Stainless steel is a special steel featuring a splendid surface and good resistance to rust. As a high value-added product, stainless steel can be used for diverse areas without requiring any additional treatment.
POSCO operates an integrated production system that ranges from steel making to hot rolling and cold rolling, producing two million tons of stainless steel products every year. Stainless steel products can be classified into austenitic stainless steel, ferritic stainless steel and martensitic stainless steel according to their alloy components and tissue structure. Their typical applications include car exhaust pipes, kitchen appliances, electronics and construction materials. Emerging applications include eco-friendly sectors, such as EV battery cases and LNG.
Austenitic Series(300 Series)
This stainless steel is the most widely used of all its kinds. It contains chrome and nickel and features good formability, weldability and anti-corrosion. The most common austenitic stainless steel is Type 304. There are also other notable austenitic stainless steels-Types 316L, 321 and 304J1 to name a few-produced by adding different alloy elements such as Mo, Ti and Cu. Main applications of austenitic stainless steel include kitchen utensils, construction and chemical instruments.
The main chemical composition of Type 301 is 17Cr - 7Ni and Type 301L is 17Cr - 7Ni - LC. This stainless steel contains less Cr and Ni than Type 304 and can have higher strength through hot rolling.
ApplicationsIts common applications include springs and rolling stock.
The main chemical composition of Type 304 is 18Cr - 8Ni. The most extensively used stainless steel featuring good resistance to corrosion and heat among other mechanical properties.
ApplicationsMajor applications include home appliances, construction and kitchen appliances.
The main chemical composition is 18Cr - 9Ni - LC. This stainless steel contains less carbon than 304 and has good resistance to intergranular corrosion.
ApplicationsIts common applications include industrial machines, chemical facilities and LNG tanks.
The main chemical composition is 17Cr - 8Ni - 2Cu. This stainless steel has good formability as it contains Cu.
ApplicationsIts common applications include kitchen sinks, vacuum flasks and deep drawing.
The main chemical composition is 18Cr - 12Ni - 2Mo.This stainless steel contains Mo and increased Ni to have good resistance to corrosion. It can also withstand high temperatures
ApplicationsIts common applications include water pipes, chemical plants and coastal facilities.
The main chemical composition is 18Cr - 12Ni - 2Mo - LC. This stainless steel contains less carbon than 316 and, therefore, has good resistance to intergranular corrosion.
ApplicationsIt is extensively used for applications exposed to sources of corrosion, such as salt and toxic gas.
The main chemical composition is 18Cr - 11Ni - 2Mo - 0.13N (thick plates). This stainless steel is made by adding nitrogen to 316L steel.
ApplicationsIts common applications include chemical plants and storage tanks.
The main chemical composition is 18Cr - 9Ni - 0.3Ti. This stainless steel is made by adding Ti to 304 steel for better resistance to intergranular corrosion.
ApplicationsIts common applications include heat exchangers and boiler covers.
The main chemical composition is 19Cr - 13Ni - 3.5Si (cold rolled). This stainless steel contains Si for better resistance to high-temperature salt corrosion and oxidation.
ApplicationsIts common applications include car exhaust systems, heaters and incinerator components.
The main chemical composition is 22Cr - 20Ni.This stainless steel contains increased Cr and Ni for good resistance to high-temperature oxidation and higher strength at high temperatures.
ApplicationsIt is extensively used in applications requiring good resistance to heat including exhaust systems and heat exchangers.
For ferritic steel, chrome is one of its alloy components. This gives the steel low thermal expansion and a good resistance to corrosion. The most common austenitic stainless steel is Type 430. There are also other notable austenitic stainless steels-Types 409L, 430J1L and 444 to name a few-produced by adding different alloy elements such as Ti, Nb and Mo. Its main applications include exhaust systems and home appliances.
The main chemical composition is 16Cr - 0.05C. The most commonly used ferritic stainless steel featuring good formability and resistance to oxidation
ApplicationsIts typical applications include kitchen appliances, utensils and architectural materials.
The main chemical composition is 11Cr - 02Ti - LCN. This stainless steel contains Ti for better weldability and machinability.
ApplicationsIts common applications include car exhaust systems, heat exchangers and heat resisting wares.
The main chemical composition is 12Cr - LCN.This stainless steel is basically 410 steel, but with a reduced carbon content for better weldability, toughness and machinability.
ApplicationsIts typical uses include containers and architectural materials.
The main chemical composition is 14Cr - 1Si - 0.2Ti - LC. This product contains newly added Si, Ti, Mn, Cu and others and reduced C and N for better strength at high temperatures, better resistance to oxidation and improved formability.
ApplicationsIts typical applications include car exhaust systems and heat resisting wares.
The main chemical composition is 19Cr - 0.5Cu - 0.4Nb - LCN. This product is made by adding Cu and Nb to 430 steel for better resistance to corrosion, better formability and weldability as well as improved properties at high temperatures.
ApplicationsIts common uses include washing tubs, kitchen appliances, home appliances and heat resisting wares.
The main chemical composition is 18Cr - 1Mo - 0.3Ti - LCN. Addition of Mo, Ti and Nb assures good resistance to corrosion, machinability and weldability.
ApplicationsIts typical uses include car exhaust systems, heat resisting ware and hot water wares.
The main chemical composition is 18Cr - 0.4Ti - LCN. This stainless steel contains Ti that can improve resistance to corrosion, machinability and weldability.
ApplicationsIts typical applications include car exhaust systems and architectural materials.
The main chemical composition is 19Cr - 2Mo - 0.3Nb - LCN. This product contains high Cr and Mo that can improve resistance to intergranular corrosion and stress corrosion cracking.
ApplicationsIts common uses include water tanks and water heating systems.
The main chemical composition is 21Cr - 0.3Ti - 0.4Cu - Si,Nb. This high Cr content stainless steel has good resistance to corrosion and good formability.
ApplicationsIt is used for wide applications including elevators, utensils and architectural materials.
The main chemical composition is 26Cr - 2Mo - 0.3 (Ti, Nb) - LCN (cold rolling). This product contains high Cr and Mo that can improve resistance to corrosion.
ApplicationsIts common uses include exterior walls and roofs on coastal areas.
Martensitic steel contains 12 percent of chrome. Its higher content of carbon compared to other types of steel can give it greater hardness through quenched heat treatment. Its main applications include cutlery and disc brakes.
The main chemical composition is 13Cr - 0.04C. This steel gets hardened when heat-treated. With good machinability and high strength
ApplicationsIt is widely used for mechanical components, blades and many other applications.
The main chemical composition is 12Cr - 0.4Ni. This product can have varied quenched hardness by changing Mn or Ni content from 410.
ApplicationsIts typical use is motorcycle disc brakes.
The main chemical composition is 13Cr - 0.1C - 0.1N. This product has higher machinability, higher resistance to corrosion and higher strength than 420J1.
ApplicationsIts typical use is first class utensil knives.
The main chemical composition is 13Cr - 0.3C. This stainless steel has a higher quenched hardness than 420J1.
ApplicationsIt is widely used for mechanical parts that require good resistance to abrasion.
Duplex steel combines austenitic and ferritic steels to provide higher strength and better resistance to corrosion. It is extensively used for industrial purposes including water tanks and desalination installations.
The main chemical composition is 20Cr - 2.5Ni - 1.4Mo - N. This is Ni and Mo saving lean duplex steel, featuring good resistance to corrosion and intergranular corrosion.
ApplicationsIts common applications include mechanical components, knives, etc.
The main chemical composition is 22Cr - 5Ni - 3Mo - 0.15N. This product contains many elements that can improve resistance to corrosion, including Cr, Mo and N. Ideal for applications requiring resistance to chloride, SCC, pitting, crevice, abrasion or erosion.
ApplicationsIts typical uses include desalination facilities, chemical plants and food processing.
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