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Hangzhou Matech Steel Company Limited
Tel: +86-571-28350111
Fax: +86-571-86693517
Email: sales@matech-steel.com
Add: Floor 10, Xixi Vally E-Building, Xihu District, Hangzhou, Zhejiang province, China
Seamless Precision Steel Tubes

Seamless Precision Steel Tubes

Seamless Precision steel tubes The seamless precision steel tubes can be used for a wide range of precision mechanical spare for car and cylinder accord to standard: · DIN 2391 · EN10305-1 · DIN17175 etc; + Precision cold drawn steel tube production process Material: ST35,ST45,ST52. + Double...

Seamless Precision steel tubes

The seamless precision steel tubes can be used for a wide range of precision mechanical spare for car and cylinder accord to standard:

· DIN 2391

· EN10305-1

· DIN17175 etc;

图片21.png

+ Precision cold drawn steel tube production process

Material: ST35,ST45,ST52.

图片22.png

+ Double tube, Double wall steel tube

Manufacturing method: cold-rolled / cold-drawn 
Delivery condition: BK,BKS,SR,GBK,NBK.

Certificate 
Factory Certification: 2.2 according to EN 
Acceptance Test Certificate:3.1 according to EN 10204 

Packing: in bundles tied with steel strips. 
External packing by wooden cases if the wall thickness/OD ratio is low. 
Oil-coating is generally necessary especially for export.

Application: 
Used in hydraulic & pneumatic cylinder ,automobile and other mechanical device.

Feature: 
high precision and high brightness, the inner and outer surface of the tubes have high cleanness without oxid, mechanical properties of the final tubes also come out excellent, promising no leakage under high pressure, no deformation after cold-bent and no cracks when flaring and flattening, ensuring the efficient operation in all service.

NBK means protective heat-treating under the non-oxidation enviroment to get a bright and smooth surface for the tubes. ?

DIN 2391-81 Part 2 Seamless Precision steel tubes(DIN2391-81)

Standard DIN 2391 defines the technical delivery conditions for seamless precision steel tubes according to DIN 2391 Part 1 which are made from the steel grades listed in section 5.
Tubes according to this Standard are mainly used where accuracy to dimension and, possibly, small wall thicknesses and good surface condition are required.

Chemical composition(%)

Code
number

Material number

Mfg. Process

C
max

Si
max

Mn
max

P
max

S
max

St35

1.0308

S

0.17

0.35

0.4

0.05

0.05

St45

1.0408

S

0.21

0.35

0.4

0.05

0.05

St52

1.0508

S

0.22

0.55

1.6

0.05

0.05

Mechanical and technological properties

Code number

Material number

Cold-finished hard(BK)

Cold-finished/soft (BKW) 3)

Rm(Mpa)

A(%)

Rm(Mpa)

A(%)

St 35/E235

1.0308

480

6

420

10

St 45

1.0408

580

5

520

8

St 52/E355

1.0508

640

4

580

7


Code number

Cold finished (soft)(BKW)

Annealed (GBK)

Normalized (NBK)

Rm(Mpa)

ReH (Mpa)

A(%)

Rm(Mpa)

A(%)

Rm (Mpa)

ReH (Mpa)

A(%)

St 35/E235

420

315

14

315

25

340-470

235

25

St 45

520

375

12

390

21

440-570

255

21

St 52/E355

580

450

10

490

22

490-630

355

22

Note:

· The yield point for the annealed (GBK)condition on delivery is at least 50% of the (ultimate) tensile strength.

· Depending upon the degree of deformation in the drawing operation, the yield point of tubes delivered in the cold-finished/hard (BK)and cold-finished/soft(BKW) conditions, may be increased to a level close to the tensile strength.

· In calculating the yield point, the following values are recommended : cold-finished/hard condition on delivery ≥ 80% of the tensile strength, cold-finished/soft condition on delivery ≥ 70% of the tensile strength.

Quality grade

The tubes are supplied in the following quality grades :

A) precision steel tubes intended primarily for mechanical stressing, without any particular quality requirement and without acceptance test certificate.
B) precision steel tubes intended primarily for mechanical stressing, with special quirement and exclusively with acceptance test certificate.
C) precision steel tubes with special requirement according to section 12. Theses requirements and corresponding tests must be agreed, with the customer having to specify his requirements at the time of enquiry and on ordering.

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    Hangzhou Matech Steel Company Limited
    Tel: +86-571-28350111
    Fax: +86-571-86693517
    Email: sales@matech-steel.com
    Add: Floor 10, Xixi Vally E-Building, Xihu District, Hangzhou, Zhejiang province, China
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