Aluminium brass tubes C68700

Inhibited Aluminum Brass tubes – C68700 – resists the action of high-velocity salt and blackish water and is commonly used for condenser tubes. The main characteristic of C68700 is its high resistance to impingement attack. Tubes of this alloys are recommended for use in Marine and Land Power Stations, in which cooling water velocities are high.

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Aluminium brass tubes are highly accepted and one of the extensively used material for various industrial applications. This alloy develops a protective film that has self-healing properties. This film is dependent on oxygen, which is dissolved in the water and does not renew itself in polluted or stagnant water. High resistance to corrosion in clean seawater or inland conditions is difficult.

Aluminum Brass tubes resist the action of high-velocity salt and brackish water. The outstanding characteristic of this alloy is its superior resistance to impingement attack.

High strength combined with good general corrosion resistance and low susceptibility to stress corrosion cracking of aluminum brass tubes make it a highly preferred material for load bearing masonry fixings.

In case, the brass tubes are used in hard drawn conditions, or if they have been severely cold worked through bending or swaging in assembly, they should generally be heat treated to ensure freedom from stress corrosion cracking.

Inhibited Aluminum Brass tubes – C68700 – resists the action of high-velocity salt and blackish water and is commonly used for condenser tubes. The main characteristic of C68700 is its high resistance to impingement attack. Tubes of this alloys are recommended for use in Marine and Land Power Stations, in which cooling water velocities are high.

Technical Specifications :

Specification :
Aluminum Brass Tubes
  • ASTM B 111 C 68700
  • ASME SB 111
  • C 68700
  • BS 2871 PART 3 CZ – 110
  • EN 12451 CuZN20 AL2As
  • NFA 51 102
  • CuZn22 Al2
  • JIS H – 3300 C 6870

 

Standard BS 2871 PART3 ASTM B 111 DIN 1785 NFA 51 102 JIS H3300 IS 1545
Symbol CZ 110 C 68700 CuZn20AI2 CuZn22AI2 C 6870 CuZn21AI2As
Cu 76.0-78.0 76.0-79.0 76.0-79.0 76.0-79.0 76.0-79.0 76.0-78.0
Al 1.8-2.3 1.8-2.5 1.8-2.3 1.8-2.5 1.8-2.5 1.8-2.3
Pb 0.07 0.07 0.07 0.07 0.07 0.07
Ni 0.1
Fe 0.06 0.06 0.07 0.06 0.06 0.06
Zn REM’DER REM’DER REM’DER REM’DER REM’DER REM’DER
As 0.02-0.06 0.02-0.06 0.02-0.35 0.02-0.06 0.02-0.06 0.02-0.06
P 0.01
Total Impurities Max.
0.03 0.1 0.3 0.3
Condition M 61 F39 O O
TA F34 TA
O D
Yield Strength n/mm2 125 1 50-230 400Mpa Max.
105 120-180 355Mpa Min.
415Map
Tensile n/mm2 Minimum 345 390 373
340
Elng’Tion Percent (%) 45Min. 40Min. 85Max.
55Min. 80-110
130Min.
Hardness HV5 – 150Min 80-130
85-110
75Max.
Grain Size mm (75X) 0.05Max. 0.010-0.045 0.010-0.045 0.010-0.045 0.010-0.045

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