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7709 steel is a high-performance alloy steel, also known as 21CrMoV5-7, and is widely used in the manufacturing of high-strength, high-temperature-resistant fasteners such as bolts and nuts.
(1) Chemical Composition
It mainly consists of: Carbon (C: 0.17–0.25), Silicon (Si: 0.15–0.35), Manganese (Mn: 0.35–0.85), Chromium (Cr: 1.20–1.50), Molybdenum (Mo: 0.65–0.80), and Vanadium (V: 0.25–0.35). The reasonable proportion of these elements gives the steel excellent comprehensive properties.
(2) Mechanical Properties
In the heat-treated state, 1.7709 steel has high strength and good mechanical properties:
(3) Heat Resistance
This material can still maintain good mechanical properties in high-temperature environments and is suitable for working conditions with temperatures exceeding 300°C.
300M is a medium-carbon nickel-chromium-molybdenum alloy steel, featuring the following characteristics:
Tensile strength can reach 1900–2100 MPa, and yield strength is over 1600 MPa, making it suitable for withstanding high loads.
It has good plasticity and toughness, capable of resisting fracture under extreme conditions.
Suitable for applications that require long-term exposure to dynamic loads, such as aircraft components.
Through heat treatment, its hardness and strength can be further enhanced.
High-strength alloy stainless steel plays a crucial role in several high-end fields:
Used for aircraft landing gear, fasteners, and missile components. Provides high hardness and resistance to high-temperature oxidation, solving hydrogen embrittlement issues.
Ideal for deep-sea equipment, pipelines, and chemical reactors. Offers superior resistance to chloride ion stress corrosion cracking compared to austenitic stainless steel.
Used for high-strength fasteners in bridges and tunnels to enhance structural durability.
| High Strength Stainless Steel Product Grades | |||
| 40CrNiMoA | 30CrMnSiA | 21CrMoV5-7 | 1.6772 |
| 20Cr1Mo1VTiB | X22CrMoV12-1 | 1.7709 | 300M |
