Carbon Steel for Machine Structural use

Carbon structural steel is referred to steel contains < 0.38% C, and content of sulfur and phosphorus > 0.035%. Because of its certain level of strength, it is usually made into steel rebars, rods, plates, tubes, architectural parts such as bridge beams and normal parts, too, like screws, nuts and rivets by rolling.

Product Applications

General connection rods, connectors, shafts, crankshafts, screws, automotive parts, machine parts, mechanical parts, such as mechanical tools.

S15C Low Carbon Steel

Low-carbon steel, is referred to steel contains <0.25%C, so

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S15C Low Carbon Steel

Low-carbon steel, is referred to steel contains <0.25%C, so it has lower strength and hardness; therefore, it is called “soft steel.” By and large, it can be divided into “normal carbon structural” and “high-quality” steel; they can all be used as engineering parts without heat-treatment, or some of them are carburized to increase its wear-resistance and become mechanical parts. Because of lower strength and hardness and better plasticity and toughness, low-carbon steel can be performed cold-forming easily : side rolling, folding, punching,…etc. Besides, for steel that contains carbon from 0.10~0.30%, other good features can be found such as: good weldability, easy to forge and machine. Chains, rivets, bolts and shaft are commonly made of it.

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S45C Medium Carbon Steel

Medium-carbon steel, is referred to steel contains 0.25%~0.6

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S45C Medium Carbon Steel

Medium-carbon steel, is referred to steel contains 0.25%~0.6C, so it has good machinability and higher strength and hardness than low-carbon steel but it is worse in weldability. Besides, medium-carbon steel can be directly processed by hot-rolling and cold drawing with or without heat-treatment, due to its lower plasticity and toughness. After quenching and annealing, medium-carbon can reach hardness of HRC55 (HB538) and obtain better general mechanical attributes. Therefore, medium-carbon steel has been applied the most; not only to architectural materials but great variety of mechanical parts.

Application: This steel is the most widely used steel in various industries. It is suitable for general connecting rods, joints, shafts, crankshafts, screws, auto parts, machine parts, machine parts, machine tools, etc.

Heat treatment method:
1. Hardening : uniformly heat to 820~870℃ and harden in water.
2. Tempering: Heat to 550~650℃ and quickly cool down.
3. Hardness: The hardness after treatment is HB 201~269.
4. Tension: 70KG/mm2 or more.
※When the carbon content is reduced by 0.05%, the heat should be increased by 10℃ (ie S40C 830~880℃).

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S20C

Among carbon steels for machine structure, it is a steel mat

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S20C

Among carbon steels for machine structure, it is a steel material equivalent to semi-mild steel. Like SS material, it is used as a material for general structural members, general-purpose frames, and shafts. SS material may be selected depending on the application. The carbon content range is 0.18 to 0.23. The strength of carbon steel is a type of steel that is not very noticeable.

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Steel data

Standard Code Spec No. Material No. Mark
AISI 1006
AISI 1008
AISI 1010
CNS 3828 S15C
JIS G4051 S15C
AISI 1015
SAE G10150 1015
DIN 17210 1.0401 C15
GB 699 15
SAE G10180 1018
CNS 3828 S20C
JIS G4051 S20C
AISI 1020
DIN 17200 1.0402 C20
DIN 17200 1.1151 Ck20
CNS 3828 S35C
JIS G4051 S35C
AISI 1035
DIN 17200 1.0501 C35
DIN 17200 1.1181 Ck35
CNS 3828 S45C
GB 699 45
JIS G4051 S45C
AISI 1045
DIN 17200 1.0503 C45
CNS 3828 S55C
JIS G4051 S55C
AISI 1055
(C)% (Si)% (Mn)% (P)% (S)% (Ni)% (Cr)% (Cu)% Ni+Cr
≦ 0.08 0.25~0.4 ≦ 0.04 ≦ 0.05
≦ 0.1 0.3~0.5 ≦ 0.04 ≦ 0.05
0.08~0.13 0.3~0.6 ≦ 0.04 ≦ 0.05
0.13~0.18 0.15~0.35 0.3~0.6 ≦ 0.03 ≦ 0.035 ≦ 0.2 ≦ 0.2 ≦ 0.3
0.13~0.18 0.15~0.35 0.3~0.6 ≦ 0.03 ≦ 0.035 ≦ 0.2 ≦ 0.2 ≦ 0.3 ≦ 0.35
0.13~0.18 0.15~0.35 0.3~0.6 ≦ 0.04 ≦ 0.05
0.13~0.18 0.3~0.6 ≦ 0.04 ≦ 0.05
0.12~0.18 0.15~0.35 0.3~0.8 ≦ 0.045 ≦ 0.045
0.12~0.18 0.17~0.37 0.35~0.65 ≦ 0.035 ≦ 0.035 ≦ 0.25 ≦ 0.25 ≦ 0.25
0.15~0.2 0.6~0.9 ≦ 0.03 ≦ 0.05
0.18~0.23 0.15~0.35 0.3~0.6 ≦ 0.035 ≦ 0.035 ≦ 0.2 ≦ 0.2 ≦ 0.3 ≦ 0.35
0.18~0.23 0.15~0.35 0.3~0.6 ≦ 0.03 ≦ 0.035 ≦ 0.2 ≦ 0.2 ≦ 0.3 ≦ 0.35
0.18~0.23 0.3~0.6 ≦ 0.04 ≦ 0.05
0.17~0.23 0.15~0.35 0.3~0.6 ≦ 0.045 ≦ 0.045
0.17~0.23 0.15~0.35 0.3~0.6 ≦ 0.035 ≦ 0.035
0.35~0.41 0.15~0.35 0.6~0.9 ≦ 0.03 ≦ 0.035 ≦ 0.2 ≦ 0.2 ≦ 0.3 ≦ 0.35
0.32~0.38 0.15~0.35 0.6~0.9 ≦ 0.03 ≦ 0.035 ≦ 0.2 ≦ 0.2 ≦ 0.3 ≦ 0.35
0.32~0.38 0.6~0.9 ≦ 0.04 ≦ 0.05
0.32~0.39 0.15~0.35 0.5~0.8 ≦ 0.045 ≦ 0.045
0.32~0.38 0.15~0.35 0.5~0.8 ≦ 0.035 ≦ 0.035
0.42~0.48 0.15~0.35 0.6~0.9 ≦ 0.03 ≦ 0.035 ≦ 0.2 ≦ 0.2 ≦ 0.3 ≦ 0.35
0.42~0.5 0.17~0.37 0.5~0.8 ≦ 0.035 ≦ 0.035 ≦ 0.25 ≦ 0.25 ≦ 0.25
0.42~0.48 0.15~0.35 0.6~0.9 ≦ 0.03 ≦ 0.035 ≦ 0.2 ≦ 0.2 ≦ 0.3 ≦ 0.35
0.43~0.5 0.6~0.9 ≦ 0.04 ≦ 0.05
0.42~0.5 0.15~0.35 0.5~0.8 ≦ 0.045 ≦ 0.035
0.52~0.6 0.15~0.35 0.6~0.9 ≦ 0.03 ≦ 0.035 ≦ 0.2 ≦ 0.2 ≦ 0.3 ≦ 0.35
0.52~0.6 0.15~0.35 0.6~0.9 ≦ 0.03 ≦ 0.035 ≦ 0.2 ≦ 0.2 ≦ 0.3 ≦ 0.35
0.5~0.6 0.6~0.9 ≦ 0.04 ≦ 0.05