With smooth surface, the average roughness Ra is 0.6µm≤Ra≤1.9µm
Inner cleanliness is 0.1948/m² Max.
Various ways of bending and cutting fabrication is possible
Zinc, copper plating is available following customer’s request. The hot galvanizing thickness can be above 8 µm
Clean inner wall with industrial alcohol to guaranty the cleanliness
Salt spray test for hot galvanizing tube is above 72 hours
Packing: antirust paper for inner packing and cloth for outer packing

2. Steel Grade

BHG1, SPCC, SPCD, SPCEN, ST14, ST15, ST16, DC04, DC05, DC06

3. Heat Treatment

BK or NBK

4. Specification

OD mm	4	4.2	4.76	6	6.35	7.8	8	9.52
W T	0.5-1.0mm (0.5-0.7mm common WT)
Tolerance	±0.05mm
Length	180Kg/coil; 700-1000m/coil; per customer’s request

5. Production Process

Tube welding– Cold drawing (reduce diameter)– Annealing in Protected Atmosphere— Cleaning-- Leakage detection– Zinc/Copper Plating– Keep pressure (Airtightness) – Packing

6. Surface Treatment

Coating	Thickness	Salt spray test duration
Copper/White Zinc/Colour-Zinc	8μm	72h
PVF	8μm+20μm	1000-2000h
Military Green Zinc	8μm	180h
GALFAN	8μm+20μm	1000-2000h
Nylon	8μm+40μm	180h

7. Packing: In coil, in wooden box with seaworthy packing

8. Application

Fluid carrying system for automobiles

Fluid carrying system for refrigerators

Wire condenser for chillers, showcase

Vending machine, ice machine etc.

Product Tags:

r134a refrigerant 30 lb cylinder

carbon steel heat exchanger tubes

carbon steel boiler tube

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