• Jiangsu Hongbao Group Co., Ltd.
    A good collaboration!
  • Jiangsu Hongbao Group Co., Ltd.
    It could provide professional solutions for application of titanium tubes, reliable partner.
Contact Person : Angela
Phone Number : 86-512-58715276
Whatsapp : +8615895686919

Mechanical Structures Cold Drawn Seamless Tube Round Black 32mm Wall Thickness

Place of Origin Jiangsu, China
Brand Name Hongbao
Certification TS16949,DNV,PED,ISO,TUV,LR
Model Number HBHST-1
Minimum Order Quantity 1 ton
Price Negotiable
Packaging Details Original packaging according to the customers Export standard package in bundled or as required.
Delivery Time within 50 days
Supply Ability 30000MT per year

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Whatsapp:0086 18588475571

Wechat: 0086 18588475571

Skype: sales10@aixton.com

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Product Details
Brand Hongbao Certificate TS16949,DNV,PED,ISO,TUV,LR
Material ST37.4,ST52.4,E235,E355,26MnB5,34MnB5 OD 6-120mm
Thickness 0.5-15mm Length 12000mm Max
Shape Round Type Welded Or Seamless
High Light

hollow steel bar


round hollow tube

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Product Description

Hollow Steel Tube Round Black Precision Steel Pipe For Autos



Material Carbon Steel DIN 2391 Standard St 35, St45, St52
EN 10297-1 Standard E235, E275, E315, E355, E470
EN 10305-1 Standard E215, E235, E355
EN 10305-4 Standard E215, E235, E355
BS 6323-3 Standard HFS 3, HFS 4, HFS 5, HFS 8
DIN 2391 Standard St 35, St45, St52
EN 10297-1 Standard E235, E275, E315, E355, E470
EN 10305-1 Standard E215, E235, E355
NF A49-311 TU 37-b, TU 52-b, TU 56-b, TU XC35
Alloy Steel ASTM A519 Standard 1345, 3140, 4130, 4135, 4140, 4150, 4320, 4340, 5120, 5130
JIS G3429 Standard STH11, 12 STH21, 122 STH31
JIS G3441 Standard SCR420TK, SCM415TK, SCM418TK, SCM420TK, SCM430TK, SCM440TK




  Size Range Tolerance
OD 6-325mm -0.035 -- +0.045mm
ID 2-250mm ±0.035mm
WT 1-32mm depends on sizes
Length random or fixed length +0-3.5mm
Straightness 0.15:1000, 0.4:1000, 0.5:1000 1:1000 or customized
Surface Roughness Ra 0.02—0.4μm





































Our company main product all kinds of cold drawn precision welded steel tube and hydraulic precision cylinder tube. We have about 30 years experience of the steel production.


Widely used in Machinery, Automotive & Aerospace Industry,Bicycles.

Other mechanical parts and structures and so on.

Delivery condition of seamless cold drawn mechanical tubing

  1. BK (+C) Cold finished/hard (cold finished as drawn).
  2. BKW (+LC) Cold finished/soft
  3. BKS (+SR) Cold finished/stress relieve annealed.
  4. GBK (+A) Annealed.
  5. NBK (+N) Normalized.

Round Cold Drawn Welded Precision DOM Steel Tube are manufactured according to technical specification of EN10305-2 Cold Drawn Welded Precision Steel Tubes DOM tubing, with steel grade of E155,E195,E235,E275,E355 and delivery conditions of +C +LC +SR +A +N