Sandvik / ALLEIMA seamless tubing

For seamless stainless steel tubing, we recommend considering Sandvik / ALLEIMA 3R60.

Sandvik / ALLEIMA 3R60 is an austenitic chromium-nickel steel with at least 2.5% molybdenum and a low carbon content. The material and the quality of its processing make Sandvik / ALLEIMA seamless stainless steel tubing a suitable choice for installations requiring enhanced corrosion resistance.

Sandvik / ALLEIMA 3R60 is used in a wide range of industrial applications where ASTM 304 and 304L steels offer insufficient corrosion resistance. Typical examples include heat exchangers, condensers, pipelines, and cooling or heating coils in the chemical, petrochemical, pulp and paper, and food industries.

The following information applies to grade 3R60. Check the material grade of the specific tube against its designation and supply documentation; our range also includes other materials.

Corrosion resistance

The manufacturer reports good corrosion resistance for 3R60 in the following environments:

• Organic acids at high concentrations and moderate temperatures.
• Inorganic acids, such as phosphoric and sulfuric acids, at moderate concentrations and temperatures. The steel can also be used in sulfuric acid at concentrations above 90% at low temperatures.
• Salt solutions, such as sulfates, sulfides and sulfites.
• Alkaline environments, including caustic solutions.

Assess suitability for the specific medium based on its concentration, temperature and other operating conditions.

Intergranular corrosion

The low carbon content of Sandvik / ALLEIMA 3R60 provides better resistance to intergranular corrosion than AISI 316 steels. This is particularly beneficial in complex welding operations.

Pitting and crevice corrosion

Resistance to these types of corrosion increases with the molybdenum content. According to the manufacturer, Sandvik / ALLEIMA 3R60, with approximately 2.6% Mo, offers substantially better resistance than AISI 304 steels and better resistance than ordinary AISI 316 / 316L steels containing 2.1% Mo.

Corrosion in gaseous environments

For Sandvik / ALLEIMA 3R60, the manufacturer specifies use:

• In air up to 850 °C.
• In steam up to 750 °C.

These values describe the material's resistance in the stated environments; they do not automatically define the allowable operating temperature of a pressure installation. At high temperatures, material creep and mechanical loading must also be considered.

Further information on welding, dimensions and detailed corrosion resistance diagrams is available in the manufacturer's full documentation and the attached catalogue.

To calculate the allowable pressure for a selected tube size, use the Sandvik / ALLEIMA pressure calculator. Consider the material, outside diameter, wall thickness and operating temperature when selecting tubing.