CoreMetal Technical Team

What Is Weathering Steel? Weathering steel — commonly known by the trademark name Corten — is a group of low-alloy structural steels designed to develop a stable, protective rust patina when exposed to the atmosphere. Unlike conventional carbon steel, which continues to corrode until it fails, weathering steel forms a dense, adherent oxide layer that

The Critical Importance of Pipeline Leak Detection Pipeline leaks cause environmental damage, product loss, safety hazards, and significant financial losses. The U.S. Pipeline and Hazardous Materials Safety Administration (PHMSA) reports that pipeline incidents cause millions of dollars in damage annually. Effective leak detection systems (LDS) are now required by regulation in most jurisdictions worldwide. Modern

Sour Service: One of the Most Demanding Environments “Sour service” refers to environments containing hydrogen sulfide (H₂S) — commonly encountered in oil and gas production, natural gas processing, sour water systems, and refinery operations. H₂S is one of the most aggressive corrosive agents in industrial service, causing sulfide stress cracking (SSC), hydrogen-induced cracking (HIC), and

The Two Most Important Titanium Alloys Titanium Grade 2 (CP-Ti, UNS R50400) and Grade 5 (Ti-6Al-4V, UNS R56400) represent the two most widely used titanium materials in industry. Grade 2 is the workhorse of commercially pure titanium — chosen for corrosion resistance and formability. Grade 5 is the dominant aerospace alloy — prized for its

The Challenge of Thermal Expansion in Steel Piping Steel pipes expand and contract with temperature changes. For carbon steel, the thermal expansion coefficient is approximately 12 × 10⁻⁶ /°C — meaning a 100-meter pipeline experiencing a 200°C temperature increase will grow by approximately 240 mm. Without proper accommodation, this growth creates enormous thermal stresses that

Why Compare Nickel 200 and Nickel 201? Nickel 200 (UNS N02200) and Nickel 201 (UNS N02201) are commercially pure wrought nickel alloys that share nearly identical compositions — with one critical difference: carbon content. This seemingly small difference has significant implications for high-temperature service, fabrication, and application suitability. For engineers and procurement specialists specifying nickel

What Is Stainless Steel Electropolishing? Electropolishing is an electrochemical process that removes material from a stainless steel surface to produce a smooth, bright, and corrosion-resistant finish. Unlike mechanical polishing, electropolishing works at the microscopic level — removing surface peaks preferentially and leaving a uniform, stress-free surface. In 2026, electropolishing has become the standard surface treatment