![]() ![]() When welding stainless steels, it’s also important to choose a filler metal with low trace (also called tramp) elements. Avoid filler metals with an “H” designation, since these provide higher carbon content designed for applications that require greater strength at high temperatures. Welding a low-carbon base material with a standard filler metal can increase the carbon content of the weld joint and thereby increase the risk of corrosion. Look for filler metals with an “L” designation, such as ER308L, because these provide a lower maximum carbon content, which helps retain corrosion resistance in low-carbon stainless alloys. The filler metal used for stainless steel tube and pipe welding should enhance the weld properties and meet the application requirements. In stainless steel welding, filler metal selection is crucial to controlling carbon levels. Furthermore, upgrading the welding process can deliver productivity benefits without impacting quality. ![]() Applying too much heat input and using the wrong filler metal are two culprits.įollowing some best practices for stainless steel welding can help improve results and ensure that the metal maintains its corrosion resistance. However, the material doesn’t dissipate heat as well as mild steel or aluminum do, and poor welding practices can decrease its ability to resist corrosion. ![]() The corrosion resistance of stainless steel makes it an attractive choice for many critical tube and pipe applications, including high-purity food and beverage, pharmaceutical, pressure vessel, and petrochemical uses. Best practices can contribute to maintaining its corrosion resistance. It doesn’t dissipate heat as well as mild steel or aluminum, and it can lose some of its corrosion resistance if too much heat is put into it. Out of roundness, sometimes referred to as ovality is tube or pipe on the same cross-section of the outer diameter, roundness or ovality is difference between the maximum and minimum dimensions of outside diameter, is carefully measured the high and low points at any one section of the tube or pipe.Stainless steel isn’t necessarily difficult to work with, but welding it requires careful attention to detail. it is more reasonable that the American standard specify the OD tolerance is tight, compared to thickness tolerance.Ĭhina GB standards and EU standard have no weight tolerance specified, seamless tube & pipe in GB standard delivery goods as actual weight or theoretical weight, welded tube & pipe as theoretical weight or actual weight. Stainless steel tube & pipe outer diameter tolerances are mostly lower than American standards, and approaching the EU standards. Stainless steel tube & pipe wall thickness tolerance are the same as the general accuracy of American ASTM / ASME and EU standards, but slightly lower than the high requirements of the EU standards. SS tube and pipe standards are similar with EU standards in system, and absorb favorable experience in USA specifications. China StandardsĬhina has more quantity standards compared to European standards, but less than american standards, Wall thickness tolerance should be +/-10%t or better, and average thickness tolerance should be ( +/-20 – 22%t, 0 ), pipeline pipe has a larger tolerance, hot finished seamless pipe largest. ASTM A999īut A511 for seamless stainless steel mechanical tubing and A554 welded stainless steel mechanical tubing not conform to above standards, they have separate outside diameter and thickness tolerances.Īmerican standard outside diameter tolerance mainly used to represent the absolute value, over and below tolerances are often asymmetric, SS tube and pipe in American standard average tolerance can reach even higher than D4 class in EN ISO 1127 standard. America StandardĪmerica standard has two standard rules to specify outside diameter and thickness, ASTM A999 / A999M and A1016 / A1016M. The tolerances on outside diameter and thickness from above table, greater value shall be selected.ĮN 10312 has specific values in table series 1 and series 2. From D1 to D4 class for outer diameter, and T1 to T4 for wall thickness tolerance comply to DIN EN ISO 1127 standard, stainless steel tubes – Dimensions, tolerances and conventional masses per unit length. ![]()
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