Steel Parts

1. Hot Rolled SteelThe slab from the continuous casting mill or the bottom mill is heated in the reheating furnace at a temperature of 1,250ºC. After the slab is heated and before it can be rolled, the scale that has accumulated on the slab’s surface is removed by the scale breaker. At the roughing mill and finishing mill, the slab is rolled to its target specifications before being cooled at the cooling table where it is then made into hot rolled coils.     1) Hot-Rolled Steel for General Structures General structural steel and welding structural steel are used in the construction of steel structures, bridges, ships and automobiles. JIS : SS330, SS400, SS490, SS540, SM400A, B, C,SM490A, B, C, SM400YA,YB, SM520B, C, SM570 ASTM : A36, A283, A570 BS : BS1449 PART1 50/35HR, HS, BS4360 43A, B, C, 50B, C DIN : DIN17100 ST22, ST33, ST37-2, ST52-3, RST37-2    2) Atmospheric Corrosion Resistant Steel This type of steel enhances in both corrosion and atmospheric corrosion resistant properties, adding such special elements as P, Cu, and C, and is used in the manufacturing of containers, special automobiles and construction structures. POSCO : PAWS50 JIS : SPA-H    3) Hot-Rolled Steel for Automobile Structural Uses This high-strength steel has a good weldability and is used in automobile frames, members, and wheel disks. POSCO : ATOS55, 60, 80 AUTOBEAM, STAB JIS : SAPH310, 370, 400, 440, SPFH540, 590 ASTM : A715-40, 45, 50, 55, 60, 65, 70, 80    4) Hot-Rolled Carbon Steel for Pipes and Tubes This steel, excellent in weldability and formability, is widely used in structural pipes, general pipes, special pipes, and machine structural carbon steel pipe. JIS : SPHT1, 2, 3, 4, STB340, 410, STK290, 400, 490, 500, 540, STKM11A, 12B, 13A, 13B, 14B, 16A, 18A POSCO : PACOS1, 2, POSP290A~POSP540A    5) Hot-Rolled Steel for Gas Cylinders This steel, which have high strength and good formability, is used in high-pressure gas container with less than a 500l inner capacity containing LPG, acetylene and other high-pressure gases. JIS : SG255, 295, 325, 365 POSCO : A455    6) Steel for Casting and Tubing of Oilwell Pipes This type of steel is characterized by a strict quality of high strength, extremely low temperature toughness, excellent weldability and fracture resistance, and is used in drilling and producing in severely cold areas, or for deep sea oilwells. API : 5G-J55, K55, N80, P110    7) Steel for Line Pipes This steel excels in high strength, extremely low temperature toughness, hydrogen induced crack resistance and weldability, and is thus used in line pipes. API : 5L-A, B, X42, X46, X52, X60, X65, X70, X80    8) Steel for Special Uses This steel includes general machine structural steel, alloy steel and steel for tools and used for various machine parts. JIS : S10C-S55C, SK2, 3, 4, 5, 7, SUP9, SCM415, 430, 435, 440 SAE : SAE1010-1055 DIN : 50CRV4, 75CR1    9) Steel for cold-rolled steel This steel is used to manufacture cold rolled steel, galvanized steel and electro galvanized and color steel sheet. SAE : SAE1006-1055    10) Hot-Rolled Steel for Hull Structures This steel has received approval for its manufacturing process from overseas classification societies. A, B, and D grade products are used in shipbuilding and are excellent in weldability and shock resistance. Classification Society Standards : KR-RA, RB, AB-A, LR-A, B, NK-KA, NV-A    11) Hot-Rolled Steel for Machine Structures Carbon tool and spring steel are produced to be used in such special applications as saws, washers, tapelines and springs that require good hardenability and fatigue resistance. For springs  : JIS SUP9 For machine structures : JIS S10C-S55C For steel tools : JIS SK85, SK105     2. Steel Plate TMCP is the process of rolling and accelerated cooling (PILAC) to produce high tensile steel without heat treatment, which means by adding small amount of alloy, high strength and superior tenacity are obtained and reduction of carbon equivalents (CEQ) provides better performance in use of welding by the customers.    1) Steel for Ships  Classification general steel, high tension steel and TMCP-type high-tension steel, with which heat input high-efficiency welding is possible, have all obtained manufacturing approval from overseas classification societies. This steel is widely used in shipbuilding. Classification Societies: KR, NK, ABS, GL, LR, NV, RINA, CR, BV NK : KA, KB, KD, KE, KA32, KD32, KA36, KD36, KA40, KD40,KE40, KL24A, BKL33, 37 ABS : A, B, C, D, AH32, DH32, EH32, AH40, DH40, EH40, V-60 NV : A, B, C, D, A27, D27, E27, A32, D32, E32, A36, D36,E36, A40, D40, E40 CR : A, B, C, D, A32, D32, E32, A36, D36, E36, A40, D40, E40 BV : A, B, C, D, A32, D32, E32, A36, D36, E36, A40, D40, E40 RINA : A, B, C, D, A27, D27, E27, A32, D32, E32, A36, D36, E36,A40, D40, E40 LR : AH32, DH32, EH32, AHS34, DHS34, AH36, DH36, EH36,AH40, DH40, EH40, LT60-360, 410 GL : A32, D32, E32, A36, D36, E36, A40, D40, E40, 490T, 500T   2) Steel for Automobile Structural Uses Steel excellent in bending and deep drawing is used in automobile structures. JIS : SAPH400   3) Steel for General Structures The Steel for general welding structures, bridges, industrial structures has high weldability and is widely used in machines and construction materials. High tension steel the 60kg class is produced after heat treatment process of quenching & tempering. KS : SS330, 400, 490, 540, SM400, 490, 520, 570, SN400, 490, HSB500, 600 JIS : SS330, 400, 490, SM400A, B, C, SM490A, B, C, AM490YA, YB, SM520B, C, SM570 ASTM : A283 GrA, B, C, D, A36, A283 GrA, B, C, D, A572 Gr42, 50, 60, 65, A633 GrE, A514F, A573 Gr70 DIN : ST37-2, 3, ST52-3, RST37-2, ST44-2, 3 BS : 4360 Gr40B Gr43A, B, C, D, E, EEGr50A, B, C, D POSCO : POSTEN60, 80, POSTEN6ORE, POSTEN60FW, POSTEN55H, PILAC-BT33, PILAC-BT36, PILAC-BT45 EN10025 : S355J2, S355K2    4) Atmospheric Corrosion Resistant Steel Such atmospheric corrosion resistant elements as Cu, Cr, and Ni are added to structural steel to increase both weather and corrosion resistance. This type of steel is classified into coated and non-coated steels. JIS : SMA400, 490, 570 ASTM : A588 GrA, B, C    5) Steel for Machine Structural Uses Steel excellent in machinability and abrasion resistance is used in the production of mechanical parts.   JIS : S10C-S55C, SCM440, AISI1020-1055 ASTM : SAE1010-1049 POSCO  : POSMOLD1, 2   6) Medium-to-High & Intermediate Temperature Steel Steel excellent in workability and weldability, and both heat and corrosion resistant, is used for gas ball tanks, LPG tanks, petroleum and liquefied materials storage tanks, and fire power generation boilers. JIS : SB410, 450, 480, SGV410, SPV235, 315, 450, 490, SB450M, 480M ASTM : A285 GrA, B, C, A515 Gr55, 60, 65, 70, A537 CLASS1, 2, A387 Gr11, 12, 22, A302 GrC, A553-1   7) Steel for Transporting Petroleum This steel is used in line pipes that transport petroleum or natural gas in large quantities. Steel proven with extremely low-temperature toughness, hydrogen-induced crack(HIC) resistance and stress-corrosion crack(SSC) resistance is produced in order to cope with the worsening environmental situation stemming from exhaustion of our natural resources. API : API 5L- B, X42, X46, X52, X56, X60, X65, X70, X80, X90, X100, X120   8) Steel for Marine Structural Uses Steel with lamellar tear resistance is used in oil drilling ships and crude oil production platforms. This type of steel has improved ductility in thickness direction as well as lowtemperature toughness. API : API 2H Gr42, 50, API 2W Gr50T, API 2W Gr60 EN10225 : S355G9+M, S355G10+M    9) Steel for Low Temperature Pressure Vessels Ni is added to this type of steel, giving it excellent lowtemperature toughness and corrosion resistance. This type of steel is used in LNG tanks and liquefied gas storage tanks JIS : SLA325B, 360 ASTM  : A203 GrD, E   3. Wire Rod In order to improve the surface quality of wire rods, the surfaces of the materials, billets, are descaled by shot blasting. And after inspecting any surface flaw and imperfection by a magnetic particle tester, the flaws are removed from the surface by using a grinding machine. In addition, the continuous ultrasonic testing is conducted to guarantee the internal quality of the billets.    4. Cold Rolled Steel All POSCO mills have adopted PCM(Pickling & Tandem Cold Rolling Mill) type which make continuous processing from pickling and cold-rolling process possible. Steel sheet that has undergone this line are then forwarded as pickled coils or used as material for hot-dip galvanized steel sheet.    5. Galvanized Steel It is the equipment that applies zinc plating by dipping a sheet of hot-rolled steel into a molten zinc pot so as to be coated with zinc deposits.     6. Electrical Galvanized Steel There are plating facilities of Horizontal type and Casosel type. The horizontal type is moving horizontally in the plating bath and both faces are plating at the same time and produces double faced plating materials not generating band mark. And the carosel type can produces a product which is proper to the customer's requirements such like coating ability, corrosion resistance ability through free control of plating quantity - one side, deflection, double faced plating etc. - by one side by one side plating, steel plate rotating with adhesion to conductor roll. Producible plating kinds are Pure-Zn, Zn-Fe, Zn-Ni, heterogeneity plating And also recently, the production quantity of environment familiar steel plate is increasing with demand increasing, which is not coated with Cr.      7. Electrical Steel This mill provides the internal energy needed for efficient grain growth by rolling steel plates up to the target gauge. This minimizes eddy current loss while in use after the manufacturing of iron core.     8. Stainless Steel The main raw materials, Ferro-Alloys(Fe-Cr, Fe-Ni) and stainless steel Scrap are melted in the Electro Arc Furnace(EAF). The material steel is refined for the properties of steel for the application through the vacuum with gas or decarbonization, deoxidization and desulfurization.      9.Titanium Product Combining our world-best manufacturing technology in steel & stainless steel, POSCO is now producing titanium products of the highest quality. In addition, POSCO will complete the vertical integration to slab production by 2013, and this will provide our customers with more reliable supply of titanium product.