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   Product Introduction   Production facilities   Production process   Size availability   Steel type quality features   Standard specifications  

 Product Introduction
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The Cold Drawn Steel Bar (CD Bar) is a hot-rolled wire rod that has undergone the cold drawing process, and is sheared to a regular length, with perfect straightness as one of its features.
Compared to the hot rolled drawn steel bars, drawn steel bars feature superb surface roughness, dimensional precision, and straightness. They are used in the production of automotive parts and home electrical appliances. Dongbu Steel offers long bars and CTL (cut to length) products that are sheared to a specified length.

 

Applications

  

 

Automotive
Axle shaft (C/V Joint Shaft)
Shock absorber shaft
Steering column shaft

  

Industrial machines and home electrical appliances
Air-conditioner compressor shaft
Ball bearing, bearing race
Motor shaft etc
Printer and copier shaft

 

 

Applications by steel type

Classification  AISI(SAE)

 AISI(SAE) JIS

Application

Production process symbol

Carbon steel

 1010~1060 CH6A~CH45K
S25C, S35C,
S45C, S50C 		Motor shaft
Axle shaft
S/A shaft
Steering parts		 CD,RCD
SCD,SWSCD

Manganese steel

 1541 SMn443 C/V Joint shaft SCD

Chromium steel

 5115,5120 SCr415
SCr420

Other shaft and parts

 LCD,SCD

Chromium-molybdenum steel

 4115,4135
4140 		SCM415
SCM435
SCM440

Other shaft and parts

 LCD,SCD

High carbon chromium steel

 52100 SUJ2 Bearing
Shaft
Wrench set		 SCD,SWSCD

Free cutting steel

 1213,12L14,
1151 		SUM22,SUM43,
SUM24L

Office automation shaft
Sleeve shaft
Home electrical appliances, control device CD

 CD

 Production facilities
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Combiner
 
Equipment Name Size Equipment producer
CDM 0B 2mm ~ 8mm Schumag/Germany
CDM 1A 4mm ~ 16mm Schumag/Germany
CDM 1B 5mm ~ 16mm Schumag/Germany
CDM 1C 5mm ~ 16mm EJP/Germany
CDM 1D 4mm ~ 12mm EJP/Germany
CDM 2A 6mm ~ 25mm Schumag/Germany
CDM 2B 10mm ~ 30mm Schumag/Germany
CDM 3B 20mm ~ 40mm Schumag/Germany
CDM 4B 30mm ~ 58mm EJP/Germany
 

Post-treatment facility

Equipment Name

 Size

Equipment producer

Circular Saw

Dia.:10~30mm, Length:100~800mm

 Tsune/Japan
Band Saw Dia.:20~30mm, Length:500~1,500mm

Wongong/Korea

Bar Chamfering M/C 6~40mm, Length : 2~6m Mazda/Japan

Off line 2Roll Straightener

 9 ~ 25mm Schumag/Germany
E.C.T 12 ~ 30mm Dr.Forst/Germany

 Production process
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Continuous Drawing
The cold drawing machine produces bar-shaped products that meet the customers' needs in terms of size, straightness and mechanical properties of the product.
The cold drawing machine is chief in the process of 'Mechanical Descaler- Drawing - Cutting - Straightening & Polishing'

 Size availability
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Classification by product specification

Sectional Configuration Size Length
Round 2 ~ 58mm 3 ~ 6m
Hexagonal 5 ~ 52mm 3 ~ 6m
Square 8 ~ 42mm 3 ~ 6m
Irregular Shape Order Accepted on Consulation 3 ~ 6m
 

Classification by size tolerance

 

Grade of tolerance Diameter

 Grade8
(h8)		 Grade9
(h9)		 Grade10
(h10)		 Grade11
(h11)
~ 3 incl. 0, -0.014 0, -0.025 0, -0.040 0, -0.060
3 ~ 6 incl. 0, -0.018 0, -0.030 0, -0.048 0, -0.075
6 ~ 10 incl. 0, -0.022 0, -0.036 0, -0.058 0, -0.090
10 ~ 18 incl. 0, -0.027 0, -0.042 0, -0.070 0, -0.110
18 ~ 30 incl. 0, -0.033 0, -0.052 0, -0.084 0, -0.013
30 ~ 50 incl. 0, -0.039 0, -0.062 0, -0.100 0, -0.160
50 ~ 80 incl. 0, -0.046 >0, -0.074 0, -0.120 0, -0.190
 

 CTL bar
 

A CTL Bar is cut from a CD Bar to the length required by the customer. It has an elegant surface and accuracy in length. Product testing ensures that the product is flawless.

 
 
  Item Spec.

Product

Carbon Steel, Alloy Steel,
Free Cutting Steel, Special Steel

Dia - Min 10.0mm￠ Max 30.0mm￠

Quality

Surface

  Defect free

Dia.

 Dia. Tolerance
Dia.

Grade

Grade8
(h8)

Grade9
(h9)

Grade10
(h10)

Over 6 to 10 incl.

0
-0.022		 0
-0.036		 0
-0.058

Over 10 to 18 incl.

 0
-0.027		 0
-0.043		 0
-0.070

Over 18 to 30 incl.

 0
-0.033		 0
-0.052		 0
-0.084
 

Length

Tolerance : within ± 0.2mm

Packing

 -

Steel box

 Steel type quality features
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Classification by mechanical properties

Symbol Chemical Composition(%) JIS
Kinds of
Steel 		SAE
No 		C Si Mn P S Ni Cr Mo Pb

Carbon steel

 1010 0.08-0.13 0.15-0.35 0.30-0.60 0.030.max 0.035max - - - - S10C
1015 0.13-0.18 0.15-0.35 0.30-0.60 0.030.max 0.035max - - - - S15C
1018 0.15-0.20 0.15-0.35 0.30-0.60 0.030.max 0.035max - - - - S18C
1020 0.18-0.23 0.15-0.35 0.30-0.60 0.030.max 0.035max - - - - S20C
1022 0.20-0.25 0.15-0.35 0.30-0.60 0.030.max 0.035max - - - - S22C
1025 0.22-0.28 0.15-0.35 0.30-0.60 0.030.max 0.035max - - - - S25C
1035 0.32-0.38 0.15-0.35 0.60-0.90 0.030.max 0.035max - - - - S35C
1038 0.35-0.41 0.15-0.35 0.60-0.90 0.030.max 0.035max - - - - S38C
1040 0.37-0.43 0.15-0.35 0.60-0.90 0.030.max 0.035max - - - - S40C
1045 0.42-0.48 0.15-0.35 0.60-0.90 0.030.max 0.035max - - - - S45C
1049 0.45-0.51 0.15-0.35 0.60-0.90 0.030.max 0.035max - - - - S48C
1050 0.48-0.53 0.15-0.35 0.60-0.90 0.030.max 0.035max - - - - S50C
1055 0.52-0.58 0.15-0.35 0.60-0.90 0.030.max 0.035max - - - - S55C
1060 0.55-0.65 0.15-0.35 0.60-0.90 0.030.max 0.035max - - - - S58C

Free cutting steel

 1117 0.14-0.20 0.15-0.35 1.00-
1.30 		0.040.max 0.08-0.13 - - - - SUM31
1144 0.40-0.48 0.15-0.35 1.35-
1.65 		0.040.max 0.24-0.33 - - - - SUM43
1213 0.13max 0.15-0.35 0.70-
1.00 		0.07-0.12 0.24-0.33 - - - - SUM22
12L14 0.15max 0.15-0.35 0.85-
1.15 		0.04-0.09 0.26-0.35 - - - 0.10-0.35 SUM24L
- 0.22-0.28 0.15-0.35 0.30-
0.60 		0.030.max 0.035max - - - 0.10-0.35 S25CL
- 0.42-0.48 0.15-0.35 0.60-
0.90 		0.030.max 0.035max - - - 0.10-0.35 S45CL

Manganese Steel

 - 0.30-0.36 0.15-0.35 1.20-
1.50 		0.030.max 0.030.max - 0.35max - - SMn433
1541 0.40-0.46 0.15-0.35 1.35-
1.65 		0.030.max 0.030.max - 0.35max - - SMn443

Chromium - moly - bdenum steel

 - 0.13-0.18 0.15-0.35 0.60-0.85 0.030.max 0.030.max - 0.90-1.20 0.15-0.30 - SCM415
- 0.18-0.23 0.15-0.35 0.60-0.85 0.030.max 0.030.max - 0.90-1.20 0.15-0.30 - SCM420
4135 0.33-0.38 0.15-0.35 0.60-0.85 0.030.max 0.030.max - 0.90-1.20 0.15-0.30 - SCM435
4137 0.35-0.40 0.15-0.35 0.70-
0.90 		0.030.max 0.030.max - 0.90-1.20 0.15-0.30 - -
4140 0.38-0.43 0.15-0.35 0.60-0.85 0.030.max 0.030.max - 0.90-1.20 0.15-0.30 - SCM440

Chrome Steel

 5115 0.13-0.18 0.15-0.35 0.60-0.85 0.030.max 0.030.max - 0.90-1.20 - - SCr415
5120 0.18-0.23 0.15-0.35 0.60-0.85 0.030.max 0.030.max - 0.90-1.20 - - SCr420
5130 0.28-0.33 0.15-0.35 0.60-0.85 0.030.max 0.030.max - 0.90-1.20 - - SCr430
5135 0.33-0.38 0.15-0.35 0.60-0.85 0.030.max 0.030.max - 0.90-1.20 - - SCr435
5140 0.38-0.43 0.15-0.35 0.60-0.85 0.030.max 0.030.max - 0.90-1.20 - - SCr440
Stainess
Steel		 - 0.15max 1.00
max 		2.00max 0.20max 0.15max 8.00-10.00 17.00-19.00 0.60
max 		- SUS303
- 0.08max 1.00
max 		2.00max 0.0045max 0.030max 8.00-10.50 08.00-20.00 - - SUS304

High Carbon Bearing Steel

 52100 0.95-1.10 0.15-0.35 0.50max 0.025max 0.025max - 1.30-1.60 - - SUJ 2

 Standard specifications
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Packing and color of product tag

Type

Package

Tape

Product tag

Free cutting steel

White

Green

Green

commercial steel

White

White

White

carbon steel

White

Yellow

Yellow

Alloy steel

White

Blue

Blue


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