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Welding Help Arc Covered Electrode Classification System Printer-Friendly Page Minimum Tensile and Yield Strengths by AWS Class Class Min. Tensile Strength (psi) Min. Yield Strength (psi) E60xx 62,000 50,000 E70xx 70,000 57,000 E80xx 80,000 67,000 E90xx 90,000 77,000 E100xx 100,000 87,000 E110xx 110,000 95,000 E120xx 120,000 107,000 Chemical Symbols and Effects for the Elements C Carbon Most effective hardening element in steel Mn Manganese Hardening element second to Carbon Si Silicon Deoxidizer, moderate strengthener P Phosphorous Causes cracking if too high S Sulfur Aids in machining - cracking problems like P Cr Chromium Hardness(low) - corrosion resistance(high) Ni Nickel Hardening element - better cold toughness Mo Molybdenum Hardenability - high temp tensile - creep strength B Boron Very small amounts increase hardness Cu Copper Corrosion resistance(low) - cracking(high) Al Aluminum Deoxidizer - improves mechanical properties Ti Titanium Removes: Oxygen,S,N, and C N Nitrogen Improves Strength - lowers toughness Cb Columbium Hardness - improves mechanical properties V Vanadium Hardness - improves mechanical properties Arc Classification System Page 2

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