Free Cutting Steel

Free Cutting Steel, Free Cutting Alloy Elements such as Pb, S, P are often used as additives, especially S (sulfur), which is added to steel to form MnS, to acquire attributes that can benefit the machining with better lubrication, forming shorter and intermittent chips and improved surface roughness. Therefore, those steel with those elements added are called Free Cutting Steel. Besides, by adding 0.1~0.3% Pb, the machinability can be enhanced since Pb does not get resolved in iron; instead, it exists as mono-particle spreading over equally to serve as solid lubrication but does not affect the mechanical property. There are 2 types Free Cutting Steel categorized by added elements : (1) S-series (2) Pb-series. Both 2 types are not applicable in the field of forming under forging, cold-working and soldering.

SUM11,22,22L
It is a type that emphasizes machinability and is also called low-carbon free-cutting steel. This steel is selected when machinability is more important than mechanical properties (strength, etc.).

SUM31,32,41,42,43,31L
It has a medium amount of carbon and is strong, and is also called medium carbon free-cutting steel. SUM31 has the strength equivalent to SS400, and SUM41, 42, 43 have the strength equivalent to S35C, S40C, S45C. It is used after heat treatment (tempering). The ratio of Mn (manganese) is increased to prevent strength deterioration due to S (sulfur).

Composite free-cutting steel (also called S free-cutting steel) is said to have a direction in its mechanical properties. It is said that the higher the S (sulfur) content, the less ductile and toughness it has in the direction perpendicular to rolling. It is said that Pb free-cutting steel to which Pb, which is a free-cutting element, is added has excellent malleability and does not have anisotropy like S free-cutting steel because elemental elements are uniformly distributed. .. However, since the mechanical properties of this product depend on the melting point of Pb, the mechanical properties deteriorate at temperatures higher than 327 ° C. Generally, Pb free-cutting steel is used after heat treatment such as quenching and tempering.

Transition of material symbols for sulfur and sulfur composite free-cutting steel (SUM):
JIS old and new comparison table

Product Applications

Product Applications For fields such as : machine parts, high-precision parts of apparatus, bolts, shafts, pins and other parts of high precision.

SCM435S

Red-cross alloy (S) SCM435S is a high-strength alloy steel

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SCM435S

Red-cross alloy (S)
SCM435S is a high-strength alloy steel commonly used for manufacturing high-strength components such as bearings, bolts, and mechanical parts. It exhibits excellent strength, hardness, and wear resistance, along with good heat treatability, further enhancing its mechanical properties through quenching and tempering. SCM435S contains alloying elements like molybdenum to increase its strength and wear resistance. Due to its excellent performance, SCM435S finds wide applications in various industrial applications with high loads and pressures.

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SCM435L

Red-cross alloy (Pb) SCM435L is a low-alloy steel commonly

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SCM435L

Red-cross alloy (Pb)
SCM435L is a low-alloy steel commonly used for manufacturing high-strength components such as bolts, nuts, bearings, etc. It possesses excellent strength and hardness, along with good machinability and heat treatability, further enhancing its mechanical properties through quenching and tempering. SCM435L typically contains alloying elements like molybdenum to increase its strength and wear resistance. Due to its excellent performance, SCM435L finds wide applications in automotive, machinery, and structural engineering fields.

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SCM435L

Red-cross alloy (Pb) SCM435L is a low-alloy steel commonly

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SCM435L

Red-cross alloy (Pb)
SCM435L is a low-alloy steel commonly used for manufacturing high-strength components such as bolts, nuts, bearings, etc. It possesses excellent strength and hardness, along with good machinability and heat treatability, further enhancing its mechanical properties through quenching and tempering. SCM435L typically contains alloying elements like molybdenum to increase its strength and wear resistance. Due to its excellent performance, SCM435L finds wide applications in automotive, machinery, and structural engineering fields.

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SCM435L

Red-cross alloy (Pb) SCM435L is a low-alloy steel commonly

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SCM435L

Red-cross alloy (Pb)
SCM435L is a low-alloy steel commonly used for manufacturing high-strength components such as bolts, nuts, bearings, etc. It possesses excellent strength and hardness, along with good machinability and heat treatability, further enhancing its mechanical properties through quenching and tempering. SCM435L typically contains alloying elements like molybdenum to increase its strength and wear resistance. Due to its excellent performance, SCM435L finds wide applications in automotive, machinery, and structural engineering fields.

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SCM415L

Green-cross alloy (Pb) SCM415L is a low-alloy steel known f

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SCM415L

Green-cross alloy (Pb)
SCM415L is a low-alloy steel known for its good weldability and machinability. It is commonly used in the manufacturing of mechanical components, bearings, gears, etc. SCM415L may contain elements like chromium, nickel, etc., in its chemical composition to enhance its strength and hardness. Additionally, heat treatment is often performed to further improve its mechanical properties. Due to its excellent machinability and weldability, SCM415L finds wide applications across various industrial sectors such as automotive, machinery manufacturing, etc.

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SCM415L

Green-cross alloy (Pb) SCM415L is a low-alloy steel known f

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SCM415L

Green-cross alloy (Pb)
SCM415L is a low-alloy steel known for its good weldability and machinability. It is commonly used in the manufacturing of mechanical components, bearings, gears, etc. SCM415L may contain elements like chromium, nickel, etc., in its chemical composition to enhance its strength and hardness. Additionally, heat treatment is often performed to further improve its mechanical properties. Due to its excellent machinability and weldability, SCM415L finds wide applications across various industrial sectors such as automotive, machinery manufacturing, etc.

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SCM415L

Green-cross alloy (Pb) SCM415L is a low-alloy steel known f

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SCM415L

Green-cross alloy (Pb)
SCM415L is a low-alloy steel known for its good weldability and machinability. It is commonly used in the manufacturing of mechanical components, bearings, gears, etc. SCM415L may contain elements like chromium, nickel, etc., in its chemical composition to enhance its strength and hardness. Additionally, heat treatment is often performed to further improve its mechanical properties. Due to its excellent machinability and weldability, SCM415L finds wide applications across various industrial sectors such as automotive, machinery manufacturing, etc.

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SCM415S

Green-cross alloy (S) SCM415S is a high-strength alloy stee

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SCM415S

Green-cross alloy (S)
SCM415S is a high-strength alloy steel commonly used in the manufacturing of high-strength components and structures such as bearings, bolts, nuts, etc. It exhibits excellent wear resistance and heat treatability, allowing for further enhancement of strength and hardness through quenching and tempering. Its chemical composition includes alloying elements like nickel, molybdenum, etc., to increase strength and wear resistance. SCM415S is typically employed in high-load, high-temperature, and high-pressure environments, such as automotive parts and mechanical components.

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SCM415S

Green-cross alloy (S) SCM415S is a high-strength alloy stee

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SCM415S

Green-cross alloy (S)
SCM415S is a high-strength alloy steel commonly used in the manufacturing of high-strength components and structures such as bearings, bolts, nuts, etc. It exhibits excellent wear resistance and heat treatability, allowing for further enhancement of strength and hardness through quenching and tempering. Its chemical composition includes alloying elements like nickel, molybdenum, etc., to increase strength and wear resistance. SCM415S is typically employed in high-load, high-temperature, and high-pressure environments, such as automotive parts and mechanical components.

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12L14 (DIN 9SMnPb36) Pb-series

12L14（DIN 9SMnPb36）is a highly machinable carbon steel conta

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12L14 (DIN 9SMnPb36) Pb-series

12L14（DIN 9SMnPb36）is a highly machinable carbon steel containing elevated levels of lead and sulfur to enhance machinability. It exhibits excellent machinability, processability, and surface finish, making it suitable for automatic machining and screw production. The addition of selenium can improve machinability but affects chip breaking. It's commonly used in manufacturing screws, bolts, bearings, etc.

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1215 S-series

Metal material 1215 is a type of carbon steel known for its

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1215 S-series

Metal material 1215 is a type of carbon steel known for its excellent machinability. It features high strength, good surface finish, and is commonly used in automatic machining, bolts, nuts, bearings, etc. Lowering sulfur content improves machinability, while adding phosphorus enhances mechanical properties. Maintaining stable machining temperatures and speeds is crucial for product quality.

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1215 S-series

Metal material 1215 is a type of carbon steel known for its

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1215 S-series

Metal material 1215 is a type of carbon steel known for its excellent machinability. It features high strength, good surface finish, and is commonly used in automatic machining, bolts, nuts, bearings, etc. Lowering sulfur content improves machinability, while adding phosphorus enhances mechanical properties. Maintaining stable machining temperatures and speeds is crucial for product quality.

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1215 S-series

Metal material 1215 is a type of carbon steel known for its

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1215 S-series

Metal material 1215 is a type of carbon steel known for its excellent machinability. It features high strength, good surface finish, and is commonly used in automatic machining, bolts, nuts, bearings, etc. Lowering sulfur content improves machinability, while adding phosphorus enhances mechanical properties. Maintaining stable machining temperatures and speeds is crucial for product quality.

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1144 Medium carbon

Metal material 1144 is a type of easily machinable carbon st

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1144 Medium carbon

Metal material 1144 is a type of easily machinable carbon steel with a moderate carbon content. Its characteristics include high strength, excellent machinability, and wear resistance. In terms of machining, 1144 material is easy to work with, although distortion may occur after heat treatment. It is commonly used in the manufacturing of bolts, bearings, and connecting components. By controlling the carbon content, its hardness and strength can be adjusted, while the addition of alloying elements such as silicon, nickel, and molybdenum can enhance corrosion resistance and mechanical properties.

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1144 Medium carbon

Metal material 1144 is a type of easily machinable carbon st

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1144 Medium carbon

Metal material 1144 is a type of easily machinable carbon steel with a moderate carbon content. Its characteristics include high strength, excellent machinability, and wear resistance. In terms of machining, 1144 material is easy to work with, although distortion may occur after heat treatment. It is commonly used in the manufacturing of bolts, bearings, and connecting components. By controlling the carbon content, its hardness and strength can be adjusted, while the addition of alloying elements such as silicon, nickel, and molybdenum can enhance corrosion resistance and mechanical properties.

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1144 Medium carbon

Metal material 1144 is a type of easily machinable carbon st

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1144 Medium carbon

Metal material 1144 is a type of easily machinable carbon steel with a moderate carbon content. Its characteristics include high strength, excellent machinability, and wear resistance. In terms of machining, 1144 material is easy to work with, although distortion may occur after heat treatment. It is commonly used in the manufacturing of bolts, bearings, and connecting components. By controlling the carbon content, its hardness and strength can be adjusted, while the addition of alloying elements such as silicon, nickel, and molybdenum can enhance corrosion resistance and mechanical properties.

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Steel data

Standard Code Spec No. Material No. Mark
CNS 4004 SUM23
JIS G4804 SUM23
AISI 1215
AISI 1215MS
DIN 1.0736 11SMn37
CNS 4004 SUM24L
JIS G4804 SUM24L
AISI 12L14
DIN 1.0718 11SMnPb30
DIN 1.0737 11SMnPb37
DIN 1651 1.0737 9SMnPb36
JIS SMIGGREEN-CS1
JIS SUM24L-EZ
DIN 1651 1.0736 9SMn36
CNS 4004 SUM43
JIS G4804 SUM43
AISI 1144
JIS G4052 SCM415HL2
JIS G4052 SCM435HL2
JIS G4053 SCM415S
JIS G4053 SCM435S
DIN 17210 16MnCrS5
JIS G4052 SCM415L2
(C)% (Si)% (Mn)% (P)% (S)% (Ni)% (Cr)% (Mo)% (Pb)% Thickness(mm) Yield strength(Mpa) Tensile strength(Mpa) Elongation(%) Remarks
≦ 0.09 0.75~1.05 0.04~0.09 0.26~0.35
≦ 0.09 0.75~1.05 0.04~0.09 0.26~0.35
≦ 0.09 0.75~1.05 0.04~0.09 0.26~0.35
≦ 0.09 1.1~1.6 0.04~0.09 0.33~0.42
≦ 0.14 ≦ 0.05 1~1.5 ≦ 0.11 0.34~0.4
≦ 0.15 0.85~1.15 0.04~0.09 0.26~0.35 0.1~0.35
≦ 0.15 0.85~1.15 0.04~0.09 0.26~0.35 0.1~0.35
≦ 0.15 ≦ 0.05 1~1.5 ≦ 0.11 0.3~0.4 19~32 ≧ 410 ≧ 540 ≧ 10
≦ 0.14 ≦ 0.05 0.9~1.3 ≦ 0.11 0.27~0.33 0.2~0.35
≦ 0.14 ≦ 0.05 1~1.5 ≦ 0.11 0.34~0.4 0.2~0.35
≦ 0.15 ≦ 0.05 1~1.5 ≦ 0.1 0.32~0.4 0.15~0.3 16~40 ≧ 390 490~740 ≧ 8
≦ 0.15 0.9~1.7 0.04~0.09 0.4~0.7 替代12L14
≦ 0.15 0.9~1.11 0.4~0.09 0.4~0.7 替代12L14
≦ 0.15 ≦ 0.05 1~1.5 ≦ 0.1 0.32~0.4 16~10 ≧ 440 560~740 ≧ 6
0.4~0.48 1.35~1.65 ≦ 0.03 ≦ 0.03
0.4~0.48 1.35~1.65 ≦ 0.04 0.24~0.33
0.4~0.48 1.35~1.65 ≦ 0.04 0.24~0.33
0.12~0.18 0.15~0.35 0.55~0.95 ≦ 0.03 ≦ 0.03 ≦ 0.25 0.85~1.25 0.15~0.35 0.1~0.3
0.32~0.39 0.15~0.35 0.55~0.9 ≦ 0.03 ≦ 0.03 ≦ 0.25 0.85~1.25 0.15~0.35 0.1~0.3
0.12~0.18 0.15~0.35 0.55~0.9 ≦ 0.03 0.09~0.107 ≦ 0.25 0.85~1.25 0.15~0.35
0.32~0.39 0.15~0.35 0.55~0.9 ≦ 0.03 0.09~0.107 ≦ 0.25 0.85~1.25 0.15~0.35
0.14~0.19 ≦ 0.4 1~1.3 ≦ 0.025 0.02~0.04 0.8~1.1
0.12~0.18 0.15~0.35 0.55~0.95 ≦ 0.03 ≦ 0.03 ≦ 0.25 0.85~1.25 0.15~0.35 0.1~0.3