ASTM A268 Stainless Steel Pipe Grade TP446-1 - S44600

Specifications

ASTM A268 / A268M - 10
Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service

Abstract
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.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

1. Scope
1.1 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 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. 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.
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.

2. Referenced Documents (purchase separately)
ASTM Standards
A480/A480M Specification for General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip
A763 Practices for Detecting Susceptibility to Intergranular Attack in Ferritic Stainless Steels
A1016/A1016M Specification for General Requirements for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless Steel Tubes
E213 Practice for Ultrasonic Testing of Metal Pipe and Tubing
E273 Practice for Ultrasonic Testing of the Weld Zone of Welded Pipe and Tubing

3. Steel Grade
Grade - UNS Designation
ASTM A268 Grade TP405 - S40500
ASTM A268 Grade TP410 - S41000
ASTM A268 Grade TP429 - S42900
ASTM A268 Grade TP430 - S43000
ASTM A268 Grade TP443 - S44300
ASTM A268 Grade TP446-1 - S44600
ASTM A268 Grade TP446-2 - S44600
ASTM A268 Grade S40800
ASTM A268 Grade TP409 - S40900
ASTM A268 Grade TP439 - S43035
ASTM A268 Grade S41500
ASTM A268 Grade TP430 Ti - S43036
ASTM A268 Grade TP XM-27 - S44627
ASTM A268 Grade TP XM-33 - S44626
ASTM A268 Grade 18Cr-2Mo - S44400
ASTM A268 Grade 29-4 - S44700
ASTM A268 Grade 29-4-2 - S 44800
ASTM A268 Grade 26-3-3 - S44660
ASTM A268 Grade 25-4-4 - S44635
ASTM A268 Grade S44735
ASTM A268 Grade S32803
ASTM A268 Grade S40977
ASTM A268 Grade S43940
ASTM A268 Grade S42035
ASTM A268 Grade TP468 - S46800

Keywords
Corrosive Service Applications - Ferritic Stainless Steel - High-Temperature Service Applications - High-Temperature Services - Martensitic Stainless Steel - Seamless Pipes And Tubes - Seamless Steel Tubes - Stainless Steel Tubes - Tubular Products - Welded Pipes And Tubes - Welded Steel Tubes