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Hydraulic cylinders production technologies
Chromed bars
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Steel Grade: Ck 45., St 52.3, 20 Mn V6, Ck 55, 42 Cr Mo 4
>>>chromed tubes |
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Steel grade |
Ñ |
Mn |
Si
max |
P
max |
S
max |
V |
Cr |
Mo |
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Ck 45 |
0,42-0,50 |
0,50-0,80 |
0,40 |
0,035 |
0,030 |
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St 52.3 |
<0,20 |
<1,55 |
0,55 |
0,040 |
0,040 |
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20 Mn V6 |
<0,18 |
<0,30 |
1,50 |
0,030 |
0,030 |
0,10 |
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Ck 55 |
0,50-0,60 |
0,60-0,90 |
0,40 |
0,035 |
0,035 |
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42 Cr Mo 4 |
0,38-0,45 |
0,50-0,80 |
0,40 |
0,035 |
0,035 |
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0,90-1,20 |
0,15-0,39 |
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Steel grade |
Tensile strength
N/mm2
min max |
Yield point
N/mm2 |
Elongation
% |
Delivery condition |
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Ck 45 |
600-750 |
340 |
17 |
Without heat treatment |
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St 52.3 |
490-630 |
353 |
20 |
Without heat treatment |
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20 Mn V6 |
600-700 |
450 |
19 |
Without heat treatment |
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Ck 55 |
800-850 |
500 |
14 |
Induction hardened |
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42 Cr Mo 4 |
950-1000 |
800 |
12 |
Austempered |
SURFACE PROTECTIONAll bars are protected with plastic or with other highly protective packaging.
TESTS:After chromium plating, each bar is tested fo:
- chromium deposit concentricity
- surface characteristics
- dimensional tolerances
- chromium layer thickness
LENGTHS:
RANDOM LENGTHS:
- up to O. D. 19 mm L = 4/5 m .
- over O. D. 20 mm L = 5.8 /7 m = 5,8/7 m
FIXED LENGTHS: standard fixed length tolerance is -0 +5 mm.
Tighter tolerances can be agreed on request.
CERTIFICATES:
All bars have certificates showing chemical analysis and mechanical properties
according to DIN and certificates of corrosion resistance in a salt spray according to ASTM B 117.
CHROMIUM LAYER CHARACTERISTICS
WALL THICKNESS:
- from O. D. 8 to O. D. 19 mm ≥ 15 µm
- from O. D. 20 to O. D. 125 mm ≥ 20 µm
- from O. D. 127 to O. D. 500 mm ≥ 40 µm
- HARDNESS: 850 - 1150 HV
- TOLERANCES: according to ISO f7
- STRAIGHTNESS: 0,3 mm/1000 mm.
- OVALITY: 1/2 of the O. D. tolerance
- SURFACE ROUGHNESS: Ra max 0,2 µm.
Chromed bars with double chromium plating are available on request. |
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