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,
|
Yield strength, MPa, no less
|
The relative elongation,%
|
Average size grain. um |
|
ASTM B111M |
Ñ44300 |
Î61 |
310 |
105 |
- |
0,010-0,045 |
|
Ñ68700 |
Î61 |
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.
Back to section
