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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

Our High Strength Alloy Fasteners, expertly crafted in China, utilize a blend of silicon and manganese to enhance the durability and performance of steel. These fasteners are essential for demanding applications, ensuring reliability and strength.

Common material grades for our alloy steel high-strength fasteners include 40CrNiMoA, 30CrMnSiA, 21CrMoV5-7, 1.6772, 20Cr1Mo1VTiB, X22CrMoV12-2, 1.7709, and 300M. As a trusted factory and supplier, we are committed to providing high-quality fasteners that meet the rigorous standards required in various industries.

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:

(1). Chemical Composition

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: 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 2.300M Material

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

(1). Ultra-High Strength

Tensile strength reaches 1900–2100 MPa; yield strength exceeds 1600 MPa, making it suitable for withstanding high loads.

High Toughness

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

(2). Excellent Fatigue Performance

Suitable for applications requiring 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 (tensile strength ≥ 1500 MPa) is used for landing gear hinges and bolts, replacing cadmium-plated high-strength steel to solve hydrogen embrittlement.

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) for submarine pipelines and valves — superior chloride ion stress corrosion cracking resistance.

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

(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 (FAQ)

Q What is 1.7709 steel and what is it also known as?

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, particularly in demanding industrial applications.

Q What are the key mechanical properties of 1.7709 steel?

In the heat-treated state, 1.7709 steel exhibits 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%, ensuring excellent structural reliability.

Q What makes 300M steel suitable for aerospace applications?

300M steel offers ultra-high tensile strength of 1900–2100 MPa and yield strength exceeding 1600 MPa, combined with excellent toughness and fatigue performance. These properties make it ideal for critical aerospace components that must withstand extreme dynamic and static loads.

Q Which high-strength alloy steel grades are available?

Available grades include 40CrNiMoA, 30CrMnSiA, 21CrMoV5-7, 1.6772, 20Cr1Mo1VTiB, X22CrMoV12-1, 1.7709, and 300M. Each grade is tailored to specific mechanical and environmental performance requirements.

Q How is high-strength alloy stainless steel used in ocean engineering?

In ocean engineering, duplex stainless steel (such as S31803) is used for submarine pipelines and valves due to its superior resistance to chloride ion stress corrosion cracking. Additionally, 1.4945 alloy is used in chemical reactors for stability under high temperature, high pressure, and aggressive chemical environments.

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

Yes. The 1.4310CSPANN alloy can be fabricated into complex components through laser cladding technology in additive manufacturing processes, achieving a strength of 1200 MPa. This makes it suitable for emerging technology applications requiring intricate geometries and high structural performance.