EN 10305-3 28Mn6 Welded Cold-Sized Carbon Steel Tube with 30 - 426 mm Outer Diameter for Precision Applications
Product Details
Cold Sized Carbon Steel Tube
,Tight Tolerances Precision Steel Tube
,Good Mechanical Strength Welded Cold-Sized Tube
EN 10305-3 / 28Mn6 Welded Cold-Sized Carbon Steel Tube for Precision Applications
Material Overview
EN 10305-3 (Welded Cold-Sized Tubes) defines the technical delivery conditions for welding cold-sized steel tubes used in precision applications.
“28Mn6” (steel number 1.1170) is a heat-treatable, manganese-containing carbon steel grade commonly used in mechanical and automotive applications.
When used in welded cold-sized tubes under EN 10305-3, 28Mn6 provides a balance of strength, formability, and weldability, making it suited for structural and precision uses.
Specifications
Below is a representative (“typical”) specification summary (not a full standard text):
-
Product Type: Welded cold-sized (i.e. welded and then cold reduced for precise tolerance) steel tubes (circular, square, rectangular cross-sections)
-
Maximum Outside Diameter (circular): up to 193.7 mm according to the standard scope
-
Tolerance & Surface Roughness: tight dimensional tolerances and a maximum permitted surface roughness (not freely given in summary sources)
-
Heat-treatment / Delivery Conditions: as-welded, cold-sized, optionally normalizing, annealing, or quench & tempering depending on requirements and grade
-
Typical Wall Thickness / Lengths: common ranges (e.g. wall thickness from ~0.5 mm upward, standard lengths typical per manufacturer)
Chemical Composition (Typical / Standard Limits)
| Steel Grade | C (wt %) | Si (max) | Mn (range) | P (max) | S (max) |
|---|---|---|---|---|---|
| 28Mn6 (1.1170) | 0.25 – 0.32 | ≤ 0.40 | 1.30 – 1.65 | ≤ 0.035 | ≤ 0.035 |
| C35E (EN) | ~0.32 | ~0.40 | ~0.80–1.20 | ~0.025 | ~0.025 |
| E235 (EN 10305 series) | ~0.17 (max) | ~0.35 | ~1.20 (max) | ~0.025 | ~0.025 |
| E355 (EN 10305 series) | ~0.22 (max) | ~0.55 | ~1.60 | ~0.025 | ~0.025 |
| E420 (EN 10305 series) | ~0.16 (max) | ~0.50 | ~1.70 | ~0.025 | ~0.025 |
Mechanical Properties
| Grade / Condition | Yield Strength (Rp0.2) (MPa) | Tensile Strength (Rm) (MPa) | Elongation A5 (%) | Reduction of Area Z (%) | Notch Impact (ISO-V) J |
|---|---|---|---|---|---|
| 28Mn6 (Normalized) | 345 (≤16 mm) | ≥ 630 | ≥ 17 % | — | — |
| 28Mn6 (Quenched & Tempered) | ~590 | 800–950 | ≥ 13 | ~40 | min 35 J |
| C35E (typical structural steel) | ~215–300 (varies with condition) | ~400–600 | ~15–20 | — | — |
| E235 (as delivered in EN 10305) | ~315 | ~390 | ~25 | — | — |
| E355 (EN 10305) | ~355 | ~490–630 | ~22 | — | — |
| E420 (EN 10305) | ~420 | ~540–630 | ~22 | — | — |
Main Characteristics
-
Precision dimensional control: after welding, the tube is cold-sized (reduced) to tight tolerances in outer diameter, wall thickness, straightness, and roundness as per EN 10305-3.
-
Good mechanical strength: 28Mn6 can deliver moderate to high strength, especially when heat-treated.
-
Good formability: in softer conditions, it can be cold-formed, bent, or flanged.
-
Weldability: acceptable weldability, though care must be taken in processing and potential post-weld treatment.
-
Surface quality: a defined maximum surface roughness is required by the standard to ensure compatibility in precision applications.
-
Versatility in heat treatment: it supports normalizing, quenching & tempering, annealing, providing flexibility to tailor property ranges.
Compliance / Applicable Standards
-
EN 10305-3:2023 — Steel tubes for precision applications, technical delivery conditions for welded cold-sized tubes.
-
Earlier versions: EN 10305-3:2016 / 2010 / 2002
-
The tube must also satisfy general steel product delivery standards and reference standards such as EN 10020, EN 10021, EN 10027, EN 10204, EN 10266, and testing standards like EN 10246-3 (eddy current testing of tubes).
-
The standard is applicable for outside diameter ≤ 193.7 mm (for circular cross-section) and can also be extended to square/rectangular tubes.
Application Domains
Broad Application Fields
This tube is suited for precision structural, mechanical, and assembly use in fields such as automotive systems, machinery, furniture frames, mechanical instrumentation, and assembly jigs.
Specific Use Cases
| Application Field | Typical Use of 28Mn6 Welded Cold-Sized Tube |
|---|---|
| Automotive & Vehicle Frames | Structural cross-members, reinforcement struts, chassis tubular frames |
| Mechanical Equipment / Automation | Precision frames, guide rails, supports, sensor housings |
| Furniture & Fixtures | Slim, high-strength frame members or supports |
| Conveyance & Handling Systems | Light rails, rollers, guiding tubes |
| Instrumentation / Laboratory Equipment | Enclosures, shafts, tubes requiring controlled tolerances |
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.
-
Auto Parts ASTM A513 Cold Rolling Welded Steel Tubes with DOM Production
Auto Parts ASTM A513 Welded Steel Tubes with DOM production ASTM A513 Electric-Resistance-Welded Carbon and Alloy Steel Mechanical Tubing Applications: for Machinery, Mechanical Engineering 1. Standard: ASTM A513 cold rolling welded precision steel tubes 2. Steel Grade: SAE1010, SAE1020, other materials upon agreement with customers. 3. Production method: Cold rolling on the weled steel tubes, to reach high accuracy on the OD and WT tolerance 4. Size range: O.D.:6-350mm W.T. -
25mm Diameter Bright Annealing Seamless Steel Tube for Hydraulic Systems
EN10305-1 E235 E355 NBK Bright Annealing Precision Steel Pipes for Hydraulic Systems EN10305-1 NBK Bright Annealed Precision steel pipes for Hydraulic system OD:4-80 (mm) WT0.5-10 (mm) Length 1000-12000mm Product name: Seamless Precision Steel Pipe Application: for hydraulic systems precision steel pipes for Hydraulic system OD (mm) WT (mm) Length (mm) 4 0.5 5800-6000 4.0 1.0 5800-6000 5.0 1.0 5800-6000 6.0 1.0 5800-6000 6.0 1.5 5800-6000 8.0 1.0 5800-6000 9.5 0.89 5800-6000 -
Precision Seamless Black Phosphating Steel Tube for Hydraulic Systems
Steel Pipes with high precision for Hydraulic Systems with Black Phosphating surface Black Phosphated Hydraulic Tubes with High Precision and tight tolerance, the tubes are produced by precision cold drawn and cold rolling, then bright annealed in a protected atmosphere, afterwards it is blackphosphated on the surface Production process: DIN series tubes, cold drawn and bright annealed precision seamless steel tube is used as the tube to be phosphated. The phosphorization is -
Precision Seamless Galvanized Steel Tubes DIN2391 EN103052 ST35.0 ST37
Precision Seamless Galvanized Steel Tubes DIN2391 EN103052 ST35.0 ST37 Production Process: Cold rolling by Cold pilger machine and Cold rolling machine,galvanized and zinc plated could be applied. Cold Rolled and Galvanized Steel Tube Production process: DIN highly accurate, cold rolled and bright seamless steel tube is used as the tube to be galvanized. The outer wall of tube is electroplated. The caps are covered at two ends of tube to prevent from the dust. Main Features:
