30CrMnSiNi2A

Scope of supply of Aviation Group:

Round rods, steel plates, non-standard forgings, rings, seamless pipes, non-standard customization, welcome to inquire!

1. Introduction to 30CrMnSiNi2A materials

      After heat treatment, 30CrMnSiNi2A alloy structural steel can obtain high strength, good plasticity and toughness, good fatigue resistance and fracture toughness, and low fatigue crack propagation rate.

2. Chemical composition of 30CrMnSiNi2A

3. Mechanical properties of 30CrMnSiNi2A

Tensile strength σb (MPa): 1)1767; 2)1627

Elongation δ5 (%): 1)12; 2)13

Section shrinkage ψ (%): 50

Impact toughness value αku (J/cm2): 1)79; 2)90

Sample size: bar

IV. Physical properties of 30CrMnSiNi2A

      30CrMnSiNi2A heat treatment specifications and metallographic structure:

      Heat treatment specifications: 1) Oil quenching at 890-900℃, tempering at 200-300℃, air-cooling; 2) Heating at 890-900℃, quenching into a medium-temperature of 210-280℃ nitrifying salt tank for 1 hour, air-cooling, and then back-cooling at 200-300℃, air-cooling.

Metallographic structure: 1) High-temperature tempering after hot rolling or cold rolling is pearlite; 2) Normalized and high-temperature tempering is tempered cortexite; 3) Isothermal annealing is sheet pearlite and ferrite; 4) Normalized state is martensite and bainite; 5) Used state is tempered martensite.

       Critical temperature of 30CrMnSiNi2A steel

Note: 1. Steel composition (%) used: 0.27C, 1.05Si, 1.06Mn, 1.05Cr, 1.66Ni, 0.013P, 0.005S;

       2. Steel composition (%) used: 0.30C, 1.10Si, 1.07Mn, 1.06Cr, 1.50Ni, 0.014P, 0.005S. 

V. Characteristics and scope of application of 30CrMnSiNi2A

      30CrMnSiNi2A has high hardenability, good machining and welding properties, but is more sensitive to notch and hydrogen embrittlement (including environmental hydrogen embrittlement).

      30CrMnSiNi2A is suitable as important stress-bearing structural components such as high-strength connectors and shaft parts.