www.dongbuspecialsteel.com
02 - About Dongbu Group
Pride in Quality 04 - Plant 06 - Facilities 10 - Technology
Pride in Diversity 14 - Automobile 18 - Heavy Industry 20 - Construction 21 - Electronic APPLIANCES
Pride in Product 24 - CHQ Wire 28 - CD Bar (coil bar) 32 - CD Bar (bar bar) 34 - QT Bar 36 - Peeled Bar
Dongbu Special Steel is a leading specialty steel company in Korea since completing Pohang Works in 1979, and has contributed to a wide range of the nation’s backbone industries such as automobile, construction, home appliances, machinery and shipbuilding. In 1984, Dongbu Special Steel produced CHQ Wire (Cold Heading Quality Wire) with its own technologies for the first time in Korea. Its CHQ Wire is recognized for its outstanding quality with excellent annealing and coating. Its CD Bar (Cold Drawn Bar) also boasts leading competitiveness in Korea in terms of straightness, surface quality, and available sizes for supply. In addition to its pride in such high quality products, Dongbu Special Steel is growing into “a Global Leader in the Specialty Steel business” by developing new technologies and products and making aggressive facilities investments.
38 - Information
History of Dongbu Special Steel Completed Pohang Works
Began producing CHQ Wire and CD Bar
Increased production capacity to 120,000 tons per year
Obtained certification to use KS and JIS marks on CD Bar
Reached 1 million tons of cumulative production
1979
1984
1987
1989
1992
2004
2003
Installed company- Obtained environmental system wide ERP system certification ISO 14001 Expanded facilities for middlediameter steel bars and STC Annealing Furnace
contents
Obtained ISO 9002 quality certification Began CTL (Cut to Length) production
1994
2002
1999
1997
Obtained ISO 9001, ISO/TS 16949, and QS9000 certifications
Reached 2 million tons of cumulative production
Began operation of the Continuous Annealing Furnace
Expanded STC Annealing Furnace and rationalized facilities
2007
2008
Installed APS system
Began operation Expanded facilities of the Hydrogen for Cold Drawn Bars Bell-type Annealing (~58mm) Furnaces
2009
Increased production capacity to 180,000 tons per year
2011
2012
2013
Dongbu Special Steel spun off from Dongbu Steel
Installed Draw Bench, QT Line
Installed Peeling Machine
Expanded Automatic Pickling Lines and the largest-diameter wire drawing machine (~52mm)
About Dongbu Group
Dongbu Special Steel is an affiliate of the Dongbu Group which, through entrepreneurship and innovation, has grown into one of the top ten conglomerates in Korea after only 30 years since being established. The Dongbu Group operates in the seven business segments as listed below and has firmly established its affiliates as Korea’s representative players in their respective industries and businesses. The Dongbu Group is taking another leap forward to become a specialist global corporation by securing future growth engines centered on hi-tech businesses.
Dongbu’s Seven Business Segments and Subsidiary Company Agriculture · Health · Distribution Steel · Metal · Chemical
IT · Electronics
Steel · Metal · Chemical
Developing into a specialist global corporation with world-class competitiveness in such businesses as electric arc furnace mill-based steelmaking, ferro-alloy, specialty steel, metal material, and chemical and materials, etc.
Agriculture · Health · Distribution
Emerging as world-class companies with unique specialties and leadership in the industries of the future, which combine primary industries (key agricultural materials including seeds, crop protection products, fertilizers, and animal pharmaceuticals), secondary industries (processing of agricultural, fisheries and livestock products), and tertiary industries (distribution, foods, health, bio and plantation, and forestry).
IT · Electronics
Corporate Social Responsibility
The Dongbu Group’s Seven Business Segments
Insurance · Securities · Banking
Logistics · Passenger Transport · Contents
Construction · Energy · Real Estate Development
Korea’s Leading Eco-Friendly Integrated Steel Mill
· Dongbu Metal Co., Ltd.
A Global Leader in Ferro-Alloys Industry
· Dongbu Special Steel Co., Ltd.
Korea’s top specialty steel company specializing in high quality products with the leading expertise and technologies in the industry
· Dongbu Farm Hannong Co., Ltd.
Korea’s Largest Innovative Agro-Materials Company
· Dongbu Farm Ceres Co., Ltd.
Global Top Three in the Natural Enemy Insects Industry
· Dongbu Farm Hungnong Co., Ltd.
The Leading Company in Korea’s Seed Industry
· Dongbu Farm Co., Ltd.
Korea’s Best Agro-products Distribution Company
· Dongbu Farm Biotec Co., Ltd.
Experts in Animal Healthcare Products and Household Insecticides
· Dongbu Farm Fresh Produce Co., Ltd.
Large Agro-products Wholesales Company
· Dongbu Farm Gaya Co., Ltd.
Experts in Premium Foods
Based on accumulated expertise and specialization in the semiconductor sector, the affiliates below are developing into sophisticated general electronics companies spanning home appliances, robots, Light Emitting Diodes (LED), high-tech electronic materials, and information technologies. · Dongbu Daewoo Electronics Corporation
The World’s Leading Consumer Electronics Company
· Dongbu Lightec Co., Ltd.
Korea’s Top Manufacturer of LED Lighting
· Dongbu LED Co., Ltd.
· Dongbu HiTek Co., Ltd.
Home to the World’s No.1 Specialty Foundry and Korea’s No.1 System IC Foundry
Korea’s Leading Manufacturer of LED Products
· Dongbu Robot Co., Ltd.
· Dongbu CNI Co., Ltd.
A Company of Total IT Services
Korea’s Top Manufacturer and Designer of Robots
· Dongbu Electronic Materials Co., Ltd.
A Global Leader of Magnetic Powder Technology
Construction · Energy · Real Estate Development
Creating a steadily growing corporate model by making engineering technologies more sophisticated and operating businesses in the fields of special plants, power generation and energy, environment, futuristic housing, general real estate development, and facilities management, etc.
Logistics · Passenger Transport · Contents
Emerging as leading businesses specializing in global general logistics, tourism and passenger services, and expanding cultural content.
Insurance · Securities · Banking
Developing into a global general financial group based on sophisticated financing techniques, global networking, integrated finance, and expanding businesses.
Corporate Social Responsibility
2
· Dongbu Steel Co., Ltd.
· Dongbu Corporation
A Global Company with A Half-Century of Construction Experience
· Dongbu Power Corporation
The First and largest Private Coal-fired Power Generation Company in Korea
· Dongbu Engineering Co., Ltd.
Korea’s Top Global Engineering and Consulting Company
· Dongbu World Co., Ltd.
Operator of World Best Private Golf Club
· Dongbu Express Co., Ltd.
Korea’s Leading Total Logistics Company
· Dongbu Passenger Services Co., Ltd.
A Provider of Safe, Reliable and Comfortable Passenger Transportation
· Dongbu Parcel Services Co., Ltd.
Fast and Secure Global Parcel Services Company
· Dongbu Inc.
An Experienced Brand Consulting, Advertising and Design Company
· Dongbu Insurance Co., Ltd.
Korea’s Leading Total Indemnity Insurance Company
· Dongbu Asset Management Co., Ltd.
A Leading Asset Management Firm
· Dongbu Life Insurance Co., Ltd
Korea’s Leading Life Insurance Company
· Dongbu Savings Bank Co., Ltd.
Korea’s Leading Total Financial Services Savings Bank
· Dongbu Securities Co., Ltd.
A Leader of Total Finance and Investment Banking
· Dongbu Capital Co., Ltd.
A Leading Credit Finance Company
Enhancing scholarships and academic support, and expanding social contribution activities into Asian and African regions, etc. · Dongbu Cultural Foundation
Korea’s Leading Supporter of Scholarships, Fellowships and Institutional Research Grants
· Dong-gok Social Philanthropic Foundation
The Largest Social Philanthropic Foundation in Gangwon Province
· Dongbu Promy Professional Korea’s Prominent Professional Basketball Team Basketball Team
3
PLANT
future
First-class specialty steel products made with our pride in quality We seek to impress customers rather than simply satisfy their needs by strictly managing quality and meeting delivery times, as well as by maintaining excellent quality.
Pohang Works Pohang Works is the only plant in Korea to have three types of annealing furnaces and boasts the Korea’s largest-diameter wire drawing machine and CDM. This enables us to produce top quality products in various sizes.
142,000 m2
400,000 tons per year
Area
Production capacity
CHQ Wire, CD Bar, QT Bar , Peeled Bar Products
4
Facilities
innovation We make annealed products of the highest quality with an array of annealing furnaces and leading technologies. Dongbu Special Steel is the only company in Korea with three types of annealing furnaces (Hydrogen Bell-type, Continuous type, and STC type), which allows it to supply tailored products to its customers.
9
STC Annealing Furnace
Hydrogen Bell-type Annealing Furnace
6
Continuous Annealing Furnace
Facilities
high-techer Unsparing facilities investment is the source of our pride in our products Dongbu Special Steel has the latest facilities to improve product quality and supply capacity, including the largest-diameter wire drawing machine and CDM in Korea, Automatic Pickling Line, Draw Bench, QT Line, and Peeling Machine. This enables us to effectively serve the demands of our customers.
peeling machine
Wire Shaving machine
the largest-diameter wire drawing machine
8
qt line
Automatic Pickling Line
Technology
perfection
Outstanding products are the result of thorough quality management. Dongbu Special Steel is committed to providing its customers with excellent quality products through various and strict quality inspections.
Scanning Electron Microscope
Friction Tester
Universal Testing Machine
10
Hardness Tester
Magnetic Particle Tester
ECT(Eddy Current Tester)
heavy industry Market share of our products:10%
Electronic Appliances Market share of our products:10%
Automobile
Market share of our products:70%
Construction
Market share of our products:10%
pride in diversity
ENGINE / Cold Forged part / ELECTRONIC PART
Dongbu Special Steel produces materials for fasteners of various module equipment and other main parts that are used in automobiles
CHQ WIRE
ENGINE
CD BAR
Cylinder Head Bolt
Engine Bolt
Connecting Rod Bolt
Cam shaft
SCM435
SCM435
SCM435
S45C
Spark Plug
Piston Pin
Eye Bolt
POSCH6ASP
SCM415H
SWCH45K
Automobile Cold Forged part Peeled Bar
Bolt
14
Nut
ELECTRONIC PART CD BAR
CD BAR
Shaft
Differential gear
Spider
motor shaft
SCM415H, 420H
SCr420HB
SUM43, S45C
15
STEERING SYSTEM / Transmission / DRIVING SYSTEM / Brake System / Suspension System
CHQ Wire products made by Dongbu Special Steel show excellent forgeability, and Bar products are superior in surface roughness, dimensional precision, straightness, and roundness, etc.
Brake System CD BAR
CHQ wire
STEERING SYSTEM
Guide Rod
Output Rod
Tie Bar
Input Rod
Master Cylinder Pin
SWCH45FCr
SWCH10A
SWCH45K
SWCH45K
SUM24L
Piston Blank
Hub Bolt
Adjusting Screws
SWCH10A
SCM435
SWCH22A
CD BAR
CHQ WIRE
Tie Rod
Ball Housing
Rack Bar
Input Shaft
SWCH45K
SWCH18A, 25K
S45C, SWCH45FCr
SUM43
Electronic Parking Brake SCM435
Suspension System CD BAR
Ball Stud
Yoke
Shafts
SCM435
S35C, S45C
SWCH25K, 45K, S45C
Coil Spring
Intermidiate Shaft
AISI 9254
SWCH25K
Shock Absorber Shaft S35C, S45C
CD BAR
16
Transmission
DRIVING SYSTEM
CD BAR
CD BAR
application
Transmission Shaft
Drive Shaft
SUM22, 24L
AISI 10B38 (POSA1038B)
Stabilizer Bar SUP9, S48C
CHQ wire
U Bolt
Plug Bolt
Nut
SWCH45K, SCM435
SWCH10A
SWCH25K, 45K
Ball Bearing, Taper Bearing SUJ2
17
HEAVY EQUIPMENT
In addition, Dongbu Special Steel’s quality products are used in bolts, nuts, and screws for fasteners of industrial use machines, shafts, hydraulic cylinders and flanges.
industrial machine CD Bar
Flange S20C
excavator Peeled Bar
Hydraulic Cylinder S45C
heavy industry application Shaft
18
Miniature Bearing
CD BAR
Peeled Bar
hydraulic cylinder Hydraulic Cylinder
Linear Motion Shaft
Miniature Bearing
S45C
SUJ2
SUJ2
19
construction
Electronic Appliances
application
application CHQ Wire
QT Bar
CHQ Wire
CD Bar
CD BAR
Bolt, Nut, Washer
Wrench Bolt
high Tension Stud Bolt
Micro Pile
Screw
Nut
Bushing
Hex Washer Bolt
OA Shaft
AISI 51B20, SWCH45K
SCM435
AISI 4140
S45C
SCM435, SWCH10A, 18A, 22A
SWCH25K
SWCH10A
SWCH45K
SUM22, 23, 24L
PRODUCTS
pride in product
CHQ Wire CD Bar (coil bar) CD Bar (bar bar) QT Bar Peeled Bar 23
Hydrogen Bell-type Annealing Furnace
Manufacturing process
Wire rod
Pickling
Wire drawing
Continuous Annealing Furnace
Pickling & Coating
Inspection
Annealing
Skin pass
Inspection
Coil packing
STC Annealing Furnace
Automatic Pickling Line
Representative process
Wire Drawing Machine
Steel grades Bolt
HD
W/R-PC-SKP-CP
S)AIP
W/R-PC-SA-PC-SKP-CP
SAIP
W/R-PC-WD-SA-PC-SKP-CP
PASAIP
W/R-LA-PC-WD-SA-PC-SKP-CP
PSASAIP
W/R-PC-SA-PC-WD-SA-PC-SKP-CP
Material
Process
Applications
Material
Process
Ball Bearing
SUJ2
PASAIP
Bolt & Screw
SNCM240
PASAIP
SWCH6A-10A
HD
SWCH12A-45K
SAIP, PSASAIP
SCr415-420
PASAIP
SCM415-420
PASAIP
SCr435-440
PASAIP
SCM435-440
PASAIP, PSASAIP
SCM415-420
PASAIP
SCr415-440
PASAIP
SCM435-440
PASAIP
Screw
SWCH6A-22A
SAIP, S)AIP
SCr415-420
PASAIP
Rivet
SWCH6A
HD, SAIP
SCM415-420
PASAIP
Bolt, Nut
Cold Heading Quality Wire
CHQ Wire (Cold Heading Quality Wire) is a material for making fasteners such as bolts, nuts, and screws at room temperature. Dongbu Special Steel makes products with high cold workability with exceptional annealing and coating quality by using advanced facilities including the Hydrogen Bell-type Annealing Furnace, Continuous Annealing Furnace, STC Annealing Furnace, and Automatic Pickling Line.
Available sizes
Wire Rod Pickling & Coating Wire Drawing Skin Pass Low Temperature Annealing Regular Annealing Spheroidized Annealing Coil Packing
Applications
Nut
chq wire
W/R PC WD SKP LA RA SA CP
2~55mm 0.0787~2.1654inch Annealed Wire
Ball stud
piston Pin
2~52mm 0.0787~2.0472inch
100~2,500kg 220~5,512lbs
Drawn wire
Coil weight 25
Quality assurance
Diameter tolerance
(Unit: mm)
Process
Wire diameter
Tolerance
Ovality
LA RA, SA
under 10 10~16 above 16
±0.4 ±0.4 ±0.5
below 0.4 below 0.5 below 0.6
S)AIP, SAIP PASAIP PSASAIP
under 10 10~16 above 16
0, -0.03 0, -0.04 0, -0.05
below 0.01 below 0.015 below 0.025
SAF PASAF
under 10 10~16 above 16
±0.03 ±0.04 ±0.05
below 0.03 below 0.04 below 0.05
under 10 10~16 above 16
0, -0.08 0, -0.09 0, -0.10
below 0.02 below 0.025 below 0.03
Sectional configuration Hexagonal
Surface defect
(Unit: mm)
Packaging specifications
Spheroidized ratio
Tolerance
Process
Spheroidized ratio
RA, SA
under 0.07
SA, S)AIP
70±10
SAF, PASAF
under 0.05
SAF, SAIP PASAF, PASAIP
above 80
PSASAIP
above 90
PASAIP, PSASAIP
under 0.05
Decarburized depth
Coil inner diameter
Coil outer diameter
inch
kg
lbs
mm
inch
mm
inch
1.6~3.8
0.0630~0.1496
100~650
220~1,433
380
14.9606
700
27.5591
3.8~7
0.1496~0.2756
330~1,000
727~2,205
600
23.6220
1,000
39.3701
7~11 11~16 16~
0.2756~0.4331 0.4331~0.6299 0.6299~
330~2,500
727~5,512
800 900 1,000
31.4961 35.4331 39.3701
1,200 1,400 1,600
47.2441 55.1181 62.9921
Single (double) layer packaging
Single (double) layer packaging - corrugated cardboard
pallet
Carrier
Alloy steel
Process
Wire diameter
DM-F
DM-T
DM-F
DM-T
RA, SA
under 10 over 10
0.04 0.05
0.15 0.20
0.04 0.05
0.15 0.20
SAF PASAF
under 8 8~14 14~20 above 20
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
under 8 8~14 14~20 above 20
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
Specialized products
Product
2
Feature This is a product which guarantees defect-free surface quality by shaving the wire surface at a certain depth with the wire shaving machine and thoroughly eliminating surface defects (crack, decarbonization, seam, and pit). This product is used in airplane parts, automotive engines, springs, and heat resistant steel, which require superior surface quality.
Defect Free Wire
Mechanical properties Reduction ratio
Production standard Product diameter: 5.0 ~ 12.5mm
Material
Process
T/S (kg/mm )
SWCH45K
SA R)AIP S)AIP SAF SAIP PSASAIP
under 60 under 72 under 68 under 58 under 62 under 56
Based on 12%
Diameter tolerance: ± 0.05mm Ovality: 50% of diameter tolerance Surface defect: Zero defect
SCM435
SA S)AIP PASAF PASAIP PSASAIP
under 62 under 75 under 60 under 63 under 59
Based on 12%
This is a special CHQ Wire product with a zero-surface-defect guarantee employing eddy current-based non-destructive inspection by using Coil ECT, quality inspection equipment. It is used in products required strict surface quality such as ball bearings and needle bearings.
SA S)AIP PASAF PASAIP PSASAIP
under 63 under 75 under 62 under 65 under 61
Based on 12%
SCM440
26
Unit weight
mm
(Unit: mm)
Carbon steel
SAIP PASAIP
Product diameter
(Unit: %)
Process
S)AIP, SAIP
Packaging standards
Quality assurance
Inspection equipment Coil ECT
Production standard Product diameter: 2.0 ~ 6.0mm Quality assurance Surface defect : 0.05mm or less in depth
27
Descaler
Manufacturing process
CDM Wire rod
Preliminary straightening
Descaling
Straightening
Cold drawing
Inspection
Bar packing
Cold drawing
Cutting Straightening
Precise straightening 2Roll
Representative process
4Roll
CD
W/R-CD-BP
RCD
W/R-RA-CD-BP
SCD
W/R-PC-SA-CD-BP
SWSPCD
W/R-PC-SA-PC-WD-SA-PC-CD-BP
LWSCD
W/R-LA-PC-WD-SA-CD-BP
Wire Rod Cold Drawing Pickling & Coating Wire Drawing Low Temperature Annealing Regular Annealing Spheroidized Annealing Bar Packing
W/R CD PC WD LA RA SA BP
cdm Steel grades
Grade
Carbon Steel
shaft
Alloy Steel
JIS
AISI
DIN
Applications
S10C, S20C, S35C, S45C, S48C, S55C
1006, 1008, 1010,
CK10, CK22, CK35,
1018, 1020,
CK45, CK55, CK60
Motor Shaft, Worm Shaft, Shock Absorber Shaft, Drive Shaft, Head Rest, Steering Column Shaft
1045, 1060 SCr415, SCr420,
5115, 5120, 5140,
15Cr3, 20Cr4, 41Cr4,
Drive Shaft,
SCr440, SMn443,
1541, 4115, 4120,
25CrMo4, 34CrMo4,
Rocker Arm Shaft,
SCM415, SCM420,
4135, 4140, 8620,
42CrM04, 21NiCrMo2,
Piston Pin,
SCM435, SCM440,
4320, 8740, 4340
36CrNiMo4,
Cross Pinion Shaft,
41CrA1Mo7
Automotive Cold Forged Parts
SNCM220, SNCM420,
Cold Drawn Bar
Cd bar
(coil bar)
CD Bar (Cold Drawn Bar) outperforms HR (Hot Rolled) Bar in surface roughness, dimensional precision, straightness and roundness, and is extensively used in parts for automobiles, industrial machines, and home appliances. In order to provide high quality products, we operate 2 Roll and 4 Roll Straighteners, Spinner, Chamfering Machine, and ECT, and supply CTL Bar cut to the length required by customers.
SNCM439, SACM645
Bearing Steel Spring Steel
Free Cutting Steel
Stainless Steel
SUJ2
52100
100Cr6
Bearing, Linear Motion Shaft
SUP9, SUP12,
5155, 9254,
55Cr3, 55SiCr6,
SUP12V
9254V
55SiCr6V
Automotive Coil Spring, Stabilizer
SUM22, SUM23,
1213, 1215,
11SMn30, 46S20,
SUM43, SUM24L
1144, 12L14
11SMnPb30
OA Shaft, Master Cylinder Parts (Bleed Screw, End Plug)
SUS303, SUS304,
303, 304, 316,
X10CrNiS 189,
CNC Machine,
SUS316, SUS410,
410, 430, 440
X5CrNiMo17122,
OA Shaft,
X12CrMoS17,
Industrial machinery
SUS430, SUS440
X5CrNi1810 â ‚ We also offer other steel grades not listed above.
29
Available sizes
Sectional configuration
Packaging standard
Diameter
Sectional configuration
mm
inch
round
4~58
0.1575~2.2835
hexagonal
5~46
0.1969~1.8110
square
8~32
0.3150~1.2598
Special Sections
Wooden case
Wooden case (for CTL)
pp cloth + wooden slat
pp cloth
Special Sections available upon request
Length Diameter
Product
long Bar CTL Bar
Length
mm
inch
mm
ft
4~12
0.1575~0.4724
2,500~4,000
8.2~13.1
12~58
0.4724~2.2835
2,500~7,000
8.2~23.0
10~40
0.3937~1.5748
100~1,300
0.3~4.3
Specialized products
Product
Feature
free cutting steel
Free Cutting Steel refers to products with improved machinability for turning operations. We supply not only lead-added and sulphur-added Free Cutting Steel but also Pb-free Free Cutting Steel to meet the regulation of lead(Pb) content. Free Cutting Steel is used in OA shafts, home appliances, and braking systems, etc.
⁂ CTL Bar : Cut To Length Bar
Quality assurance
Diameter tolerance
(Unit: mm)
ISO Tolerance
IT8 (h8)
Diameter
IT9 (h9)
IT10 (h10) cg Bar
over 3 to 6
0, -0.018
0, -0.030
0, -0.048
over 6 to 10
0, -0.022
0, -0.036
0, -0.058
over 10 to 18
0, -0.027
0, -0.043
0, -0.070
over 18 to 30
0, -0.033
0, -0.052
0, -0.084
over 30 to 50
0, -0.039
0, -0.062
0, -0.100
over 50 to 80
0, -0.046
0, -0.074
0, -0.120
0.5
Straightness 30
mm/m
STS Bar (Stainless Steel Bar)
normalized bar
⁂ Round - IT9, Hexagonal - IT10, Special sections available upon request
Under
(Centerless Ground Bar)
0, +40mm
±0.3mm
Length tolerance:Long Bar
Length tolerance:CTL Bar
Inspection equipment ECT
This product has better dimensional precision such as diameter tolerance than CD Bar, guarantees IT7 (h7), and is used in hydraulic parts, etc. required precise diameter tolerance.
This is used for shafts, bolts, and nuts, which require excellent corrosion resistance and attractive surfaces. We supply Ni-Cr-based 300 series and Cr-based 400 series.
Normalizing is a type of heat treatment to obtain even structure and properties. It ensures both even properties following quenching and tempering and high-quality products by minimizing deformation due to heat treatment. This product is mainly used in automotive steering system parts , etc. This is a special CD Bar with a surface defect guarantee of 0.1mm or less in depth, employing eddy current-based non-destructive inspection by using quality inspection equipment ECT. It is used in products that require superior surface quality including Rack Bar, Piston Rod for shock absorbers, and materials for hydraulic parts.
31
The whole view
Steel grades
Grade
Carbon Steel
JIS
AISI
DIN
Applications
S10C, S20C, S35C,
1006, 1008, 1010,
CK10, CK22, CK35,
S45C, S48C, S55C
1018, 1020,
CK45, CK55, CK60
Automotive and Heavy machinery shafts,
1045, 1060
Cold drawing Alloy Steel
Drive Shaft
SCr415, SCr420,
5115, 5120, 5140,
15Cr3, 20Cr4, 41Cr4,
Drive Shaft, Piston Pin,
SCr440, SMn443,
1541, 4115, 4120,
25CrMo4, 34CrMo4,
Heavy machinery shafts
SCM415, SCM420,
4135, 4140, 8620,
42CrM04, 21NiCrMo2,
SCM435, SCM440,
4320, 8740, 4340
36CrNiMo4, 41CrA1Mo7
SNCM220, SNCM420, SNCM439, SACM645
2Roll
Bearing Steel
SUJ2
52100
100Cr6
Bearing, Linear Motion Shaft
Free Cutting Steel
SUM22, SUM23,
1213, 1215,
11SMn30, 46S20,
SUM43, SUM24L
1144, 12L14
11SMnPb30
Automotive and Heavy machinery shafts
SUS303, SUS304,
303, 304, 316,
X10CrNiS 189,
SUS316, SUS410,
410, 430, 440
X5CrNi1810,
Stainless Steel
Draw Bench
Industrial machinery and Heavy machinery shafts
X5CrNiMo17122,
SUS430, SUS440
X12CrMoS17 ⁂ We also offer other steel grades not listed above.
Available sizes
Quality assurance MICRO PILE
Flange
mm
Cd bar
(bar bar)
Bar-to-Bar type CD Bar is a large-diameter cold drawn bar product with improved straightness and surface roughness produced by descaling the surface of HR Bar with the Shot Blaster and drawing it with the Draw Bench. Bar-to-Bar type CD Bar can be produced at a maximum of 100mm and is used in automobiles, heavy equipment, and construction and industrial machines.
inch
m
ft
round
20~100 0.7874~3.9370
3~8 9.8~26.2
hexagonal
20~65 0.7874~2.5591
3~8 9.8~26.2
square
20~43 0.7874~1.6929
3~8 9.8~26.2
Special Sections
Special sections available upon request
Diameter tolerance
(Unit: mm)
ISO Tolerance
IT8 (h8)
IT9 (h9)
IT10 (h10)
over 18 to 30
0, -0.033
0, -0.052
0, -0.084
over 30 to 50
0, -0.039
0, -0.062
0, -0.100
over 50 to 80
0, -0.046
0, -0.074
0, -0.120
over 80 to 120
0, -0.054
0, -0.087
0, -0.140
Diameter
Cold Drawn Bar
Length
Diameter
Sectional configuration
⁂ Round - IT9, Hexagonal - IT10, Special sections available upon request
Under
0.5
Straightness
mm/m
0, +40mm Length tolerance 33
The whole view
Steel grades
Grade
Carbon Steel
JIS
AISI
DIN
Applications
S10C, S20C, S35C,
1006, 1008, 1010,
CK10, CK22, CK35,
S45C, S48C, S55C
1018, 1020,
CK45, CK55, CK60
Automotive and Heavy machinery shafts
1045, 1060
Quenching and Tempering
Alloy Steel
SCr415, SCr420,
5115, 5120, 5140,
15Cr3, 20Cr4, 41Cr4,
SCr440, SMn443,
1541, 4115, 4120,
25CrMo4, 34CrMo4,
SCM415, SCM420,
4135, 4140, 8620,
42CrM04, 21NiCrMo2,
SCM435, SCM440,
4320, 8740, 4340
36CrNiMo4, 41CrA1Mo7
Bolts (Stud Bolts) for Marine Plants, Automotive and Heavy machinery shafts
SNCM220, SNCM420, SNCM439, SACM645
â ‚ We also offer other steel grades not listed above.
Buffing Machine
QT Line
Available sizes
mm
inch
m
8~40 0.3150~1.5748
round
Quality assurance
Length
Diameter
Sectional configuration
ft
3~7 9.8~23.0
Diameter tolerance
(Unit: mm)
ISO Tolerance
IT9 (h9)
Diameter over 6 to 10
0, -0.036
over 10 to 18
0, -0.043
over 18 to 30
0, -0.052
over 30 to 50
0, -0.062
Note
high tension stud bolt
Quenched & Tempered Bar
qt bar
QT Bar provides strength and high tensile quality by quenching and tempering CD Bar or HR Bar and is used in plant-fastening bolts and automotives. We can guarantee customer-demanded quality by improving the straightness with the 2 Roll Straightener and are supplying tailored Bright QT Bar by raising surface glossiness and removing scale with our Buffing Machine.
Hardness deviation Product
Hardness deviation
QT Bar
less HRC 3 point
Under
0.5
Straightness
mm/m
Note
0, +40mm Length tolerance 35
The whole view
Steel grades
Grade
JIS
AISI
DIN
Applications
S10C, S20C, S35C, S45C, S48C, S55C
1006, 1008, 1010,
CK10, CK22, CK35,
Carbon Steel
1018, 1020,
CK45, CK55, CK60
Automotive and Heavy machinery shafts,
1045, 1060
Peeling
SCr415, SCr420, SCr440, SMn443, SCM415, SCM420, SCM435, SCM440, SNCM220, SNCM420, SNCM439, SACM645
5115, 5120, 5140,
15Cr3, 20Cr4, 41Cr4,
Drive Shaft, Piston Pin,
1541, 4115, 4120,
25CrMo4, 34CrMo4,
Heavy machinery shafts
4135, 4140, 8620,
42CrM04, 21NiCrMo2,
4320, 8740, 4340
36CrNiMo4,
Bearing Steel
SUJ2
52100
100Cr6
Bearing, Linear Motion Shaft
Free Cutting Steel
SUM22, SUM23, SUM43, SUM24L
1213, 1215,
11SMn30, 46S20,
1144, 12L14
11SMnPb30
Automotive and Heavy machinery shafts
SUS303, SUS304, SUS316, SUS410, SUS430, SUS440
303, 304, 316,
X10CrNiS 189,
410, 430, 440
X5CrNi1810,
Alloy Steel
PEELING MACHINE
Drive Shaft
Stainless Steel
41CrA1Mo7
Industrial machinery and Heavy machinery shafts
X5CrNiMo17122, X12CrMoS17
â ‚ We also offer other steel grades not listed above.
Available sizes
mm
Cold Forged part
peeled bar Peeled Bar is a surface-defect-free high quality product made by processing the surface of HR Bar or QT Bar with continuous turning operations. It is widely used in different industries, such as for automotive cold forged parts and hydraulic cylinders of heavy equipment, etc., which require superior surface quality. Peeled Bar supplied by Dongbu Special Steel boasts outstanding roundness and surface roughness, since it is produced by the Peeling Machine made in an integrated frame structure.
m
ft
3~7 9.8~23.0
Diameter tolerance
(Unit: mm)
ISO Tolerance
IT8 (h8)
IT9 (h9)
over 18 to 30
0, -0.033
0, -0.052
over 30 to 50
0, -0.039
0, -0.062
over 50 to 80
0, -0.046
0, -0.074
over 80 to 120
0, -0.054
0, -0.087
over 120 to 180
0, -0.063
0, -0.100
Diameter
cylinder
inch
20~130 0.7874~5.1181
round
Quality assurance
Length
Diameter
Sectional configuration
Note
Surface defect Product
Surface defect
Peeled Bar
Zero Defect
Under
0.5
Straightness
mm/m
Note
0, +40mm Length tolerance 37
information
Head Office 4F, 432, Teheran-ro, Gangnam-gu, Seoul, 135-523, Korea +82-2-3450-8257
Pohang Works 151, Daesong-ro, Nam-gu, Pohang-si, Gyeongsangbuk-do, 790-300, Korea +82-54-289-3550
Gyoungin Center 200, Hyeomnyeok-ro, Siheung-si, Gyeonggi-do, 429-450, Korea +82-31-496-6767
Daejeon Office 504-ho, 95, Dunsan-daero 117beon-gil, Seo-gu, Daejeon, 302-834, Korea +82-42-472-6026
Daegu Office 704-ho, 217, Seongseogongdan-ro,Dalseo-gu, Daegu, 704-901 Korea +82-53-384-5060
Busan Office 8F, 322, Hasinjungang-ro, Saha-gu, Busan, 604-848, Korea +82-51-463-9031
The information contained here is meant to provide information about our products. Please confirm details with us before placing an order, as some of the information does not mean quality is guaranteed. Please note and understand that this information is subject to changes when necessary without prior notice.
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