NF A49-341 Precision Welded Low-Alloy Steel Pipe (TS30o / TS30a / TS34a / TS7a / TS42a) 

Material Description

This product is a precision welded low-alloy steel pipe manufactured under the French NF A49-341 standard. It is intended for mechanical applications, where dimensional accuracy, weld seam quality, and mechanical strength are essential. Because it is “precision welded,” the manufacturing process is optimized to produce tight tolerances, minimal defects, and consistent cross-sectional geometry.

Specification

• Product Type: Welded steel tube / pipe for mechanical use

• Standard: NF A49-341 (“Steel Tubes Precision Welded Tubes for Mechanical Application”) 

• Grades / Designations: TS30o, TS30a, TS34a, TS7a, TS42a (and sometimes TS47a in the NF series) 

• Typical Outer Diameters and Wall Thicknesses: According to standard NF A49-341

• Manufacture: Welded (precision, likely high-frequency welding, possibly followed by finishing)

Chemical Composition

Mechanical Properties

Main Features

• Dimensional Precision & Tight Tolerances: Because this is a “precision welded” tube product, geometry, straightness, and roundness are strictly controlled.

• Good Mechanical Strength: The specified low-alloy grades provide higher yield and tensile strength than mild carbon tubes, making them suited for load-bearing mechanical parts.

• Weld Quality: The welding seam is designed to be smooth, minimally intrusive, and free of defects (cracks, inclusions) as required by mechanical-use applications.

• Good Ductility & Toughness: Adequate elongation and reduction of area allow some degree of deformation and stress redistribution under load.

• Heat Treatment Compatibility: These grades may allow mild heat treatments (e.g. normalizing or annealing) to refine microstructure or relieve stresses, provided not to degrade dimensional accuracy.

• Low Alloy Content: The alloying is modest, intended to improve mechanical properties without significantly increasing cost or complicating welding behavior.

Applicable Standards

• NF A49-341: The primary standard for precision welded tubes for mechanical use in France. 

• ASTM / International Equivalents: There is no direct ASTM equivalent listed in the NF document, but similar mechanical tubing standards (for carbon/alloy welded mechanical tubes) might be ASTM A513 or ASTM A519, though those differ in application scope.

• ISO / EN / GOST: The NF standard is specific to French NF A49; cross-referencing to EN or ISO mechanical tubing standards may be possible but must be validated case by case.

• Other NF A49 Standards: The NF A49 series includes related norms (e.g. NF A49-343, NF A49-145) which govern other welded tube types. 

If a particular ISO or EN designation is required (for cross-border trade), I can check equivalents.

Application Fields

In general, NF A49-341 precision welded tubes are used in mechanical engineering / machine construction / mechanisms. More specifically:

• Machine Components: shafts, rods, guide tubes, cylindrical supports

• Automation & Robotics: linear actuators, piston rods, telescopic members

• Automotive / Vehicle Systems: steering link, stabilizer rods, suspension structural tubes

• Hydraulic / Pneumatic Lines (in non-pressure roles): structural mounting tubes, protective sleeves

• Assembly Fixtures & Tooling: jigs, test rigs, support arms

Q: Are you trading company or manufacturer ?

A: manufacturer,also can do trading.

Q: How long is your delivery time?

A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock,

it is according to quantity.

Q: Do you provide samples? is it free or extra ?

A: Yes, we could offer the sample for free charge but need pay the cost of freight.

Q: What is your terms of payment ?

A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.

If you have another question, pls feel free to contact with me.