API TR 21C Evaluating Metallic Material Performance in High-pressure Hydrogen Gas, First Edition

About this publication

The API TR 21C Evaluating Metallic Material Performance in High-pressure Hydrogen Gas, First Edition is a focused technical reference for materials engineers, integrity specialists, hydrogen infrastructure professionals, asset owners, researchers, consultants, and oil and gas personnel who need guidance on metallic material performance in high-pressure hydrogen environments. Current listings identify this publication as an API technical report, first published on July 1, 2025, under product code G21C01.

What makes API TR 21C especially valuable is its relevance to one of the most important emerging challenges in hydrogen service: understanding how metallic materials behave when exposed to high-pressure H2 gas. Current product descriptions state that understanding fracture behavior in these environments can help with the selection of materials for underground hydrogen storage, and they note that there is currently sparse fracture-mechanics data for metallic materials typically used in oil and gas well construction when subjected to high-pressure hydrogen gas.

This report is not positioned as a broad general-purpose hydrogen handbook. Its value comes from being more targeted and more technical. The description for this publication states that the test program documented in the report is intended to generate data and provide insight into testing procedures and material behavior, with the longer-term goal of helping industry evaluate and select materials for this type of service. That makes it especially useful for professionals involved in hydrogen storage planning, well construction materials review, technical qualification work, and integrity decision-making for assets that may operate in demanding hydrogen conditions.

Because hydrogen service can introduce material-performance concerns that are not always well addressed by conventional oil and gas experience alone, a report like API TR 21C is especially attractive for serious technical buyers. It supports organizations that need a stronger understanding of fracture-performance behavior, material screening, and the developing technical basis for using metallic materials in high-pressure hydrogen gas service. For buyers building a hydrogen-focused engineering library, this is the kind of specialized publication that adds real value beyond broader design or code references.

At 48 pages, this is a concise but highly specialized technical report. Its shorter length makes it approachable for focused technical review while still giving buyers access to an API publication centered on a fast-growing area of hydrogen-related materials evaluation. Current listings show the publication with 48 pages and product code G21C01.

Why This Report Matters

The API TR 21C Evaluating Metallic Material Performance in High-pressure Hydrogen Gas, First Edition is a strong choice for buyers who need focused technical guidance on metallic materials in hydrogen service. It is especially well suited for:

• Materials and metallurgy engineers

• Hydrogen storage and infrastructure professionals

• Integrity and reliability specialists

• Oil and gas well construction personnel

• Technical consultants and researchers

• Engineering and hydrogen-technology libraries

Product Features

• Official API TR 21C technical report

• First Edition

• Focused on metallic material performance in high-pressure hydrogen gas

• Relevant to fracture behavior, testing procedures, and material evaluation in hydrogen environments

• Useful for underground hydrogen storage and related materials-selection work

• Valuable for engineers, researchers, consultants, and integrity professionals

• Compact 48-page technical reference

Product Details

• Title: API TR 21C Evaluating Metallic Material Performance in High-pressure Hydrogen Gas, First Edition

• Publisher: American Petroleum Institute

• Edition: 1st

• Published: July 1, 2025

• Number of Pages: 48

• Product Code: G21C01