ASTM A1098/A1098M-18 (2022) PDF

Full title and description

Standard Specification for Welded Austenitic, Ferritic, Martensitic and Duplex Stainless Steel Boiler, Superheater, Condenser, and Heat Exchanger Tubes with Textured Surface(s) — designated A1098/A1098M-18 (reapproved 2022).

Abstract

This specification covers average- or minimum-wall thickness welded tubes made from a variety of austenitic, ferritic, martensitic and duplex stainless steels in which the external surface, internal surface, or both surfaces have a textured configuration produced (by cold-forming texturization of strip material prior to welding) to improve heat transfer and/or fluid flow. Typical applications include boiler, superheater, condenser and heat-exchanger tubing up to approximately 1.5 in. (38 mm) outside diameter and typical wall thicknesses up to about 0.079 in. (2 mm).

General information

• Status: Active / Current (A1098/A1098M-18 reapproved 2022).
• Publication date: Current edition approved September 1, 2022; published in 2022 (reapproval of the 2018 designation).
• Publisher: ASTM International (ASTM Committee A01 — Steel, Stainless Steel and Related Alloys).
• ICS / categories: 23.040.10 — Iron and steel pipes / stainless steel tubing.
• Edition / version: A1098/A1098M‑18 (reapproved 2022); designation indicates original 2018 revision with reapproval in 2022.
• Number of pages: Approximately 10 pages (published reapproval document; published formats list 10–11 pages depending on publisher).

Scope

The standard specifies requirements for welded stainless steel tubing with textured surfaces intended to enhance heat transfer and fluid-dynamic behavior in heat-exchange equipment. It defines applicable material grades (austenitic, ferritic, martensitic and duplex stainless steels), dimensional limits (typical OD up to 1.5 in / 38 mm), wall thickness ranges, permitted texture production methods (cold-forming/texturization of strip before welding), and applicable supplementary requirements and safety notes. Units in the standard are presented in inch‑pound or SI (M) systems, with each system to be regarded independently.

Key topics and requirements

• Definition and classification of textured-surface welded stainless steel tubing (internal, external, or both surfaces textured).
• Permitted material groups: austenitic, ferritic, martensitic and duplex stainless steels and associated chemical/compositional limits for grades referenced.
• Dimensional and tolerance limits (typical OD up to 1.5 in / 38 mm; wall thickness ranges up to ~0.079 in / 2 mm).
• Manufacturing process requirement: texture applied by cold-forming the strip prior to welding; welded tube production and finishing requirements.
• Referenced testing and general requirements (mechanical testing, chemical analysis, related ASTM general-requirements standards and test methods).
• Specification of units (inch‑pound or SI (M)) and note that the two systems are to be used independently.

Typical use and users

Used by tubing manufacturers, heat-exchanger and boiler equipment designers, material specifiers, procurement professionals, and QA/QC engineers who require standardized properties, dimensions and surface-texturing definitions for stainless steel tubes used in boilers, superheaters, condensers, evaporators and other heat-transfer apparatus. The standard helps purchasers and fabricators ensure compatibility of textured-tube performance with thermal and hydraulic design requirements.

Related standards

A1098/A1098M references and is used alongside a number of ASTM specifications and test methods for tubular products and stainless steels, including (but not limited to) ASTM A249/A249M, A268/A268M, A370, A480/A480M, A789/A789M, and A1016/A1016M; terminology and related committee documents (ASTM A941) are also relevant. These related standards address seamless and welded tubing, general requirements, mechanical testing, and material-specific practices.

Keywords

textured tube, stainless steel tubing, welded tube, austenitic stainless, ferritic stainless, martensitic stainless, duplex stainless, boiler tube, superheater tube, condenser tube, heat exchanger tube, heat-transfer enhancement, cold-formed texture.

FAQ

Q: What is this standard?

A: ASTM A1098/A1098M-18 (reapproved 2022) is an ASTM International specification that defines requirements for welded stainless steel tubes whose internal and/or external surfaces have a prescribed textured configuration for improved heat transfer or fluid flow.

Q: What does it cover?

A: It covers material groups (austenitic, ferritic, martensitic and duplex stainless steels), dimensional and thickness ranges (typical OD up to 1.5 in / 38 mm and walls up to about 0.079 in / 2 mm), methods for producing textured surfaces (cold-forming of strip prior to welding), and related manufacturing and testing requirements.

Q: Who typically uses it?

A: Tube manufacturers, heat-exchanger and boiler designers, specifiers, procurement and QA/QC staff in power generation, process industries and any application requiring enhanced heat-transfer tubing.

Q: Is it current or superseded?

A: The A1098/A1098M-18 designation was reapproved in 2022 (current edition approved Sept. 1, 2022 and published in 2022). Users should confirm the latest status with ASTM or their standards provider before use.

Q: Is it part of a series?

A: It is part of ASTM Committee A01 publications covering steel and stainless steel tubular products and is intended to be used in conjunction with other ASTM tubing and general-requirement standards (see Related standards above).

Q: What are the key keywords?

A: textured surface, welded stainless steel tube, boiler tube, heat exchanger tube, austenitic/ferritic/martensitic/duplex stainless steel, cold-formed texture.