STEEL TUBES FOR REFRIGERATION

Features
Electrowelded steel tubes, unplated or zinc coated.
They are mainly used to manufacture condensers, evaporators and heating tubes.

Gauges
outside diameter (mm): min 4.00 - max 9.52
tolerance (mm): 0.08
wall thickness (mm): min 0.64 - max 0.71
tolerance (mm): min 0.08 - max 0.13

Supply conditions
- Additional requirements or ones diverging from
the present specifications must be analyzed
and agreed beforehand
- Tubes can be supplied in coils or bars

Techincal characteristics:

Grade
- Welded low carbon steel tube 1006/1010 (SAE J526), NBR 5906

Surface appearance
- Resistance in salt spray: according to ASTM B117
(zinc coated tube) ≥ 48 hours
- The unplated tube is supplied with oiled outer surface
- Hot dip galvanized

Physical-chemical properties
- Insoluble internal residue max 12 mg/sqm
- Soluble internal residue max 28 mg/sqm ASTM A254/84
and NBR 14666
- Total internal residue max 40 mg/sqm
- Internal moisture max 50 mg/l NBR 14667
- Compatibility with R134a gas max -36 °C NBR 14669
- Chemical reactivity NBR 14668

Mechanical characteristics
- Tensile strength ≥ 290 MPa
- Yield strength ≥ 170 MPa
- Elongation ≥ 14%
- Hardness max 80 HR 15 T
- Hydrostatic resistence ≥ 725 psi
- Expansion max 25%