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High-Quality 12CrNi3A Alloy Structural Steel from China Suppliers and Factory for Aerospace and Defense Applications
Description
12CrNi3A is a high-quality structural alloy steel whose chemical composition and mechanical properties strictly comply with the requirements of the national military standard GJBB1951-94. Due to its excellent overall performance, this material is widely used in aviation, aerospace, weapons, and other high-end equipment manufacturing.
The main alloying elements of 12CrNi3A steel include chromium (Cr) and nickel (Ni), and its chemical composition range is detailed below:
| Carbon (C) | Chromium (Cr) | Nickel (Ni) | Manganese (Mn) | Silicon (Si) |
|---|---|---|---|---|
| 0.10%~0.16% | 0.60%~0.90% | 2.75%~3.25% | 0.30%~0.60% | 0.17%~0.37% |
The addition of chromium improves the steel's hardenability and corrosion resistance, while nickel significantly enhances the material's toughness and low-temperature performance. This rational composition design enables 12CrNi3A steel to maintain high strength while also having a good balance of plasticity and toughness.
Heat treatment and mechanical properties
12CrNi3A steel is usually treated with a quenching and low-temperature tempering heat treatment process to obtain a tempered martensite structure, thereby achieving a combination of high strength and high toughness. According to the GJBB1951-94 standard, its mechanical properties are generally required as follows:
| Tensile strength | Yield strength | Elongation | Impact toughness |
|---|---|---|---|
| ≥980 MPa | ≥685 MPa | ≥11% | ≥86 J |
The material also has good carburizing properties. After carburizing and quenching, the surface can obtain high hardness and wear resistance, while the core maintains sufficient toughness, making it suitable for manufacturing parts that withstand severe friction and impact loads.
Typical Applications
Thanks to its excellent performance, 12CrNi3A steel is often used to manufacture key components such as gears, shafts, connecting rods, and pins. Its reliability and durability have been fully demonstrated in military equipment, particularly in tank transmission systems, aircraft engine gears, and landing gear components.
Summarize
As a material recommended by the national military standard GJBB1951-94, 12CrNi3A alloy structural steel has scientific composition design, stable performance and mature technology, and can meet the stringent requirements of high-end equipment for high strength, high toughness and wear resistance.
Frequently Asked Questions (FAQ)
What standard does 12CrNi3A alloy steel comply with?
12CrNi3A strictly complies with the requirements of the Chinese national military standard GJBB1951-94, ensuring high quality and reliability for demanding applications.
What are the main chemical composition ranges of 12CrNi3A?
The chemical composition consists of Carbon (0.10%~0.16%), Chromium (0.60%~0.90%), Nickel (2.75%~3.25%), Manganese (0.30%~0.60%), and Silicon (0.17%~0.37%).
What are the typical mechanical properties of 12CrNi3A steel?
Under standard heat treatment, it achieves a tensile strength of ≥980 MPa, yield strength of ≥685 MPa, elongation of ≥11%, and impact toughness of ≥86 J.
How does heat treatment affect 12CrNi3A steel?
It is typically quenched and low-temperature tempered to form a tempered martensite structure, balancing high strength with excellent toughness. It also responds well to carburizing for surface hardness.
What are the primary applications of 12CrNi3A?
It is widely used for heavy-duty components such as gears, shafts, connecting rods, and pins in aviation, aerospace, weapons, and tank transmission systems.