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Seamless stainless steel tubes

Stainless steel tubes are widely used in chemical and petrochemical industries, nuclear and thermal power engineering, non-ferrous metallurgy, machine — and shipbuilding, food industry and others.

Usually stainless steel tubes are split into seamless and welded. In view of seam absence seamless stainless steel tubes are stronger and more reliable when compared to welded tubes. Therefore, seamless stainless steel tubes are widely used in corrosive media, under high and ultrahigh temperatures & pressures, other aggressive conditions.

Seamless stainless tubes are produced with the use of the following families of steel grades: austenitic stainless steels, ferritic stainless steels, martensitic stainless steels.

Austenitic stainless steel contains 16-25% of Chrome, 6-14% of Nickel, sometimes 2-6% of Molybdenum and low quantity of other elements; world consumption of this steel grade is 60-70%.

Ferritic stainless steel contains 15-20% of Chrome; some steel grades of this group can include titanium and molybdenum; features of seamless stainless steel tubes manufactured with use of ferritic steel grades are lower than those produced with using of austenitic steel grades, but the price is also lower.

Martensitic stainless steels; tubes manufactured with use of this steel grade are not as corrosion-resistant as the other two families but are extremely strong and tough.

Seamless stainless steel tubes are usually divided into the following product groups: boiler tubes, heat-exchanger tubes, instrumentationprecision tubes, furnace tubes, hollow bars, general tubes & pipes, OCTG, umbilical tubing. Depending on production method tubes can be grouped into hot — and cold-finished. Stainless tubes, which are produced in accordance to customer requirements as to length, are usually named fixed length, otherwise stainless tubes are referred to as random length.

Seamless stainless steel tubes have a constantly growing demand in different industries due to tube advantages in comparison to ferrous material tubes and welded stainless tubes.

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