This guide covers standard specification for a number of grades of nominal-wall-thickness, welded ferritic and martensitic stainless steel tubing for general corrosion-resisting and high-temperature service. The steel shall conform to the required chemical composition for carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, molybdenum, aluminum, copper, nitrogen, titanium, and columbium. The number of tubes in a lot heat treated by the continuous process shall be determined from the size of the tubes. The steel shall conform to the following tensile properties: tensile strength, yield strength, and elongation. The tubes shall have a hardness number that will not exceed the prescribed Brinell and Rockwell hardness values. Several mechanical tests shall be conducted, namely: tension test; flaring test (for seamless tubes); flange test (for welded tubes); hardness test; reverse flattening test; intergranular corrosion test; and hydrostatic or nondestructive electric test.1.1 This specification2 covers a number of grades of nominal-wall-thickness, stainless steel tubing for general corrosion-resisting and high-temperature service. Most of these grades are commonly known as the “straight-chromium” types and are characterized by being ferromagnetic. Two of these grades, TP410 and UNS S 41500 (Table 1), 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.TABLE 1  ContinuedGrade TP439 . . . . . . TP430 Ti TPXM-27 TPXM-33A 18Cr-2Mo 29-4 29-4-2 26-3-3 25-4-4 ... . . . . . . . . . . . . TP468UNSDesignation S43035 S43932 S41500B S43036 S44627 S44626 S44400 S44700 S44800 S44660 S44635 S44735 S32803 S40977 S43940 S42035 S46800Element Composition, %C, max 0.07 0.030 0.05 0.10 0.01A 0.06 0.025 0.010 0.010 0.030 0.025 0.030 0.015C 0.03 0.03 0.08 0.030Mn, max 1.00 1.00 0.5–1.0 1.00 0.40 0.75 1.00 0.30 0.30 1.00 1.00 1.00 0.5 1.50 1.00 1.00 1.00P, max 0.040 0.040 0.03 0.040 0.02 0.040 0.040 0.025 0.025 0.040 0.040 0.040 0.020 0.040 0.040 0.045 0.040S, max 0.030 0.030 0.03 0.030 0.02 0.020 0.030 0.020 0.020 0.030 0.030 0.030 0.005 0.015 0.015 0.030 0.030Si, max 1.00 1.00 0.60 1.00 0.40 0.75 1.00 0.20 0.20 1.00 0.75 1.00 0.50 1.00 1.00 1.00 1.00Ni 0.50 max 0.50 3.5–5.5 0.75 max 0.5D max 0.50 max 1.00 max 0.15 max 2.0–2.5 1.0–3.50 3.5–4.5 1.00 max 3.0–4.0 0.30–1.00 . . . 1.0–2.5 0.50Cr 17.00– 17.0–19.0 11.5–14.0 16.00– 25.0–27.5 25.0–27.0 17.5–19.5 28.0–30.0 28.0–30.0 25.0–28.0 24.5–26.0 28.00– 28.0–29.0 10.50–12.50 17.50–18.50 13.5–15.5 18.00–20.00   19.00      19.50                30.00          Mo ... ... 0.5–1.0 ... 0.75–1.50 0.75–1.50 1.75–2.50 3.5–4.2 3.5–4.2 3.0–4.0 3.5–4.5 3.60–4.20 1.8–2.5 . . . . . . 0.2–1.2 . . .Al, max 0.15 0.15 . . . ... ... ... ... ... ... ... ... ... . . . . . . . . . . . . . . .Cu, max ... ... . . . ... 0.2 0.20 ... 0.15 0.15 ... ... ... . . . . . . . . . . . . . . .N, max 0.04 0.030 . . . ... 0.015 0.040 0.035 0.020E 0.020E 0.040 0.035 0.045 0.020 0.030 . . . . . . 0.030Ti 0.20 + 4 (C   . . . 5 × C min; ... 7 × (C + N) ... ... ... ... ... ... . . . . . . 0.10–0.60 0.30–0.50 0.07–0.30   + N) min;      0.75 max   but no less                         1.10 max          than 0.20                                   min; 1.00                                   max                                                         NbG ...   . . . ... 0.05–0.20 ... ... ... ... ... ... ... 0.15–0.50F . . . (3 × %C + 0.30) min . . . 0.10–0.60Other   (Ti + Nb) = {0.20 + 4 × (C + N)} min.; 0.75 max         (Ti + Nb) = 0.020 + 4 × (C + N) min; 0.80 max     (Ti + Nb) = 0.20–1.00 and 6 × (C + N) min (Ti + Nb) = 0.020 + 4 × (C + N) min; 0.80 max (Ti + Nb) = 0.020–1.00 and 6 × (C + N) min         (Ti + Nb) = 0.020 + 4 × (C + N) min; 0.80 max                                                                      1.2 An optional supplementary requirement is provided, and when desired, shall be so stated in the order.1.3 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. The inch-pound units shall apply unless the “M” designation of this specification is specified in the order.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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