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Cold Heading Quality Wire
PRODUCT INTRODUCTION
Cold Heading Quality Wires are used for the production of fasteners including bolts, nuts, and screws. Fasteners have traditionally been manufactured by a hot working method or machining of metals. However, the trend is moving towards using the cold working process to enhance productivity and to keep the cost down. Cold heading quality wires, therefore, possess excellent workability and surface quality for the cold working process.
APPLICATIONS
Applications
  1. Automotive
    * Engine: cylinder head bolt, piston rod, spark plug shell, etc.
    * Steering system: ball joint stud, tie rod pin, pinion etc.
    * Wheel: hub bolt, nut, etc.
  2. Airplanes : high-tension bolts for wings
  3. Construction : fastener bolts for construction purposes
  4. Bearing : ball bearing, roller bearing etc.
  5. Industrial machines : fastener bolt, nut, screw, rivet, nipple
  6. Electronic parts : material for switch relay
Classification by use
Application Material Production process
Ball & Roller Bearing SUJ2 PASAIP
Ball Housing SWRCH45K PSASAIP
Ball Stud SCM415H~440H PASAIP
Boxer Wrench SWRCH45FCr SAIP
SCM415H PASAIP
Chain Pin SCM415H~435 AIP
Cylinder Head Bolt SCM435H AIP/PASAIP
Drill Piece SWRCH18A~22A SAIP
Armature Shaft SWRCH45K R)AIP
SWRCH45FCr SAIP
Flange Bolt & Nut SWRCH25K~45K SAIP/PSASAIP
SCM435 PASAIP
SWRCH10A HD
Hex. Bolt SCM435 AIP/PASAIP
SWRCH45K SAF/SAIP
Hub Bolt & Nut SCM435 AIP/PASAIP
Lead Wire SWRCH6A~8A HD
Nipple SUM24L SAIP
Piston Pin SCM415H~435H PASAIP
Screw SWRCH6A~10A HD/HRPP
Start Motor Parts 10B21 SAIP
SWRCH45K SAIP
Tire Rod Pin SWRCH45K AIP/SAIP
Tire Spoke SCM435 PASAIP
Wheel Nut Wrench SWRCH45K SAIP
Wrench Bolt SWRCH45K SAIP
SCM435 AIP
General Hexagon Bolt SWRCH10A HD
SWRCH25K AIP
Classification by production process
Symbol Process  
HD PC-D PC : Pickling & Coating

LA : Low Temperature Annealing

A : Annealing

SA: Spheroidized Annealing

D :Drawing
RA PC-A-PC
SA PC-SA-PC
(R)AIP PC-A-PC-D
(S)AIP PC-SA-PC-D
SAF PC-D-SA-PC
SAIP PC-D-SA-PC-D
PASAF LA-PC-D-SA-PC
PASAIP LA-PC-D-SA-PC-D
PSASAIP PC-SA-PC-D-SA-PC-D
Pickling and coating
The hot-rolled coil or wire rod passes through the pickling line, where hydrochloric acid solution is used to remove surface scale. A lubrication film forms on the surface to reduce the coefficient of friction in the drawing and cold working process.
Intermediate drawing
This process produces half-finished products for the following stage. It improves the ratio of spheroidization during annealing.
Spheroidized Annealing
This annealing process produces Spheroidized carbides, which enables cold works. Once inserted into the heat treatment furnace, it undergoes heating, fissuring and cooling.
Skin pass
The wire drawing machine produces half-finished coils to meet the customers' needs in terms of the size and mechanical properties of products.
PRODUCT AVAILABILITY
Wire drawing machine
Classification Quantity Wire Drawing Range (mm) Capacity (T/year) Maker Producer
Large size 3 15 ~ 36 65,300 EIWA, Youngsin, Singee
Medium-large size 3 10 ~ 20 38,500 Koch, Youngsin, Singee
Medium size 5 6 ~ 13 31,300 EIWA, Youngsin, Singee
Small size 7 2 ~ 8 26,100 Miyajaki, BUSANSANGEE
Total 18 2 ~ 36 161,200  
Wire drawing machine
Classification Quantity Charge Quantity Capacity (T/year) Capacity (T/year) Producer
Bell Type 3 15 ~ 36 12,000 DAIDO, Sam Cheon Ri
S T C 8 10 ~ 20 79,200 DAIDO, Dongbu Steel
Continuous Furnace 1 6 ~ 13 30,000 LOI
Total 12 2 ~ 36 121,200  
Pickling and film equipment
Classification Quantity Capacity (T/year) Producer
Manual Type 2 144,000 Self manufacture
STEEL TYPE QUALITY FEATURES
Classification by mechanical properties
Grade Process T/S(Kg/㎟)
(Tensile strength)
HRB
(Hardness)
Remarks
SWCH25K SA 46 under 72 under SKP:5% AVD.WD:15% AVG.
(R)AIP 72 under 97 under
(S)AIP 68 under 94 under
SAF 46 under 72 under
SAIP 50 under 85 under
SWCH45K SA 54 under 82 under SKP:5% AVD.WD:15% AVG.
(R)AIP 72 under 97 under
(S)AIP 68 under 94 under
SAF 54 under 86 under
SAIP 56 under 92 under
PSASAIP 54 under 86 under
SCM435 SA 58 under 86 under SKP:5% AVD.WD:15% AVG.
(R)AIP 75 under 99 under
(S)AIP 72 under 97 under
SAF 56 under 92 under
SAIP 58 under 92 under
PSASAIP 56 under 90 under
Classification by chemical components
Grade Chemical Composition (%) Remarks
C Si Mn P S Al
SWRCH6A 0.08 max 0.10 max 0.30 ~ 0.60 0.030 max. 0.035 max. 0.02 min. Aluminium
Killed Steel
SWRCH8A 0.10 max 0.10 max 0.30 ~ 0.60 0.030 max. 0.035 max. 0.02 min.
SWRCH10A 0.08 ~ 0.13 0.10 max 0.30 ~ 0.60 0.030 max. 0.035 max. 0.02 min.
SWRCH12A 0.10 ~ 0.15 0.10 max 0.30 ~ 0.60 0.030 max. 0.035 max. 0.02 min.
SWRCH15A 0.13 ~ 0.18 0.10 max 0.30 ~ 0.60 0.030 max. 0.035 max. 0.02 min.
SWRCH16A 0.13 ~ 0.18 0.10 max 0.60 ~ 0.90 0.030 max. 0.035 max. 0.02 min.
SWRCH18A 0.15 ~ 0.20 0.10 max 0.60 ~ 0.90 0.030 max. 0.035 max. 0.02 min.
SWRCH19A 0.15 ~ 0.20 0.10 max 0.70 ~ 1.00 0.030 max. 0.035 max. 0.02 min.
SWRCH20A 0.18 ~ 0.23 0.10 max 0.30 ~ 0.60 0.030 max. 0.035 max. 0.02 min.
SWRCH22A 0.18 ~ 0.23 0.10 max 0.70 ~ 1.00 0.030 max. 0.035 max. 0.02 min.
SWRCH10K 0.08 ~ 0.13 0.10 max 0.30 ~ 0.60 0.030 max. 0.035 max. - Killed Steel
SWRCH12K 0.10 ~ 0.15 0.10 ~ 0.35 0.30 ~ 0.60 0.030 max. 0.035 max. -
SWRCH18K 0.15 ~ 0.20 0.10 ~ 0.35 0.60 ~ 0.90 0.030 max. 0.035 max. -
SWRCH22K 0.18 ~ 0.23 0.10 ~ 0.35 0.70 ~ 1.00 0.030 max. 0.035 max. -
SWRCH25K 0.22 ~ 0.28 0.10 ~ 0.35 0.30 ~ 0.65 0.030 max. 0.035 max. -
SWRCH35K 0.32 ~ 0.38 0.10 ~ 0.35 0.60 ~ 0.90 0.030 max. 0.035 max. -
SWRCH38K 0.35 ~ 0.41 0.10 ~ 0.35 0.60 ~ 0.90 0.030 max. 0.035 max. -
SWRCH40K 0.37 ~ 0.43 0.10 ~ 0.35 0.60 ~ 0.90 0.030 max. 0.035 max. -
SWRCH45K 0.42 ~ 0.48 0.10 ~ 0.35 0.60 ~ 0.90 0.030 max. 0.035 max. -
SWRCH48K 0.45 ~ 0.51 0.10 ~ 0.35 0.60 ~ 0.90 0.030 max. 0.035 max. -
SWRCH50K 0.47 ~ 0.53 0.10 ~ 0.35 0.60 ~ 0.90 0.030 max. 0.035 max. -
PRODUCT GUARANTEE AVAILABILITY
Dimension
Production process symbol Size Tolerance Out-of-round
R, RA, SA 10 or less
10 ~ 16
16 more than
± 0.4
± 0.4
± 0.5
0.4 or less
0.5 or less
0.6 or less
AIP, SAIP
PASAIP
PSASAIP
10 or less
10 ~ 16
more than16
0, -0.03
0, -0.04
0, -0.05
0.010 or less
0.015 or less
0.025 or less
SAF,
PASAF
10 or less
10 ~ 16
more than16
± 0.3
± 0.4
± 0.5
0.030 or less
0.040 or less
0.050 or less
Hexagonal 10 or less
10 ~ 16
more than16
0, -0.08
0, -0.09
0, -0.10
0.020 or less
0.025 or less
0.030 or less
Decarburization Depth
Symbol Carbon steel Alloy steel
production process size (mm) DM-F DM-T DM-F DM-T
RA, SA 10 or less
10 more than
0.04
0.05
0.15
0.20
0.04
0.05
0.15
0.20
SAF,
PASAF
8 or less
8 ~ 14
14 ~ 20
20 more than
0.04
0.05
0.06
0.07
0.15
0.20
0.20
0.25
0.03
0.04
0.05
0.06
0.12
0.15
0.20
0.25
SAIP,
PASAIP
8 or less
8 ~ 14
14 ~ 20
20 more than
0.03
0.04
0.05
0.06
0.12
0.15
0.20
0.20
0.02
0.03
0.04
0.05
0.10
0.12
0.15
0.20
* DM-F : Decarburization Microscope Ferrite
* DM-T : Decarburization Microscope Total
Spheroidized Ratio
Production process symbol Spheroidized Ratio (%)
RA, (R)AIP -
SA, (S)AIP, SCD 70 ± 10
SAF, SAIP, PASAF, PASAIP, WSCD 80 Over
PSASAIP, SWSCD 90 Over
Spheroidized ratio limit sample (Steel type:SUJ2)
Spheroidized Ratio 90% Spheroidized Ratio 90% Spheroidized Ratio 90%
CHQ Wire: PSASAIP
CD Bar: SWSCD
CHQ Wire: SAF/(PA)SAIP
CD Bar: WSCD
CHQ Wire: SAPP
CD Bar: SCD
PACKING
Packing conditions
Classification Packing Contents
1 Unpacked Strapping at least 4 points with steel bands or steel wire. Protectors attached at each strapped point.
2 Blanket Packing Strapping at least 4 points with steel bands. Blanket shape packing material.
3 Bundle A bundle of 2 or more coils. Strapping at least 3 points with steel bands.
4 Wrapping and Bundling Bundle, packing with Polypropylene sandbags. Strapping at least 2 points with steel bands.
5 Polypropylene sandbags Strapping at least 4 points with steel bands. Packing material : Polypropylene sandbags.
6 Carrier Piling products on carriers. Vinyl or Polypropylene sandbags.
7 Double packing Strapping at least 4 points with steel bands. Double packing material.
Packing and tag color for products
Classification Package Tape Product Tag
HD product - - White
Commercial Steel White White White
Carbon Steel Yellow Yellow Yellow
Alloy Steel Blue Blue Blue
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