50Mn steel plate is a medium-carbon manganese steel known for its high strength, good wear resistance, and moderate hardenability, making it suitable for applications requiring structural robustness and durability. Below is a detailed overview of its properties, manufacturing, applications, and key considerations:

Material Classification and Standards

50Mn belongs to the carbon-manganese structural steel category, defined by Chinese standard GB/T 699-2015《Carbon Structural Steels》. It is equivalent to ASTM A29/A29M Grade 1050 (modified with higher manganese) and DIN 17200 Grade C50E in some applications, though exact compositions may vary by standard.

Chemical Composition

The chemical composition of 50Mn (per GB/T 699-2015) is tightly controlled to balance strength and processability:

 

Carbon (C): 0.47–0.55% (primary strengthener, enhances hardness and wear resistance).

Manganese (Mn): 0.70–1.00% (improves hardenability, tensile strength, and reduces brittleness).

Silicon (Si): ≤0.37% (aids deoxidation and enhances strength).

Phosphorus (P): ≤0.035% (strictly limited to avoid brittleness).

Sulfur (S): ≤0.035% (minimized to prevent hot cracking during processing).

 

 

 

 

Mechanical Properties

50Mn's mechanical performance is highly dependent on heat treatment, with significant differences between annealed and quenched-tempered (Q&T) states:

 

Property	Annealed State	Quenched & Tempered (Q&T)	Test Standard
Tensile Strength (σb)	≥645 MPa	785–980 MPa	GB/T 228.1-2010
Yield Strength (σs/σ0.2)	≥390 MPa	≥635 MPa	GB/T 228.1-2010
Elongation (δ5)	≥17%	10–15%	GB/T 228.1-2010
Impact Toughness (αkv)	≥20 J/cm² (at 20°C)	≥30 J/cm² (at 20°C)	GB/T 229-2020
Hardness (HBW)	197–255	241–302 (after tempering)	GB/T 231.1-2018

 

 

 

 

 

 

 

 

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