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Company Info
Zhangjiagang Shengdingyuan Pipe-making Co.

Street Address: Gaoqiao Industial Park, Houcheng, Jingang Town, Zhangjiagang City

City: Suzhou

Province: Jiangsu

Country/Region: China

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China Automotive Tubes EN10305-1 E255 NBK

China Automotive Tubes EN10305-1 E255 NBK

Typical Clients:  Volkswageon

Market Type:  OE Market

Place of origin:  CHINA

Product Attribute:

Material:Steel

Typical Clients:  

Volkswageon

Production Description:

l Automotive Tube diamensions for the automotive industry 
Outside diameter ranges from 4 to 60 mm and wall thickness ranges from 0.5 to 7mm. Precision steel tubes are delivered according to and 
l TOLERANCE TABLE OF STEEL TUBE


NAME 
SCOPE(mm) GB (mm) DIN (mm) Enterprise control(mm) Special high-precision(mm) 
OD              Out Diameter 4-30 ±0.1 ±0.08 ±0.05 ±0.03
31-40 ±0.15 ±0.15 ±0.05 ±0.03
41-50 ±0.20 ±0.20 ±0.08 ±0.03
51-60 ±0.25 ±0.25 ±0.08 ±0.03
Wall thickness   0.5-7 ±10%,Min±0.12 ±10% ±10%,Min±0.05 ±10%,Min±0.03
 Steel grades and chemical composition for EN10305-1 automotive tubes


Chemical composition(cast analysis)a
Steel grade % by mass
Steel name Steel number C Si Mn P Sb AI
max. max. max. max. max. min.
E215 1.0212 0.10  0.05  0.70  0.025  0.025  0.025 
E235 1.0308 0.17  0.35  1.20  0.025  0.025  -
E355C 1.0580  0.22  0.55  1.60  0.025  0.025  -

l Mechanical prorperties for EN10305-1 automotive tubes

Mechanical properties at room temperature
Steel grade Minimum values for the delivery condition
Steel name Steel number BK BKW BKS GBK NBK
Rm A Rm A Rm ReH A Rm A Rm ReH A
MPa % MPa % MPa MPa % MPa % MPa MPa %
 ST35 1.0305 480 6 420 10 420 315 14 315 25 340 to 470 235 25
ST45 1.0408 580 5 520 8 520 375 12 390 21 440 to 570 255 21
ST52 1.0580  640 4 580 7 580 420 10 490 22 490 to 630 355 22


l Delivery condition and heat treatment processing of precision tubes for the automotive industry


Delivery Condition
Heat treatment process 
+C Cold drawn/hard.After the last cold forming,no heat treatment.
+LC Cold drawn/soft.After the last heat treatment follows the cold drawing there is a light finishing pass.
 
+SR Cold drawn and stress relieved annealed. After the final cold drawing process the tubes are stress relieved annealed in a controlled atmosphere.
+A After the final cold drawing process the tubes are stress relieved annealed in a controlled atmosphere.
+N Normalized. After the last cold drawing process the tubes are annealed in a controlled atmosphere.

l Length of precision tubes for the automotive industry
random length precision tubes in the range of 3  10 m
approximate length with tolerance +/-10 mm

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