts biggest advantage is the high strength-to-weight ratio it possesses.
Hot Band [Hot-Rolled Steel)
Steel that has been rolled on a hot-strip mill. It can be sold directly to customers or further processed into other ﬁnished products.
A process in which a tube is placed in a forming die and is formed to the shape of the mold by internal water pressure. This process is ideal for automotive parts because it allows for major shape deformation and holes can be made in the tube almost anywhere.
The absorption of hydrogen by a metal resulting in a loss of ductility.
Stepwise internal cracks that connect adjacent hydrogen blisters on different planes in the metal, or to the metal surface.
Hydrogen Stress Cracking
Cracking of a metal resulting from the combination of hydrogen and tensile stress.
Performing multiple processes to a piece of metal to produce a customer speciﬁed component part.
A hard supersaturated solid solution of iron characterised by an acicular (needle- like) microstructure.
A small category of magnetic steels typically containing 12% chromium, a moderate level of carbon, and a very low level of nickel.
Physical properties of a material concerning its elasticity when force is applied, particularly stress and strain.
Semi-permeable barrier made of connected strands of steel.
An extreme breakdown of a metal due to exposure to a carbonaceous gas at an elevated temperature.
Steel mills that melt scrap metal to produce commodity products. They have the same production requirements as integrated mills, but they utilise different labour relations, minimum size, product
An alloying element that enhances corrosion resistance along with chromium in stainless steels.
A reduction of the anodic reaction rate of an electrode involved in corrosion.
A state of a metal in which a surface reaction product causes a marked corrosion rate to that in the absence of the product.
Process where steel coils are cleaned using hydrochloric baths to remove impurities such as rust, dirt, and oil.
Melted iron produced in a blast furnace that contains at least 1.5% carbon. Named long ago when molten iron was poured through a trench in the ground to ﬂow into shallow earthen holes, the arrangement looked like newborn pigs suckling. The central channel became known as the "sow," and the moulds were “pigs”.
Piling [Sheet Piling]
A structural steel product with interlocking edges generally used in cofferdams and riverbank reinforcement.
Term that originally deﬁned a tube used to transport ﬂuids or gases. Now, pipe and tube are used interchangeably.
Localized corrosion (in the form of pits) of a metal surface that is confined to a small area.
The ratio of the depth of the deepest pit resulting from corrosion divided by the average penetration as calculated from mass loss.
Sheet steel measuring more than eight inches wide with a thickness ranging from one quarter of an inch to more than one foot.
Postweld heat treatment
Heating and cooling a weldment in such a way as to obtain desired properties.
Fabricating technique where fine metallic powder is compacted and heated under high pressure to solidify the material.
Precipitation Hardening [PH]
A small category of steels resembling martenistic steels that have great strength and hardness due to heat treatment.
Steel that is chemically treated to prepareit for future surface treatments and to prevent corrosion prior to future alterations.
Rust from iron that forms on the surface of steel after it is heated.
lron-containing material that is normally remelted and recasted into new steel. Home scrap is left over steel generated from edge trimming and rejects within the mill. It is usually sent straight back to the furnace. Prompt or industrial scrap that is trimmed by stampers and auctioned to buyers. Obsolete scrap is iron bearing waste such as old storage bins and junk cars that can be remelted in mini-mills.
Pipe produced from a solid billet that is heated and rotated under pressure. This rotating pressure creates a hole in the middle of the billet, which is then formed into a pipe by a mandrel.
Steel that has been rejected by an original customer because of a defect in the chemistry, gauge, or surface quality. Mills then search for another customer that will accept the steel at a discount.
Semi-processed forms of metal such as bars, sheets, rods, etc.
Steel products such as blooms, billets, or slabs that are then rolled and processed into beams, bars, sheets, etc.
An operation that buys metal, stores it, (often processing it in some way) and then sells it in a slightly different form than it was purchased from the producing mills.
Levelers, edge trimmers, and temper mills reshape processed steel to meet customers’ speciﬁcations. Reshaping is needed from processes that cause deformities in the steel.
Trimming of the edges of sheet and strip to make them parallel. This is done at either the steel mill or at the steel processor.
Steel that is thin, ﬂat and rolled in a coil. It is created in a hot strip mill by ﬂattening a slab, but keeping the side dimensions the same. The steel will lengthen as it is rolled. The most common differences among steel bars, strip, plate, and sheet are merely their physical dimensions of width and thickness.
Small steel scrap that is produced from shredded automobiles. The steel is separated by magnets and consumed by mini-mills for use in electric arc furnace operations.
Blast cleaning using steel shot as the abrasive.
Stressing the surface layer of a material by bombarding it with a selected medium (usually round steel shot) under controlled conditions.
An extremely brittle Fe-Cr phase that can form at elevated temperatures in Fe-Cr-Ni and Ni-Cr-Fe alloys.
A process that combines iron-bearing particles into small pellets that were recovered from environmental control ﬁlters. The pellets can be used as charge in a blast furnace.
A very common type of semi-finished steel usually measuring 10 inches thick by 30 - 85 inches wide and average 20 feet long. After casting, slabs are sent to a strip mill where it is rolled and coiled into sheet and plate products.
The impurities in a molten pool of iron. Flux may be added to congregate the impurities into a slag. Slag is lighter than iron and will ﬂoat allowing it to be skimmed.
Cutting a sheet of steel into a smaller strip to meet customers demands.
Solution heat treatment
Heating a metal to a higher temperature and maintaining it long enough for one or more constituents to enter the solid solution. The solution is then cooled rapidly to retain the constituents within.
The removal of contaminants such as oil, grease, dirt, salts, etc. by cleaning with a solvent, steam, vapor, alkali, or emulsion.
Metals with distinct chemical and physical properties. These alloys are produced for very specific applications; considered to be on the low end of superalloys.
Category of steel (normally high in carbon or other alloy) that includes electric, alloy, stainless, and tool steels.
A wide variety of high quality, specialised tubular products. It is usually found in the automotive and agricultural industries, construction equipment, hydraulic cylinders, etc.
Group of corrosion resistant steels containing at least 10% chromium and may contain other alloying elements. These steels resist corrosion and maintain its strength at high temperatures.
A reversing steel sheet reduction mill with heated coil boxes at each end. Steel sheet or plate is sent through the rolls of the reversing mill and coiled at the end of the mill, reheated in the coil box, and sent back through the Steckel stands and recoiled. By reheating the steel prior to each pass, the rolls can squeeze the steel thinner per pass and impart a better surface ﬁnish.
The amount of elongation, force, or compression that occurs in a metal at a given level of stress. Generally in terms of inches elongation per inch of material.
The ability of steel to oppose applied forces when considering resistance to stretching, forming, compressing, etc.
Stress Corrosion Cracking [SCC]
Slowly developing cracks that form in stainless steel due to mechanical stress and exposure to a corrosive environment.
Heating a metal to the appropriate temperature, maintaining it long enough to reduce residual stresses, and then cooling it slowly in order to minimise the development of residual stresses.
A thin, ﬂat piece of steel that is generally narrower than sheet steel and the gauge is monitored more carefully. lt may be cut from a steel sheet with a slitting machine.
An architectural steel product group that includes I-beams, H-beams, wide-ﬂange beams and sheet piling. These products are used in multi-story buildings, bridges, vertical highway supports, etc.
Lightweight metal alloys designed speciﬁcally to withstand extreme conditions. Conventional alloys are iron- based, cobalt-based, nickel-based, and titanium-based.
The reaction of a metal or alloy with a sulphur-containing species to produce a sulphur compound that forms on or beneath the surface of the metal or alloy.
Sulfide Stress Cracking
Cracking of a metal under the combined action of tensile stress and corrosion in the presence of water and hydrogen sulphide (a form of hydrogen stress cracking.)
A natural mineral containing less than 30% iron and is the primary ore used in blast furnaces today. It is used because domestic supplies of iron-rich ores were largely depleted in the 1940's and steel companies can process this lower grade mineral to make it useful.
A section of sheet steel that is cut to the manufacturer's desire. Excess steel is trimmed away to save transportation costs and is ready for the stamper to shape with a die press.
A cold-rolling mill that gives greater strength, a more uniform and smoother surface, and a reduced thickness to the steel sheet. This mill rolls steel through a series of rolls, to achieve a desired thickness and surface quality.
A by-product of tin processing, this refractory metal is used as a barrier tom corrosion of chemical processing and carbide cutting tools, and still-growing use as electronic capacitors and ﬁlaments. Melts at 2415 degrees Fahrenheit.
A very ductile and malleable white metal that is used in aviation, aerospace, etc. because of its high strength and light weight.
Lightweight, corrosive-resistant alloys suitable for high temperatures. These alloys are very practical for airplane parts. Titanium alloys can be blended with aluminium, iron, vanadium, silicon, cobalt, tantalum, zirconium, and manganese.
Hardened steels that are used in the manufacturing of tools and dies.
Unit of measure for steel scrap and iron ore.
When referring to OCTG, tubing is a separate pipe used within the casing to conduct the oil or gas to the surface. Depending on conditions and well life, tubing may have to be replaced during the operational life of a well.
Gray metal with high tensile strength. It is ductile, malleable, and resistant to atmospheric elements and all acids except strong alkalies.