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Custom High Temperature Fasteners from China Factory - High Strength Solutions for Extreme Temperatures by Trusted Suppliers Supplier, Product
Custom High Temperature Fasteners from China Factory - High Strength Solutions for Extreme Temperatures by Trusted Suppliers Supplier, Product
Custom High Temperature Fasteners from China Factory - High Strength Solutions for Extreme Temperatures by Trusted Suppliers Supplier, Product
Custom High Temperature Fasteners from China Factory - High Strength Solutions for Extreme Temperatures by Trusted Suppliers Supplier, Product
Custom High Temperature Fasteners from China Factory - High Strength Solutions for Extreme Temperatures by Trusted Suppliers Supplier, Product
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Custom High Temperature Fasteners from China Factory - High Strength Solutions for Extreme Temperatures by Trusted Suppliers Supplier, Product
Custom High Temperature Fasteners from China Factory - High Strength Solutions for Extreme Temperatures by Trusted Suppliers Supplier, Product
Custom High Temperature Fasteners from China Factory - High Strength Solutions for Extreme Temperatures by Trusted Suppliers Supplier, Product
Custom High Temperature Fasteners from China Factory - High Strength Solutions for Extreme Temperatures by Trusted Suppliers Supplier, Product
Custom High Temperature Fasteners from China Factory - High Strength Solutions for Extreme Temperatures by Trusted Suppliers Supplier, Product

Custom High Temperature Fasteners from China Factory - High Strength Solutions for Extreme Temperatures by Trusted Suppliers Supplier, Product

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Our high-temperature fasteners, designed for operating temperatures ranging from 400℃ to 1200℃, offer exceptional performance in demanding applications. While conventional stainless steel and alloy steel fasteners have an upper operating temperature limit of 400℃, exceeding this threshold significantly compromises their properties. As leading suppliers in China, our factory specializes in the production of high-temperature fasteners that meet rigorous standards, ensuring reliability in environments such as heat treatment equipment, steam turbines, engines, injection molding, and hot extrusion equipment. The manufacturing process involves advanced knowledge of thermal expansion coefficients, corrosion and rust resistance, mechanical properties under high temperatures, anti-loosening characteristics, and ease of disassembly. Trust our expertise as a trusted supplier to deliver high-quality fasteners tailored for your high-temperature needs.

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Product Description

Products Features

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. Below is an in-depth introduction to 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 (Rm): ≥ 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.

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:
  • ✈️ (1) Aerospace Field

    Aerospace engine: Turbine blade fasteners are manufactured using nickel-based high-temperature alloys (such as GH4049), maintaining a tensile strength of ≥ 1000 MPa at 600–900°C, processed through die forging technology.
    Spacecraft structure: Components connecting the combustion chamber of rocket engines must withstand instantaneous high temperatures (>1200°C) and vibration loads.

  • ⚡ (2) Energy and Power Industry

    Nuclear power plant: Reactor pressure vessel bolts must meet a lasting strength of ≥ 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).

  • 🏭 (3) Petroleum Chemical Industry and Marine Engineering

    Refining and processing unit: Bolts of the hydrogenation reactor are used long-term under high temperature and high pressure (400°C/20MPa), and the material must pass the hydrogen-induced delayed fracture test.

  • 🏗️ (4) Commercial Installation

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

  • 🚗 (5) 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 / B 564 / E112 450℃
2.4816 / UNS N06600 / Alloy600 NiCr15Fe ASTM B 166 450℃
2.4605 / UNS N06059 / Alloy59 NiCr23Mo16AI ASTM B574 / B 564 450℃
2.4610 / UNS N06455 / Alloy C4 NiMo16Cr16Ti ASTM B574 / B 564 400℃
2.4602 / UNS N06022 / Alloy C22 NiCr21Mo14W ASTM B574 / B 564 400℃
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)

Q What is 1.7709 steel and what are its key alloying elements?
1.7709 steel, also known as 21CrMoV5-7, is a high-performance alloy steel primarily composed of carbon (C: 0.17–0.25%), chromium (Cr: 1.20–1.50%), molybdenum (Mo: 0.65–0.80%), and vanadium (V: 0.25–0.35%), along with silicon and manganese. These elements work together to provide excellent strength, toughness, and heat resistance.
Q What is the maximum working temperature for 1.7709 (21CrMoV5-7) fasteners?
According to DIN EN 10269, 1.7709 steel fasteners can reliably withstand temperatures up to 550°C in continuous service. They also maintain acceptable mechanical properties at temperatures down to 400°C, making them suitable for a wide range of elevated-temperature applications.
Q What industries commonly use high-temperature high-strength fasteners?
High-temperature high-strength fasteners are widely used across several critical industries, including aerospace (turbine engines, spacecraft), energy and power (nuclear reactors, gas turbines), petroleum and chemical processing (hydrogenation reactors), mold manufacturing, as well as automotive and rail transit applications such as new energy vehicle motors.
Q Which materials are suitable for fasteners operating above 1000°C?
For applications exceeding 1000°C, nickel-based alloys are the preferred choice. Materials such as 2.4851 (NiCr23Fe / Alloy 601), 2.4633 (NiCr25FeALY / Alloy 602), and 2.4889 (NiCr28FeSiCe) can withstand temperatures up to 1170–1200°C. These alloys comply with standards such as DIN EN10095 and ASTM B166.
Q What executive standards govern high-temperature fastener materials?
High-temperature fastener materials are governed by a range of international standards depending on the material type and application. Common standards include DIN EN 10269, DIN EN 10095, ASTM B166, ASTM B637, ASTM B408, EN10302, and SEW470. Each standard specifies chemical composition, mechanical properties, and testing requirements for the respective alloy grades.
Q How do I select the right high-temperature fastener material for my application?
Material selection depends on several key factors: the maximum operating temperature, required mechanical strength (yield and tensile strength), environmental conditions (corrosion, oxidation, hydrogen exposure), applicable industry standards, and cost constraints. For temperatures up to 550°C, alloy steels like 1.7709 or 1.7711 are cost-effective. For higher temperatures or more aggressive environments, nickel-based superalloys such as Alloy 718 or Alloy 601 are recommended. Consulting the material's executive standard and conducting relevant performance tests is strongly advised.

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