ASTM A250/A250M-05 (2014) PDF

Full title and description

ASTM A250/A250M-05(2014) — Standard Specification for Electric-Resistance-Welded Ferritic Alloy‑Steel Boiler and Superheater Tubes. This specification defines requirements for minimum-wall‑thickness, electric‑resistance‑welded carbon‑molybdenum and chromium‑molybdenum ferritic alloy‑steel tubing intended for boiler and superheater service, including grade designations, dimensional limits, chemical composition, mechanical properties and optional non‑destructive examination requirements.

Abstract

This specification covers grades designated T1, T1a, T1b, T2, T11, T12 and T22 of electric‑resistance‑welded ferritic alloy‑steel boiler and superheater tubes. It sets limits for outside diameter and minimum wall thickness commonly supplied, defines chemical composition limits and mechanical property requirements (tensile strength, yield strength, elongation), specifies hardness limits, and includes an optional supplementary requirement for non‑destructive examination for certain ASME applications. Values are given in inch‑pound units with SI equivalents shown in brackets; the inch‑pound units apply unless the “M” designation is specified.

General information

• Status: Withdrawn (withdrawal announced November 2017).
• Publication date: Reapproved edition effective October 1, 2014 (designation A250/A250M‑05(2014)).
• Publisher: ASTM International (American Society for Testing and Materials).
• ICS / categories: 23.040.10 — Iron and steel pipes / tubular products.
• Edition / version: A250/A250M‑05 (reapproved 2014).
• Number of pages: 4 pages (brief specification sheet).

Scope

The standard applies to electric‑resistance‑welded ferritic alloy‑steel tubing for boiler and superheater service in grades T1, T1a, T1b, T2, T11, T12 and T22. Typical outside diameters range from 1/2 in. to 5 in. [12.7 to 127 mm] and minimum wall thicknesses normally range from 0.035 to 0.320 in. [0.9 to 8.1 mm]; other sizes may be furnished if they meet the specification’s requirements. Mechanical property requirements do not apply to tubing smaller than 1/8 in. [3.2 mm] inside diameter or 0.015 in. [0.4 mm] thickness. An optional supplementary requirement provides non‑destructive examination (ultrasonic) for specific applications (for example, certain ASME uses). Values are given in inch‑pound units with SI values shown in brackets; the inch‑pound units apply unless the “M” designation is ordered.

Key topics and requirements

• Covered grades: T1, T1a, T1b, T2, T11, T12, T22 (carbon‑molybdenum and chromium‑molybdenum ferritic alloy steels).
• Production method: electric‑resistance welding (ERW) for minimum‑wall‑thickness tubing.
• Dimensional ranges: commonly 1/2 in. to 5 in. outside diameter; typical minimum wall 0.035–0.320 in. (sizes outside these ranges may be supplied if compliant).
• Chemical composition requirements for C, Mn, P, S, Si, Mo, Cr and other specified elements.
• Mechanical property requirements: specified tensile strength, yield strength and elongation; mechanical limits may be waived for very small sizes as noted in the scope.
• Hardness limits (Brinell/Rockwell) to control embrittlement and heat‑treatment effects.
• Optional supplementary requirement for non‑destructive examination (ultrasonic testing of weld zone or tubing) for applications such as certain ASME code uses.
• Unit systems: Inch‑pound is primary unless the “M” designation (SI) is specified; SI values are shown in brackets but not exact equivalents.

Typical use and users

Used by tube manufacturers, mill purchasers, pressure‑vessel and boiler fabricators, plant engineers, inspection authorities and procurement/specification writers in the power generation, petrochemical and heavy‑industrial sectors where ERW ferritic alloy‑steel tubing may be specified for boiler and superheater applications. Also referenced by test labs and third‑party inspectors when verifying chemical, mechanical and NDE requirements.

Related standards

Referenced and related documents include ASTM A1016/A1016M (general requirements for ferritic alloy steel, austenitic alloy steel, and stainless steel tubes), ASTM E273 and E213 (practices for ultrasonic testing of weld zones and tubing), and other tubular product standards used in high‑temperature and pressure applications (seamless and welded boiler/power tubing standards). Note: A250/A250M was withdrawn in 2017 (withdrawn without replacement due to limited industry use).

Keywords

ASTM A250, A250M, electric‑resistance‑welded, ERW, ferritic alloy‑steel, boiler tubes, superheater tubes, T1, T11, T22, carbon‑molybdenum, chromium‑molybdenum, ultrasonic testing, NDE, tubular products.

FAQ

Q: What is this standard?

A: ASTM A250/A250M‑05(2014) is the ASTM specification that defined requirements for electric‑resistance‑welded ferritic alloy‑steel boiler and superheater tubes (various T‑grades).

Q: What does it cover?

A: It covers grade designations (T1, T1a, T1b, T2, T11, T12, T22), typical dimensional ranges, chemistry limits, mechanical properties (tensile, yield, elongation), hardness limits and an optional supplementary requirement for ultrasonic NDE of welds/tubes for certain ASME uses.

Q: Who typically uses it?

A: Tube manufacturers, plant and boiler engineers, procurement/specification writers, fabricators and inspection bodies involved in boiler and superheater piping and tubing selection and acceptance.

Q: Is it current or superseded?

A: It is withdrawn. The A250/A250M designation was reapproved in 2014 (A250/A250M‑05(2014)) but the document was withdrawn in November 2017; ASTM lists it as withdrawn and indicates no direct replacement due to limited industry usage.

Q: Is it part of a series?

A: Yes — it is part of ASTM’s A-series standards covering iron and steel products (under Committee A01 for Steel, Stainless Steel and Related Alloys) and relates to other tubular product standards and test practices referenced in the document.

Q: What are the key keywords?

A: Boiler tube, superheater tube, electric‑resistance‑welded (ERW), ferritic alloy steel, T1/T11/T22, chemical composition, tensile properties, hardness, ultrasonic testing.