ASTM · ASTM B626 / ASME SB626
Welded Tubes according to ASTM B626 (ASME SB 626)
Technical requirements of the ASTM B626 standard for heat exchanger equipment
The ASTM B626 specification establishes strict industry standards for the production of welded tubes intended for use in heat exchangers, condenser units, and high-temperature circuits. The standard covers products made from corrosion-resistant nickel and nickel-cobalt alloys, ensuring stability in aggressive environments.
The range of materials meeting requirements includes the following alloys:
- N06 family alloys: UNS N06002, UNS N06007, UNS N06022, UNS N06030, UNS N06035, UNS N06058, UNS N06059, UNS N06200, UNS N06210, UNS N06230, UNS N06455, UNS N06617, UNS N06686, UNS N06975, UNS N06985
- N08 family alloys: UNS N08031, UNS N08320
- N10 family alloys: UNS N10001, UNS N10242, UNS N10276, UNS N10362, UNS N10624, UNS N10629, UNS N10665, UNS N10675
- N12 family alloys: UNS N12160
- R20 family alloys: UNS R20033
- R30 family alloys: UNS R30556
Geometric parameters of the tubes regulated by the standard include:
- Nominal outside diameter: from 1/8 to 3 1/2 inches (ranging from 3.2 to 88.9 mm).
- Wall thickness: from 0.015 to 0.148 inches (ranging from 0.41 to 3.7 mm).
When designing systems, it should be noted that the inch-pound values are considered standard. The metric values in parentheses are provided for informational purposes only. EV Group China ensures that products comply with strict quality control protocols, eliminating the risks of weld defects in critical assemblies.
To ensure industrial safety during the operation of finished products, it is recommended to refer to the current Material Safety Data Sheet (MSDS), which is provided by the manufacturer for each batch of metal products.
Note: The systematization of alloy grades is performed in accordance with the ASTM E527 and SAE J1086 protocols (Unified Numbering System - UNS).