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

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

High Strength Alloy Fasteners are essential components manufactured by adding silicon and manganese to steel. These fasteners are widely recognized for their exceptional durability and resistance, making them a preferred choice in various industries. Our factory specializes in producing high-quality alloy steel high-strength fasteners, adhering to common material grades such as 40CrNiMoA, 30CrMnSiA, 21CrMoV5-7, 1.6772, 20Cr1Mo1VTiB, X22CrMoV12-2, 1.7709, and 300M, As leading suppliers in China, we ensure that our fasteners meet rigorous quality standards and provide reliable solutions for your engineering and manufacturing needs. Choose our high-strength alloy fasteners for superior performance and durability

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Product Description

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

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

Yield Strength (Rp0.2): ≥ 550 MPa
Tensile Strength (Rm): ≥ 700 MPa
Elongation (A): ≥ 16%
Reduction of Area: ≥ 60%

(3) 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:

(1) 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.

(2) 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), 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 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, 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 (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 widely used in the manufacturing of high-strength, high-temperature-resistant fasteners such as bolts, nuts, and screws, particularly in applications where elevated temperatures and mechanical stress are present.

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 (Rm) of ≥ 700 MPa, elongation (A) of ≥ 16%, and reduction of area of ≥ 60%. These properties make it ideal for demanding structural and thermal applications.

Q How does 300M steel differ from 1.7709 steel?

300M is a medium-carbon nickel-chromium-molybdenum alloy steel with significantly higher strength levels — tensile strength of 1900–2100 MPa and yield strength over 1600 MPa — compared to 1.7709. While 1.7709 excels in high-temperature resistance, 300M is primarily chosen for ultra-high-strength applications such as aerospace components where extreme load-bearing capacity is critical.

Q What industries commonly use high-strength alloy stainless steel?

High-strength alloy stainless steel is widely used across aerospace and defense (landing gear, missile components), ocean engineering and petrochemical industries (deep-sea pipelines, chemical reactors), architecture and infrastructure (bridges, tunnels), and emerging technology fields such as 3D printing and additive manufacturing.

Q Can 1.7709 steel maintain its properties at high temperatures?

Yes. One of the key advantages of 1.7709 (21CrMoV5-7) steel is its heat resistance. It can maintain good mechanical properties in high-temperature environments and is suitable for working conditions where temperatures exceed 300°C, making it a preferred material for thermal power and pressure vessel applications.

Q What grades of high-strength stainless steel are available?

Available grades include 40CrNiMoA, 30CrMnSiA, 21CrMoV5-7, 1.6772, 20Cr1Mo1VTiB, X22CrMoV12-1, 1.7709, and 300M. Each grade offers different combinations of strength, toughness, and corrosion resistance to suit specific engineering requirements.

Product Detail

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

Product Description

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Product Detail

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

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