Carbon and Mn. Steel-JUNG YI STEEL

Product Applications

Mn. Steel can be simply used to produce low-cost products with high strength such as: farm tools (hoe, axes), bolts & nuts(large), steel rack for bikes and motorcycle.

SMn433

[Characteristics] ▪ 45Mn is manganese steel for mechanical

SMn433

[Characteristics]
▪ 45Mn is manganese steel for mechanical structures, which can achieve excellent comprehensive mechanical properties after quenching and tempering.
▪ Compared to S45C, it generally offers better hardenability, strength, and toughness, making it suitable for medium to high-load components.
▪ Machinability is acceptable, but cold workability is inferior to that of ordinary carbon steel, and weldability is relatively weak.
▪ It can undergo quenching and tempering treatments, making it suitable for post-heat treatment use, but care must be taken regarding temper embrittlement.
▪ Commonly used in transmission components requiring impact resistance and alternating load endurance.
[Mechanical Properties]
▪ After quenching and tempering, it can achieve a high combination of strength and toughness, suitable for medium to high-load components.
▪ Specific tensile strength, yield strength, and hardness will vary depending on heat treatment conditions and specifications. It is recommended to confirm based on actual supply specifications or manufacturer datasheets.

▪ When used in universal joints, the focus is typically on torque carrying capacity, fatigue strength, and wear resistance compatibility.
▪ For precise values, it is advisable to consult tables based on actual supply brands or heat treatment conditions.

[Applications]
▪ Universal joints, universal joint components.
▪ Transmission components such as drive shafts, mandrels, crankshafts, and connecting rods.
▪ Transmission system components that require torque and angular deflection tolerance.
▪ Commonly found in automotive, mechanical transmission, and general industrial equipment.

[Additional Notes]
▪ 45Mn is manganese steel for mechanical structures, often used in tempered condition for transmission components like universal joints.
▪ A universal joint is a transmission element used to connect two shafts and compensate for angular misalignment. Actual material selection requires evaluation of torque, rotational speed, lifespan, and lubrication conditions.
▪ 45Mn is not the sole commonly used material for universal joints, and actual selection can be made based on requirements and specifications.

45Mn2 (Friction plate)

[Characteristics] ▪45Mn2 is a medium-carbon manganese allo

45Mn2 (Friction plate)

[Characteristics]
▪45Mn2 is a medium-carbon manganese alloy structural steel, which is often used in quenched and tempered state and belongs to a high-strength alloy material.
▪Manganese content is about 1.4-1.8%, which can improve strength, hardenability and wear resistance, and is more suitable for bearing higher load than the general 45 steel system.
▪The machinability is acceptable, but the cold workability is worse than that of ordinary carbon steel, the weldability is weak, and there is a tendency to temper brittleness.
▪It can be quenched and tempered, suitable for use after heat treatment, and is often used for parts that bear friction, impact and fatigue loads.

[Mechanical properties]
▪Tensile strength: ≥ 885 MPa.
▪Yield strength: ≥ 735 MPa.
▪Elongation: ≥ 10%.
▪The specific tensile strength, yield strength and hardness will vary according to heat treatment conditions and feeding specifications.

[Application]
▪Friction transmission parts such as friction discs, friction plates and clutch discs.
▪Gears, shafts, spindles, connecting rods and other mechanical structural parts that bear high loads.
▪Parts with both strength and wear resistance are needed in automobile and mechanical transmission systems.
▪Other parts of general industrial equipment requiring high strength and good hardenability.

[Supplement]
▪The standard of 45mn2 is GB/T 3077, which belongs to alloy structural steel and is often used with friction discs in quenched and tempered state.
▪As a friction disc, it is often combined with high-frequency quenching, carburizing or surface hardening to improve the hardness and life of friction surface.
▪The actual material selection should be based on the conditions of torque, speed, service life, lubrication and working temperature, and compared with other similar materials.

SMn420

[Characteristics] ▪ SMn420 is a manganese based alloy steel

SMn420

[Characteristics]
▪ SMn420 is a manganese based alloy steel for mechanical construction according to JIS G4053, which belongs to low-carbon low-alloy steel and is commonly used in quenched and tempered or carburized states.
▪ The carbon content is about 0.17-0.23%, the manganese content is about 1.4-1.5%, the strength is moderate, the plasticity and cold deformation are good, and the low-temperature performance is excellent.
▪ The hardenability is better than that of carbon steel with the same carbon content, and it can be used as one of the alternative materials for 20Cr, suitable for smaller section parts.
▪ It can be subjected to heat treatment such as quenching and tempering, carburizing, and carbonitriding, and is often used in conjunction with diesel engine sleeves, piston pins, shafts, and other parts in a carburizing state.

[Mechanical properties]
▪ Tensile strength: ≥ 785 MPa.
▪ Yield strength: ≥ 590 MPa.
▪ Elongation rate: ≥ 10%.
▪ Sectional shrinkage rate: ≥ 40%.
▪ Impact toughness: ≥ 59 J/cm ².
▪ Under annealing or high-temperature tempering conditions, the Brinell hardness is generally ≤ 187 HB, and the actual value may vary depending on the heat treatment conditions and feed specifications.

[Application]
▪ Internal moving parts such as diesel engine sleeves, cylinder liners, and liners.
▪ Small section carburized parts such as piston pins, steel sleeves, small shafts, gear pins, etc.
▪ Automotive and industrial mechanical structural components, such as cold forged bolts, shaft attachments, etc.
▪ Other mechanical structural components that require moderate strength, good plasticity, and carburizing performance.

[Additional]
▪ The standard is JIS G4053, which belongs to manganese steel for mechanical construction. It is often used in conjunction with diesel engine sleeves and other parts in a quenched and tempered or carburized state.
▪ As a sleeve component, it is often combined with carburizing and surface hardening treatment to improve surface hardness and wear resistance, while maintaining core toughness.
▪ The actual material selection needs to be based on the operating conditions of the diesel engine (temperature, lubrication, load, and service life requirements) and corresponding design specifications, and compared and evaluated with other manganese steel or carburizing steel grades.

SMn420 (Diesel engine sleeve)

[Characteristics] SMn433 is a low-alloy steel for mechanic

SMn438 (Crankshaft)

[Characteristics] ▪ SMn438 is a manganese based alloy stee

SMn438 (Crankshaft)

[Characteristics]
▪ SMn438 is a manganese based alloy steel for mechanical construction according to JIS G4053. It belongs to medium carbon manganese steel and is often used in a quenched and tempered state. It is a high-strength and tough material.
▪ The carbon content is about 0.35-0.41%, and the manganese content is about 1.35-1.65%. Compared with SMn433, SMn433 has higher carbon and manganese content, and higher strength and hardness.
▪ Good hardenability, can be quenched and tempered by water or oil cooling, suitable for parts that can withstand high loads and fatigue.
▪ Compared to ordinary carbon steel, it has higher strength, impact resistance, and wear resistance, and is commonly used in mechanical shafts and high load structural components. [Mechanical properties]
▪ After quenching and tempering, a high combination of strength and toughness can be achieved, which is suitable for medium to high load parts.
▪ Tensile strength: ≥ 835 MPa. ▪ Yield strength: ≥ 590 MPa.
▪ Elongation rate: ≥ 10%.
▪ Sectional shrinkage rate: ≥ 40%.
▪ Impact toughness: ≥ 59 J/cm ².
▪ Under annealing or high-temperature tempering conditions, the Brinell hardness is generally ≤ 207 HB, and the actual value may vary depending on the heat treatment conditions and feed specifications.

[Application]
▪ Diesel engines, automotive crankshafts, and other shaft components that withstand high torque and alternating loads.
▪ Connecting rods, shafts, spindles, flange shafts, and high load components of mechanical structures.
▪ High strength structural components such as front and rear axles, ball joints, and U-bolts of automobiles.
▪ Other general industrial equipment parts that require a combination of high strength and good toughness.

[Additional]
▪ The standard is JIS G4053, which belongs to manganese steel for mechanical construction. It is often used in conjunction with high load parts such as crankshafts in a quenched and tempered state.
▪ When used as a crankshaft, it is often combined with high-frequency quenching or local heat treatment to improve the surface hardness and wear resistance of the journal and oil shaft section.
▪ The actual material selection needs to be based on the crankshaft working conditions (torque, speed, service life, and lubrication conditions) and design specifications, and compared and evaluated with manganese steel of the same series as SMn433 and SMn443.

SMn443 (Friction plate)

[Characteristics] ▪ SMn443 is a manganese based alloy stee

SMn443 (Friction plate)

[Characteristics]
▪ SMn443 is a manganese based alloy steel for mechanical construction according to JIS G4106, which belongs to medium carbon manganese steel and is often used in a quenched and tempered state.
▪ The carbon content is higher than SMn438, and the strength, hardness, and wear resistance are better, making it a high-strength and tough material.
▪ Good hardenability, can be quenched and tempered, suitable for withstanding high loads and friction conditions.
▪ Compared to ordinary carbon steel, it has higher strength, impact resistance, and fatigue strength, and is commonly used in high load transmission parts.

[Mechanical properties]
▪ After quenching and tempering, a high combination of strength and toughness can be achieved, which is suitable for medium to high load parts.
▪ Tensile strength: ≥ 780 MPa.
▪ Yield strength: ≥ 635 MPa.
▪ Elongation rate: ≥ 17%.
▪ Sectional shrinkage rate: ≥ 45%.
▪ Impact toughness: ≥ 78 J/cm ².
▪ Under annealing or high-temperature tempering conditions, the Brinell hardness is generally around 229-302 HB, and the actual value may vary depending on the heat treatment conditions and feed specifications.

[Application]
▪ Friction transmission components such as friction discs, clutch discs, and friction plates.
▪ Mechanical structural components such as gears, shafts, spindles, connecting rods, etc. that bear high loads.
▪ High strength components in automobiles, construction machinery, and general industrial equipment.
▪ Other parts that require a combination of high hardness, high wear resistance, and good toughness.

[Additional]
▪ The standard is JIS G4106, which belongs to manganese steel for mechanical construction and is often used in conjunction with friction discs in a quenched and tempered state.
▪ When used as a friction disc, surface hardening or local heat treatment is often combined to improve the hardness and wear resistance of the friction surface.
▪ The actual material selection needs to be based on conditions such as torque, speed, lifespan, lubrication, and working temperature, and compared and evaluated with similar materials such as SMn438 and 45Mn2.

Standard Code	Spec No.	Mark
CNS	3828	S30C
JIS	G4051	S30C
AISI		1030
CNS	3828	S35C
JIS	G4051	S35C
CNS	3828	S45C
GB	699	45Mn
JIS	G4051	S45C
AISI		1045
AISI		1050
GB	3077	15Mn2
GB	3077	45Mn2

(C)%	(Si)%	(Mn)%	(P)%	(S)%	(Ni)%	(Cr)%	(Cu)%	Ni+Cr	Remarks
0.27~0.33	0.15~0.35	0.6~0.9	≦ 0.03	≦ 0.035	≦ 0.2	≦ 0.2	≦ 0.3	≦ 0.35
0.27~0.33	0.15~0.35	0.6~0.9	≦ 0.03	≦ 0.035	≦ 0.2	≦ 0.2	≦ 0.3	≦ 0.35
0.28~0.34		0.6~0.9	≦ 0.04	≦ 0.05
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	0.15~0.35	0.6~0.9	≦ 0.03	≦ 0.035	≦ 0.2	≦ 0.2	≦ 0.3	≦ 0.35
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	0.7~1	≦ 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					Si(%)協定
0.48~0.55		0.6~0.9	≦ 0.04	≦ 0.05
0.12~0.19	0.17~0.37	0.7~1	≦ 0.035	≦ 0.035	≦ 0.25	≦ 0.25	≦ 0.25
0.42~0.49	0.17~0.37	1.4~1.8	≦ 0.035	≦ 0.035

Manganese Steel for Machine Structural use (Mn)

Product Applications

Steel data