A Comprehensive Guide to 50Mn steel

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Update time : 2024-02-02 17:17:51

50Mn steel is a high-quality carbon structural steel. The strength, elasticity and hardness of 50Mn steel are high, which are mostly used after quenching and tempering, and the welding performance is poor. 50Mn round steel is used to manufacture heat-treated parts with high wear resistance and high load, such as gears, gear shafts and mandrels with sections below 80 mm. The properties are similar to those of 50# steel, but its hardenability is higher, and the strength, hardness and elasticity after heat treatment are slightly higher than those of 50 # steel. It has poor weldability, overheating sensitivity and temper brittleness tendency. They are used as stress-bearing parts, high wear-resistant parts, and high-stress parts, such as mandrels with a diameter of less than 80 mm. After high-frequency quenching, it can also manufacture train shafts, worms, connecting rods and automobile crankshafts, such as gears, gear shafts, friction discs, mandrels, and flat springs.

50mn steel - A Comprehensive Guide to 50Mn steel

Equivalent grade for 50Mn steel

Name Standard
Standard or Agreement Representative Brand ASME/


High-quality carbon GB/T 20 1020 S20C C22E C22E
45 1045 S45C C45E C45E
20Mn 1022 SWRCH22K CK22 20M5
50Mn 1053 SWRCH50K CK50 C45

Chemical Composition of 50Mn steel

Grade Chemical Composition%
C Si Mn Cr Ni Cu
Not greater than
20# 0.17-0.24% 0.17-0.37 0.35-0.65 0.25 0.3 0.25
45# 0.42-0.50 0.17-0.37 0.50-0.80 0.25 0.3 0.25
20Mn 0.17-0.24 0.17-0.37 0.70-1.00 0.25 0.25 0.25
50Mn 0.48-0.56 0.17-0.37 0.70-1.00 0.25 0.25 0.25

Mechanical Property of 50Mn steel

Grade Mechanical Property Hardness of delivery

Not greater than

Tensile Strength

σb (MPa)

Yield Strength

σs (MPa)

Elongation Rate

δ5 (%)

Shrinkage Ratio/ψ(%) Impact Energy/Akv (J)
Not less than Non thermal treatment/(HB) Annealed steel/(HB)
20# 410 245 25 55 156
45# 600 355 16 40 39 229 197
20Mn 450 275 24 50 197
50Mn 645 390 13 40 31 255 217

The heat treatment process of 50Mn steel

The heat treatment process of 50Mn steel is a commonly used heat treatment method for steel processing. This process mainly involves heating and cooling steel to change its microstructure and properties, thereby improving its strength, hardness, and wear resistance. In this article, we will provide a detailed introduction to the steps, influencing factors, and application areas of the heat treatment process for 50Mn steel.

(1) Heat treatment process steps of 50Mn steel


Firstly, before conducting heat treatment on 50Mn steel, it is necessary to heat it to an appropriate temperature. The heating temperature is usually determined based on the composition, morphology, and required properties of the steel. During the heating process of 50Mn steel, attention should be paid to avoiding temperatures that are too high or too low to avoid irreversible damage to the steel.

Holding time

Once the appropriate heating temperature is reached, it is necessary to maintain it for a certain period to ensure that the entire steel is uniformly heated. The holding time depends on the size and thickness of the steel. Steel of larger size and thickness requires longer holding time to ensure that its internal temperature reaches equilibrium.


After completing the heating and holding time, the steel needs to be rapidly cooled. The cooling rate has a significant impact on the performance of steel. Common cooling methods include water quenching, oil quenching, and air cooling. The choice of appropriate cooling method depends on the required steel properties.

(2) Influencing factors

Various factors influence the effect of the heat treatment process on 50Mn steel.


Heating temperature is one of the key factors affecting the effectiveness of heat treatment. Excessive or insufficient temperature can lead to unsatisfactory results. When determining the heating temperature, it is necessary to consider the composition, morphology, and required properties of the steel and refer to relevant standards or empirical data.

Holding time

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