Sour Service, Duplex SS, Delta Ferrite, Sensitization, PWHT SS, Weld Decay, PREN, ASTM A262, ASTM G48, Corrosion Types, EN 10204, P91/P92
Welded stainless steel components are prized in industries for their exceptional strength, heat resistance, and corrosion resistance. From chemical plants and refineries to food processing and marine applications, stainless steels are trusted for their durability. However, despite their superior performance, stainless steels are not immune to certain metallurgical challenges. One of the most critical of […]
Corrosion is much more than just rust forming on metal. It is the gradual breakdown of metals caused by chemical or electrochemical reactions with elements such as moisture, oxygen, acids, salts, or other environmental chemicals. Over time, corrosion weakens the surface and structure of metals, reducing their strength, appearance, and overall functionality. Left unchecked, corrosion
In industries like oil & gas, power, petrochemicals, and construction, material quality and traceability are critical. Whether you are a welding inspector, QA/QC engineer, or purchaser, you will frequently come across a Mill Test Certificate (MTC) or Mill Test Report (MTR). An MTC is a quality assurance document that validates the technical parameters of a
Written by : Neeraj Dubey In oil, gas, and petrochemical industries, few terms carry more weight in fabrication and design than “sour service.” It’s not just technical jargon—it’s a critical safety and engineering consideration. If equipment isn’t properly designed or fabricated for sour service, it could suffer from serious damage like cracking, leaks, or even
Introduction With increasing demand in the Oil & Gas, water purification, and chemical processing industries, Duplex Stainless Steels (DSS) have become essential materials. Their exceptional corrosion resistance, mechanical strength, and toughness make them ideal for high-performance applications.However, welding DSS is not difficult—but it is different. This article combines practical industry guidance and technical depth to
While the majority of welding metallurgy education centers on carbon and low-alloy steels, a significant proportion of welded fabrication involves other material families — stainless steels, aluminum alloys, and copper alloys. Each of these groups presents unique metallurgical challenges that differ
Titanium, light, corrosion resistant, and extremely strong material. Titanium is a silvery-gray metal with a density of approximately half that of steel i.e 4.51g/cm3 (0.163 lb/in³). Opposite to common beliefs titanium welding is not a rocket science. Titanium posses good weldability. To enhance its suitability for structural applications, titanium is alloyed with elements such as
Stainless steel also known as inox, corrosion-resistant steel(CRES), and rustless steel, is an alloy of iron which is resistant to corrosion and rust. It contains iron with chromium, nickel and other elements like molybdenum, carbon, manganese and nitrogen depending on specific grade. Stainless steel’s corrosion resistant property results from presence of chromium 10.5 % or
Pitting resistance is a critical factor in selecting materials for piping systems, particularly in industries where corrosion can pose significant challenges. One of the essential metrics used to evaluate this resistance is the Pitting Resistance Equivalent Number (PREN). This article delves into the complexities of pitting corrosion, how PREN number are determined, and what they
Sensitization is a phenomenon that can occur in stainless steel. It is a critical concept that needs to be understood as it can adversely affect the performance of stainless steel. This causes the steel or alloy to become susceptible to intergranular corrosion or intergranular stress corrosion cracking (SCC). What are stainless steels? Stainless steels are