About Tube-Lok - Duplex Steel Tubes Supplier in Spain

Tube-Lok is located in Minden, Spain and lists nine active products in its catalogue. All nine entries refer to the same item, a duplex stainless steel tube designated S31803. The S31803 alloy belongs to the duplex family and is commonly used where high strength and corrosion resistance are required. The catalogue does not differentiate dimensions or pressure classes, indicating a generic listing of the alloy tube. The supplier also categorises its offerings under Duplex Boxes, Printed Duplex Boxes and Duplex Paper Board, suggesting related packaging or component products.

The profile description states that Tube-Lok manufactures accessories for ultra‑high‑purity and high‑purity stainless steel tubing, as well as nickel‑alloy fasteners and instrumentation valves. Materials mentioned include ferritic, austenitic and duplex stainless steels, nickel alloys, copper and titanium. Such alloys cover a range from standard carbon steel to commercially pure nickel alloys used in demanding environments. The company positions itself among long‑standing steel suppliers, though no specific founding year or capacity figures are provided. No certifications are listed in the supplied data.

Product Range and Specialties of Tube-Lok

The catalogue focuses on duplex stainless steel tube S31803 (UNS S32205), a material that complies with ASTM A182 F22 and EN 10217‑2 specifications. Typical commercial dimensions for this grade span nominal pipe sizes from ½ inch to 24 inch with wall thicknesses from 2 mm to 30 mm, and pressure classes up to 300 bar. Buyers often request mill test certificates showing chemical composition within ±0.02 % for elements such as Cr (22‑23 %), Mo (3‑3.5 %) and N (0.14‑0.20 %). Standard surface conditions include mill finish, pickled‑passivated, or electropolished, each affecting corrosion performance. Common quality marks for duplex tube include EN 10204 3.1 or 3.2 inspection certificates.

In addition to tubing, the supplier lists Duplex Boxes, Printed Duplex Boxes and Duplex Paper Board, which are typically used for packaging or component housings in the food, pharmaceutical and chemical sectors. These products are often manufactured from the same duplex stainless steel sheet or board, with thicknesses from 0.5 mm to 5 mm and may carry ISO 9001 quality management certification.

Trade and Export Information - Tube-Lok

Spain is a recognized exporter of duplex stainless steel tube, and shipments are classified under HS Chapter 73, particularly heading 7304.20 for stainless steel tubes and pipes. Major import markets for this product include the European Union, the Middle East, and Asia, where the oil‑and‑gas, petrochemical and power generation industries require high‑performance alloys. Typical export logistics involve containerised loads of 20‑ft or 40‑ft containers, or bulk shipments on roll‑on/roll‑off vessels for larger coils, with Incoterms such as FOB Barcelona or CIF Dubai frequently used. Importing countries generally request certificates of conformity to ASTM, EN or ISO standards, along with a material test report and a declaration of compliance with REACH for traceability of alloying elements. Customs inspections often verify the HS code, weight, and that the accompanying commercial invoice references the grade S31803 to avoid misclassification.

Buyers of duplex tube from Spain also look for packaging that protects the surface finish, commonly using wooden crates with moisture‑resistant liners or steel drums for smaller lengths. The supplier’s listed top categories of boxes and paper board suggest auxiliary products that can be shipped alongside tube to support end‑use packaging needs.

Sourcing from Tube-Lok - Buyer Guidance

When sourcing the S31803 duplex tube from Tube‑Lok, buyers should request an EN 10204 3.1 or 3.2 mill test certificate, a full chemical analysis, and mechanical test results for tensile strength, yield point and impact toughness at - 40 °C. Verification of dimensions, pressure rating and surface condition should be confirmed against the technical data sheet before contract finalisation. Because the catalogue does not specify size ranges, buyers are advised to obtain a quotation that lists available nominal sizes, wall thicknesses and delivery lead times. For the ancillary products such as Duplex Boxes, confirming the sheet thickness, material grade and surface finish will ensure compatibility with the tube applications.

Samples of the duplex tube are commonly provided in short lengths (e.g., 1 m) under the buyer’s Incoterm, and the supplier should supply a test report for the sample batch. Requesting compliance documentation for REACH and, where applicable, ISO 9001 certification will help align with typical import requirements.

What alloy grade does the tube listed by Tube‑Lok correspond to?

The listed product is a duplex stainless steel tube designated S31803, which corresponds to UNS S32205 and conforms to ASTM A182 F22 and EN 10217‑2 specifications.

Which material standards are typically applied to this type of tube?

Buyers usually require compliance with ASTM A182, EN 10217‑2, and a mill test certificate issued under EN 10204 3.1 or 3.2. These documents confirm chemical composition and mechanical properties.

What typical dimensions are available for S31803 duplex tube?

Commercial suppliers offer nominal pipe sizes from ½ inch (DN 15) up to 24 inch (DN 600) with wall thicknesses ranging from 2 mm to 30 mm. Exact size availability should be confirmed with the supplier for each order.

What certifications should a buyer request from Tube‑Lok for the duplex tube?

Request an EN 10204 3.1/3.2 mill test certificate, a detailed chemical composition analysis, a mechanical test report, and, if required by the destination, REACH compliance documentation.

Which markets commonly import duplex stainless steel tube from Spain?

Typical import destinations include EU countries, the Middle East (such as the UAE and Saudi Arabia), and Asian markets like China, India and South Korea, especially for oil‑and‑gas, petrochemical and power projects.

What packaging and shipping methods are standard for this product?

Duplex tube is usually packed in wooden crates or steel pallets with moisture‑resistant liners, loaded in 20‑ft or 40‑ft containers, and shipped under FOB or CIF terms depending on the buyer’s preference.

How can a buyer obtain samples of the duplex tube?

Buyers can request short‑length samples (often 1 m) shipped under the agreed Incoterm, accompanied by the mill test certificate for that sample batch. Sample testing helps verify chemical and mechanical compliance before larger orders.