718 API 6ACRA (NACE)
Superior Corrosion-Resistant Alloy from Premium Alloys
Get a Quote for AMS 5662
718 API 6ACRA (NACE) is a high-performance alloy designed to withstand severe corrosive environments and high mechanical stress, especially in oil and gas applications. At Premium Alloys, we supply 718 API 6ACRA (NACE) to meet the demanding requirements of offshore and onshore drilling, wellhead equipment, and subsea applications. Our commitment to quality and responsive service ensures that your projects benefit from reliable, corrosion-resistant materials.
Premium Alloy’s Expertise in 718 API 6ACRA (NACE) Alloy Solutions
718 API 6ACRA (NACE) is engineered for environments where high resistance to corrosion, particularly in sour gas and chloride conditions, is essential. As a Houston-based distributor serving a wide range of industries, Premium Alloys provides 718 API 6ACRA (NACE) alloy solutions backed by technical expertise and customized services to meet industry-specific demands. Our team can advise on optimal material selection, specifications, and processing to support critical projects.
What is 718 API 6ACRA (NACE)?
718 API 6ACRA (NACE) – a component of Inconel 718 – is a specification for a high-strength, corrosion-resistant alloy specifically developed for the oil and gas industry. 718 API 6ACRA (NACE) meets NACE standards for sulfide stress cracking resistance, making it suitable for sour gas environments where standard alloys might fail. Known for its excellent mechanical properties and corrosion resistance, 718 API 6ACRA (NACE) is widely used in environments exposed to seawater, chlorides, and hydrogen sulfide (H₂S).
Key Benefits of API 6ACRA (NACE)
- Superior Corrosion Resistance: Withstands harsh, chloride-rich environments and exposure to H₂S.
- High Mechanical Strength: Retains structural integrity under high stress.
- Sulfide Stress Cracking Resistance: Compliant with NACE MR0175 / ISO 15156 for sour service environments.
- Thermal Stability: Performs reliably across a wide range of temperatures.
Chemical Composition of 718 API 6ACRA (NACE)
The strength and corrosion resistance of 718 API 6ACRA (NACE) come from its precise alloy composition, which is designed to perform in sour service and other challenging environments.
Nickel Ni
50.0 – 55.0 Range
Iron Fe
Balance
Molybdenum Mo
2.80 – 3.30 Range
Aluminum Al
0.40 – 0.60 Range
Cobalt Co
1.00 Max
Silicon Si
0.35 Max
Sulfur S
0.010 Max
Copper Cu
0.23 Max
Selenium Se
0.0005 (5 ppm) Max
Calcium* Ca
0.0030 (30 ppm) Max
Chromium Cr
17.0 – 21.0 Range
Magnesium* Mg
0.0060 (60 ppm) Max
Titanium Ti
0.80 – 1.15 Range
Carbon C
0.045 Max
Manganese Mn
0.35 Max
Phosphorus P
0.010 Max
Boron B
0.0060 (60 ppm) Max
Lead Pb
0.0010 (10 ppm) Max
Bismuth Bi
0.00005 (0.5 ppm) Max
Columbium (Niobium) + Tantalum Cb (Nb) + Ta
4.87 – 5.20 Range
This balanced composition enhances resistance to pitting, crevice corrosion, and stress-corrosion cracking, making API 6ACRA ideal for oilfield applications.
Mechanical Properties of 718 API 6ACRA (NACE)
718 API 6ACRA (NACE) is engineered for strength, durability, and resistance to extreme environments:
- 0.2% Yield Strength, Min. ksi (MPa) 120 – 145 (827 – 1000)
- Tensile Strength, Min. ksi (MPa) 150 (1034)
- Elongation in 4D Min. % 20
- Reduction of Area, Min %
- For QTC thickness ≤ 10 in. (254 mm) 35
- For QTC thickness > 10 in. (254 mm) 25
- Hardness, HRC (HBW) 32 – 40 (298 – 363)
These mechanical properties make 718 API 6ACRA a valuable material for high-stress, high-corrosion environments commonly found in offshore drilling and wellhead equipment.
Processing and Heat Treatment for 718 API 6ACRA (NACE)
718 API 6ACRA (NACE) is optimized through careful processing and heat treatment to achieve the mechanical and corrosion-resistant properties required for harsh environments. The material undergoes controlled heat treatment processes to enhance its microstructure and durability.
Typical Heat Treatment Process
- Solution Treatment: Heated to 1870-1925°F (1021.1-1051.7°C), followed by rapid quenching.
- Stress Relief Treatment: Commonly applied to reduce residual stress and improve performance in sulfide stress environments.
The specific heat treatment ensures that 718 API 6ACRA (NACE) performs well in both high-pressure and high-temperature applications.
Industries and Applications for 718 API 6ACRA (NACE)
718 API 6ACRA (NACE) is an indispensable alloy in the oil and gas industry, particularly for applications where corrosion resistance and mechanical strength are critical. Here’s how 718 API 6ACRA (NACE) is used across key sectors and how Premium Alloys supports these applications.
Oil and Gas Exploration and Production
718 API 6ACRA (NACE) is widely used in oil and gas applications where exposure to sour gas and other corrosive elements is common.
- Applications: Wellhead components, downhole tubulars, subsea valves, heat exchanger tubing, and control lines.
- How Premium Alloys Supports Oil & Gas: With our custom cutting services and extensive inventory, we meet the specific demands of oil and gas equipment manufacturers, providing materials that comply with NACE MR0175 / ISO 15156.
Offshore Drilling and Production Platforms
In offshore drilling, 718 API 6ACRA’s (NACE) resistance to seawater and chloride stress makes it a crucial material.
- Applications: Platform piping, seawater handling systems, pumps, and pressure control valves.
- How Premium Alloys Serves Offshore Needs: Our inventory and just-in-time delivery capabilities ensure that offshore drilling and production operations have the materials they need, when they need them, to avoid costly downtime.
Refineries and Chemical Processing
In chemical processing plants and refineries, 718 API 6ACRA’s (NACE) chemical resistance extends equipment life and reliability.
- Applications: Chemical storage tanks, transfer piping, heat exchangers, and corrosive media handling systems.
- How Premium Alloys Supports Refineries: We provide certified 718 API 6ACRA (NACE) that meets stringent quality and compliance requirements, ensuring that materials are corrosion-resistant and durable under demanding chemical conditions.
Power Generation
718 API 6ACRA (NACE) is also used in power generation where corrosion resistance is essential for maintaining efficiency and safety.
- Applications: Cooling systems, pressure valves, steam generation units, and exhaust handling components.
- How Premium Alloys Serves Power Gen: Our technical team offers material selection guidance and traceable documentation for regulatory compliance, supporting the critical infrastructure of power plants.
The Unique Advantages of 718 API 6ACRA (NACE)
718 API 6ACRA (NACE) offers several critical advantages that make it indispensable for high-corrosion environments and high-stress applications.
- Chloride Resistance: Exceptional resistance to pitting and crevice corrosion in chloride environments.
- Sulfide Stress Cracking Resistance: Complies with NACE MR0175 / ISO 15156, making it reliable for sour service.
- Thermal Stability and Strength: Retains strength and stability in high-temperature applications, reducing the risk of deformation.
- Versatility in Processing: 718 API 6ACRA (NACE) is compatible with various fabrication methods, including welding, bending, and machining.
Premium Alloys sources API 6ACRA only from trusted mills and provides full traceability, ensuring consistent quality and reliable performance in each batch.
Key Takeaways
Exceptional Corrosion Resistance
718 API 6ACRA (NACE) is optimized for use in chloride and sour gas environments, where corrosion resistance is critical.
Compliance with Industry Standards:
Meets NACE MR0175 / ISO 15156, making it suitable for sour service applications.
Processing Flexibility
Easily fabricated for a variety of applications, from wellhead components to offshore platforms.
Premium Alloys’ Quality Assurance
We deliver 718 API 6ACRA (NACE) materials with full traceability, ensuring consistent quality for demanding applications.
Take the Next Step with Premium Alloys
If you’re working on challenging projects in oil and gas, offshore drilling, or chemical processing, Premium Alloys is ready to support you with 718 API 6ACRA (NACE). Contact our team for expert advice, tailored recommendations, and reliable service to help ensure your project’s success.
Frequently Asked Questions about 718 API 6ACRA (NACE)
718 API 6ACRA (NACE) is a high-strength alloy that meets NACE MR0175 / ISO 15156 standards for resistance to sulfide stress cracking. It is specifically engineered for use in sour gas and chloride-rich environments, providing superior corrosion resistance and mechanical strength compared to standard alloys.
718 API 6ACRA (NACE) is used extensively in oil and gas for applications like wellhead components, subsea valves, control lines, and downhole tubulars due to its resistance to sulfide stress cracking and chloride-induced corrosion.
718 API 6ACRA (NACE) resists chloride stress corrosion, a common issue in seawater environments, and has high strength and thermal stability. This makes it suitable for offshore platforms exposed to harsh marine conditions and high mechanical stress.
API 6ACRA (NACE) is compliant with NACE standards, providing enhanced resistance to sulfide stress cracking compared to many other alloys. Its unique composition also gives it an edge in handling chloride exposure, common in sour gas and seawater environments.
Premium Alloys supplies 718 API 6ACRA (NACE) with complete traceability and documentation, including NACE compliance certification, mill test reports, and detailed chemical composition data to ensure regulatory compliance and quality assurance.
