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ASTM A312 A 312 / SA 312 Standard Pecification Overview

May 24 2023

1.Standard scope of application:
1.1 This standard applies to high temperature and general corrosion seamless and welded austenitic stainless steel nominal pipes.
Note I: When the low-temperature impact test criterion is 15it-1b (20J) or the lateral expansion is 15uin. (0.38nm), this standard is some of the austenite approved by some IE force containers or the nominal bamboo specification Body stainless steel grade, it is not necessary to conduct actual tests.
For example, stainless steel daggers used for temperatures as low as -425F (-250C) grades TP304. 1P304L. and 1P347 are ASME Pressure Vessel Code No. N@Vol.
1 and Chemicals. and Refinery Nominal Pipe Code ANSIB31.3 Accepted, there is no need to escape the impact test identification.
Other AISI stainless steel grades are usually used at temperatures as low as -325T (-200). Acceptable without impact test. In some cases, Ding [can require an impact test.

For example, materials with chromium or nickel materials outside the AISI standard, and materials with carbon content exceeding 0.10%, when the use temperature is lower than -50F (-45C), according to ASME Volume 1 The impact test is carried out.

1.2 Grades TP304H, TP309H, TP309HCb, TP310H, TP3I0HCb, TP316H, TP321H, TP347H and TP348H are improved grades of TP304, TP309Cb, TP309S, TP310Cb, TP310S, TP316, TP32I, TP347 and TP348, suitable for high temperature use.

1.3 Optional supplementary requirements are provided for pipe where a greater degree of testing is desired. These supplementary requirements call for additional tests to be made and, when desired, it is permitted to specify in the order one or more of these supplementary requirements.

1.4 Table X1.1 lists the standardized dimensions of welded and seamless stainless steel pipe as shown in ANSI B36.19. These dimensions are also applicable to heavily cold worked pipe. Pipe having other dimensions is permitted to be ordered and furnished provided such pipe complies with all other requirements of this specification.

1.5 Grades TP321 and TP321H have lower strength requirements for pipe manufactured by the seamless process in nominal wall thicknesses greater than 3/8 in. [9.5 mm].

1.6 The values stated in either SI units or inch-pound 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.

NOTE 2: The dimensionless designator NPS (nominal pipe size) has been substituted in this standard for such traditional terms as “nominal diameter,” size,” and “nominal size.”

ASTM A312 A 312 Standard PDF Download Link:

3.Related ASTM Standards:

A262 Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels

A370 Test Methods and Definitions for Mechanical Testing of Steel Products

A941 Terminology Relating to Steel, Stainless Steel, Related Alloys, and Ferroalloys

A999/A999M Specification for General Requirements for Alloy and Stainless Steel Pipe

A1016/A1016M Specification for General Requirements for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless Steel Tubes

E112 Test Methods for Determining Average Grain Size

E381 Method of Macroetch Testing Steel Bars, Billets, Blooms, and Forgings

E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)

You Also Find ASTM Standard Via Keywords

Austenitic Stainless Steel - Corrosive Service Applications - Forming - High-Temperature Services - Seamless Pipes And Tubes - Welded Pipes And Tubes

ICS Code

ICS Number Code 23.040.10 (Iron and steel pipes)


UNSPSC Code 40171621(Industrial welded stainless steel pipe); 40171622(Industrial seamless stainless steel pipe)

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