SAE4140 ST52 BKS SEAMLESS HYDRAULIC CYLINDER HONED TUBE
STANDARD:DIN2391 ASTM A29/A29M-04
GRADE:SAE4140 ST52 C20 S45C
HEAT TREATMENT:BKS
OD:40-610MM
ID:20-300MM
ID TOLERANCE:H7-H9
LENGTH:0.5-9MTR
STRAIGHTNESS:1/1000
ID ROUGHNESS:Ra 0.4micron(max)
TECHNOLOGY:HONED&SRB(SKIVED AND ROLLER BURNISHED)
Processiong form | I.D | length | straightness | I.D tolerance | I.D rounghness |
Cold rolled | 20-100 | ≤10M | 0.3-1.0 | H7-H9 | 0.4-1.6 |
Cold drawn | 76-245 | ≤12M | 0.3-1.0 | H7-H9 | 0.8-1.6 |
honed | 40-180 | ≤7M | 1000 | H7-H9 | 0.4-0.8 |
SRB | 63-180 | ≤7M | 1000 | H7-H8 | 0.1-0.4 |
A. SAE4140 SEAMLESS HONED TUBE INSIDE IS VERY SMOOTH WIHTOUT THREAD
B.SAE4140 SEAMLESS HONED TUBE INSIDE WITH THREAD
CHEMICAL COMPOSITION (%)
| C | SI | MN | P | S | CR | NI | MO | CU |
| 0.38~0.45 | 0.17~0.37 | 0.50-0.80 | 0.035 | 0.035 | 0.90-1.20 | 0.30 | 0.15-0.25 | 0.35 |
MECHANICAL PROPERTIES(MPA)
| σb (MPa) | σs (MPa) | δ5 (%) | ψ (%) | Akv (J) | αkv (J/cm2) |
| ≥1080(110) | ≥930(95) | ≥12 | ≥45 | ≥63 | ≥78(8) |
HARDNESS:≤217HB
C.SAE4140 SEAMLESS HONED TUBE SURFACE IS VERY SMOOTH
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