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The POSCO Quality

Wire Rod

Wire rods are available in the form of coils. The cross-section of the rod ranges from 5.5 to 42 mm.
Billets produced from a continuous casting system are rolled, cooled and coiled into the sizes required by the customers.

POSCO uses a state-of-the-art facility and technology to produce wire rods. We use a fully computerized automatic system to deliver products of various dimensions. Wire rods are used for wide applications ranging from motor vehicles to construction, bridges and even basic research efforts.

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Spring Steel

There are two types of wire rods intended for springs: one for vehicle suspensions and the other for engine valves and clutches. Suspension springs provide an improved ride by absorbing and/or mitigating shocks and/or vibrations that the motor vehicle experiences from the surface during a drive and enhance safety by ensuring balance throughout a turn. The recent demand for high strength suspension springs is increasing as the industry seeks reduced weight and higher fuel efficiency in motor vehicles. For this application, anti-decarburization (reduction of carbon content in steel due to oxidation) and anti-corrosion capabilities are required.

Key Specifications

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  • POSCOPOSCO Standards
  • KSKorean Industrial Standards
  • JISJapanese Industrial Standards
  • ENEuropean Standards
  • DINDentsches Institut fur Normung
  • BSBritish Standards
  • ASTMAmerican Society for Testing and Materials
  • SAESociety of Automotive Engineers
  • APIAmerican Petroleum Institute
닫기
  • - POSCO : PosHIS1250S/125/125RC
  • - JIS : SUP9/9A/12
  • - DIN : 54SICR6
  • - SAE : SAE9254S

Engine valve springs are used to control fuel and exhaust gas before and after combustion within the engine cylinders. In addition, the clutch spring helps the clutch connect the rotating shaft from the engine to the transmission and disconnect the shaft. Wire rods for engine valve springs require robust quality inside and out as they are subject to loads repeatedly in a high-temperature and high-speed environment. It is particularly imperative to identify any non-metal inclusion that can damage the spring and thus ensure its surface quality.

Key Specifications

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  • POSCOPOSCO Standards
  • KSKorean Industrial Standards
  • JISJapanese Industrial Standards
  • ENEuropean Standards
  • DINDentsches Institut fur Normung
  • BSBritish Standards
  • ASTMAmerican Society for Testing and Materials
  • SAESociety of Automotive Engineers
  • APIAmerican Petroleum Institute
닫기
  • - SAE : SAE9254V, SAE9254HV etc.
Related Industries
Automotive Chassis

What is a Suspension Spring?

A suspension spring is used to support the body of a motor vehicle. Located between the frame and the axle, it improves the ride and ensures safety by absorbing and/or mitigating shocks and/or vibrations that the motor vehicle experiences from the surface during a drive.

SAE9254S

This steel contains Si and Cr and is intended for suspension springs. Quenched and tempered, it features good fatigue strength. The steel goes through hot forming and cold forming before being finally made into the shape of a spring.

Applications

Coil springs intended for vehicle suspension

Mechanical Properties
기계적성질의 세부 스펙
Quenching
Temp. (℃)
Tempering
temp. (℃)
TS (kgf/mm2) RA (%) El. (%)
980 300 219 34 6.5
330 223 33 7.2
360 215 38 8.1
390 199 44 9.0
420 185 48 9.5
450 167 53 8.5
PosHIS120S

This steel contains Si and Cr and is intended for suspension springs. Quenched and tempered, it features good fatigue strength as well as high design stress of 1200 MPa. The steel goes through cold forming before being finally made into the shape of a spring.

Applications

Coil springs intended for vehicle suspension

Mechanical Properties
기계적성질의 세부 스펙
Quenching
Temp. (℃)
Tempering
temp. (℃)
TS (kgf/mm2) RA (%) El. (%) Impact Toughness
(kgf-m/cm2)
980 360 217 26 6.5 2.2
380 213 30 7 2.3
400 200 33 8 2.8
420 183 37 9 4.2
450 175 37.1 9.5 4.2
480 160 34 8.5 4.3
PosHIS125

This steel is intended for suspension springs based on higher corrosion resistance. Quenched and tempered, it features good fatigue strength as well as high design stress of 1250 MPa. The steel goes through hot forming and cold forming before being finally made into the shape of a spring.

Applications

Coil springs intended for vehicle suspension

Hardness with Tempering Temp. (Comparison) PosHIS125 기계적 성질을 나타낸 그래프입니다.

What Is an Engine Valve Spring?

Engine valve springs are one of the most critical springs in a motor vehicle engine. They not only support intake and discharge valves during opening and closing but also seal the ignition chamber when it is closed. The most commonly used form is a coil spring.

SAE9254V

This steel contains Si and Cr and is intended for engine valve springs. Quenched and tempered, it features good fatigue strength. The steel goes through cold forming before being finally made into the shape of a spring.

Applications

Coil springs intended for vehicle engine valves

Hardness with Tempering Temp SAE9254V 기계적 성질을 나타낸 그래프입니다.
SAE9254HV

This high strength steel contains a small amount of V, an alloy element, and is intended for engine valve springs. Quenched and tempered, it features good fatigue strength. The steel goes through cold forming before being finally made into the shape of a spring.

Applications

Coil springs intended for vehicle engine valves

Hardness with Tempering Temp SAE9254HV 기계적 성질을 나타낸 그래프입니다.

Tire Cord Steel

Made by adding elements (Cr, Si, Mn, etc.) to 0.70-0.92 percent high carbon steel for higher strength. This material is drawn into fine wires (0.15-0.38mm) that are subsequently twisted into tire cord (for use as reinforcement to protect tires from external pressure and shock for extended life). Wire rods for tire cord require sufficient cleanness for drawing and lightness, and high strength for high fuel efficiency. More and more customers require mechanical descaling, instead of pickling, that can eliminate a heat treatment process out of environmental concerns.

Key Specifications

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  • POSCOPOSCO Standards
  • KSKorean Industrial Standards
  • JISJapanese Industrial Standards
  • ENEuropean Standards
  • DINDentsches Institut fur Normung
  • BSBritish Standards
  • ASTMAmerican Society for Testing and Materials
  • SAESociety of Automotive Engineers
  • APIAmerican Petroleum Institute
닫기
  • - POSCO : PosCord70S/80S/92Cr/92Si/102Cr
타이어코드용강의 주요 규격
Category Normal Tensile
(2.8GPa)
High Tensile
(3.2GPa)
Super High Tensile
(3.6GPa)
Ultra High Tensile
(4.0GPa)
Mega Tensile
(4.4GPa)
Specifications PosCord70S PosCord80S PosCord92Cr PosCord92Si PosCord102Cr
Related Industries
Automotive Chassis

Bearing Steel

Bearing steel is used to make a variety of mechanical parts including bolts, nuts and screws by means of hot/cold forging or heading. Major applications include couplings for motor vehicles, bolts used in construction and forged parts for mechanical equipment that require uniform chemical elements and good internal quality.

Key Specifications

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  • POSCOPOSCO Standards
  • KSKorean Industrial Standards
  • JISJapanese Industrial Standards
  • ENEuropean Standards
  • DINDentsches Institut fur Normung
  • BSBritish Standards
  • ASTMAmerican Society for Testing and Materials
  • SAESociety of Automotive Engineers
  • APIAmerican Petroleum Institute
닫기
  • - JIS : SUJ2/SUJ2K/SUJ2Z
  • - SAE : SAE52100
Related Industries
Automotive Chassis

Steel for CHQ

CHQ (cold heading quality) wire rods are used to make various mechanical parts including bolts, nuts and screws by means of hot/cold forging or heading. Major applications include couplings for motor vehicles, bolts used in construction and forged parts for mechanical equipment that require uniform chemical elements and good internal quality.

Key Specifications

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  • POSCOPOSCO Standards
  • KSKorean Industrial Standards
  • JISJapanese Industrial Standards
  • ENEuropean Standards
  • DINDentsches Institut fur Normung
  • BSBritish Standards
  • ASTMAmerican Society for Testing and Materials
  • SAESociety of Automotive Engineers
  • APIAmerican Petroleum Institute
닫기
  • - POSCO : POSA1021B, POSA5120BH, POSMA45RM
  • - JIS : JIS-SWRCH10A/15A/18A/25F/35F/45F
  • - SAE : SAE10B21/10B22/10B30/10B30/10B35/10B38/1541/15B24/15B25/15B41/8740/1050S/1060S
Related Industries
Machine Structure

High Carbon Steel

As high carbon steel, it requires control of its fine pearlite structure to maintain high strength and achieve good drawability. Its typical applications include wire ropes, precision springs, bead wires and regular PC steel wires.

Key Specifications

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  • POSCOPOSCO Standards
  • KSKorean Industrial Standards
  • JISJapanese Industrial Standards
  • ENEuropean Standards
  • DINDentsches Institut fur Normung
  • BSBritish Standards
  • ASTMAmerican Society for Testing and Materials
  • SAESociety of Automotive Engineers
  • APIAmerican Petroleum Institute
닫기
  • - JIS : SWRH27~82A/B
  • - SAE : 1026~1095

Steel for Bridge Cable

Carbon steel for mechanical structure with a small amount of boron or a large amount of Si is manufactured by processing high-frequency heat in customers.

Key Specifications

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  • POSCOPOSCO Standards
  • KSKorean Industrial Standards
  • JISJapanese Industrial Standards
  • ENEuropean Standards
  • DINDentsches Institut fur Normung
  • BSBritish Standards
  • ASTMAmerican Society for Testing and Materials
  • SAESociety of Automotive Engineers
  • APIAmerican Petroleum Institute
닫기
  • - POSCO : POSCABLE82, 86, 90, 92 POSMICRO62
  • - JIS : SWRS62A/B~92A
Related Industries
Bridge

High Strength Steel

It is clean steel with a high carbon content featuring high drawability, high strength and good anti-fatigue. It is extensively used for high strength bead wires, PC steel wires and bridge cables.

Key Specifications

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  • POSCOPOSCO Standards
  • KSKorean Industrial Standards
  • JISJapanese Industrial Standards
  • ENEuropean Standards
  • DINDentsches Institut fur Normung
  • BSBritish Standards
  • ASTMAmerican Society for Testing and Materials
  • SAESociety of Automotive Engineers
  • APIAmerican Petroleum Institute
닫기
  • - POSCO : PSPC22, 30B~35B, 30SI~35SI, 32SIB/32SIBM
  • - SAE : 10B30~35

Steel for Machine Structure

This is carbon steel largely used for bolts, nuts and other fasteners in mechanical devices or applications for transfer of power, such as shafts.

Key Specifications

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  • POSCOPOSCO Standards
  • KSKorean Industrial Standards
  • JISJapanese Industrial Standards
  • ENEuropean Standards
  • DINDentsches Institut fur Normung
  • BSBritish Standards
  • ASTMAmerican Society for Testing and Materials
  • SAESociety of Automotive Engineers
  • APIAmerican Petroleum Institute
닫기
  • - JIS : S10~55C
  • - SAE : 1022~1060
Related Industries
Machine Structure

Free Cutting Steel

Made by adding phosphorus, sulfur or other free-cutting elements to regular steel for improved machinability. Major applications include precision parts for motor vehicles and electronics, such as printer shafts.

Key Specifications

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  • POSCOPOSCO Standards
  • KSKorean Industrial Standards
  • JISJapanese Industrial Standards
  • ENEuropean Standards
  • DINDentsches Institut fur Normung
  • BSBritish Standards
  • ASTMAmerican Society for Testing and Materials
  • SAESociety of Automotive Engineers
  • APIAmerican Petroleum Institute
닫기
  • - POSCO : POSCUT1S,2S
  • - JIS : SUM22,43
Related Industries
Machine Structure

Steel for Welding Rod

Gas welding wire rods are used for arc welding, which involves the blocking of the atmosphere using carbon dioxide, argon or similar. Major applications include automotive, shipbuilding and containers. Submerged welding rods are used for arc welding, which involves the spraying of a coating agent through which a wire is inserted. Major applications include automatic welding of heavy, thick plates in shipbuilding, off-/onshore structures and other sectors. Features required for this material include an ability to be drawn at high speed, good arc stability during automatic welding, optimal element combination for the minimal occurrence of spatter and minimal deviation in tensile strength for uniform feeding. Types of welding where this material is used include gas metal arc welding, submerged welding and shielded metal arc welding.

Key Specifications

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  • POSCOPOSCO Standards
  • KSKorean Industrial Standards
  • JISJapanese Industrial Standards
  • ENEuropean Standards
  • DINDentsches Institut fur Normung
  • BSBritish Standards
  • ASTMAmerican Society for Testing and Materials
  • SAESociety of Automotive Engineers
  • APIAmerican Petroleum Institute
닫기
  • - POSCO : PosWeld1A/1B/1C/1BS/1CM/2A/2J/2B/2BR/2MO/23/41/4B/4D/4DR/50/60
  • - JIS : SWRY11/11L
Related Industries
Machine Structure

Low Carbon Steel

Steel with a carbon content of no greater than 0.22 percent. Mild steel compliant with the POSFIS specifications, in particular, is used for high-quality fine steel wires. Features required for this material include an ability to manage inclusion for fine wire processing and make Si-killed steel as well as exfoliation for mechanical descaling. Major applications include galvanized steel wires, steel fibers, nails, black annealed wires and wire mesh.

Key Specifications

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  • POSCOPOSCO Standards
  • KSKorean Industrial Standards
  • JISJapanese Industrial Standards
  • ENEuropean Standards
  • DINDentsches Institut fur Normung
  • BSBritish Standards
  • ASTMAmerican Society for Testing and Materials
  • SAESociety of Automotive Engineers
  • APIAmerican Petroleum Institute
닫기
  • - POSCO : POSFIS5AS/5M1/6M1/6B/6K
  • - JIS : SWRM6B/6K/5M1/6M1/8K/10K/12K/15K/17/20/22
  • - SAE : 1005/1006/1008/1010/1012/1015/1016/1018/1020/1022
Related Industries
Machine Structure

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