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Custom High Strength Alloy Fasteners from China - Ultra-High Strength and High Temperature Resistant Supplier & Factory Exporter, Products
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Custom High Strength Alloy Fasteners from China - Ultra-High Strength and High Temperature Resistant Supplier & Factory Exporter, Products
High Strength Alloy Fasteners are engineered by incorporating silicon and manganese into steel, ensuring optimal performance and durability. Our products are manufactured in China, leveraging advanced technologies and high-quality materials. Common material grades for these high-strength fasteners include 40CrNiMoA, 30CrMnSiA, 21CrMoV5-7, 1.6772, 20Cr1Mo1VTiB, X22CrMoV12-2, 1.7709, and 300M. As a leading supplier in the industry, our factory is dedicated to providing top-notch alloy steel fasteners that meet rigorous standards and exceed customer expectations
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:
Tensile Strength
1900–2100 MPa
Yield Strength
> 1600 MPa
▶ (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 IndustryLanding Gear 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.
Missiles & Engines 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 IndustryDeep-Sea 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 InfrastructureBridges & Tunnels Martensitic stainless steel is used for high-strength fasteners to enhance durability.
(4) Emerging Technology Fields3D Printing 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
1
What is 1.7709 steel and what is its common application?
1.7709 steel, also known as 21CrMoV5-7, is a high-performance alloy steel widely used in the manufacturing of high-strength, high-temperature-resistant fasteners such as bolts and nuts. Its combination of chromium, molybdenum, and vanadium gives it excellent mechanical properties and heat resistance, making it ideal for demanding industrial environments.
2
What is the maximum operating temperature for 1.7709 material?
1.7709 material can maintain good mechanical properties in high-temperature environments and is suitable for working conditions with temperatures exceeding 300°C. This makes it a preferred choice for applications in power generation, petrochemical, and other high-temperature industrial sectors.
3
How does 300M steel differ from standard alloy steels?
300M is a medium-carbon nickel-chromium-molybdenum alloy steel with ultra-high strength, achieving tensile strength of 1900–2100 MPa and yield strength over 1600 MPa. Unlike standard alloy steels, 300M also offers excellent fatigue performance and toughness, making it specifically suited for aerospace and defense applications such as aircraft landing gear components.
4
Which industries commonly use high-strength alloy stainless steel?
High-strength alloy stainless steel is used across a wide range of industries, including aerospace and defense (landing gear, missile components), ocean engineering and petrochemicals (submarine pipelines, chemical reactors), architecture and infrastructure (bridges, tunnels), and emerging technology fields such as 3D printing and additive manufacturing.
5
What are the key mechanical properties of 1.7709 steel?
In its heat-treated state, 1.7709 steel exhibits a yield strength (Rp0.2) of ≥550 MPa, tensile strength of ≥700 MPa, elongation of ≥16%, and reduction of area of ≥60%. These properties make it highly suitable for structural and mechanical fastener applications requiring both strength and ductility.
6
What high-strength stainless steel grades are available?
Available grades include 40CrNiMoA, 30CrMnSiA, 21CrMoV5-7, 1.6772, 20Cr1Mo1VTiB, X22CrMoV12-1, 1.7709, and 300M. Each grade offers distinct mechanical and chemical properties, allowing selection based on specific application requirements such as load capacity, temperature resistance, and corrosion resistance.
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