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E235 NBK Status Seamless Cold Drawn Precision Tubing En10305-1

Basic Information
Place of Origin: China
Brand Name: SunShine
Certification: ISO9001
Model Number: 6mm to 114.3mm
Minimum Order Quantity: 5T
Packaging Details: In Bundles, Woodenbox As Your Requirement
Delivery Time: 30days
Payment Terms: L/C, T/T
Supply Ability: 2000T/Month
Detail Information
Keyword: Seamless Tube Standard: DIN 2391 / EN 10305-1 / EN10305-4
Grade: ST35, ST37.4, ST37, ST45, ST52, ST52.4, E235, E255, E355. OD. Range: 3.16mm – 114.3mm
Wall Thickness: 0.5mm-15mm Heat Treatment: +C,+BK,+N,+NBK
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Product Description

E235 NBK Status Seamless Cold Drawn Precision Tubing En10305-1

Tubes according to this standard EN10305-1 are characterized by having precisely defined tolerances on dimensions and a specified surface roughness. Typical fields of application are in the vehicle, furniture and general engineering industries.



EN 10305-1 Chemical composition(%)

Steel grade
C(% max) Si(% max) Mn(% max) P(% max) S(% max)
E215 1.0212 0.10 0.05 0.70 0.025 0.015
E235 1.0308 0.17 0.35 1.20 0.025 0.015
E355 1.0580 0.22 0.55 1.60 0.025 0.015


EN 10305-1 Mechanical and technological properties

Yield strength
(min Mpa)
Tensile strength
(min Mpa)
(min %)
215 290-430 30
235 340-480 25
355 490-630 22


Condition on delivery of EN 10305-1:

Term Symbol Explanation
(cold-finished as-drawn)
BK No heat treatment after the last cold-forming process. The tubes, therefore, have only low deformability.
(lightly cold-worked)
BKW After the last heat treatment, there is a light finishing pass (cold drawing) With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits.
Annealed GBK After the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum.
Normalized NBK The tubes are annealed above the upper transformation point in a controlled atmosphere or under a vacuum.


Products Specification :
Production Standard:DIN 2391/DIN 1629/EN 10305/ASTM A179/JIS G3445
Finished Condition : NBK(+N) / GBK(+A) / BK(+C) / BKW(+LC) / BKS(+SR)
Material: ST35(E235) / ST45(E255) / ST52(E355) / ST37.4


Size Range and Tolerance
OD Size Range (mm) DIN tolerance Special tolerance Special high precision
ø4~30mm ±0.08mm ±0.05mm ±0.03mm
ø31~40mm ±0.15mm ±0.05mm ±0.03mm
ø41~50mm ±0.20mm ±0.08mm ±0.03mm
ø51~60mm ±0.25mm ±0.10mm ±0.03mm
ø61~70mm ±0.30mm ±0.15mm ±0.05mm
ø71~80mm ±0.35mm ±0.20mm ±0.05mm
ø81~90mm ±0.40mm ±0.25mm ±0.05mm
ø91~100mm ±0.45mm ±0.35mm ±0.05mm


Wall Thickness Range DIN tolerance Standard tolerance Special high precision
0.5~15mm ±10% ±5~8% ±5~7%


Size List : all dimensions are by metric.
Ø4×0.5 Ø12×1.5 Ø16×2.5 Ø22×1.5 Ø28×2.0 Ø34×2.0 Ø38×3.0 Ø48×3.5
Ø4×1.0 Ø12×2.0 Ø16×3.0 Ø22×2.0 Ø28×2.5 Ø34×2.5 Ø38×3.5 Ø48×5.0
Ø5×1.0 Ø12×2.5 Ø18×1.0 Ø22×2.5 Ø28×3.0 Ø34×3.0 Ø38×4.0 Ø50×5.0
Ø6×1.0 Ø14×1.0 Ø18×1.5 Ø22×3.0 Ø28×3.5 Ø34×3.5 Ø38×5.0 Ø50×6.0
Ø6×1.5 Ø14×1.5 Ø18×2.0 Ø22×3.5 Ø28×4.0 Ø34×4.0 Ø38×6.0 Ø60×3.0
Ø6×2.0 Ø14×2.0 Ø18×2.5 Ø22×4.0 Ø30×1.5 Ø34×4.5 Ø40×4.0 Ø60×5.0
Ø8×1.0 Ø14×2.5 Ø18×3.0 Ø22×5.0 Ø30×2.0 Ø34×5.0 Ø42×2.0 Ø60×6.0
Ø8×1.5 Ø14×3.0 Ø19×2.0 Ø24×2.0 Ø30×2.5 Ø35×1.5 Ø42×3.0 Ø60×7.0
Ø8×2.0 Ø15×1.0 Ø20×1.0 Ø25×2.0 Ø30×3.0 Ø35×2.0 Ø42×3.5 Ø60×8.0
Ø8×2.5 Ø15×1.5 Ø20×1.5 Ø25×2.5 Ø30×3.5 Ø35×2.5 Ø42×4.0 Ø65×5.0
Ø9×1.5 Ø15×2.0 Ø20×2.0 Ø25×3.0 Ø30×4.0 Ø35×3.0 Ø42×4.5 Ø65×8.0
Ø10×1.0 Ø15×2.5 Ø20×2.5 Ø25×4.0 Ø30×5.0 Ø35×3.5 Ø42×5.0 Ø70×4.0
Ø10×1.5 Ø15×3.0 Ø20×3.0 Ø27×3.0 Ø32×2.0 Ø35×4.0 Ø42×6.0 Ø70×5.0
Ø10×2.0 Ø16×1.0 Ø20×3.5 Ø27×3.5 Ø32×2.5 Ø35×4.5 Ø45×3.0 Ø70×8.0
Ø10×3.5 Ø16×1.5 Ø20×4.0 Ø27×4.0 Ø32×3.0 Ø35×5.0 Ø45×6.0 Ø90×5.0
Ø12×1.0 Ø16×2.0 Ø22×1.0 Ø28×1.5 Ø32×4.0 Ø38×2.5 Ø48×3.0 Ø114×4.0


E235 NBK Status Seamless Cold Drawn Precision Tubing En10305-1 0  E235 NBK Status Seamless Cold Drawn Precision Tubing En10305-1 1  E235 NBK Status Seamless Cold Drawn Precision Tubing En10305-1 2



Q: What product information must I provide before making a purchase?
Please provide the grade, width, thickness, and surface treatment requirements, as well as the quantities you require.

Q: What shipping ports are there?
We normally ship from Shanghai,Tianjin, Qingdao, and Ningbo ports

Q: Is it possible to send samples?
Of course, we offer free samples and express shipping to customers all over the world.

Q: Do you offer a service for customized products?
Yes, we can produce according to your specifications and drawings.

Q: Can I pay you a visit at your factory?
Customers from all around the world are welcome to visit our factory.

Q: Can you assist me in importing steel products for the first time?
Yes, we have shipping agent who will arrange the shipment with you.

Q: Do you have any MOQ limit for production?
We don’t have any MOQ limit. But as for our steel pipe product, we usually use container transport for lower freight. In the case of express delivery, high freight charges will be generated.

Q: Is it OK to print my logo on the product or the carton packing?
Yes. Please inform us formally before our production and confirm the design firstly based on our sample.

Q: How to pack the product?
The inner layer has a waterproof paper outer layer, iron packaging, and is fixed with a fumigated wooden pallet. It
can effectively protect products from corrosion during ocean transportatio

Contact Details

Whatsapp : +8613961408918