St52.0 Seamless Carbon Steel Round Pipe & W-Nr.1.0421 Steel Tube

Product Description

Think of St52.0 as the dependable backbone in a system that cannot fail. The graphite-black mill finish gives way to a satin-smooth bore; tap the tube and you’ll hear a clean, straight ring—evidence of uniform wall integrity. Built through a seamless route, St52.0 delivers a strong yield platform with generous elongation, so your fabrications absorb shock rather than crack. Weldability stays friendly across common processes, and the steel cold-forms without drama. In service, that translates to tighter bends, cleaner weld roots, and fixtures that align the first time—less grinding, fewer do-overs, safer pressure tests.

A bridge contractor swapped a mixed lot of structural tubing for a single-spec St52.0 program. The result was predictable fit-up, lower purging time, and one fewer night shift on the launch schedule. Same crews, same jigs—better steel, better rhythm.

Product Parameters

Features & Highlights

• Performance headroom: 355 MPa minimum yield (≤16 mm) with tensile up to 650 MPa allows thinner walls without compromising safety factors—lighter spools, easier lifts.

• Process-friendly: Excellent weldability and consistent chemistry reduce spatter and rework; smooth ID lowers frictional losses in hydraulic and utility lines.

• Dimensional discipline: Tight OD/WT control and straightness give you truer jigs and faster fit-up; fewer shims, fewer field adjustments.

• Reliability at scale: Seamless structure resists localized thinning around bends and manifolds, improving lifecycle in cyclic-pressure duty.

• Paperwork that travels: MTC EN 10204 3.1, heat-number traceability, and optional third-party witnessing fit EPC and OEM documentation packs.

• Service agility: Cut-to-length, beveling, deburring, and kit packing shorten your fabrication critical path.

  
  

Standards, Chemistry & Mechanics

Standards & Grades: DIN 1629 St52.0 (W-Nr. 1.0421), with St37.0 / St44.0 available for lower stress envelopes.

Chemical Composition (cast analysis, % max):

Mechanical Properties (room temperature):

Note: Property windows adjust with wall thickness and delivery condition; impact values available on request.

Manufacturing, QA & Testing

• Routes: Hot-rolled or cold-drawn seamless; optional normalizing or stress-relief to stabilize dimensions after heavy forming.

• End Finishes: Plain ends or beveled; square-cut and deburred to protect seals and gasket faces.

• NDT & Pressure: Hydrostatic test, ultrasonic, radiography, PMI, and Charpy impact available per project ITP.

• Traceability: Heat number carried through bundles; stencil marking includes spec/grade/OD-WT/length/heat.

• Certificates: EN 10204 3.1 standard; 3.2 with third-party witness available.

• Tolerances: OD/WT/straightness per DIN practice for seamless structural/pressure-duty tubes.

  
  

Applications & Industries

• Mechanical & Fabrication: Jigs, frames, shafts, cylinders—where superior yield and elongation simplify forming and extend fatigue life.

• Process & Utilities: Compressed air, water, nitrogen, hydraulics; clean ID supports laminar flow and stable pressure test curves.

• Infrastructure: Bridge trusses, temporary works, launching noses—high specific strength with predictable weld behavior.

• Energy & Plant: Balance-of-plant pipework, supports, and manifolds where documentation and NDT are mandatory.

• Mobility & Heavy Equipment: Axles, booms, outriggers; good cold-bend response with consistent wall across tight radii.

  
  

Supply, Logistics & Commercials

• Availability: Stock supported for mainstream diameters; monthly capacity 20,000 t for call-offs and frame agreements.

• MOQ & Lead Time: MOQ starts at 5 t; RTS/stock options for urgent jobs; customization lead times planned per cut list and NDT scope.

• Trade Terms & Payment: Flexible Incoterms (EXW/FOB/CIF, etc.), payments via T/T, L/C, or PayPal as appropriate.

• Packing & Protection: Hexagonal bundles with steel straps, end caps, rust-preventive oil; export-grade waterproof wrapping and wooden supports.

• Documentation Pack: CO, PL, BL, MTC 3.1, packing list, and inspection records; project-specific data books on request.

  
  

Why Choose Us

• Risk-reduction by design: Seamless quality, documented properties, and process-ready ends mean fewer line-stoppages and smoother commissioning.

• Total-cost lens: Dimensional accuracy and ready-made processing (cutting/beveling/kitting) compress your fabrication schedule and crane hours.

• Responsive capacity: 20,000 t/month and a stocked core range let you pivot mid-project without rewriting timelines.

• EPC-grade compliance: Traceability, 3.1/3.2 certification, and third-party witnessing align with owner-operator specs.

• Partnership model: Dedicated technical support to match grade, delivery condition, and NDT to your duty cycle—not just a price list.

  
  

FAQ

Q1. Is St52.0 suitable for welding and cold forming?

Yes—its low carbon and balanced Mn/S levels yield excellent weldability and forming. Preheat/interpass guidance can be provided for thicker walls.

Q2. Can you supply matching elbows/fittings?

We can machine or source components to your BOM and deliver as kitted sets with common heat numbers for simpler traceability.

Q3. What test scope do you recommend for pressure service?

For critical lines: hydrostatic + 100% UT of weld-affected zones post-fabrication; add RT for suspect geometries. Impact testing per temperature class on request.

Q4. How do you control dimensional accuracy on long lengths?

Process control plus straightness checks per lot; cold drawing and post-forming stress relief are available where tight GD\&T is required.

Q5. Can you meet project document control?

Yes—MTC 3.1 with heat traceability is standard; 3.2 with third-party witness and a full data book is available.