Description

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.

Scope

Most of the grades are commonly known as the "straight-chromium" types and are characterized by being ferromagnetic. Two of these grades, TP410 and UNS S 41500 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. Grade TP439 is used primarily for hot-water tank service and does not require post-weld heat treatment to prevent attack of the heat affected zone.

Chemical Requirements (refer standard for table contents...)