📦 Resource excel

ASTM G48 Test Report Template (Excel + Auto-Calculating PREN/CPT Fields)

The ASTM G48 Test Report Template is an Excel-based engineering resource designed to document and evaluate the resistance of corrosion-resistant alloys (CRAs) to pitting and crevice corrosion using standardized laboratory test methods defined in ASTM G48. It incorporates auto-calculating fields for Pitting Resistance Equivalent Number (PREN) and Critical Pitting Temperature (CPT) to support rapid, consistent, and traceable material qualification. The template ensures compliance with ASTM G48–22 (or latest revision) while enabling real-time data validation and reporting for materials selection in aggressive chloride environments.

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📖 Overview

ASTM G48 is a widely adopted standard test method for evaluating the localized corrosion resistance of stainless steels and nickel-based alloys via ferric chloride immersion testing under controlled temperature and time conditions. The Excel-based template streamlines execution of Tests A (pitting), B (crevice), and C (combined pitting/crevice), capturing specimen details, test parameters (e.g., temperature, duration, solution concentration), visual/microscopic inspection results, and pass/fail determinations per ASTM acceptance criteria. Central to the template’s utility are its embedded, formula-driven calculations: PREN is computed from alloy composition (Cr, Mo, N, W) to rank inherent pitting resistance, while CPT estimation—often derived empirically or via regression models calibrated against experimental G48 data—provides a predictive threshold temperature for onset of pitting. The template supports version-controlled documentation, audit readiness, and integration into broader Materials Data Management Systems (MDMS), making it indispensable for oil & gas, offshore, chemical processing, and desalination projects where CRA performance directly impacts asset integrity and lifecycle cost.

📑 Key Components

1 ASTM G48 Test Configuration Table (Test A/B/C selection, temperature, duration, solution prep)

2 Auto-Calculating PREN Field (with user-input alloy composition and validation logic)

3 CPT Estimation Engine (temperature-dependent pass/fail logic + optional regression-based prediction)

🎯 Applications

✓ Qualification of duplex/super duplex stainless steels for subsea piping systems
✓ Supplier verification and mill test report (MTR) review for critical process equipment
✓ Materials selection support during FEED (Front-End Engineering Design) for sour service or seawater-cooled systems

📐 Key Formulas

PREN (Pitting Resistance Equivalent Number)

PREN = %Cr + 3.3 × %Mo + 16 × %N

Empirical index estimating relative pitting corrosion resistance of stainless steels and CRAs; higher values indicate greater resistance.

PREN (with Tungsten)

PREN_W = %Cr + 3.3 × (%Mo + 0.5 × %W) + 16 × %N

Modified PREN for tungsten-containing alloys (e.g., super austenitics), where tungsten enhances pitting resistance similarly to molybdenum.

CPT Estimation (Empirical Regression)

CPT (°C) ≈ 0.15 × PREN + 12.5 (example linear model; vendor- or alloy-specific variants apply)

Approximate Critical Pitting Temperature derived from PREN; used for preliminary screening—actual CPT must be verified experimentally per ASTM G48.

🔗 Related Concepts

Localized Corrosion Ferric Chloride Corrosion Testing Alloy Composition Certification ISO 15156/NACE MR0175 Compliance Corrosion Allowance and Design Life Assessment

📚 References

ASTM G48-22: Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys

ISO 15156-2: Petroleum and natural gas industries — Materials for use in H₂S-containing environments in oil and gas production — Part 2: Cracking-resistant carbon and low-alloy steels, and the use of cast irons

NACE MR0175/ISO 15156 — Technical Guidance for CRA Selection in Oilfield Environments

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📐 Prerequisites

Understand these before this topic

→ Corrosion-Resistant Alloys - Complete Guide → Getting Started with Corrosion-Resistant Alloys → Understanding the Pourbaix Diagram for Alloy Selection

🔗 Engineering Applications

See how this applies across industries

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