50Mn2, alloy structural steel.
Standard: GB/T 3077-1999
【 Main Features 】
This is a high-strength medium carbon quenched and tempered manganese steel with high strength, elasticity, and wear resistance. It also has high hardenability, with a critical hardenability diameter of 10-28mm in oil and 24-49mm in water. Its machinability is still acceptable. This steel can achieve high comprehensive mechanical properties after quenching and tempering, but it is prone to overheating sensitivity and temper brittleness during heat treatment, and has a tendency to crack during water quenching. It is also sensitive to white spots, has poor weldability, and low cold deformation plasticity.
[Application Example]
This type of steel is usually used after quenching and tempering to manufacture parts that work under high stress and wear conditions. When manufacturing parts with a diameter of less than 80mm, the performance of the steel is similar to that of 45Cr; It can also be used after normalizing and high-temperature tempering to manufacture parts with medium load and large cross-sectional dimensions. For example, the main shaft, shaft, and large gear used as rolling bearings in heavy machinery; The transmission spline shaft on the car and the spindle that bears impact loads; Generally used in machinery as gears, worms, gear shafts, crankshafts, connecting rods, etc. In addition, this steel can also be used to manufacture plate springs and flat coil springs.
chemical composition
Silicon Si: 0.17-0.37
Manganese Mn: 1.40-1.80
Phosphorus P: ≤ 0.025
Sulfur S: ≤ 0.025
Chromium Cr: ≤ 0.30
Nickel Ni: ≤ 0.30
Copper Cu: ≤ 0.25
Mechanical properties
Tensile strength (σ b/MPa): ≥ 930
Yield point (σ s/MPa): ≥ 785
Post fracture elongation (δ 5/%): ≥ 9
Sectional shrinkage rate (ψ/%): ≥ 40
Impact absorption energy (Aku2/J): ≥ 39
Brinell hardness (HBS100/3000) (annealed or high-temperature tempered state): ≤ 229
1. The company has established long-term and stable cooperative relationships with multiple well-known steel mills at home and abroad, all of which provide original material certification
2. Wholesale and retail, with favorable prices, superior quality (large quantities are preferred), and timely and fast delivery
3. The company has several large vertical band saws and steel plate precision machining machinery,
4. It is a large enterprise that integrates the sales, wholesale, and machining services of multiple imported high-quality mold steel products
5. Wide channels, sufficient supply of goods, and business scope covering all parts of the country, can meet the needs of customers in various regions
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