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Custom High-Temperature Fasteners from China Suppliers - High Strength Fasteners for 400℃ to 1200℃ Applications Exporters, Product
Custom High-Temperature Fasteners from China Suppliers - High Strength Fasteners for 400℃ to 1200℃ Applications Exporters, Product
Custom High-Temperature Fasteners from China Suppliers - High Strength Fasteners for 400℃ to 1200℃ Applications Exporters, Product
Custom High-Temperature Fasteners from China Suppliers - High Strength Fasteners for 400℃ to 1200℃ Applications Exporters, Product
Custom High-Temperature Fasteners from China Suppliers - High Strength Fasteners for 400℃ to 1200℃ Applications Exporters, Product
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Custom High-Temperature Fasteners from China Suppliers - High Strength Fasteners for 400℃ to 1200℃ Applications Exporters, Product
Custom High-Temperature Fasteners from China Suppliers - High Strength Fasteners for 400℃ to 1200℃ Applications Exporters, Product
Custom High-Temperature Fasteners from China Suppliers - High Strength Fasteners for 400℃ to 1200℃ Applications Exporters, Product
Custom High-Temperature Fasteners from China Suppliers - High Strength Fasteners for 400℃ to 1200℃ Applications Exporters, Product
Custom High-Temperature Fasteners from China Suppliers - High Strength Fasteners for 400℃ to 1200℃ Applications Exporters, Product

Custom High-Temperature Fasteners from China Suppliers - High Strength Fasteners for 400℃ to 1200℃ Applications Exporters, Product

Our factory specializes in high-temperature fasteners designed for optimal performance in extreme conditions. While conventional stainless steel and alloy steel fasteners have an upper operating temperature limit of 400℃, our high-temperature fasteners are engineered to perform reliably at temperatures ranging from 400℃ to 1200℃. As a trusted supplier in China, we understand that the production of high-temperature fasteners involves a meticulous process that considers expansion coefficients, anti-corrosion and anti-rust properties, mechanical performance at elevated temperatures, anti-loosening features, and ease of disassembly. Our fasteners are ideal for use in various applications, including heat treatment equipment, steam turbines, engines, injection molding, and hot extrusion machinery. Choose our high-quality high-temperature fasteners for durable and efficient solutions tailored to your industrial needs.

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Product Description

Products Features

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, 1.7709 steel has high strength and good mechanical properties. Yield strength (Rp0.2) ≥ 550 MPa, tensile strength (PM) ≥ 700 MPa, elongation (A) ≥ 16%, and 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.

Application

High-temperature high-strength fasteners (H-T H-S Fasteners) need to simultaneously meet requirements such as high-temperature strength, anti-rust property and corrosion resistance in extreme environments. Their core application fields are as follows:

  • 01✈️ Aerospace Field

    Aerospace engine: Turbine blade fasteners manufactured using nickel-based high-temperature alloys (such as GH4049), maintaining tensile strength ≥ 1000 MPa at 600–900℃, processed through die forging technology.

    Spacecraft structure: Components connecting the combustion chamber of rocket engines must withstand instantaneous high temperatures (>1200℃) and vibration loads.

  • 02⚡ Energy and Power Industry

    Nuclear power plant: Reactor pressure vessel bolts must meet a lasting strength ≥ 95 MPa (at 700°C/100,000 hours), preventing hydrogen embrittlement and stress corrosion cracking.

    Gas turbine: High-temperature bolts (such as A286 alloy) fix turbine discs and must undergo creep limit tests (1% total deformation/1000 hours).

  • 03🏭 Petroleum Chemical Industry & Marine Engineering

    Refining and processing unit: Hydrogenation reactor bolts must be used long-term under high temperature and high pressure (400℃/20MPa), and the material must pass the hydrogen-induced delayed fracture test.

  • 04🏗️ Commercial Installation

    Mold manufacturing: Fastening components of composite material molds need to match a low thermal expansion coefficient (CTE ≤ 10⁻⁶/℃) to maintain dimensional stability.

  • 05🚗 Automobiles and Rail Transit

    New energy vehicles: Motor shaft bolts made of titanium alloy (such as TC4), with tensile strength up to 900 MPa and no magnetic interference. The tapping process needs to be optimized to reduce work hardening.

The Following Is the Main Types of High Temperature Fasteners

High Temperature Fasteners Available Types
Digital Grade Material Executive Standard Withstand Temperature
2.4851 / UNS N06601 / Alloy601 NiCr23Fe DIN17742 / EN10095 / ASTM B166 1200℃
2.4633 / UNS N06025 / Alloy602 NiCr25FeALY DIN EN 10302 / ASTM B166 1200℃
2.4851 NiCr23Fe DIN EN10095 1200℃
2.4889 NiCr28FeSiCe DIN EN10095 1170℃
1.4854 X6NiCrSiNCe35-25 DIN EN10095 1170℃
1.4762 X10CrAISi25 DIN EN10095 1150℃
2.4816 / UNS N06600 / Alloy600 NiCr15Fe DIN17742 / EN10095 / ASTM B166 1150℃
1.4841 / AISI310S / AISI314 X15CrNiSi25-21 EN10095 / SEW470 1150℃
1.4762 / SICRO12 X10CrAISi25 EN10095 / SEW470 1150℃
2.4665 / UNS N06002 / Alloy X NiCr19NbMo ASTM B572 1100℃
2.4663 / UNS N06617 / Alloy617 NiCr23Co12Mo ASTM B166 1100℃
1.4864 / Alloy330 X12NiCrSi36-16 EN10095 / SEW470 1100℃
1.4835 / Alloy253 MA X9CrNiSiNCe21-11-2 EN10095 1100℃
1.4835 X9CrNiSiNCe21-11-2 DIN EN10095 1100℃
1.4877 X6NiCrNbCe32-27 DIN EN10095 1100℃
1.4872 X25CrMnNiN25-9-7 DIN EN10095 1100℃
1.4841 X15CrNiSi25-21 DIN EN10095 1100℃
2.4816 NiCr15Fe DIN EN10095 1100℃
1.4749 X18CrN28 DIN EN10095 1100℃
1.4845 / AISI310 / AISI3105 X8CrNi25-21 EN10095 / SEW470 / ASTM A276 1050℃
1.4864 X12NiCrSi35-16 DIN EN10095 1050℃
1.4886 X10NiCrSi35-19 DIN EN10095 1050℃
1.4887 X10NiCrSiNb35-22 DIN EN10095 1050℃
1.4821 X15CrNiSi25-4 DIN EN10095 1050℃
1.4876 X10NiCrAITi32-21 DIN EN10095 1050℃
1.4818 X6CrNiSiNCe19-10 DIN EN10095 1050℃
1.4845 X8CrNi25-21 DIN EN10095 1000℃
1.4742 X10CrAISi18 DIN EN10095 1000℃
1.4828 / AISI3095 X15CrNiSi20-12 EN10095 / SEW470 / ASTM A276 1000℃
1.4742 / SICRO 10 X10CrAISi18 EN10095 / SEW470 1000℃
2.4634 / UNS N13021 / Alloy 105 NiCo20Cr15MoAITi ASTM B637 950℃
1.4876H / Alloy800H X10NiCrAITi32-20H ASTM B408 950℃
2.4969 / UNS N07090 / Alloy90 NiCr20Co18Ti DIN EN10302 / BS 2HR2 920℃
1.4876HT / Alloy 800HT X10NiCrAITi32-20HT ASTM B408 900℃
1.4878 / AISI 321H X8CrNiTi18-10 EN10095 / SEW470 850℃
1.4724 / SICRO 9 X10CrAISi13 EN10095 / SEW470 850℃
1.4736 X3CrAITi18-2 DIN EN10095 850℃
1.4828 X15CrNiSi20-12 DIN EN10095 850℃
1.4833 X12CrNi23-13 DIN EN10095 850℃
2.4856 NiCr22Mo9Nb DIN EN10095 850℃
1.4724 X10CrAISi13 DIN EN10095 850℃
1.4878 X8CrNiTi18-10 DIN EN10095 800℃
1.4713 X10CrAISi7 DIN EN10095 800℃
2.4952 / UNS N07080 / Alloy 80A NiCr20TiAI DIN EN10269 / ASTM B 637 800℃
1.4713 / SICRO 8 X10CrAISi7 EN10095 / SEW470 800℃
1.4981 X8CrNiMoNb16-16 — 750℃
2.4668 / UNS N07718 / Alloy 718 NiCr19Fe19Nb5Mo3 DIN EN 10269 / ASTM B637 700℃
1.4986wk X7CrNiMoBNb16-16 DIN EN 10269/2 670℃
1.4980 / Alloy268 / 660A/B/C/D X6NiCrTiMoVB25-15-2 DIN EN10269 / ASTM 453 650℃
2.4669 NiCr15Fe7TiAI — 650℃
2.4952 NiCr20TiAI — 600℃
1.4980 X6NiCrTiMoVB25-15-2 — 600℃
1.4982 X10CrNiMoMnNbVB15-10-1 — 600℃
1.4986 X7CrNiMoBNb16-16 DIN EN 10269 600℃
1.7233 42CrMo5-6 — 600℃
1.4923 X22CrMoV12-1 DIN EN 10269 600℃
1.4913 X19CrMoNbVN11-1 DIN EN 10269 600℃
1.7711 40CrMoV4-6 DIN EN 10269 550℃
1.7709 21CrMoV5-7 DIN EN 10269 550℃
1.7218 25CrMo4 DIN EN 10269 550℃
1.4562 / UNS N08031 / Alloy31 X1NiCrMoCu32-28-7 ASTM B581 / B649 550℃
1.7711 40CrMoV4-6 DIN EN 10269 550℃
1.4913 X19CrMoNbVN11-1 DIN EN 10269 550℃
1.4948 X6CrNi18-10 — 550℃
1.4429 X2CrNiMoN17-13-3 — 550℃
1.4401 X5CrNiMo17-12-2 — 500℃
1.4404 X2CrNiMo17-12-2 — 500℃
1.4303 X4CrNi18-12 DIN EN10269 500℃
1.4301 X4CrNi18-10 — 500℃
1.4307 X2CrNi18-9 — 500℃
1.7729 20CrMoVTiB4-10 — 500℃
1.7729 20CrMoVTiB4-10 DIN EN 10269 500℃
1.7225 42CrMO4 DIN EN 10269 500℃
2.4858 / UNS N08825 / Alloy825 NiCr21Mo DIN17744 / 17752 / ASTM B425 450℃
2.4856 / UNS N06625 / Alloy625 NiCr22Mo9Nb ASTM B446 / B564 / E112 450℃
2.4816 / UNS N06600 / Alloy600 NiCr15Fe ASTM B 166 450℃
2.4605 / UNS N06059 / Alloy59 NiCr23Mo16AI ASTM B574 / B564 450℃
2.4610 / UNS N06455 / Alloy C4 NiMo16Cr16Ti ASTM B574 / B564 400℃
2.4602 / UNS N06022 / Alloy C22 NiCr21Mo14W ASTM B574 / B564 400℃
1.4571 / AISI 316Ti X6CrNiMoTi17-12-2 DIN EN 10088-3 / 10272 400℃
1.4541 / AISI 321 X6CrNiTi18-10 DIN EN 10088-3 / 10272 400℃
1.4539 / AISI 904L X1NiCrMoCu25-20-5 DIN EN 10088-3 / 10272 400℃
1.4529 / Alloy926 X1NiCrMoCu25-20-7 DIN EN 10088-3 / 10272 400℃
1.4429 / AISI 316LN X2CrNiMoN17-13-3 DIN EN 10269 / 10272 400℃
1.4404 / AISI 316L X2CrNiMo17-12-2 DIN EN 10269 / 10272 400℃
1.4923 X22CrMoV12-1 DIN EN 10269 400℃
1.7225 42CrMo4 DIN EN 10269 400℃
1.7709 21CrMoV5-7 DIN EN 10269 400℃
1.7258 24CrMo5 — 400℃
1.7219 26CrMo4 — 400℃
1.7218 25CrMo4 DIN EN 10269 400℃
1.4571 X6CrNiMoTi17-12-2 — 400℃
1.739 X15CrMo5-1 — 400℃
1.1133 20Mn5 — 400℃

Frequently Asked Questions (FAQ)

QWhat is 1.7709 steel (21CrMoV5-7) and what makes it suitable for high-temperature fasteners?
1.7709 steel, also known as 21CrMoV5-7, is a high-performance chromium-molybdenum-vanadium alloy steel. Its carefully balanced chemical composition — including Cr (1.20–1.50%), Mo (0.65–0.80%), and V (0.25–0.35%) — provides excellent strength, toughness, and heat resistance. It maintains reliable mechanical performance at temperatures up to 550°C, making it ideal for high-temperature bolts, studs, and nuts in power generation and industrial equipment.
QWhat are the key mechanical properties of 1.7709 (21CrMoV5-7) in the heat-treated state?
In the heat-treated condition, 1.7709 steel delivers a yield strength (Rp0.2) ≥ 550 MPa, tensile strength (PM) ≥ 700 MPa, elongation (A) ≥ 16%, and reduction of area ≥ 60%. These properties ensure the material can withstand high mechanical loads without brittle failure, even in demanding thermal environments.
QWhich industries commonly use high-temperature high-strength fasteners?
High-temperature high-strength fasteners are widely used across multiple industries including aerospace (turbine blades, rocket combustion chambers), energy and power (nuclear reactors, gas turbines), petroleum and chemical processing (hydrogenation reactors), commercial mold manufacturing, and automotive/rail transit (new energy vehicle motor shafts). Each application demands specific combinations of temperature resistance, corrosion resistance, and mechanical strength.
QWhat is the maximum withstand temperature for the high-temperature fastener materials listed?
The highest temperature-rated materials in the available types list are grades 2.4851 (NiCr23Fe / Alloy601) and 2.4633 (NiCr25FeALY / Alloy602), both capable of withstanding up to 1200°C. These nickel-chromium alloys are typically used in the most extreme thermal environments such as furnace components, aerospace combustion chambers, and industrial heat treatment equipment.
QWhat executive standards are used for high-temperature fastener materials?
High-temperature fastener materials comply with a range of international standards depending on the grade and application. Common standards include DIN EN 10269 (European standard for fastener steels at elevated temperatures), DIN EN 10095 (heat-resistant steels), ASTM B166 / B408 / B637 (American standards for nickel alloy bars and wire), and SEW470 (German standard for heat-resistant steels). Compliance with these standards ensures consistent quality, traceability, and performance reliability.
QHow do I select the right high-temperature fastener material for my application?
Selecting the correct material requires evaluating several factors: (1) the maximum operating temperature, (2) mechanical load requirements (tensile strength, yield strength), (3) environmental conditions such as corrosive media, pressure, or hydrogen exposure, and (4) applicable industry standards. For example, for applications up to 550°C, 1.7709 (21CrMoV5-7) is a cost-effective choice; for temperatures above 1000°C, nickel-based alloys such as Alloy601 or Alloy617 are recommended. Selecting the correct material requires evaluating these parameters to ensure reliable service.

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