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Cold Heading Quality Wires are used for the production
of fasteners including bolts, nuts, and screws. Fasteners
have traditionally been manufactured using the thread
cutting or hot working method. 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 to take place. |
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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.
Airplanes : High-tension bolts for wings
Construction : Fastener bolts for construction purposes
Bearing : BaBall Bearing, Roller Bearing etc.
Industrial machine : Fastener Bolt, Nut, Screw, Rivet,
Nipple
Electronic parts : Material for Switch Relay |
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| Application |
Material |
Manufacturing
process |
| Ball & Roller Bearing |
SUJ2 |
PASAIP |
| Ball Housing |
SWRCH45K |
PSASAIP |
| Ball Stud |
SCM415H~440 |
PASAIP |
| Boxer Wrench |
SCM415H |
PASAIP |
| Chain Pin |
SCM415H~435 |
AIP |
| Cylinder Head Bolt |
SCM435H |
AIP/PASAIP |
| Electronic nut |
SWRCH18A~22A |
SAIP |
| Armature Shaft |
SWRCH45K |
R)AIP |
| Flange Bolt & Nut |
SWRCH35K~45K |
SAIP/PSASAIP |
| SCM435 |
PASAIP |
| SWRCH10A |
HD |
| Hex. Bolt |
SCM435 |
AIP/PASAIP |
| SWRCH45K |
SAF/SAIP |
| Hub Bolt & Nut |
ML20MNTIB/SCM435 |
SAIP/ PASAIP |
| Lead Wire |
SWRCH6A~8A |
HD |
| Piston Pin |
SCM415H~435H |
PASAIP |
| Screw/Nut |
SWRCH6A~10A |
HD/SAIP |
| Start Motor Parts |
10B21 |
SAIP |
| SWRCH45K |
SAIP |
| Tire Rod Pin |
SWRCH45K |
AIP/SAIP |
| Tire Spoke |
SCM 435 |
PASAIP |
| Wheel Nut Wrench |
SWRCH45K |
SAIP |
| Wrench Bolt |
SWRCH45K |
SAIP |
| Hex head bolt |
SWRCH10A |
HD |
| SWRCH25K |
AIP |
| Spark plug |
SWRCH8A~10A |
SAIP |
| Cold rivet used in the train |
45MN2 |
PASAIP |
| Advanced hand implement |
50BV30 |
SAIP |
| Flange Bolt & Nut |
SCM440 |
PASAIP |
| Bolt used in heavy truck |
SCR440 |
PASAIP |
| Bolt used in engine connecting-rod |
30CRMNSIA |
PASAIP |
| Start Motor Parts |
10B30 |
SAIP |
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| Symbol |
Process |
PC : Pickling
& Coating LA : Low Temperature Annealing A :
Annealing SA: Spheroidized Annealing |
| HD |
PC-D |
| RA |
PC-RA |
| SA |
PC-SA |
| (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 |
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The hot-rolled coil or wire rod passes through the pickling
line, where hydrochloric acid solution is used to remove
surface scale for clean surface finish before further
processing and to form a lubrication film on the surface
to reduce the coefficient of friction in the drawing and
cold working process.
The Gantry Crane moves between the tank during the process.
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This process which produces half-finished products for
the following stage improves the spherodized ratio during
spheroidized annealing. The wire drawing machine composed
of (Supply Stand + Drawing Drum + Take up) stages produces
half-finished coil products. |
This annealing process with the purpose of obtaining spheroidized
carbides facilitates the cold works. Once inserted in
the heat treatment furnace, the process takes place in
the order of controlled heating up to a given time, temperature
and furnace atmosphere, along with maintenance at such
temperature during a certain period and cooling controlled
in accordance with the purpose intended. This process
is controlled by automatic heat cycle. Dongbu Steel offers
54 heat cycles. |
The hot-rolled coil or wire rod passes through the pickling
line, where hydrochloric acid solution is used to remove
surface scale for clean surface finish before further
processing and to form a lubrication film on the surface
to reduce the coefficient of friction in the drawing and
cold working process.
The Gantry Crane moves between the tank during the process.
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The wire drawing machine produces half-finished coils
where products meet the customers' needs in terms of the
size and mechanical properties of products. |
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| Class
Symbol |
Process |
T/S
(Tensile strength)
|
HRB
(Hardness) |
Remarks |
| SWCH25K |
SA |
46 under |
72 under |
SKP:5% max.
WD:15% max. |
| (R)AIP |
72 under |
97 under |
| (S)AIP |
68 under |
94 under |
| SAF |
46 under |
72 under |
| SAIP |
50 under |
85 under |
| SA |
54 under |
82 under |
| (R)AIP |
72 under |
97 under |
| SWCH45K |
(S)AIP |
68 under |
94 under |
SKP:5% max.
WD:15% max. |
| SAF |
54 under |
86 under |
| SAIP |
56 under |
92 under |
| PSASAIP |
54 under |
86 under |
| SCM435 |
SA |
58 under |
86 under |
SKP:5% max
WD:15% max |
| (R)AIP |
75 under |
99 under |
| (S)AIP |
72 under |
97 under |
| PASAF |
56 under |
92 under |
| PASAIP |
56 under |
92 under |
| PSASAIP |
56 under |
90 under |
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| Class
Symbol |
Chemical
Composition(%) |
Remarks |
| C |
Si |
Mn |
P |
S |
AI |
| SWRCH 6A |
0.08 max |
0.10 max |
0.30-0.60 |
0.030 max. |
0.035 max. |
0.02 min. |
Aluminium
Killed Steel |
| SWRCH 8A |
0.10 max |
0.10 max |
0.30-0.60 |
0.030 max. |
0.035 max. |
0.02 min. |
| SWRCH 10A |
0.08-0.13 |
0.10 max |
0.30-0.60 |
0.030 max. |
0.035 max. |
0.02 min. |
| SWRCH 12A |
0.10-0.15 |
0.10 max |
0.30-0.60 |
0.030 max. |
0.035 max. |
0.02 min. |
| SWRCH 15A |
0.13-0.18 |
0.10 max |
0.30-0.60 |
0.030 max. |
0.035 max. |
0.02 min. |
| SWRCH 16A |
0.13-0.18 |
0.10 max |
0.60-0.90 |
0.030 max. |
0.035 max. |
0.02 min. |
| SWRCH 18A |
0.15-0.20 |
0.10 max |
0.60-0.90 |
0.030 max. |
0.035 max. |
0.02 min. |
| SWRCH 19A |
0.15-0.20 |
0.10 max |
0.70-1.00 |
0.030 max. |
0.035 max. |
0.02 min. |
| SWRCH 20A |
0.18-0.23 |
0.10 max |
0.30-0.60 |
0.030 max. |
0.035 max. |
0.02 min. |
| SWRCH 22A |
0.18-0.23 |
0.10 max |
0.70-1.00 |
0.030 max. |
0.035 max. |
0.02 min. |
| SWRCH 10A |
0.18-0.23 |
0.10 max |
0.30-0.60 |
0.030 max. |
0.035 max. |
- |
| SWRCH 12A |
0.10-0.15 |
0.10-0.35 |
0.30-0.60 |
0.030 max. |
0.035 max. |
- |
| SWRCH 15A |
0.13-0.18 |
0.10-0.35 |
0.30-0.60 |
0.030 max. |
0.035 max. |
- |
| SWRCH 16A |
0.13-0.18 |
0.10-0.35 |
0.60-0.90 |
0.030 max. |
0.035 max. |
- |
| SWRCH 17A |
0.15-0.20 |
0.10-0.35 |
0.30-0.60 |
0.030 max. |
0.035 max. |
- |
| SWRCH 18A |
0.15-0.20 |
0.10-0.35 |
0.60-0.90 |
0.030 max. |
0.035 max. |
- |
| SWRCH 20A |
0.18-0.23 |
0.10-0.35 |
0.30-0.60 |
0.030 max. |
0.035 max. |
- |
| SWRCH 22A |
0.18-0.23 |
0.10-0.35 |
0.70-1.00 |
0.030 max. |
0.035 max. |
- |
Killed Steel |
| SWRCH 24A |
0.19-0.25 |
0.10-0.35 |
1.35-1.65 |
0.030 max. |
0.035 max. |
- |
| SWRCH 25A |
0.22-0.28 |
0.10-0.35 |
0.30-0.65 |
0.030 max. |
0.035 max. |
- |
| SWRCH 27A |
0.22-0.29 |
0.10-0.35 |
1.20-1.50 |
0.030 max. |
0.035 max. |
- |
| SWRCH 30A |
0.27-0.33 |
0.10-0.35 |
0.60-0.90 |
0.030 max. |
0.035 max. |
- |
| SWRCH 33A |
0.30-0.36 |
0.10-0.35 |
0.60-0.90 |
0.030 max. |
0.035 max. |
- |
| SWRCH 35A |
0.32-0.38 |
0.10-0.35 |
0.60-0.90 |
0.030 max. |
0.035 max. |
- |
| SWRCH 38A |
0.35-0.41 |
0.10-0.35 |
0.60-0.90 |
0.030 max. |
0.035 max. |
- |
| SWRCH 40A |
0.37-0.43 |
0.10-0.35 |
0.60-0.90 |
0.030 max. |
0.035 max. |
- |
| SWRCH 41A |
0.36-0.44 |
0.10-0.35 |
1.35-1.65 |
0.030 max. |
0.035 max. |
- |
| SWRCH 43A |
0.40-0.46 |
0.10-0.35 |
0.60-0.90 |
0.030 max. |
0.035 max. |
- |
| SWRCH 45A |
0.42-0.48 |
0.10-0.35 |
0.60-0.90 |
0.030 max. |
0.035 max. |
- |
| SWRCH 48A |
0.45-0.51 |
0.10-0.35 |
0.60-0.90 |
0.030 max. |
0.035 max. |
- |
| SWRCH 50A |
0.47-0.53 |
0.10-0.35 |
0.60-0.90 |
0.030 max. |
0.035 max. |
- |
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| Manufacturing
process |
Size |
Tolerance |
Out-of-round |
| symbol |
| R, RA, SA |
10 or less |
¡¾ 0.4 |
0.4 or less |
| 10 ~ 16 |
¡¾ 0.4 |
0.5 or less |
| more than 16 |
¡¾ 0.5 |
0.6 or less |
| AIP, SAIP |
10 or less |
0, -0.03 |
0.01 or less |
| PASAIP |
10 ~ 16 |
0, -0.04 |
0.015 or less |
| PSASAIP |
more than 16 |
0, -0.05 |
0.025 or less |
| SAF,PASAF |
10 or less |
¡¾ 0.3 |
0.03 or less |
| 10 ~ 16 |
¡¾ 0.4 |
0.04 or less |
| more than 16 |
¡¾ 0.5 |
0.05 or less |
| Hexagonal |
10 or less |
0, -0.08 |
0.02 or less |
| 10 ~ 16 |
0, -0.09 |
0.025 or less |
| more than 16 |
0, -0.10 |
0.03 or less |
|
| symbol |
carbon
steel |
alloy
steel |
| manufacturing |
Size(mm) |
DM-F |
DM-T |
DM-F |
DM-T |
| process |
| RA, SA |
10 or less |
0.04 |
0.15 |
0.04 |
0.15 |
| more than 10 |
0.05 |
0.20 |
0.05 |
0.20 |
| SAF,PASAF |
8 or less |
0.04 |
0.15 |
0.03 |
0.12 |
| 8 ~ 14 |
0.05 |
0.20 |
0.04 |
0.15 |
| 14 ~ 20 |
0.06 |
0.20 |
0.05 |
0.20 |
| more than 20 |
0.07 |
0.25 |
0.06 |
0.25 |
SAIP
PASAIP |
8 or less |
0.03 |
0.12 |
0.02 |
0.10 |
| 8 ~ 14 |
0.04 |
0.15 |
0.03 |
0.12 |
| 14 ~ 20 |
0.05 |
0.20 |
0.04 |
0.15 |
| more than 20 |
0.06 |
0.20 |
0.05 |
0.20 |
* DM-F : Decarburization Microscope Ferrite
* DM-T : Decarburization Microscope Total |
| Manufacturing
process symbol |
Spheroidized
Ratio(%) |
| RA, (R)AIP |
- |
| SA, (S)AIP, SCD |
70 ¡¾ 10 |
SAF, SAIP, PASAF, PASAIP,
SWCD |
80 Over |
| PSASAIP, SWSCD |
90 Over |
|
| Steel
type |
Manufacturing |
Tensile
strength |
Reduction
of area |
Remarks |
| process symbol |
(Kg/§±) |
(%)
|
| SWCH45K |
RA |
64 or less |
60 or more |
Reduction ratio
12%Max |
| SA |
60 or less |
63 or more |
| (R)AIP |
72 or less |
55 or more |
| (S)AIP |
68 or less |
60 or more |
| SAF |
58 or less |
65 or more |
| SAIP |
62 or less |
62 or more |
| PSASAIP |
56 or less |
65 or more |
|
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| Spheroidized Ratio 90% |
Spheroidized Ratio 80% |
Spheroidized Ratio 70% |
| CHQ Wire : PSASAIP |
CHQ Wire : SAIP/PASAIP |
CHQ Wire : SAPP |
| CD Bar : SWSCD |
CD Bar : WSCD |
CD Bar : SCD |
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|
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| Classification |
Packing |
Contents |
| 1 |
Unpacked |
Strapping at least 4 points with
steel bands or steel wire |
| Protectors attached at each strapped
points |
| 2 |
Blanket |
Strapping at least 4 points with
steel bands |
| packing |
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 |
Strapping at least 4 points with
steel bands |
| sandbags |
Packing material: Polypropylene
sandbags |
| 7 |
Carrier |
Piling products on carriers |
| Vinyl or Polypropylene sandbags |
| 8 |
Double
|
Strapping at least 4 points with
steel bands |
| packing |
Double packing material |
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| Classification |
Packaging |
Tape |
Product
Tag |
| HD Product |
- |
- |
White |
| Commercial Steel |
White |
White |
White |
| Carbon Steel |
White |
Yellow |
Yellow |
| Alloy Steel |
White |
Blue |
Blue |
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