En standard BK BKS NBK GBK Seamless CK45 cold drawn steel tube
1.Grade:20#,45#,Q345D,Q345B St52 St35 St45 1045 1020 STKM13C-T(25Mn)
2.OD:30mm-250mm Hydraulic cylinder Cold Drawn Steel Tube
3.Technique cold drawn
4.Suitable for hydraulic cylinder tubes,honing or skiving and roller burnishing cylinder tubes
5.What we can provide are cold drawn steel tube, cold drawn steel pipe, cold drawn tube, cold rolled tube, cold rolled steel pipe, honed tube, honed steel pipe, hydraulic cylinder tube, seamless steel tube, and so on.
Dimensions tolerance of cold drawn tube
Grade | OD(mm) | ID (mm) | Tolerance | ||||
OD (mm) | ID (mm) | Wall thickness deviation (mm) | Ovality (mm) | Curvature(mm/m) | |||
45# | 40-74 | 30-65 | ±.01 | -0.3,-0.5 | ≤0.5 | ≤0.1 | 0.3 |
74-98 | 65-85 | ±.01 | -0.4,-0.6 | ≤0.5 | ≤0.15 | 0.3 | |
100-116 | 85-100 | ±.02 | -0.4,-0.6 | ≤0.6 | ≤0.15 | 0.3 | |
124-134 | 110-115 | ±.02 | -0.6,-0.8 | ≤0.6 | ≤0.20 | 0.3 | |
140-158 | 120-135 | ±.02 | -0.7,-0.9 | ≤0.8 | ≤0.20 | 0.3 | |
165-176 | 140-150 | ±.02 | -0.7,-0.9 | ≤0.8 | ≤0.20 | 0.3 | |
188-203 | 160-180 | ±.02 | -0.7,-0.9 Honed | ≤0.8 | ≤0.20 | 0.3 | |
Mechanical properties of cold drawn tube
- Tensile strength:≥600Mpa
- Yield strength :≥520Mpa
- Elongation :>15%
- Hardness :HRB>85
- Supply condition:BKS(+SR)
Ready to hone tube (or ready to skiving tube)
| Grade | ST 52 |
| Inside diameter | 40 to 250mm |
| Max length | 14m. |
| Straightness | 0.5 /1000 |
| Type | cold drawing |
| ***Tubes are provided according to the norm EN10305-1 | |
CHEMICAL COMPOSITION (%)
Si(Max) | Mn(Max) | C(Max) | P (Max.) | S(Max) |
0.50 | 1.6 | 0.22 | 0.025 | 0.025 |
MECHANICAL PROPERTIES
Tensile strength Min | Yield Point Min | Elongation % Min |
580N/mm2 | 420N/mm2 | 10 |
EXCENTRICITY
Outer Diameter | Excentricity |
< =125 mm | 5 % |
> 125 mm | 7 % |
measured according to the formula:
E = (max Wt – min Wt)/( max Wt + min Wt) x 100 %
BORE OVALITY
The bore ovality is comprised in the 50 % of the inside diameter tolerances.
Marking:ID, OD
Length: unfixed length or fixed length
Package: banding with steel strips, braiding parcel at outside
Conservation: Anti rust oiled coating on the inside and outside of the surface, plastic caps at both ends
Main Production Progress:
| Raw material | → | Cold drawn | → | Heat treatment BK+S | → | Honed & SRB | → | Packing |
Finished products of cold drawn steel tube, cold rolled steel tube
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