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Hard Drawn Steel Wire, Piano Wires
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Manufacturing Process
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ROD |
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Pickling & Coating |
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Drawing |
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In-line Patenting |
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Drawing |
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Product Inspection |
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In-line Patenting |
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Shipment |
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Superiority of Bukwang Products
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Only using selected quality rod for hard drawn steel wire and piano wire, Bukwang products
have an excellence in wire casting, and even tensile strength, and tensility.
It is being used for various applications as like frames of multipurpose, rolling, coiled springs, torsion springs, and twist springs.
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1 Products are extremely uniform in its quality and also have a superb tensility as well as excellent manageability in its treatment
as they are being produced with the latest equipments and facilities under the strict quality control of our most qualified engineers.
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2 So they are most superior in their straight as well as in the wire casting. No jump-ups, no bendings, no waves.
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3 Bukwang hard drawn steel wire and piano wire can be satisfied with the following international specifications.
KS D 3510 Steel Wire
KS D 7009 PC Steel Wire
JIS G 3521 Steel Wire
JIS G 3538 PC Steel Wire
ASTM A227 Steel wire cold drawn for mechanical springs
ASTM A407 Steel wire cold drawn for coiled type springs
ASTM A679 Steel wire, High tensile strength, Hard drawn, for mechanical springs
BS 1408 Patented cold drawn steel spring wire
BS 4637 Carbon steel wire for coiled springs
BS 5216 Patented cold drawn carbon steel wire for mechanical springs
DIN 17223 Round springs steel wire quality specification patented drawn spring wire made of unalloyed steel
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The Character of Product Quality ( Hard Drawn Steel Wire, High-Tensile Steel Wire and Piano Wire )
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1. Tensile strength per diameter(Unit : kgf/mm2)
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Diameter |
¡¡ Steel |
Wire |
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High-Tensile |
Piano |
Wire |
(mm) |
Class A |
Class B |
Class C |
¡¡Steel Wire |
Class A |
Class B |
0.32 |
175~205 |
205~235 |
235~265 |
265~290 |
245~270 |
270~295 |
0.35 |
" |
" |
" |
" |
" |
" |
0.40 |
170~200 |
200~230 |
230~260 |
260~285 |
240~265 |
265~290 |
0.45 |
165~195 |
195~225 |
225~255 |
255~280 |
235~260 |
260~285 |
0.50 |
" |
" |
" |
" |
" |
" |
0.55 |
160~190 |
190~220 |
220~250 |
250~275 |
230~255 |
255~280 |
0.60 |
160~185 |
185~215 |
215~245 |
245~270 |
225~250 |
250~275 |
0.65 |
" |
" |
" |
240~265 |
" |
" |
0.70 |
155~180 |
180~210 |
210~240 |
" |
220~245 |
245~270 |
0.80 |
" |
180~205 |
205~235 |
235~260 |
215~240 |
240~265 |
0.90 |
" |
" |
205~230 |
230~255 |
215~235 |
235~255 |
1.00 |
150~175 |
175~200 |
200~225 |
225~245 |
210~230 |
230~250 |
1.20 |
145~170 |
170~195 |
195~220 |
220~240 |
205~225 |
225~245 |
1.40 |
140~165 |
165~190 |
190~215 |
215~235 |
200~220 |
220~240 |
1.60 |
135~160 |
160~185 |
185~210 |
210~230 |
195~215 |
215~235 |
1.80 |
130~155 |
155~180 |
180~205 |
205~225 |
190~210 |
210~230 |
2.00 |
130~150 |
150~175 |
175~200 |
200~220 |
185~205 |
205~225 |
2.30 |
125~145 |
145~170 |
170~195 |
195~215 |
180~200 |
200~220 |
2.60 |
" |
" |
" |
190~210 |
" |
" |
2.70 |
120~140 |
140~165 |
165~190 |
" |
175~195 |
195~215 |
2.90 |
" |
" |
" |
185~205 |
" |
" |
3.20 |
" |
140~160 |
160~185 |
" |
170~190 |
190~210 |
3.50 |
" |
" |
160~180 |
180~200 |
170~185 |
185~200 |
4.00 |
" |
" |
" |
175~195 |
" |
" |
4.50 |
115~135 |
135~155 |
155~175 |
" |
165~180 |
180~195 |
5.00 |
" |
" |
" |
170~190 |
" |
" |
5.50 |
110~130 |
130~150 |
150~170 |
165~180 |
160~175 |
175~190 |
6.00 |
105~125 |
125~145 |
145~165 |
160~175 |
155~170 |
170~185 |
6.50 |
" |
" |
" |
155~170 |
" |
" |
7.00 |
100~120 |
120~140 |
140~160 |
150~165 |
150~165 |
165~180 |
8.00 |
" |
" |
" |
155~170 |
" |
¡ª |
9.00 |
95~115 |
115~135 |
135~155 |
150~165 |
145~160 |
¡ª |
10.0 |
" |
" |
" |
145~160 |
" |
¡ª |
11.0 |
¡ª |
110~130 |
130~150 |
¡ª |
¡ª |
¡ª |
12.0 |
¡ª |
" |
" |
¡ª |
¡ª |
¡ª |
13.0 |
¡ª |
105~125 |
125~145 |
¡ª |
¡ª |
¡ª |
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2. Tolerance of diameter and ovality
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Tolerance |
Ovality |
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¡¡Diameter |
Steel Wire, High-Tensile Steel Wire |
Piano Wire |
Steel Wire, High-Tensile Steel Wire |
Piano Wire |
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JIS |
Our Company |
JIS |
Our Company |
JIS |
Our Company |
JIS |
Our Company |
0.32 ~ 0.50 |
¡¾0.015 |
¡¾0.015 |
¡¾0.008 |
¡¾0.008 |
Not Stated |
0.015 |
0.008 |
0.008 |
0.50 ~ 1.00 |
¡¾0.020 |
" |
¡¾0.010 |
" |
" |
0.015 |
0.010 |
0.008 |
1.00 ~ 2.00 |
¡¾0.030 |
¡¾0.020 |
¡¾0.015 |
¡¾0.015 |
" |
0.020 |
0.015 |
0.015 |
2.00 ~ 2.30 |
¡¾0.040 |
" |
¡¾0.020 |
" |
" |
0.020 |
0.020 |
0.015 |
2.30 ~ 3.20 |
" |
¡¾0.030 |
" |
" |
" |
0.030 |
0.020 |
0.015 |
3.20 ~ 3.70 |
¡¾0.050 |
" |
¡¾0.030 |
¡¾0.020 |
Not Stated |
0.030 |
0.030 |
0.020 |
3.70 ~ 4.50 |
" |
¡¾0.040 |
" |
" |
" |
0.040 |
0.030 |
0.020 |
4.50 ~ 5.50 |
" |
¡¾0.050 |
" |
" |
" |
0.050 |
0.030 |
0.020 |
5.50 ~ 8.50 |
¡¾0.060 |
" |
¡¾0.040 |
¡¾0.030 |
" |
0.050 |
0.040 |
0.030 |
8.50 ~ 9.00 |
" |
" |
¡¾0.050 |
¡¾0.040 |
" |
0.050 |
0.050 |
0.040 |
9.00 ~ |
" |
" |
" |
" |
Not Stated |
0.050 |
0.050 |
0.040 |
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3. Twist frequency, conditions of section and twist
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A. Steel wire & high tensile steel wire
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J I S |
Our company |
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Diameter up to 2.00mm : 20 times or more |
22 times or more |
Twist frequency |
From 2.00mm to 3.50mm : 15 times or more |
17 times or more |
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From 3.50mm to 6.00mm : 10 times or more |
12 times or more |
Condition of section |
The first broken section should be at right angled with wire axis. |
Same as JIS |
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No cracks, no severe grooves should be found. |
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Condition of twist |
No vertical cracks, no grooves, and no partial twist of severity |
Same as JIS |
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should be found. |
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B. Piano wire
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¡¡ |
J I S |
Our company |
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DIA 0.70mm - 2.00mm : above 25 times |
Above 25 times |
Twist frequency |
2.00mm - 3.20mm : above 20 times |
Above 22 times |
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3.50mm - 6.00mm : above 15 times |
Above 17 times |
Condition of section |
The first broken section should be at right angled with wire axis. |
Same as JIS |
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No cracks, no severe grooves should be found. |
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Condition of twist |
Total length should be equally twisted. Scratches and partial |
Same as JIS |
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twists should not be found. Also, it shouldn't be a spiral type. |
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4. Inner Dia. of Coil Per Diameter of Wire, Weight Per Coil
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Diameter(mm) |
Coil Inner Dia.(mm) |
Weight Per Coil(kg) |
0.32 - 0.54 |
130 - 140 |
30 |
0.55 - 0.99 |
180 - 200 |
50 |
1.00 - 1.49 |
280 - 300 |
100 |
1.50 - 1.99 |
380 - 410 |
100 |
2.00 - 2.89 |
480 - 510 |
100 |
2.90 - 6.99 |
630 - 660 |
100 - 250 |
7.00 - 12.2 |
630 - 660 |
150 - 250 |
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It is used for springs ( Pull, Push, Bed & Etc ), Bolts, Nuts, Washers, And Etc.
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From the beginning of wire rod warehousing to the final shipping of the products,
all of the required tests and inspections are being effected to make sure quality products.
And it is guaranteed to meet the various needs of our customers.
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Prestressed Concrete Wire & Strand
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Construction |
Diameter (mm) |
Shape |
Plain Round Wire |
2.9 ~ 9.0 |
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2-PLY Wire |
2.9 |
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3-PLY Wire |
2.9 |
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7-PLY Wire |
6.2 ~15.7 |
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Available Specifications & Characteristics
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(1) All international specifications available ;
¡¤ KS D7002 Uncoated stress-relieved steel wire and strands for prestressed concrete.
¡¤ JIS G3536 Uncoated stress-relieved steel wire and strands for prestressed concrete.
¡¤ ASTM A-416 Steel strand, uncoated 7-wire for prestressed concrete.
¡¤ BS-5896 High tensile steel wire & strand for the prestressing of concrete.
(2) Up-date facilities guarantee the quality even and life of concrete longer.
(3) Due to the good mechanical properties, the quantity of PC is less required.
(4) Having a merit of better adhesion to concrete, higher yielding point and lower
value of relaxation, the materials are to be used for multi-purposes.
(5) Both low relaxation and normal relaxation are available.
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Pile | Concrete Pavement |
Humn Pipe | Oil Tank |
Sleeper | Pole |
Column | Plate Slab |
Bridge-Beam | Sheet Pile |
Gas Tank | Building-Beam |
Anchor for Cable Suspension | Water Tank |
Anchor for Rock Suspension | Atomic Power Station |
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Standard Packing
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Construction |
Packing Style |
Nominal DIA(mm) |
Inner DIA (mm) |
Packing WT(kg) |
Length (m) |
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5 |
1480 |
500 |
3,244 |
Plain Round Wire |
Coil |
6 |
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2,252 |
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7 |
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1,655 |
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8 |
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1,267 |
3-PLY Wire |
Coil |
2.9 |
1480 |
450 |
2,885 |
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6.2 |
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10,989 |
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7.9 |
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6,825 |
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9.3 |
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4,938 |
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9.5 |
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4,629 |
7-Wire Strand |
Reeless |
10.8 |
800 |
2000 |
3,663 |
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11.1 |
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3,448 |
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12.4 |
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2,743 |
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12.7 |
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2,583 |
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15.2 |
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1,816 |
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In case of 7-wire strand, max 3,000kgs/reeless is available upon request.
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