External chrome plated and inside honed telescopic tubes

NIMAX TL

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NIMAX TL series - external chrome plated inside honed (or skived and roller burnished) steel tubes for telescopic cylinders.

Dimensions:

  • External by request (according EN 10305-1; EN 10305-2)
  • Inside between 32-200 mm

Steel grades:

  1. St 52.3 BK+S (E 355+SR)
  2. St 52 BK (E 355+ C)

Tolerance:

  • Outside: ISO f8
  • Inside: ISO H8 /ISO H9

Roundness:

  • Outside: max 1/2 IT
  • Inside: max IT

Length: max. 6500 mm

The "unchromed length" of each tube (the distance at each end over which the chrome-layer properties and tolerances can not be guaranteed) is at most 0.15 m per end, maximum 0.3 m in total per tube. Fixed or cut lengths can be supplied on request.

Surfaces roughness:

  • Outside: max Ra=0,20 µm
  • Inside:
    • max Ra=0.60 µm (for honed tubes)
    • max Ra=0.30 µm (for skived and roller burnished tubes)

Hard chrome plated thickness: min. 20 µm

Chrome layer hardness: min. 950 HV 0,1

Straightness:

  • Local deviation: max. 1 mm per each meter of length
  • Total deviation:
    • for tubes with length less than 6 m - max. 3.5 mm;
    • for tubes with length bigger than 6 m, the tolerance shall be increased by 0.5 mm for each 1 m over 6 m.
CHEMICAL COMPOSITION, % BY WEIGHT
STEEL GRADE C max Si max Mn max P max S Ni max V max
St52 (E 355) 0.2 0.55 1.55 0.025 0.02-0.04 - -
MECHANICAL PROPERTIES (According to EN 10305-1)
STEEL GRADE
Delivery condition		 Rm Tensile
strenght		 Rp0.2
Yield point		 A5
Elongation
- N/mm2 - - N/mm2 - - % min -
  Wall thickness ≤ 16mm Wall thickness ≥ 16mm  
E 355 +SR 600 520 490 14
E 355 +N 490-630 355 355 22
MECHANICAL PROPERTIES (According to EN 10305-2; DIN 2393)
STEEL GRADE
Delivery condition		 Tensile strenght Rm Yield point Rp0.2 Elongation A5
- N/mm2 - - N/mm2 - - % min -
  Wall thickness ≤ 16mm Wall thickness ≥ 16mm  
E 355 +C  (St 52 BK) 640 540 500 7

According to ISO 9227:1990 for the AASS and NSS test and ISO 10289:1999 for the evaluation of the results.

External diameter (mm) Min Rating 9 (0.1% max of corroded surface)
32 to 200 120 h NSS 40 h AASS
ISO 9227 ASTM DIN 50021 Salt spray type
NSS B 117 SS Neutral
AASS B 287 ESS Acetic acid
CASS B 368 CASS Copper-accelerated acetic acid
EN
10305-1
10305-2		 DIN
2391
2393
17179		 AFNOR
NF-A49310
NF-A49643		 B.S.
6323		 UNI
7945
7946
663
6403		 JIS
G3445 		ASTM
A 513
E355 St52
St52-3		 Tu 52b
Ts 47a		 CEW5-ERW5 Fe 490
Fe 510 D
Fe 52-2
Fe 510		 STKM 19 1024
E410 StE 460 20MV6 - - - -

Packaging

Packaging

NIMAX TL tubes can be supplied as follow:

  • Each tube is individually packaging in cardboard tubes with caracteristic red and white spiral stripes
  • Each tube are inside protected with oil in order to assure the temporary protection against corrosion
  • Ends of tubes are protected with plastic plugs
  • Package on wooden europalets

Marking

For each tube the paper tube will be marked with black colour: "NIMAX TL / OD + Tolerance x ID diameter+Tolerance / Steel grade/ Heat no. / Date"

Where: OD = outside diameter; ID = inside diameter

On each palet they will be applied minimum one label for identification.