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Nickel Based Alloy Bolt
QS Fastener: Nickel Based Alloy Bolt
Name: Nickel Based Alloy Bolt
Material: Nickel Based Alloy
Size: M6 to M100
Standard: ASME, EN, BSW, NF
Hardness: 150 to 200 HB
Length: 30 to 1000 mm
Application: For Ships, Nuclear Power, Chemical Industry, Vehicle Industry, Oil & Gas Industry
Feature: High Corrosion Resistance
Material: Nickel Based Alloy
Size: M6 to M100
Standard: ASME, EN, BSW, NF
Hardness: 150 to 200 HB
Length: 30 to 1000 mm
Application: For Ships, Nuclear Power, Chemical Industry, Vehicle Industry, Oil & Gas Industry
Feature: High Corrosion Resistance
Quantity
The Nickel Based Alloy Bolt is manufactured using high-performance nickel-based alloys, offering exceptional corrosion resistance and high strength. Available in sizes ranging from M6 to M100, it complies with international standards such as ASME and EN, with a hardness of 150 to 200 HB. Widely used in shipbuilding, nuclear power, chemical processing, automotive, and oil and gas industries, it is a high-performance fastener that ensures safety and reliability in extreme environments.
1. Welding Characteristics of Nickel-Based Alloys
The nickel-based alloys used in the Nickel Based Alloy Bolt (such as Inconel 718, Hastelloy C276, Monel 400, etc.) exhibit the following notable characteristics during welding:
The nickel-based alloys used in the Nickel Based Alloy Bolt (such as Inconel 718, Hastelloy C276, Monel 400, etc.) exhibit the following notable characteristics during welding:
Low Thermal Expansion Coefficient: The thermal expansion coefficient of nickel-based alloys is approximately 11.5-13.5 μm/m·K, significantly lower than that of stainless steel (17.3 μm/m·K) and carbon steel (12.0 μm/m·K). This helps reduce thermal stress during welding, minimizing the risk of weld cracking.
High Thermal Conductivity: The thermal conductivity of nickel-based alloys is about 11.4 W/m·K, enabling rapid heat dissipation during welding and reducing localized overheating. This minimizes the size and performance degradation of the heat-affected zone (HAZ).
Excellent Oxidation and Corrosion Resistance: Nickel-based alloys maintain a stable oxide layer even at high temperatures. The corrosion resistance of the weld area post-welding is comparable to that of the base material, making them particularly suitable for high-temperature and corrosive environments.
2. Welding Processes and Parameters
The Nickel Based Alloy Bolt can be welded using various processes, with the choice depending on the application and material thickness:
Tungsten Inert Gas Welding (TIG):
Suitable for thin sheets and precision welding.
The Nickel Based Alloy Bolt can be welded using various processes, with the choice depending on the application and material thickness:
Tungsten Inert Gas Welding (TIG):
Suitable for thin sheets and precision welding.
Welding current range: 50-200 A.
Shielding gas: Argon or helium (purity ≥99.99%).
Welding speed: 10-20 cm/min.
Weld strength can reach 90%-95% of the base material.
Shielding gas: Argon or helium (purity ≥99.99%).
Welding speed: 10-20 cm/min.
Weld strength can reach 90%-95% of the base material.
Metal Inert Gas Welding (MIG):
Suitable for medium-thickness plates.
Welding current range: 150-300 A.
Shielding gas: Argon (75%) + carbon dioxide (25%).
Welding speed: 15-30 cm/min.
Weld strength can reach 85%-90% of the base material.
Suitable for medium-thickness plates.
Welding current range: 150-300 A.
Shielding gas: Argon (75%) + carbon dioxide (25%).
Welding speed: 15-30 cm/min.
Weld strength can reach 85%-90% of the base material.
Laser Welding:
Suitable for high-precision and high-speed welding.
Power range: 1-10 kW.
Welding speed: 50-100 cm/min.
Weld strength can exceed 95% of the base material.
Suitable for high-precision and high-speed welding.
Power range: 1-10 kW.
Welding speed: 50-100 cm/min.
Weld strength can exceed 95% of the base material.
Electron Beam Welding:
Suitable for precision welding in high-vacuum environments.
Welding speed: 20-50 cm/min.
Weld strength can exceed 98% of the base material.
Suitable for precision welding in high-vacuum environments.
Welding speed: 20-50 cm/min.
Weld strength can exceed 98% of the base material.
3. Welding Performance Data
Heat-Affected Zone (HAZ): The HAZ of nickel-based alloys is typically controlled within 2-3 mm, significantly smaller than that of stainless steel (5-8 mm), reducing post-weld deformation and performance loss.
Heat-Affected Zone (HAZ): The HAZ of nickel-based alloys is typically controlled within 2-3 mm, significantly smaller than that of stainless steel (5-8 mm), reducing post-weld deformation and performance loss.
Weld Strength: The tensile strength of nickel-based alloy welds is usually 90%-98% of the base material. Specific values are as follows:
Inconel 718: Base material tensile strength is 1240 MPa, weld tensile strength is 1100-1200 MPa.
Hastelloy C276: Base material tensile strength is 690 MPa, weld tensile strength is 620-670 MPa.
Inconel 718: Base material tensile strength is 1240 MPa, weld tensile strength is 1100-1200 MPa.
Hastelloy C276: Base material tensile strength is 690 MPa, weld tensile strength is 620-670 MPa.
Fatigue Performance: Nickel-based alloy welds exhibit high fatigue strength, withstanding over 10^7 cycles under a cyclic stress of 500 MPa.
Corrosion Resistance: Post-welding, the corrosion rate of nickel-based alloy welds in strong acids (e.g., sulfuric acid, hydrochloric acid) and strong alkalis (e.g., sodium hydroxide) is less than 0.1 mm/year.
4. Application Examples in Complex Structures
Aerospace: In aircraft engines, the Nickel Based Alloy Bolt is used to connect high-temperature components such as turbine blades and combustion chambers. The high strength and heat resistance (withstanding temperatures above 650°C) of the welds ensure engine reliability and safety.
Aerospace: In aircraft engines, the Nickel Based Alloy Bolt is used to connect high-temperature components such as turbine blades and combustion chambers. The high strength and heat resistance (withstanding temperatures above 650°C) of the welds ensure engine reliability and safety.
Nuclear Power Equipment: In nuclear reactors, the Nickel Based Alloy Bolt is used to connect pressure vessels and pipelines. The corrosion resistance and radiation resistance of the welds ensure long-term stable operation in extreme environments.
Chemical Processing Equipment: In chemical reactors and heat exchangers, the Nickel Based Alloy Bolt is used to join dissimilar materials (e.g., stainless steel and carbon steel). The uniformity and corrosion resistance of the welds effectively prevent media leakage and equipment failure.
5. Welding Precautions
Pre-Weld Cleaning: The surface of nickel-based alloys must be thoroughly cleaned to remove oil, oxides, and other contaminants to ensure welding quality.
Pre-Weld Cleaning: The surface of nickel-based alloys must be thoroughly cleaned to remove oil, oxides, and other contaminants to ensure welding quality.
Preheating and Post-Weld Heat Treatment: For thick plates or high-stress components, preheating (150-250°C) and post-weld heat treatment (600-800°C) are recommended to eliminate welding stress and improve weld performance.
Filler Material Selection: Welding wires or rods should be selected from nickel-based alloys with compositions similar to the base material to ensure consistent chemical composition and performance of the weld.
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