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Lord Fin Tube--Ferritic and Martensitic Stainless Steel Tubing

ASTM A268ASTM A268/ASME SA268 Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service

Ferritic stainless steel (400) chromium content in 15%~30%, with a body centered cubic crystal structure. This kind of steel generally does not contain nickel, and sometimes contains a small amount of Mo, Ti, Nb and other elements, such steel has a large thermal conductivity, small expansion coefficient, good oxidation resistance, excellent resistance to stress corrosion and other characteristics, and more for the production of air, water vapor, water and oxidation of acid corrosion parts. Ferritic stainless steel price is relatively low and stable, and has many unique characteristics and advantages, it has been proved that in many previously considered only the application of austenitic stainless steel (300 lines), ferritic stainless steel is a very good alternative material, ferrite stainless steel does not contain nickel, the main elements for chromium (>10%) and iron, chromium is a special stainless steel corrosion resistant elements, its price is relatively stable
This specification covers a number of grades of nominal-wall-thickness,stainless steel tubing for general corrosion-resisting and high-temperature service.Most of these grade sare commonly known as the“straight-chromium”types and are characterized by being ferro magnetic.Two of theseg rades,TP410 and UNS S41500(Table1),are amenable to hardening by heat treatment,and the high-chromium,ferritic alloys are sensitive to notch-brittleness on slow cooling to ordinary temperatures. These features should be recognized in the use of these materials.  GradeTP439 is used primarily for hot-water tank service and does not require post-weld heat treatment to prevent attack of the heat affected zone.

Ferritic stainless steel;seamless steel tube;stainless steel tube;steel tube;welded steel tube

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