Chemical components

Product Description

AWS E9018-M is a low-hydrogen iron powder coated electrode compliant with AWS A5.1 and A5.5 standards, designed for welding high-strength low-alloy steels with minimum tensile strength of 620 MPa (90 ksi). Featuring a basic flux coating with low diffusible hydrogen content and specific alloy additions (typically Mn, Ni, Cr, Mo), it provides weld metal with superior mechanical properties and toughness. Compatible with AC and DC+ polarities, it supports all-position welding for critical high-strength applications requiring excellent weld integrity.

Features

▪ High Strength Performance: Delivers weld metal with minimum tensile strength of 620 MPa (90 ksi), yield strength ≥530 MPa, and elongation ≥17%. The alloyed weld metal provides strength matching high-strength low-alloy base materials including HY-80 and similar steels.
▪ Low-Temperature Toughness: The alloyed composition with controlled alloy elements (Ni, Mo) ensures excellent impact toughness at temperatures as low as -50°C or lower, depending on specific manufacturer specifications. Essential for cryogenic and low-temperature service applications.
▪ Low-Hydrogen Crack Resistance: Basic coating with diffusible hydrogen content typically ≤4ml/100g or H4 classification, significantly reducing the risk of hydrogen-induced cracking in high-strength steels and thick sections. Critical for welding restrained joints and high-carbon equivalent materials.
▪ Excellent Mechanical Properties: The combination of manganese, nickel, chromium, and molybdenum in the weld deposit provides balanced strength, ductility, and toughness. The iron powder coating improves deposition efficiency while maintaining all-position capability.

Applications

▪ Ideal for high-strength structural applications requiring weld metal with superior mechanical properties and low-temperature toughness, E9018-M is widely used in:
▪ Naval & Marine: Shipbuilding, submarines, and offshore platforms using HY-80, HY-100, and similar high-strength steels requiring excellent toughness in marine environments.
▪ Pressure Vessels & Piping: High-pressure vessels, reactors, and piping systems in petrochemical, power generation, and process industries requiring high-strength welds with good notch toughness.
▪ Heavy Construction & Bridges: Critical structural components, suspension bridges, and heavy equipment fabrication using high-strength low-alloy steels where weld quality and toughness are paramount.
▪ Cryogenic Applications: Storage tanks, piping, and equipment for low-temperature service requiring excellent impact toughness at sub-zero temperatures.