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)

Mechanical Properties

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

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.

Who We are ?

-------A professional steel pipes materials inventor, manufacturer and solution provider
Torich International Limited is a professional manufacturer and exporter of steel pipes materials. It is an international marketing and sales company specialized in steel tubes, which holds the factories of Seamless Steel Tubes with Carbon and Alloy Steel Grade, Welded Precision Steel Tubes,DOM Steel Tubes, Seamless & Welded Stainless Steel Tubes with Nickel and Alloy Steel Grade.
Our factory was established since 1997, with the name of TORICH INTERNATIONAL LIMITED. The factories’ technicians are of great engineering experience in steel pipe industry for more than 20 years, which are in great command of production technology for Cold Drawing and Cold Rolling. So we have strong technician team and manufacturing capability.

What products we do?

------- Invent and produce various Precision Steel Pipes

Our steel pipes cover the following ranges:
Seamless Precision Steel Pipes

Bearing Steel Tubes
Welded Precision Steel Pipes, with DOM production
Seamless Heat Exchanger Steel Pipe
Seamless Boiler Steel Pipes

Honed Tubes

Hydraulic Cylinder Steel Tubes

Hydraulic Telescopic Cylinder Tubes
Seamless Structural Steel Pipes
Seamless Mechanical Steel Pipes
Seamless Alloy Steel Tubes & Pipes
Seamless Stainless Steel tubes
Welded Stainless Steel Tubes
Seamless Stainless Steel Tubes & Pipes
Welded Stainless Steel Tubes & Pipes
Seamless Carbon Steel Tubes & Pipes
Nickel Alloy Steel Tubes & Pipes

What TORICH do:
1. Producing Steel Tubes
2. Selling both on Domestic and International Market
3. Precisely Targeting Customers’ Requirement- Sourcing the right factory for right products for Customers

Products Application:
Oil Cylinders
Air Cylinder, 
Automotive Cylinder Liners
Boilers, Pressure Vessels
Shell & Heat Exchangers
Jack Lifting
Telescopic Systems
Pneumatic Cylinders
Agricultural Machineries

Size range is: 
O.D. 4-350mm, 
W.T. 0.5-30mm, 
Length: according to customer’s requirement and agreement
 

Steel Grade:
Carbon Steel Grade:
ST35.8, ST37.0, ST44, ST52;
E155, E195, E215, E235, E275, E355;
195GH, P235GH, P265GH, P195TR1, P195TR2, P235TR1, P235TR2, P265TR1, P265TR2;
SAE1010, SAE1020, SAE1026, SAE1035, SAE1045;

Carbon steel tube: SA178, A179, A192, A210, SA213, SA214, etc.
Alloy Steel Grade:
T2, T5, T9, T11, T12, T17, T21, T22, T91,T92, 15Mo3,16Mo3, 13CrMo44;
SAE4130, SAE4140, 40Cr, 40Cr4, 10CrMo910, 12CrMo910, 11CrMo910,
25CrMo4, 35CrMo, 35CrMo4, 42CrMo4, 34CrMo4, 20MnV, 20MnV6,20CrMn;
Carbon steel tube: A179,A192,A210,DIN17175,etc.

Bearing Steel Grades:
GCr15 52100 suj2 suj3 100Cr6 SKF3S SKF3S 20CrNiMo 8620H 4118H;

Nickel Alloy Grade:
N02200/2201, N04400, N06600, N06601, N06625, N06852, N06219, N06690, N08800/8810/8811, N08825, N08028, N08535, N08904, N08925, N08926, N010276, N06022, etc.

Austenitic/Super Austenitic Stainless Steel Grade:
304/304L, 316/316L, 314, 321, 347H, 316Ti, 316LMod, 317L/N, 310S, 253MA, 330, 904L, S31254, XM-19, etc. 

Ferrite/Martensite Stainless Steel Grade:
TP410, TP405, TP420, TP430, TP430Ti, TP403, TP409, TP444, TP439, TP446, etc. 

Duplex/Super Duplex Stainless Steel Grade:
S31803, S32304, S31500, S32550, S32750, S32760, etc. 
Corporate Culture:
We focus on Quality First, Quality Traceability, and Quality Stability!
We focus on Customer First, People First, and Quality-Oriented!
Success:
First factory started in 1997, in the name of Torich , now covers 50000 square meters of factory building, with more than 100employees, and over 45 million RBM assets.
In 2008, we started the company of Torich International Limited for international business and marketing.
Welcome partners from all over the world for long term cooperation!