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A519 gr 4140 Seamless Steel Tubing is an alloy steel grade that contains elements like chromium-, molybdenum-, and manganese. The ASTM A519 Grade 4140 is low alloy steel, which offers superior characteristics. For instance, some of the vital characteristics of specified A519 4140 Chrome Alloy Steel Hf Smls Tubing include high fatigue strength, high abrasion and impact resistance, along with good toughness, and torsional strength properties. As typical of this alloy steel, this particular specified Alloy Steel A519 4140 Square Tubing material could be welded using all conventional shop practices. However, the mechanical properties of this ASTM A519 Grade 4140 pipe tend to get affected these tubes are welded in the heat-treated condition. Hence, post-weld heat treatment must be conducted on the ASTM A519 Grade 4140 Mechanical Tubing.