(AKCELIK; has its main principles of meeting the demands of its customer with competitive prices and highest quality production and sevices just in time ( In 1978, Was established in izmir ) ( In 1990, Started his bright steel production line in Izmir Atatürk Organized Industrial Zone with a service area of 15.000 m² ) (In 2002, Started-up its new 12.800 m² high technology Cold-drawing and Peeling facility in Taysad/Tosb Organized Industrial Zone, Genze / Kocaeli ) More
STEEL is an Iron (Fe) Carbon (C) alloy. Alloy elements and impurities are present at different rates other than Karbom (C) .The chemical composition of the elements it contains and internal structure of steel that gives different features to steel. Alloy elements can be added to the steel at various ratios, the various processes and microstructure are controlled by heat treatment (tempering, normalization etc.) to have steel in different specifications according to purpose of use. Manganese (Mn), phosphorus (P), sulfur (S) and silicon (Si) are elements that originate from raw materials during production and are found in certain proportions in the steel. The other elements (Cr, Ni, etc.) are added to the steel in desired amounts in ferro-alloys
Steel is produced in two ways from the recycling of scrap or iron ore.
The structural steels of DIN norm were assembled under the DIN 17100 standard, and all materials with “St” in front of the DIN standard short designation were called structural steel.
Today, the DIN 17100 standard has been replaced by the EN 10025 standard.
In the case of the EN standard short designation, materials with “S” or “E” in front are called construction steel.
For a form in which the strength values of a building steel are taken from hot or cold rolled steel. If the structural steel is to be thinned by lifting the bolt or milling chip, the strength values to be generated will be much lower than the values stated in the catalog because the strength values in the inner parts of the structural steels are much lower than the strength values in the shell. For this reason, it is not possible to apply sawdust and heat treatments to the structural steels except cutting and drilling. The structural steels can be cut, bent, drilled and welded in the form provided.
In structural steels, the number given in the short notation in the DIN standard specifies the minimum breaking strength that should normally be provided in steel “Kgf / mm2” and the minimum yield strength in N / mm2 or MPa in EN.
S235JR – St 37-2 (1.0037) Construction is widely used in the construction industry, box profile, rod making and hot rolled industrial profiles.
S275JR – St 44-2 (1.0044) ASTM A570 Gr.40 It is used in the construction and industrial sector in the construction of high strength hot drawn industrial profiles.
S355J0 – St 52-3 (1.0570) It is used in applications requiring high strength in industry and construction sector.
E295 – St 50-2 (1.0050) ASTM A570 Gr.50 Used in the manufacture of loads, levers, molds and press pads which are subjected to more pressing stress.
E335 – St 60-2 (1.0060) Machine elements requiring high strength are used in manufacturing such as gear wheels.
E360 – St 70-2 (1.0070) Rivet is used for the production of machine elements requiring special bolt wedge and strength.
Steels that can be deepened in hardness by watering are called steep steels. Refinement steels are machine-made steels which are particularly suitable for hardening the compositions in terms of carbon content and exhibiting high toughness at a certain tensile strength at the end of the treatment process.
These steels can be plain carbon steel (C30, C45, etc.) or alloy steel (42CrMo4, 30CrNiMo8, 51CrV4 etc.).
Alloy steels have the ability to harden (in the inner regions) more than lean carbon steels because the elements such as Cr, Ni, Mo present in their contents provide less risk of cracking and collision of the steels during quenching than those of plain carbon steels.
In case of lean carbon steels, low-alloy steels can be supplied with water so that the crust hardness can only be reached to a certain depth. For fully hardenable alloy steels, this depth is more. The availability of this depth is determined by the applied hardenability test (Jominy test). The qualities for which the hardenability band is warranted will receive the letter “H” at the end of the quality name in the SAE standard display. (SAE 4140H, SAE 5140H) The same situation is expressed by the letters “+ H, + HL, and + HH” in EN standards.
C22E (1.1151) – SAE 1020 It is used in the production of parts made from high purity steel which is difficult to make in the construction of vehicles, machines, motors and apparatus.
C35E (1.1181) SAE 1035 The machine is used in the manufacture of parts which are difficult to manufacture in motor vehicles and engines and which require high purity.
C40E (1.1186) SAE 1040 It is used in the production of vehicles, machines, motors and apparatus, parts made of medium hard and high purity steel.
C45E (1.1191) SAE 1045 It is used in the production of vehicles, machines, motors and apparatus, parts made of medium hard and high purity steel.
C50E (1.1206) SAE 1050 Used in the production of parts to be machined with excessive force in the construction of machinery, vehicles, engines and apparatus.
C55E (1.1203) SAE 1055 Used in the production of machines, vehicles, motors and apparatus, parts which are subjected to too hard machining.
C60E (1.1221) SAE 1060 The machine is used in the manufacture of parts which are difficult to manufacture in motor vehicles and engines and which require high purity.
28Mn6 (1.1170) SAE 1330 / SAE 1527 It is used in the production of parts made of recycled manganese alloy for general machine and vehicle construction.
30CrNiMo8 (1.6580) It is used in the production of automobiles and engines, in the production of hard-to-reach parts with strength, ductility and elasticity.
34CrNiMo6 (1.6582) SAE 4340 Used in the production of automobiles and engines, crankshafts and other drive parts, such as front axles, axle housings.
34Cr4 (1.7033) SAE 5132 Used in the production of vehicles and machinery, crankshaft and other drive parts, front axle, axle housing.
37Cr4 (1.7034) SAE 5135 Cyanide ba
Iron carbon alloys containing a maximum of 2% carbon are called steel. Steels are still the most common today
Forming the used material group. The steels may be simple carbon,
They may contain some alloying elements to be developed. Elements found in steel; Voluntary
Alloying elements and the elements which, in addition to these, are desired to be removed and which affect the properties of the steel in a bad way.
Alloying elements and their effects used in steels are;
Carbon, the basic alloy element of steels, takes its place in the structure during the production process of the steels.
The amount of carbon is the most influential factor in the mechanical properties of the steel. Carbon, steel run and pull
Increase strength, decrease percentage (%) of elongation, shape and weldability. Pre-processing capability
The amount of carbon must be kept low in steels with plandard, where the strength values should be high
The carbon content of the steel should be high.
The most important problem that can arise during the formation of low carbon mild steel is blue brittle *.
This is due to the fact that the carbon (and / or nitrogen) atoms are small in diameter,
It creates fragility.
* Blue Bleach; If the mild steels are formed at 270-350 ° C, small-diameter atoms are released rapidly.
The released atoms lock the dislocations and increase the flow limit of the material. So the material
crispy treats. This is called blue embrittlement because the color that steel receives between the temperatures mentioned is blue.
Mangan is also an element in the steel structure in production processes such as carbon, and the effect that increases the strength of the steel
Shows. In addition, the austenite is a stabilizing element, which increases hardenability and weldability. Manga
The most important feature is to make sulfur MnS compound and prevent formation of iron sulfur FeS compound. FeS hot
It causes fragility.
Silicon is used in steel as it is used as oxygen deactivator. Steel flow, tensile strength and elasticity
It increases. As the amount of silicon in the steel structure decreases, the rate of descaling increases.
Silicon is a cheap alloy element, commonly used in spring steels that require high elasticity. also
Is an element that prevents electrical current loss.
Wire rods with a high amount of silicon are difficult to get down to very small diameters. Because silicon becomes the material wire
When it is brought, it hardens and hardens the texture. This is why low silicon is preferred in wire rods.
Phosphorus steel increases flow and tensile strength, worsens percent stretch and bending properties too much, cold
Creates brittleness, increases the ability of shaping. One of the remaining processes in the production of phosphorus steel
Element and because of its undesirable properties, it is removed from possible structure.
The maximum amount of phosphorus is 0.045% for quality improvement steels and 0.035% for prime improvement steels.
The effect on yield and tensile strength is negligible. But the percentage of the material and
The effect is too much. Sulfur significantly reduces the ductility and ductility of the material. Also the weldability is bad
Effect in the direction. Sulfur combines with iron to form the FeS phase. Because this phase has a low melting temperature
Melting at the rolling temperature causes hot fracture. This negative effect is the combination of sulfur and manganese
Sulfur is an element remaining in steel manufacture in steel and due to the abovementioned undesirable properties
It is removed from the structure as far as possible. Sulfur content in autoclaved steels only for machining
Are kept high.
The maximum amount of sulfur is 0.045% for quality improvement steels and 0.035% for prime improvement steels.
Chrome is the basic alloy element of stainless steels. It provides chromium, corrosion and oxidation resistance. curability
It increases your ability. In high carbon steels, it increases wear resistance. Chromium deposited on carbon boundaries with grain
Cr23C6 compound. In the case of stainless steels,
Pulls below the limit of 12%. This compound can be easily obtained by accelerating carbon emission at high temperatures
In welded and welded stainless steels, cause weld deformation near the weld seam.
Nickeline increases the strength in impact and annealed steels. Nickel austenitic stainless steel after chrome second
The most important alloy element. The amount of nickel in austenitic stainless steels is between 7-20%. Nickel austenite
Austenitic stainless steels, which, as the name implies, are at room temperature
The lattice structure is KYM dir. KYM lattice structure high austenitic stainless steel