Process: cold drawn

The tubes cover minimum wall thickness.

Application: tubular heat exchangers, superheaters, boilers.

Dimensional range:

OD: 12.7-76.2mm

Length: up to 24m

Any specific size is to be discussed before offer

The tube be 100% eddy current tested

Ultrasonic test is as option

Straightness ≤1mm/1000mm

Roughness: Ra ≤0.8

Heat treatment

All tubes of grades, except T23, T91 shall be reheated and furnished in the full-annealed, normalized and tempered condition.

Mechanical properties

Hardness

T9 shall have a hardness not exceeding 179HB or 89HRB

Grade T91, T92 shall have a hardness not exceeding 250HB or 25HRC

Grade T23 shall have a hardness not exceeding 220HB or 97HRB

Grade T5, T9, T11, T22 shall have a hardness not exceeding 163HB or 85HRB.

Test

One tension test shall be made on a specimen for lots of not more than 50 tubes. Tension tests shall be made on specimens from two tubes for lots of more than 50 tubes
One flattening test shall be made on specimens from each end of one finished tube, not the one used for the flaring test, from each lot.
One flaring test shall be made on specimens from each end of one finished tube, not the one used for the flattening test, from each lot.
Each tube shall be subjected to the hydrostatic test, or, instead of this test, a nondestructive electric test may be used when specified by the client.

Surface quality

Cold drawn steel tubes shall be free of scale and suitable for inspection. A slight amount of oxidation is not considered scale.
Any special finish requirement shall be subject to agreement between the supplier and the purchaser.

Tubes shall be delivered with square cut ends. The ends are free of excessive burrs.

The tubes are bundled in the waterproof plastic sheet and packed in the wooden cases

The case is most suitable for hanging by forklift.

EN10204-3.1 MTC shall be issued

EN10204-3.2 MTC is as option

Product Tags:

austenitic seamless tube

hot finished seamless steel tubes

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