USE:
THIS SPECIFICATION INCLUDES ALL THE RELEVANT INFORMATIONS NECESSARY FOR THE DESIGN AND MANUFACTORING OF MULTI-STAGE TELESCOPIC CYLINDERS.

MATERIAL:

SEAMLESS OR WELDED, COLD DRAWN OR HOT ROLLED STEEL TUBES.

STEEL GRADES:

E 355 (STANDARD)
E 410 mod. (UPON REQUEST)

MATERIAL CONDITIONS:

         - COLD DRAWN:
              - STRESS RELIVED (SR)
              - NORMALIZED (N)
         - HOT ROLLED:
              - AS ROLLED (AR)
              - NORMALIZED (N)

MACHINING:

Before machining all the tubes are straightened; then outside turned down 1 to 3 millimeters
in order to remove all the steel surface defects giving better roundness and uniform stock allowance on the whole length. At this stage, the tube could be sold as material suitable for grinding and chrome plating process.
By the outer honing process with roughness 0,4 my Ra max and grade 8 tolerance field, the tube is ready to be used with or without chrome plating, having a better roundness than the grinded one,<br /> for the tube piston rods application. A.L.T.A. Spa can supply o.d. chrome plated tube piston rod as well, accordingly to the customer needs, with the following general properties:


CHROME LAYER:
25 my +/- 5 my
CHROME HARDNESS:
850-1150 (vickers)
SURFACE ROUGHNESS:
0,2 my Ra; 2 my Rt (UNI ISO 468/91)
AHDESION:
No detaching or microcracks after thermic shock (test a 300° c. 1 hour
and fast cooling in 20° c water.)
CORROSION RESISTANCE:
test according to ISO 1456/1450, rating 8 - 10
CORROSION RESISTANCE: 
Test in neutral salt spray according to ASTM B 117
resistance warranty 40 ore rating 9 according to ISO 4540/3769

TELESCOPICS:
A.M. TUBES CAN BE SUPPLIED ALSO INSIDE HONED FOR THE TELESCOPIC CYLINDERS MULTISTAGE. (MOBILE CRANES - TIPPING GEARS A.S.O.)

DIMENSIONAL RANGE:

MIN. INNER DIAMETER: 20 mm.
MAX. OUTER DIAMETER: 250 mm.
LENGHTS: 9300 mm. MAX.

PACKING:

WOODEN CASES (AT COST) ARE NECESSARY TO PROTECT THE EXTERNAL SURFACE OF THE TUBES DURING TRANSIT.
STANDARD PACKING: PAPER, MELTED PLASTIC, CARD BOARD TUBES, JUTE LAMIFLEX.

CERTIFICATION:

MATERIAL: EN 10204:2004/3.1
MACHININGS: TEST UPON REQUEST WILL BE MADE BY A.L.T.A. Spa ACCORDINGLY TO THE CUSTOMER NEEDS AND SPECIFICATIONS.

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