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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.

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

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

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

High-Strength Stainless Steel Fasteners Inconel Bolts

0102030405

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

High Strength Alloy Fasteners are expertly crafted by integrating silicon and manganese into high-quality steel. As leading suppliers and manufacturers in China, our factory produces a variety of material grades for these alloy steel fasteners, including 40CrNiMoA, 30CrMnSiA, 21CrMoV5-7, 1.6772, 20Cr1Mo1VTiB, X22CrMoV12-2, 1.7709, and 300M. Our commitment to precision and durability ensures that our high-strength fasteners meet rigorous industry standards, making them an ideal choice for demanding applications. Choose us for reliable fasteners that combine strength, performance, and quality, directly from a trusted factory in China

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.

(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) and other elements. 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:

Yield Strength (Rp0.2)

≥ 550 MPa

Tensile Strength (PM)

≥ 700 MPa

Elongation (A)

≥ 16%

Reduction of Area

≥ 60%

(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.

Characteristics of 300M Material

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

Ultra-High Strength High Toughness Excellent Fatigue Performance Good Hardenability

(1). Ultra-High Strength

The tensile strength can reach 1900–2100 MPa, and the yield strength is over 1600 MPa, making it suitable for withstanding high loads.

High Toughness

It has good plasticity and toughness, capable of resisting fracture under extreme conditions.

(2). Excellent Fatigue Performance

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

Good Hardenability

Through heat treatment (such as quenching and tempering), its 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 (such as the grade with a tensile strength of ≥ 1500 MPa) is used to manufacture key load-bearing components such as landing gear hinges and bolts, replacing the traditional cadmium-plated high-strength steel to solve the hydrogen embrittlement problem.

Missile and engine components: Martensitic stainless steel (such as X46CrS13) is used for the missile shell 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 that of austenitic stainless steel.

Chemical reactor: 1.4945 alloy (containing chromium and nickel) maintains stability under high temperature and high pressure, and is 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, with 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

Q What is 1.7709 steel and what is its other designation?

1.7709 steel is a high-performance alloy steel also known as 21CrMoV5-7. It is widely used in the manufacturing of high-strength, high-temperature-resistant fasteners such as bolts and nuts, valued for its excellent combination of strength, toughness, and heat resistance.

Q What are the key mechanical properties of 1.7709 steel?

In the heat-treated state, 1.7709 steel offers a yield strength (Rp0.2) of ≥ 550 MPa, tensile strength (PM) of ≥ 700 MPa, elongation (A) of ≥ 16%, and reduction of area of ≥ 60%, making it suitable for demanding structural applications.

Q What makes 300M steel different from standard high-strength steels?

300M is a medium-carbon nickel-chromium-molybdenum alloy steel with an exceptionally high tensile strength of 1900–2100 MPa and yield strength exceeding 1600 MPa. Unlike standard high-strength steels, it also offers excellent fatigue performance and toughness, making it ideal for critical aerospace applications such as aircraft landing gear.

Q In which industries are high-strength alloy stainless steels most commonly used?

High-strength alloy stainless steels are most commonly used in aerospace and defense (landing gear, missile components), ocean engineering and petrochemical industries (deep-sea pipelines, chemical reactors), architecture and infrastructure (bridges, tunnels), and emerging technologies such as 3D printing and additive manufacturing.

Q Why is duplex stainless steel preferred for deep-sea and marine applications?

Duplex stainless steel, such as S31803, is preferred for marine and deep-sea applications because its resistance to chloride ion stress corrosion cracking is significantly superior to that of standard austenitic stainless steel. This makes it highly reliable for submarine pipelines, valves, and other offshore equipment exposed to harsh seawater environments.

Q What high-strength alloy steel grades are available?

A range of high-strength alloy steel grades is available, including 40CrNiMoA, 30CrMnSiA, 21CrMoV5-7, 1.6772, 20Cr1Mo1VTiB, X22CrMoV12-1, 1.7709, and 300M. Each grade offers distinct mechanical properties suited to specific engineering and industrial requirements.