As2556-2000 Electric resistance welded steel air heater tubes
1 SCOPE This Standard specifies requirements for electric
resistance welded steel
tubes in the as-welded condition intended for use in air heaters.
NOTE: Purchasing guidances are given in Appendix A.
2 APPLICATION This Standard is intended as a design guide for use
manufacturers of air heating exchangers.
3 REFERENCED DOCUMENTS The following Standards are referred to in
AS or AS/NZS
1050 Methods for the analysis of iron and steel (series)
4 DEFINITIONS For the purpose of this Standard, the following
4.1 Outside diameter and thickness—the nominal outside diameter and
4.2 Shall—indicates that a statement is mandatory.
4.3 Should—indicates a recommendation.
4.4 Tube, electric resistance welded—tube having a longitudinal
butt joint wherein
coalescence is produced by the heat obtained from resistance of the
tube to the flow of
electric current in a circuit of which the tube is a part, and by
the application of pressure.
10.1 Outside diameter The tolerance for the outside diameter shall
be +0, −1 percent.
10.2 Thickness The tolerance for the thickness shall be +10, −5
10.3 Weld bead trim The external weld upset shall be removed
completely, i.e. flush
with the outside surface of the tube.
The internal weld upset should not be removed, unless specified by
the purchaser. The
acceptance criteria for the internal weld upset trimming or removal
should be agreed
between the purchaser and manufacturer.
The following criteria are recommended:
For tubes ≤50.8 mm outer diameter or thickness ≤3.44 mm, maximum
flash height is
<0.15 mm; and for tubes >50.8 mm outer diameter or thickness
>3.44 mm, maximum
flash height is <0.25 mm.
Elements Analysis, percent (max.)
1. Can you provide a sample to check the quality?
We can provide free sample with same or similar sizes for you to
check tube quality.
You need to in charge of Express costs.
2. How about your production capacity?
3. What are your terms of payment?
30%TT in advance, Balance to be paid before shipment.
4. Where is your factory?
Jiaxing city, 2 hours away from Shanghai.
5. How can I get the quotation A.S.A.P?
Please send us an inquiry with full details as following,quotation
will sent to you A.S.A.P:
1). Tube Standard
2). Steel Grade
3). Tube Size and Size Tolerance
4). Tube length
6). If any special requirements
6. How about the minimum order quantity?
Normally for one size above 1 ton.
Welcome to contact us! Thanks.