What Is ASTM A516 Grade 70 NACE MR0175 HIC Resistant Steel Plate?

The ASTM A516 GR70 specification is a standard for carbon steel plates used in pressure vessels for moderate and low-temperature services. ASTM A516 Grade 70 HIC plates are manufactured under ASTM A516/A516M and additionally tested in accordance with NACE TM0284 for hydrogen-induced cracking resistance. When specified for sour service, they are generally supplied to meet the material requirements of NACE MR0175 / ISO 15156, this boiler quality steel plate is engineered to perform in harsh environments where resistance to hydrogen-induced damage is critical. These plates are widely used in industries such as oil and gas, petrochemical, and power generation.

Key Features of ASTM A516 GR70 NACE HIC

• Moderate-strength pressure vessel steel: The A516 Gr70 plate offers excellent tensile strength and toughness, making it ideal for pressure vessel applications.
• HIC tested according to NACE TM0284: Specifically tested for Hydrogen Induced Cracking, ensuring reliability in sour gas environments.
• NACE Compliance: Suitable for sour service applications in accordance with NACE MR0175 / ISO15156.
• Weldability: The low carbon content enhances weldability, allowing for easy fabrication and assembly.
• Versatile Thickness Range: Available in various thicknesses to suit diverse project requirements.

ASTM A516 Grade 70 NACE HIC Steel Plate Chemical Composition

ASTM A516 Grade 70 HIC steel plates are manufactured according to ASTM A516/A516M with stricter steelmaking practices for sour service applications. Compared with standard A516 Grade 70, HIC plates are typically produced by vacuum degassing and controlled sulfur/phosphorus levels to improve resistance to hydrogen-induced cracking.

Notes

• Chemical limits specified by ASTM A516 vary with plate thickness.
• HIC-resistant plates are usually produced using vacuum degassing, calcium treatment, and inclusion shape control.
• Low sulfur and phosphorus levels are essential for improving resistance to hydrogen-induced cracking.
• Actual chemistry may vary depending on purchaser requirements and steel mill practices.

ASTM A516 Grade 70 HIC Steel Plate Mechanical Properties

The mechanical properties of ASTM A516 Grade 70 HIC steel plates comply with ASTM A516/A516M while maintaining excellent toughness and weldability required for sour service pressure vessels.

Equivalent Grades

Applications of ASTM A516 GR70 NACE HIC Steel Plate

The A516 Gr70 plate is widely used in industries requiring robust materials for extreme conditions:

• Oil and Gas: For pipelines, storage tanks, and pressure vessels exposed to sour gas.
• Petrochemical: In reactors and heat exchangers where corrosion resistance is essential.
• Power Generation: For boilers and steam drums operating under high pressure.
• Chemical Processing: In equipment handling aggressive chemicals.

ASTM A516 Grade70 vs A516 Grade70 HIC

Why Choose GNEE steel for ASTM A516 GR70 NACE HIC Steel Plates?

At GNEE steel, we pride ourselves on delivering high-quality ASTM A516 pressure vessel steel tailored to your needs. Our advantages include:

• Quality Assurance: All plates undergo rigorous testing, including HIC and NACE compliance checks.
• Global Export: We supply A516 Gr70 plate to clients worldwide, ensuring timely delivery.
• Customization: Offering plates in various sizes and thicknesses to meet specific project requirements.
• Competitive Pricing: High-quality products at cost-effective rates.

6. Conclusion

The ASTM A516 GR70 NACE HIC steel plate is a reliable and versatile solution for industries requiring robust materials for pressure vessels and corrosive environments. With its excellent mechanical properties, HIC resistance, and NACE compliance, this boiler quality steel plate ensures safety and longevity in critical applications. Contact GNEE steel today to learn more about our high-quality A516 Gr70 plate and how we can meet your project needs.

For more details, explore our product page or reach out to our team for personalized assistance.

FAQ

1. What is ASTM A516 Grade 70 NACE HIC steel plate?

ASTM A516 Grade 70 NACE HIC steel plate is a pressure vessel carbon steel plate designed for sour service applications. It is manufactured according to ASTM A516/A516M and typically undergoes HIC testing in accordance with NACE TM0284 to resist hydrogen-induced cracking in wet H₂S environments.

2. What is the difference between ASTM A516 Grade 70 and A516 Grade 70 HIC?

Standard ASTM A516 Grade 70 is intended for general pressure vessel applications, while the HIC version is produced with cleaner steelmaking practices, lower sulfur content, vacuum degassing, and HIC testing for sour service conditions.

3. Is ASTM A516 Grade 70 HIC compliant with NACE MR0175?

The steel plate itself is manufactured to ASTM A516/A516M. When ordered for sour service, it can be supplied to meet the material requirements of NACE MR0175 / ISO 15156 together with HIC testing requirements specified by the purchaser.

4. What HIC test standard is used for ASTM A516 Grade 70 HIC plates?

The most commonly specified standard is NACE TM0284, which evaluates resistance to hydrogen-induced cracking under simulated wet H₂S conditions.

5. Can ASTM A516 Grade 70 HIC steel be welded?

Yes. Due to its relatively low carbon content and controlled carbon equivalent, ASTM A516 Grade 70 HIC offers excellent weldability. Proper welding procedures and post-weld heat treatment (PWHT), when required, help maintain HIC resistance.