E355+SR (EN 10305-1) / St52-3 BK+S (DIN 2391) High quality cold drawn tubes, with a wide dimension range for telescopic hydraulic cylinders. It has same properties as normal coated rod with the chrome coating on the outer surface. It reduces your system weight 50%-60% due to the hollow design.

Equivalent Standards

EN 10305-1	Material No.	DIN 2391	STAS	AFNOR	BS	UNI EN 10025	JIS	GOST 19281-89	AISI SAE ASTM
E355	1.0580	St52-3	OL52-3	E36-4	4360-50D	Fe510	SM490A	17G1S	1024

Technical Specifications
Steel Grade	E355 (EN 10305-1) / St52-3 (DIN 2391)
Heat Treatment	+SR (EN 10305-1) / BK+S (DIN 2391)
Diameter Range	Ø20xØ30 mm to Ø105xØ125 mm
Tolerance Class	ISO f7
Standard Lengths	5 – 7 meter (Upon request, can be produced in special lengths.)
Inside Surface Roughness	Ra ≤ 0.2 µm
Chrome Layer Thickness	min. 20 µm
Chrome Layer Hardness	min. 900 HV (0,1)
Straightness	max. 0.2 mm : 1000 mm

ISO Tolerances

Ø	> 18 mm ≤ 30 mm	> 30 mm ≤ 50 mm	> 50 mm ≤ 80 mm	> 80 mm ≤ 120 mm	> 120 mm ≤ 180 mm
f7	-20 μm -41 μm	-25 μm -50 μm	-30 μm -60 μm	-36 μm -71 μm	-43 μm -83 μm

Chemical Compositions

C	Mn	Si	P	S
max. 0.22	max. 1.60	max. 0.55	max. 0.025	max. 0.025

Mechanical Properties

Rm – Tensile strength (N/mm2)	Rp0.2 – Yield point (N/mm2)	A5 – Elongation (min. %)
min. 580	min. 435	10

Corrosion Resistance Properties

Standard Rods	Upon Request
For Ø < 20 mm: Rating 9 after 120 h in NSS	Rating 9 after 500 h in NSS
For Ø ≥ 20 mm: Rating 9 after 200 h in NSS

The corrosion resistance salt spray test is according to ISO 10289.

List of dimensions of cold-drawn chrome plated tubular shaft for E355+SR (EN 10305-1) / St52-3 BK+S (DIN 2391) Telescopic hydraulic cylinders.

Inner Diameter mm	Outer Diameter mm	Wall Thickness mm	Weight Kg/m
* 20	30	5	3.08
20	35	7.5	5.08
30	40	5	4.31
30	50	10	9.86
35	55	10	11.09
40	60	10	12.32
50	70	10	14.79
55	75	10	16.00
* 60	80	10	17.25
* 70	90	10	19.72
* 90	110	10	24.65
* 100	120	10	27.11
* 105	125	10	28.35

* Please contact us for the stock statuses of the dimensions marked with *.
You can contact us for your requests for chrome plated shaft with special diameters not given in the list.