ASME SB338 GR7 Titanium Alloy Steel Tube for Condenser and Boiler Application
ASME SB338 is a titanium and titanium alloy seamless/welded tube standard jointly developed by the American Society of Mechanical Engineers (ASME) and the International Society for Testing and Materials (ASTM), equivalent to standard ASTM B338, covering the requirements for 28 grades titanium and titanium alloy tubes used for surface condensers, evaporators, and heat exchangers. Seamless tubes under this standard are mainly formed by cold rolling or hot extrusion, and are preferred for use in high-pressure systems, while welded tubes are mainly produced by roll welding and annealing, with lower costs and suitable for medium and low pressure working environments.
ASME SB338 GR7 Boiler, Condenser and Heat Exchanger Tube Chemical Composition
| Element | Chemical Composition % |
| Grade 7 |
| Nitrogen, max | 0.03 |
| Carbon, max | 0.08 |
| Hydrogen, max | 0.015 |
| Iron, max | 0.30 |
| Oxygen, max | 0.25 |
| Palladium | 0.12-0.25 |
| Residuals, max each | 0.1 |
| Residuals, max total | 0.4 |
| Titanium | balance |
ASME SB338 Grade 7 is one of the most corrosion-resistant grades among titanium materials. The key reason is that palladium element has the characteristic of quickly and stably forming a passive film in corrosive environments, which is also the key advantage of GR.7 titanium alloy steel tubes. At the same time, titanium element provides a lightweight and high-strength foundation for tubes, and iron element controls the content of impurities in tubes.
ASME SB338 Grade 7 Titanium Alloy Steel Tube Heat Exchanger Tube Mechanical Properties
| Grade | Titanium Alloy Gr7 |
| Density | 0.163 lb/in3 |
| Tensile Strength | 50 |
| Yield Strength (0.2%Offset) | 40/65 |
| Elongation | 20% |
Detailed Product Description
| Specification | ASME SB338/ASTM B338 | Grade | GR7 |
| Type | Seamless/Welded | Size Standard | ASTM B16.10 & B16.19 & Customized |
| Surface | Polishing Or Unpolishing | Certification | ISO/CE/SGS |
| High Light | Condensers Ti Alloy Tube , GR7 Ti Alloy Tube , ASME SB338 Alloy Steel Seamless Tubes |
ASME SB338 Titanium Alloy Steel Tube Application
- Chemical/Petrochemical: Due to its resistance to hydrochloric acid, wet chlorine gas, and sulfur-containing media, ASME SB338 GR.7 titanium alloy steel tubes can be widely used in heat exchangers and reactor pipelines.
- Marine Engineering: Due to the strong resistance to seawater corrosion of ASME SB338 GR.7 titanium alloy steel tubes, they can be widely used in seawater desalination plants and marine pipelines.
- Nuclear power: ASME SB338 GR.7 titanium alloy steel tubes can meet the high-purity cleanliness requirements of cooling water systems for transport pipelines.
- Pharmaceutical/Food: Due to the strong stability of ASME SB338 GR.7 titanium alloy steel tubes and the absence of metal ion leaching during use, they can be widely used in bioreactors and sterile pipelines.
- Environmental protection: ASME SB338 GR.7 titanium alloy tubes are suitable for use in flue gas desulfurization (FGD) systems and wastewater treatment equipment.
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ASME SB338 Grade 7 Titanium Alloy Steel Tube for Condenser Boiler Images
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