Single wall steel tubes
Dimension and specification
| O.D（mm） | Thickness（mm） | Weight（g/m） | Assurance Pressure（kg/cm²） |
4.00 | 0.50 | 43.21 | 250 |
4.20 | 0.5/0.7 | 45.68/60.50 | 250 |
4.76 | 0.70 | 70.18 | 250 |
6.00 | 0.70 | 91.61 | 250 |
6.35 | 0.70 | 97.66 | 250 |
8.00 | 0.7/1.0 | 126.18/172.85 | 200 |
9.53 | 0.7/1.0 | 152.63/210.63 | 200 |
10.00 | 0.7/1.0 | 160.75/222.24 | 200 |
Technical requirement
| Chemical Composition | C - Max 0.12% |
Mn - Max 0.50% | |
P - Max 0.04% | |
S - Max 0.045% | |
Mechanical Properties | Tensile strength - Min 30kgf/mm² |
Yield point - Min 18kgf/mm² | |
Elongation(50mm) - Min 25% | |
Hardness(HR30T) - Max 65 | |
Thickness | ±0.08mm |
Bead height | outside＜1.0mm，inside ≤0.2mm |
outside≥1.0mm，inside ≤0.3mm | |
Expand test | 4.20-10.00 Max20% |
Internal cleanliness | particle and oil＜0.194g/㎡ |
Leak test | press assurane pressure, No leak after 5 min |
Surface coating treatment type
1)No any coating
2)copper coating
3)copper/no copper+ Cr3+ znic/Nano
4) copper/no copper+ Cr3+ znic+ PVF/galfan(Al-Znic)
Cross section
Technical Specification of External Surface Treatment
| Treatment Layer | Thickness（μm） | Salt Spray Test（Hours） | |
White Rust | Red Rust | ||
Zinc | 8,13,25 | ＞70 | ＞192/240/280 |
Chromate | ＜3 | ＞72 | ＞192/240/280 |
PVF（ Poly vinyl fluoride） | ＞8,15,25 | ＞240 | ＞3000 |
Sorts of Surface Treatment&color
Electrolyte Zinc Plating + Chromate Yellow
Electrolyte Zinc Plating + Chromate Olive
Electrolyte Zinc Plating + Chromate Olive + PVF Olive Green
advantages after surface treatment
High density zinc plating will increase durability of tube surface and chromate passivation will delay the white corrosion appear.Trivalent chromate (cr+3)passivation is also available for environmental requirement. PVF coating quality shall give a high resistance against corrosive conditions. Nickel and Zinc plating and double coating PVF or PVDF are developing to meet for customers’high quality requirement.
Product Usage
1）Fluid Carrying System for Automobiles
Hydraulic Brake Lines of Passenger Cars
Air Brake Lines of Commercial Vehicles
Hydraulic Lines for Power Steering System
Oil Cooler Lines
Heating Circuit Lines
2）luid Carrying System for Refrigerators
Condenser Coil
Wire Condenser
Freezer Evaporator Coil
Door Edge Heater Coil
Defrost Water Evaporator Coil
Freezing Shelves Coil
Compressor Suction and Discharge Tube
Compressor Oil Cooler Line
international test standard
SAE J526b/JASO M101-94/KS R2028
