What is ASME SA387GR.91 HIC NACE equivalent to？

What is ASME SA387GR.91 HIC NACE equivalent to?

At Gangsteel, we manufacture and supply ASME SA387 Grade 91 HIC NACE steel plates (also referred to as SA387GR91 HIC or SA387 Gr.91 HIC NACE). This is a modified 9Cr-1Mo-V-Nb alloy steel specifically processed for high-temperature service combined with excellent resistance to Hydrogen Induced Cracking (HIC) and compliance with sour service requirements.

Equivalent Grades of ASME SA387 Grade 91 HIC NACE

Here are the most recognized equivalents:

Key Information from Gangsteel

ASME SA387 Grade 91 HIC NACE 

is based on the standard ASME SA387 / ASTM A387 Grade 91 Class 2, but with additional stringent controls:

• Ultra-low sulfur and phosphorus levels
• Inclusion shape control
• Special melting and heat treatment practices
• 100% HIC testing per NACE TM0284
• Full compliance with NACE MR0175 / ISO 15156 for sour (wet H₂S) service

This combination makes it suitable for supercritical boilers, high-temperature steam pipes, headers, and pressure vessels in both high-temperature and hydrogen-rich environments.

Gangsteel’s Supply CapabilityWe can provide SA387GR91 HIC NACE plates with:

• Thickness range: 6mm – 150mm
• Full EN 10204 3.1 / 3.2 certification
• HIC test reports (CLR, CTR, CSR)
• Ultrasonic testing (UT) and mechanical testing

If you are looking for material equivalent to K90901 or 10CrMoVNb9-1 with HIC + NACE requirements, Gangsteel is your reliable source.

Would you like a formal quotation, detailed technical data sheet, or mill test certificate sample for ASME SA387 Grade 91 HIC NACE? Feel free to contact us — we usually reply within 12 hours.