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Non-Magnetic Fasteners--suitable for precision machinery and aerospace applications, avoiding magnetic interference to the equipment

Special Material Bolts--include super stainless steel, titanium alloys, nickle-based alloys, copper-nickle alloys, cobalt alloys, NASA AMS high-performance materials, etc.

Plastic Fasteners---It is lightweight and corrosion resistance

Classification Society Fasteners---used in ships and marine engineering

High-End Special Raw Material Spring Wire---with high tensile strength

Precision Machined Parts --Ultra High Precision,used in precision electronics, medical equipment, semiconductor equipment, inspection instrument, optical equipment and other fields.

Low Temperature Fasteners-- low Temperature stability, resistance to corrosion

High Temperature Fasteners-- maintain high strength under high temperatures

High Strength Alloy Fasteners--high temperature resistant and Ultra-high strength

High-Strength Stainless Steel Fasteners Inconel Bolts

0102030405

High Strength Alloy Fasteners from China Suppliers - Ultra-High Strength and High Temperature Resistant Factory Products

China's High Strength Alloy Fasteners are engineered using advanced materials that combine steel with additives like silicon and manganese for enhanced durability. Our factory produces a variety of common material grades including 40CrNiMoA, 30CrMnSiA, 21CrMoV5-7, 1.6772, 20Cr1Mo1VTiB, X22CrMoV12-2, 1.7709, and 300M. As a leading supplier in the industry, we ensure that our alloy steel fasteners meet the highest standards of strength and reliability for your specific applications. Choose us for high-quality fasteners that perform exceptionally in demanding environments

Product Detail

7709 Material Characteristics

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. The following is an in-depth introduction to the screws made of 1.7709 material:

⚗️ Chemical Composition

C: 0.17–0.25 | Si: 0.15–0.35 | Mn: 0.35–0.85 | Cr: 1.20–1.50 | Mo: 0.65–0.80 | V: 0.25–0.35. The balanced proportion of these elements delivers excellent comprehensive properties.

💪 Mechanical Properties

Yield strength (Rp0.2) ≥ 550 MPa | Tensile strength (PM) ≥ 700 MPa | Elongation (A) ≥ 16% | Reduction of area ≥ 60%.

🔥 Heat Resistance

Maintains good mechanical properties in high-temperature environments. Suitable for working conditions with temperatures exceeding 300°C.

Characteristics of 300M Material

300M is a medium-carbon nickel-chromium-molybdenum alloy steel, featuring the following characteristics:

⚡ Ultra-High Strength

Tensile strength: 1900–2100 MPa
Yield strength: > 1600 MPa
Suitable for withstanding extremely high loads.

🛡️ High Toughness

Good plasticity and toughness, capable of resisting fracture under extreme conditions.

🔄 Excellent Fatigue Performance

Suitable for applications requiring long-term exposure to dynamic loads, such as aircraft components.

🔩 Good Hardenability

Through heat treatment (quenching and tempering), hardness and strength can be further enhanced.

Application

High-strength alloy stainless steel, due to its excellent mechanical properties, corrosion resistance and processing adaptability, plays a crucial role in several high-end fields.

(1) Aerospace and Defense Industry

Aircraft landing gear and fasteners: Ultra-high strength stainless steel (tensile strength ≥ 1500 MPa) is used to manufacture key load-bearing components such as landing gear hinges and bolts, replacing traditional cadmium-plated high-strength steel to solve hydrogen embrittlement problems.

Missile and engine components: Martensitic stainless steel (such as X46CrS13) is used for missile shells and engine locking hooks, featuring high hardness and resistance to high-temperature oxidation.

(2) Ocean Engineering and Petrochemical Industry

Deep-sea equipment and pipelines: Duplex stainless steel (such as S31803) is used for submarine pipelines and valves. Its resistance to chloride ion stress corrosion cracking is superior to austenitic stainless steel.

Chemical reactor: 1.4945 alloy (containing chromium and nickel) maintains stability under high temperature and high pressure, suitable for environments with strong acids and strong bases.

(3) Architecture and Infrastructure

Bridges and Tunnels: Martensitic stainless steel is used for high-strength fasteners to enhance durability.

(4) Emerging Technology Fields

3D Printing and Additive Manufacturing: 1.4310CSPANN alloy is fabricated into complex components through laser cladding technology, achieving a strength of 1200 MPa.

High Strength Alloy Steel Available Types

High Strength Stainless Steel Product Grade
40CrNiMoA	30CrMnSiA	21CrMoV5-7	1.6772
20Cr1Mo1VTiB	X22CrMoV12-1	1.7709	300M

Frequently Asked Questions (FAQ)

Q What is 1.7709 steel and what is it commonly used for?

1.7709 steel, also known as 21CrMoV5-7, is a high-performance chromium-molybdenum-vanadium alloy steel. It is primarily used in the manufacturing of high-strength, high-temperature-resistant fasteners such as bolts and nuts, especially in applications where operating temperatures exceed 300°C.

Q What are the key mechanical properties of 1.7709 steel after heat treatment?

After heat treatment, 1.7709 steel achieves a yield strength (Rp0.2) of ≥ 550 MPa, a tensile strength (PM) of ≥ 700 MPa, an elongation (A) of ≥ 16%, and a reduction of area of ≥ 60%, making it highly reliable for demanding structural applications.

Q Why is 300M steel preferred for aerospace applications?

300M steel is preferred in aerospace due to its ultra-high tensile strength (1900–2100 MPa), excellent fatigue performance under dynamic loads, and good toughness. These properties make it ideal for critical components such as aircraft landing gear, where both strength and resistance to fracture are essential.

Q What is the difference between 1.7709 and 300M in terms of application?

1.7709 is optimized for high-temperature environments (above 300°C) and is commonly used in heat-resistant fasteners and structural components. 300M, on the other hand, is designed for ultra-high-strength applications such as aerospace landing gear and aircraft structural parts, where extreme tensile and fatigue resistance are prioritized over heat resistance.

Q How does duplex stainless steel (S31803) compare to austenitic stainless steel in ocean engineering?

Duplex stainless steel such as S31803 offers superior resistance to chloride ion stress corrosion cracking compared to standard austenitic stainless steel. This makes it the preferred choice for deep-sea pipelines, submarine valves, and other ocean engineering applications where exposure to seawater and high pressure is constant.

Q Can high-strength alloy steel be used in 3D printing or additive manufacturing?

Yes. Alloys such as 1.4310CSPANN can be processed through laser cladding technology to produce complex components with a strength of up to 1200 MPa. This makes high-strength alloy steel increasingly viable in emerging additive manufacturing applications, enabling the production of precision parts with superior mechanical performance.