Side Cutter 205-70-74180 Earth Moving Machinery Spare Parts

What type of steel does 50Mn steel belong to

50Mn steel belongs to ‌ high-quality carbon structural steel ‌. Its core characteristics and classification basis are as follows:

‌ I. Material types and standards ‌

Steel grade type ‌

50Mn is a high-quality carbon structural steel that complies with the Chinese national standard ‌GB/T 699-1999‌. Internationally, it corresponds to grades such as the Japanese standard ‌S53C‌, the American standard ‌1050/1053‌, and the German standard ‌C50‌.

Naming meaning ‌

"50"‌ : indicates an average carbon content of approximately ‌0.50%‌ (actual range ‌0.48%-0.56%‌);

"Mn"‌ : indicates that manganese is the main strengthening element, with a content of ‌0.70%-1.00%‌, significantly enhancing hardenability and wear resistance.

⚖️ ‌ II. Chemical Composition characteristics ‌

Element content range (%) function

Carbon (C)‌ 0.48-0.56 provides basic strength and hardness

Manganese (Mn)‌ 0.70-1.00 enhances hardenability and improves wear resistance

Sulfur/phosphorus (S/P)‌ ≤0.035 strictly control impurities to ensure the purity of the material

Other elements (such as Si, Cr, Ni, etc.) are trace residues and are all subject to national standards.

⚙️ ‌ III. Distinction from alloy steel ‌

The nature of non-alloy steel ‌

Although 50Mn contains a relatively high amount of manganese, it does not deliberately add alloy components such as chromium and nickel. It strictly belongs to ‌ high-manganese carbon steel ‌ rather than alloy steel.

Compared with alloy steel 50Mn2‌

50Mn2‌ (GB/T 3077) contains as much as ‌1.40%-1.80%‌ and is classified as ‌ alloy structural steel ‌;

The manganese content of 50Mn is lower (≤1.00%), and no other alloying elements are added.

‌ IV. Typical performance and limitations ‌

Characteristics, advantages, limitations

Mechanical properties: ‌ Tensile strength ≥645MPa, yield strength ≥390MPa. Poor weldability and prone to cracking

Heat treatment adaptability ‌ After quenching and tempering, hardness and elasticity are significantly improved. There is a tendency for overheating sensitivity and tempering brittleness

‌ V. Core application scenarios ‌

Mainly manufacture three types of key components:

High-load wear-resistant parts ‌ : gear shafts, friction discs, mandrels (diameter ≤80mm);

Transportation components ‌ : train axles, automotive crankshafts, connecting rods;

Elastic element ‌ : structural components such as flat springs that require high elasticity.

In summary, 50Mn, through the formula design of ‌ "medium carbon + high manganese" ‌, achieves performance close to that of low alloy steel within a carbon steel frame, making it a cost-effective choice for wear-resistant load-bearing parts.