BRASS ROUND TUBES FOR HEAT EXCHANGERS

BRASS ROUND TUBES FOR HEAT EXCHANGERS


Standard documents:
BS EN 12451:1999 - Copper and copper alloys. Seamless round tubes for heat exchangers
ASTM B 111 M - Specification for seamless tubes for condensers and sleeves made of copper and copper alloys.


Alloy:

CuZn20Al2As, CuZn28Sn1As with chemical composition BS EN 12451:1999.

C44300, C68700 with chemical composition ASTM B111M.


Method of manufacturing: expanded

Purpose: The tubes used in heat exchangers

Outside diameter - 10 mm to 50 mm inclusive *

Wall thickness - 0.8 mm to 3.0 mm inclusive *

Length - 1000 - 12000 mm *


Requirements for hire:

1. The geometric dimensions according to BS EN 12451:1999, ASTM B111M.

2. The mechanical properties and condition of the material:

2.1.For tubes of ASTM B 111M, BS EN 12451:1999

Standard number

Alloy

State

Ultimate strength,
MPa, no less

Yield strength, MPa, no less

The relative elongation,%
at least

Average sizegrain. um

ASTM B111M

44300

61

310

105

-

0,010-0,045

68700

61

345

125

-

BS EN 12451:

1999

CuZn20Al2As

R340

340

120

55

0,010-0,050

R390

390

150

45

CuZn28Sn1As

R320

320

100

55

0,010-0,050

R370

360

140

45


The tubes should be sealed. Control discontinuities is performed using the eddy current flaw detector.

By BS EN 12451:1999 and ASTM B 111M average grain size is regulated for the tubes in the annealed condition.

Determination of the average grain size is carried out in accordance with the requirements of DIN EN ISO 2624:1995 and ASTM B 111M, ASTM E 112, respectively.

Other requirements according to ASTM B111M, BS EN 12451:1999.

_______________

* Requirements for the geometric dimensions of tubes negotiate with the customer when ordering.



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