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Dongil Steel Co., Ltd. does the best to become a world-class steel company
by investing in equipment continuously and manufacturing globally competitive products with the best quality.

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Cold Drawn Round Bar

Hot-rolled steel products, namely, these products are manufactured by cold-drawing using materials such as steel wire, coil bars and hot-rolled bars. The products, after undergoing hot-forgingm as well as cold and warm forging and processes, are used in manufacturing parts in automobiles, machinery and other precision parts.
They are high value-added. We conduct eddy testing adn ultrasonic testing to manufacture precise-measurement and elegant products.

Usage : Auto-Parts, Machine-Parts, Building material, Bolt-Nut, Various Shaffs, PIN Train, Elevator, Bearing Case, and so on

Quality of the material : Carbon Steel, Alloy Steel, Bearing Steel

Oridyct Standards : 6 ~ 80mm

UsageㆍQuality of The MaterialㆍProduct Standard

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Product Grade Size Range
Cold Drawn Steel Round Bar S10C ~ S55C / SCM / SUJ2 6 ~ 80mm

KindㆍMechanical Properties

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Division Tension Strength
(kgf/㎟)		 Hardness
(HRB)		 Remark
Rolled steel for general structure over 45 over 70 SS330, SS400, SS490, SS540
Carbon steel for machine structure ~S25C over 50 over 75 S10C, S12C, S15C, S17C, S20C, S25C
30C~ over 60 over 85 S30C, S35C, S38C, S40C, S45C(S)
Alloy steel Not heat treatment over 58 over 80 SCr415, SCM415, SUM31
Heat treatment over 60 over 85 SCr435, SCM440, AISI4140
Spring steel over 70 over 90 SUP 7, 9, 10, 12, SAE9254, 500CrV4
Bearing steel over 70 over 90 SUJ 1, 2, 3, 4, 5
Stainless steel 304 system over 55 over 85 STS 304M, 304HC, 304CS, 304L, T304
316 system over 55 over 85 STS 316, 316L, T316, T316L
303 system over 65 over 90 STS 303, 303F, 303C, T303, T303F
400 system over 60 over 87 STS 410, 416, 420J2, 420F

Dimension Tolerance

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Diameter(㎜) h7 h8 h9 h10 h11 h12
More than 6.0 below 10.0 0 -0.015 0 -0.022 0 -0.036 0 -0.058 0 -0.090 0 -0.15
More than 10.0 below 18.0 0 -0.018 0 -0.027 0 -0.043 0 -0.070 0 -0.11 0 -0.18
More than 18.0 below 30.0 0 -0.021 0 -0.033 0 -0.052 0 -0.084 0 -0.13 0 -0.21
More than 30.0 below 50.0 0 -0.025 0 -0.039 0 -0.062 0 -0.10 0 -0.16 0 -0.25
More than 50.0 below 80.0 0 -0.030 0 -0.046 0 -0.074 0 -0.12 0 -0.19 0 -0.30

ToleranceㆍDiameter Deviation

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Product Shape Product Standard
(Diameter x Length)		 Dimension Tolerance Grade Application
Diameter(㎜) Length(㎜)
CD BAR Round (R) ~13.0 4,000~6,000 h9
13.0~ 4,000~6,000
Hexagon (Hx) 12.0~60.0 4,000~6,000 h11
Square (Sq) 8.0~60.0 4,000~6,000 h12
Diameter deviation Within diameter tolerance 30%

Chemicals

Standard Name Chemicals and Mechanical Property
Rolled carbon steel for cold - finished steel bars Chemical component
Carbon steel for machine structural use Chemical component
Structural steel with specified hardenabilith bands Chemical component
Chromium steels Chemical component
Chromium molybdenum steels Chemical component
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