Production

Standard

DIN 2391/EN 10305/GB/T8162/ASTM A519,etc.

Out Diameter

30mm-250mm

Wall Thickness

2mm-30mm

Material

10#-45#,st35-st52,q345,25Mn

 Length

According to the customer’s acquirement

Surface treatment

According to the customer’s need

 Technique

Seamless & welded

 Usage

 1.  hydraulic cylinder

 2.  automobile

 3.  oil drilling

 4.textil machinery

 5. printing machinery

 6.  engineering machinery

 Package

 1.  Bundle packing.

 2.  Bevelled end or plain end or warnished as per buyer's required.

 3.  Marking: as per customer's requests.

 4.  Painting varnish coating on the pipe.

 5.  Plastic caps at ends.

 Supply

 1.  seamless steel pipe

 2.  cold drawn seamless steel tube

 3.  hydraulic cylinder steel tube

 4.  DOM  tube

 5. SRB/honed steel tube

 6.  hot rolled seamless steel tube

 7.  cold rolled seamless steel tube

Min Order Quantity

According to customer's requirement

Payment terms

L/C, T/T, 

Contact

If you have any questions, please feel free to contact me.

Steel grade

Chemical composition,%

C

Si

Mn

P

S

Cr

≤

St45 (20#)

0.17-0.24

0.17-0.37

0.35-0.65

0.035

0.035

0.25

ST52(E355)

≤0.22

≤0.55

≤1.6

0.025

0.025

0.25

SAE1026

0.22-0.28

0.15-0.35

0.6-0.9

0.04

0.05

/

STKM 13C

≤0.25

≤0.35

0.3-0.9

0.04

0.04

/

Q345B

≤0.2

≤0.5

1.0-1.6

0.03

0.03

0.30

CK45

0.42-0.50

0.17-0.37

0.5-0.8

0.035

0.035

0.25

Delivery 
condition

cold finished(hard)(BK)

Cold drawn and stress-relieved(BK+S)

Steel grade

Rm MPa

Elongation
A5(%)

Rm MPa

ReH MPa

Elonggation
A5(%)

St45

≥550

≥5

≥520

≥375

≥15

20#

≥550

≥8

≥520

≥375

≥15

St52 (E355)

≥640

≥5

≥600

≥520

≥14

SAE1026

≥640

≥5

≥600

≥510

≥15

STKM 13C

≥550

≥8

≥520

≥375

≥15

Q345B

≥640

≥5

≥600

≥520

≥14

CK45

≥640

≥5

≥600

≥520

≥10

ID size

ID deviation (mm)

H7

H8

H9

30

+0.021

0

+0.033

0

+0.052

0

>30~50

+0.025

0

+0.039

0

+0.062

0

>50~80

+0.030

0

+0.046

0

+0.074

0

>80~120

+0.035

0

+0.054

0

+0.087

0

>120~180

+0.040

0

+0.063

0

+0.100

0

>180~250

+0.046

0

+0.072

0

+0.115

0

>250~315

+0.052

0

+0.081

0

+0.130

0

>315~400

+0.0527

0

+0.089

0

+0.140

0

1.100% PMI,Spectro Chemical Aanlysis Test for Raw Material

2.100% Dimension & Visual Examination 

3. Mechanical Properties Test Include Tension Test,Flaring Test (For Seamless tube/pipe)/ Flange Test (For Welded Pipe & Tube), Hardness Test ,Reversed Flattening Test

4.100% Hydrostatic Test or 100% NON-DESTRUCTIVE Test  (ET or UT) 

5.Radiographic Test for Welded Pipe (shall be accordance with specification,or shall be as agreed upon between the purchaser and vendor)

6.Straightness Test  (optional)

7.Roughness Test (optional)

8.Intergranular Corrosion Test(optional)

9.Impact Test (optional)

10.Grain Size Determinations (optional)

NOTES : ALL THE TESTS AND INSPECTION RESULT NEED TO BE SHOWED IN REPORTS ACCORDING TO STANDARD AND SPECIFICATION.

     Application

Cold drawn or cold rolled precision seamless steel tubes for hydraulic pressure and pneumatic services.

For Auto use,machinery use,oil cylinder tube,motorcycle shock reducer use,auto shock reducer inner cylinder,gas spring use etc.

Seamless steel pipes for low and medium pressure boiler, high pressure boiler, ship-building,Liquid service, petroleum cracking, chemical fertilizer equipment,Drawing-oil-equipment and structure purposes.