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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 Suppliers in China - Ultra-High Strength and High Temperature Resistant Factory Solutions

High Strength Alloy Fasteners are expertly crafted by incorporating silicon and manganese into steel, ensuring exceptional durability and performance. As a leading manufacturer in China, our factory produces various material grades of alloy steel high-strength fasteners, including 40CrNiMoA, 30CrMnSiA, 21CrMoV5-7, 1.6772, 20Cr1Mo1VTiB, X22CrMoV12-2, 1.7709, and 300M. Our commitment to quality makes us a reliable supplier for all your fastening needs. Trust our China factory for high-performance solutions that meet your specifications

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: 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 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 (Rm) ≥ 700 MPa, Elongation (A) ≥ 16%, Reduction of area ≥ 60%.

(3). Heat Resistance

This material maintains 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:

(1). Ultra-High Strength

Tensile strength: 1900–2100 MPa; Yield strength: over 1600 MPa, making it suitable for withstanding extremely high loads.

High Toughness

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

(2). Excellent Fatigue Performance

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

Good Hardenability

Through heat treatment (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 to manufacture key load-bearing components such as landing gear hinges and bolts, replacing 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 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 strong acid and strong base environments.
(3) Architecture and Infrastructure Martensitic stainless steel is used for high-strength fasteners in bridges and tunnels 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)

QWhat is 1.7709 steel and what is it commonly used for?

1.7709 steel, also known as 21CrMoV5-7, is a high-performance alloy steel widely used in manufacturing high-strength, high-temperature-resistant fasteners such as bolts and nuts. It is particularly valued in applications requiring reliable performance at temperatures exceeding 300°C.

QWhat are the key mechanical properties of 1.7709 steel?

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

QHow does 300M steel differ from standard high-strength alloy steels?

300M is a medium-carbon nickel-chromium-molybdenum alloy steel that offers ultra-high strength (tensile strength 1900–2100 MPa) combined with excellent toughness and fatigue resistance. Unlike standard alloy steels, it is specifically engineered for critical aerospace and defense applications where both extreme strength and fracture resistance are required.

QWhy is high-strength alloy stainless steel preferred in aerospace applications?

High-strength alloy stainless steels provide the ideal combination of ultra-high tensile strength, corrosion resistance, and fatigue performance required in aerospace. They are used in critical components such as landing gear, fasteners, and engine parts, and help solve issues like hydrogen embrittlement associated with traditional cadmium-plated steels.

QWhat makes duplex stainless steel suitable for ocean engineering applications?

Duplex stainless steel (such as S31803) offers superior resistance to chloride ion stress corrosion cracking compared to austenitic stainless steel. This makes it highly suitable for deep-sea pipelines, submarine equipment, and marine valves that are continuously exposed to harsh saltwater environments.

QCan high-strength alloy steels be used in 3D printing and additive manufacturing?

Yes. Alloys such as 1.4310CSPANN can be fabricated into complex components through laser cladding technology, achieving a strength of up to 1200 MPa. This makes high-strength alloy steels increasingly relevant in emerging additive manufacturing fields where complex geometries and high performance are both required.