wirerod posco

Wire Rod

3WIRE ROD

Good qualities for various kinds of steel wire rods are maintained

in production by using the top of the line equipments and acquired

technologies. We will constantly make efforts to develop products

much superior in quality and new products meeting the needs for

clients in the future.

W i r e R o d

ContentsManufacturing Equipments 4Manufacturing Process 6Production Equipments 8Test Items 9Main Uses 10Quality Control Items 12Manufacturable Dimensions 14Manufacturable Sizes and Packaging 28

4WIRE ROD

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In order to improve the surface qualityof wire rods, the surfaces of the

materials, billets, are descaled byshot blasting.

And after inspecting any surface flawand imperfection by a magnetic

particle tester, the flaws are removedfrom the surface by using a grindingmachine. In addition, the continuous

ultrasonic testing is conducted toguarantee the internal quality of the

billets.

MANUFACTURINGEQUIPMENTS M A N U F A C T U R I N G E Q U I P M E N T S

1Billet

Conditioning

In order to secure the quality of materialsaccording to each kind of steel and

application, the heating temperature andresidence time of the reheating furnaceare adjusted accordingly. Especially,after preheating the wire rods at a low

temperature in order to preventdecarburization from deciding thesurface quality, they are reheated

quickly at a proper rolling temperaturerange. At this time, the rolling speed and

the fuel-to-air ratio in the reheatingfurnace are controlled properly.

2ReheatingFurnace

The material characteristics requiredby the clients are secured by

adjusting the rolling temperature,pressure and deformation rate of wire

rods. And then, the roll surfaceroughness, gap and the sizes areadjusted while conducting the flawinspection in hot-rolled wire rods.

3Rolling

The characteristics of each kind of steelfor each appropriate application issecured by adjusting the cooling

conditions, such as coiling temperature,air floor volume of the air cooling system,the progression velocity, and the opening

or closing of a slow-cooling section. In the case of high carbon steel wire rods,

the structure gets refined and the roddrawability is secured by using a uniform

fast-cooling method. In cases of alloysteel and low carbon steel, softened

structures are created by a slow-coolingprocedure in order to streamline the wirerod manufacturing process for the client’s

companies.

4Cooling

After collecting specimens from theleading and trailing edges of a wirerod cooled after being rolled, somesurface flaw detection and material

quality assurance tests areconducted with such specimens and

the products are packed afterattached with a tag while fulfilling

each client’s requirements.

5Inspection

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MANUFACTURINGPROCESS M A N U F A C T U R I N G P R O C E S S

Since the inspections during all the productionprocesses from steelmaking via billet rolling to wirerod rolling are accurately conducted by thecomputers, all the products appropriate for eachdimension are produced. In addition, in order toproduce much superior wire rods, it is thus managedin order for this company to deliver the perfect qualityof goods through various kinds of final product andwire rod inspections.

(○: Applied, △: Partially Applied)

PRODUCTIONEQUIPMENTS TEST ITEMS P R O D U C T I O N E Q U I P M E N T S T E S T I T E M S

Accurate Inspection Prior Delivering Good Quality Products

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Division Kind of SteelTest Item

1 Wire Rod 2 Wire Rod 3 Wire Rod

MaterialsUnit Weight (tons)

Size (mm)

Size Range (mm)

Cooling Equipments

Major Products

* Low Carbon Steel

* High Carbon Steel

* High Tensile Steel

* Free-cutting Steel

* Tire Cord Steel

Piano Wire Rods/ Bearing Steel/ Spring Steel/

Welding Steel/ Free-cutting Steel/

Tire Cord Steel/ Carbon Steel for Cold Heading & Forging,

Low-alloyed Steel/ Carbon Steel For Machine Structural Use

Rolling Mills’Strand

ReheatingFurnace

Strand

Type

Pass

Line Speed(m/sec)

Capacity (T/H)

Type

Production Capacity(10 thousand/year)

Up-Set TestTensileStrength

Area ReductionRatio

Segregation DecarburizationCleanness

LevelStructure

Low Carbon Steel Wire Rod

High Carbon Steel Wire RodPiano Wire Rods

Cold-Rolled SteelCarbon Steel for Machine

Structural UseFree-Cutting Steel

Bearing SteelSpring Steel

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Spring Steel

As a kind of ultra clean alloying steel with superior fatigue resistanceproperty, it is mostly used for engine valve springs, coil springs forsuspensions and stabilizer bar.

∙JIS SUP 3, 6, 7, 8, 9A, 10, 11A, 12, 13

∙SAE SAE9254, SAE9254HV

∙DIN 50CrV4, 54SiCrV6

Bearing Steel

It is used for the balls, rollers and races of bearings and is a kind ofultra clean high alloy steel materials with superior durability underheavy loading.

∙JIS SUJ 1-5

∙SAE 52100

Carbon Steel for Cold Heading & Forging

Carbon steel wire rods made from cold forging are used for a widerange of applications, such as automobile components and industrialmachinery, even as small as： a bolt, a nut or a screw in ways ofcold-rolling, forging and extrusion, etc.

∙POSCO POSCH6ASP

∙JIS SWRCH 6A-22A, 10K-50K

∙SAE 1006-1050

Piano Wire Steel

It is mainly used in applications for high-strength bead wires, LR PCsteel wires and music wires, etc. and is a kind of high carbon cleansteel with extendibility of micro-wire, high strength and superiorfatigue resistance.

∙JIS SWRS62-92A/B

∙POSCO POSCABLE 82, 86, 90

Tire Cord Steel

It is used for automobile tire reinforcement materials made ofstranded codes after a wire extending process that makes high carbonsteel wire rods into micro wires in a diameter with a range of0.4~0.15mm and a strict quality control is implemented to endure thestress incurred from high speed processing during manufacturing anda certain level of dynamic load on the tire.

∙POSCO POSCORD70S, 80S, 90, 90CR

∙AISI 1069, 1080

Welding Wire

It is necessary to micro-control the elements to guarantee the weldingperformance and the material characteristics of deposited metal. Andin order to secure the wire extendibility, TS bias control and slow-cooling of wire rods are applied. This product is used for CO2

electrodes, submerged and common ones, etc.

∙POSCO POSWELD1A, B, POSWELD2A, B, 2J, 2S

POSWELD4B, 4D, POSWELD23, 31, 41, 50, 60

∙JIS SWRY11-21, YSW11-41, YGW11-24

Low Carbon Steel

As a low carbon steel product containing 22% of C-content, it is usedfor producing various kinds of galvanized steel wires, nails and ironnets, etc.

∙JIS SWRM6-22

∙SAE SAE1006-1022

∙DIN D5-1, D9-1

∙ASTM A510

∙POSCO POSFIS 5M1, 6M1, 6B

Low-alloyed Steel

As a material used for tightening major machine parts and transmitting thedrive-power of such parts as high strength bolts, nuts and shafts, etc.,therefore it is made with a high strength product added with alloyingelements Cr, Ni and Mo, etc.

∙POSCO POSCM435~440C

∙JIS SCr415-445, SCM415-822, SNCM220-815,

SMn420-443, SMnC420-443

∙SAE 1513-1548, 4118-4161, 5115-5145, 8620-8645, 8740

Carbon Steel for Machine Structural Use

It is a kind of steel used for transmitting the drive-power of variouskinds of shafts of machine parts after being produced through hotworking environment and surface finishing process.

∙JIS S10-58C, SO9, 15, 20CK

∙SAE 1022~1060

High Tensile Strength Steel

As a kind of PC steel bar used for concrete utility poles and piles, etc,it is the carbon steel for machine structural application added withsmall quantity of Boron or large quantity of Si. And it has a highelastic constraint and good tension release capability compared tocommon steel products.

∙POSCO PSPC30B~35B, PSPC30Si-35Si, PSPC32SiB

∙SAE 10B30-35

High Carbon Steel

As a high carbon steel product, it is required to control the finepearlite in order to secure the maintenance of high strength and wireextendibility and is used for wire ropes, precision springs, bead wiresand common PC steel wires, etc.

∙JIS SWRH27-72 A/B

∙SAE 1026-1095

∙DIN D26-2, 95-2

Free-cutting Steel

As a kind of steel with which the machine capability is enhancedwith some added free-cutting P and S etc., it is used for somematerials of automobiles and home electronics parts.

∙POSCO POSCUT1A, POSCUT1S

∙JIS SUM22, 43

∙SAE 1213, 1144

MAIN USES M A I N U S E S

● When placing an order, please consult with the person in charge in order for us to comply with your customized request.

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■■ Material Characteristic Values

■■ Internal Quality Levels

■■ Quality Assurance of Dimensions and Surface Treatments

■ Non-metallic Inclusion Quality Assurance (ASTM E45 Method A)

■■ Quality Assurance

■■ Quality Assurance (≤≤14mmø, SWRCH45K as reference standard)

■■ Quality Assurance

Tire Cord Steel

Bearing Steel

Engine Valve Spring Steel

Suspension Spring Steel


QUALITYCONTROL ITEMS

Q U A L I T Y C O N T R O L I T E M S

* Ovality is measured by the difference between maximum diameter andminimum diameter of cross section in wire rod.

(1) Special Use: dedicated to the application of high-quality products, such as ball bearings of automobiles

Dimensions

Segregation Rating

Division

Special Use

Common Use

Division Pre-carburized depth Depth of Defect Ovality Diameter Tolerance

Decarburized Depth Internal Structure Cementite & Martensite

Non-metallic Inclusions

Dimensions F-decarburization Pre-decarburization Surface Defects

Center Segregation Cleanness Decarburization Surface Defects

Depth of Defect F-decarburization Fatigue Life (OT wire)

F-decarburization ≤0.02m

Pre-decarburization ≤0.15m

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Remarks: In case it is specified as a kind of killed steel, the letter, ‘K’, is attached after the end of the marking word.

Remarks: The carbon content can be specified to reduce by 0.01% from the maximum or increase by 0.01% from the

minimum that is specified in the table according to negotiations between the seller and the buyer.

■■ JIS

■■ SAE / AISI

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Low Carbon Steel

■■ JIS

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High Carbon Steel

MANUFACTURABLEDIMENSIONS

M A N U F A C T U R A B L E D I M E N S I O N S

● The product standards are subject to change. Please be sure to confirm the recent standards when making orders or to consult our associates.

SpecificaionChemical Compositions(%)



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Remarks: The maximum Cu content is 0.30%.

■■ SAE / AISI ■■ JIS

■■ SAE/DIN/POSCO

Spring Steel

■■ JIS

Bearing Steel


SpecificaionOthers

Others

Others

Chemical Compositions(%)



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19WIRE ROD

■■ JIS


■■ JIS

Piano Steel



20WIRE ROD

21WIRE ROD

■■ JIS

■■ SAE / AISI

�

Free-cutting Steel

■■ JIS

Low-alloyed Steel




22WIRE ROD

23WIRE ROD

■■ SAE / AISI ■■ JIS

Wire Rod for Welding Wire




24WIRE ROD

25WIRE ROD

■■ JIS

�

�

�

�

�

�

�

�

�

�

Carbon Steel for Machine Structural Use

■■ High Tensile Strength Steel

■■ Tire Cord Steel

■■ Wire Rod for Welding Wire

POSCO’s Unique Products

Remarks: 1. The Cu, Ni, Cr and Ni + Cr contents of the S09CK, S15CK and S20CK steel should not exceed each

level, 0.25%, 0.20%, 0.20% and 0.30% respectively and the contents of the other kinds of steel should

not exceed each level, 0.30%, 0.20%, 0.20% and 0.35% respectively.

2. In case that a buyer request a product analysis, the tolerances of the product analysis follow the

specifications listed in the table 3 of JIS G 0321.




SpecificaionDimensions

(mmø)Chemical Compositions(%)

Remark

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■■ Spark Plug

■■ Soft Magnetic Iron

■■ Micro-alloyed Steel

■■ Weather Resistance Steel

■■ Wire Rod for Oil Tempered Wire

■■ Free-cutting Steel

■■ Piano Steel for High Strength Bridge Cable

*PSW: Steel Wool Wires








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■■ Manufacturable Size Scales

■■ Standard Specifications

■ LABEL

● For the purpose of classifying the products in addition tomeeting client’s demand, color bar coding can be insertedinto the upper and lower parts of the tag respectively.

● To increase the visibility and identifiableness of the markedletters, an epoxy resin label (with white background) is usedand a metal tag laser marking is applied as well.

MANUFACTURABLESIZES AND PACKAGING

M A N U F A C T U R A B L E S I Z E S A N D P A C K A G I N G

● The available sizes are subject to change. Please consult with the POSCO contact person before ordering.

■■ Packing Methods

Exposed Packing End Pad Packing

Outer Covering Inner and Outer Covering

Export Mark

Specification

Usage Code

Product No.

Color Bar

Color Bar

Ordered Product Size Charge

Charge No.

Client Company Name

C & Mn Contents(for domestic use)

Specification ID No.

Wire Rod Mill

Wire Rod Mill 1

Wire Rod Mill 2

Wire Rod Mill 3

Division

Wire Rod Mill 1

Wire Rod Mill 2

Wire Rod Mill 3

Diameter Coil Weight Min. Inner Dia. / Max. Outer Dia. / Max. LengthCoil Direction

Counterclockwise

Unit Manufacturable Size Scales

Global POSCO Way

● For more information, please contact us at the addresses given below.● Seoul Office : POSCO Center, #892, Daechi 4-dong, Gangnam-gu, Seoul 135-777,

South Korea. Tel: +82-2-3457-0114● Internet Homepage : www.posco.com / www.steel-n.com

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