Chemical composition
Nominal: mid-range where both limits are given, the cap where only a maximum is, balance takes the remainder. Exact specified ranges below.
| Element | Name | Content % | |
|---|---|---|---|
| Main elements4 elements | |||
| Cu | Copper | 76 – 79% | |
| Zn | Zinc | Bal. | |
| Al | Aluminium | 1.8 – 2.5% | |
| As | Arsenic | 0.02 – 0.06% | |
| Element | Name | Content % | |
|---|---|---|---|
| Minor & residual2 elements | |||
| Pb | Lead | ≤ 0.07% | |
| Fe | Iron | ≤ 0.06% | |
Mechanical minima by form
Guaranteed values differ by form, size and delivery condition; quotations confirm the specification, form, size and condition.
| Form | Condition | Rm MPa | Rp0.2 MPa | A ≥ % | Other requirements and notes |
|---|---|---|---|---|---|
| Straight seamless condenser and heat-exchanger tube | O61, annealed | ≥ 345 (50 ksi) | ≥ 125 (18 ksi) | — | |
| U-bend seamless heat-exchanger and condenser tube (OD ≤50 mm) | Annealed to O61 before bending; the U-bend must be stress-relief annealed after bending | ≥ 345 (50 ksi) | ≥ 125 (18 ksi) | — | |
| Seamless heat-exchanger tubes (EN 12451) | R340 (annealed) | ≥ 340 | ≥ 120 | ≥ 55 | Drift expansion ≥ 30 %; may also be ordered by hardness: H070, 70–100 HV. |
| Seamless heat-exchanger tubes (EN 12451) | R390 (annealed) | ≥ 390 | ≥ 150 | ≥ 45 | Drift expansion ≥ 30 %; may also be ordered by hardness: H085, 85–110 HV. |
Where this grade is recommended
Matched in 4 service conditions; ranks and scores computed from the condition-scoring matrix.
| Service condition | Industry | Temperature | Rank | Score |
|---|---|---|---|---|
| Firewater & deluge | Marine & Offshore | ≤ 40 °C | 2 / 7 | 88 |
| Seawater piping & HX | Marine & Offshore | ≤ 40 °C | 8 / 11 | 88 |
| Ballast & tank systems | Marine & Offshore | ≤ 40 °C | 9 / 10 | 84 |
| PV mounting & frames | Solar & Glass | Ambient outdoor | 3 / 3 | 76 |
Designations & equivalents
| UNS | C68700 |
| W.Nr. (Germany) | 2.0460 |
| EN material number (copper) | CW702R |
| EN designation | CuZn20Al2As |
| Trade name(s) | Aluminium Brass |
| ASTM / AISI | B111 / B395 |
| JIS (Japan) | C6870 |
| GOST (Russia) | ≈ ЛА77-2 |
Cross-references are common near-equivalents for search and shortlisting; substitution across standards requires clause-by-clause verification. All grades in one cross-reference table →
Applicable standards
6 specifications. Name the standard and its edition on the order.
Guaranteed values and required tests differ between specifications — see Mechanical minima by form for the figures per form.
Frequently asked questions
What is HAl77-2 Aluminium Brass (C68700)?
HAl77-2 Aluminium Brass (C68700) — Copper. Seawater condenser tubing, erosion resistant
What is the maximum service temperature of HAl77-2?
Typically about 200 °C; the practical limit depends on media, stress and design life — acceptance per the governing standard.
What is the tensile strength of HAl77-2?
The specified minimum tensile strength is 345 MPa for the main product form. Minima for other forms and sizes are listed under "Mechanical minima by form" on this page.
Which standards cover HAl77-2?
ASTM B111/B111M, ASTM B395/B395M, EN 12449 (seamless copper tubes), EN 12451 (seamless copper tubes for heat exchangers), EN 1652 (copper plate, sheet and strip), EN 1653 (copper plate for boilers and pressure vessels)
Where is HAl77-2 typically used?
Firewater & deluge (Marine & Offshore); Seawater piping & HX (Marine & Offshore); Ballast & tank systems (Marine & Offshore); PV mounting & frames (Solar & Glass)
In which forms is HAl77-2 available?
Tube, plate, strip, bar, forgings, wire and other forms — sizes and delivery condition confirmed per order, with EN 10204 3.1 / 3.2 certification.
Same series
Download PDF datasheet
This grade’s datasheet as an A4 PDF — for filing, printing or forwarding to colleagues.
Download PDF datasheetSupply & enquiry
Tube & pipeφ1 – 219 × 0.25 – 25 mm
Plate4.76 – 80 mm
Barφ8 – 300 mm
Wire & filler metalsφ0.01 – 8 mmFor this grade we can supply, against your service conditions:
- Tube, plate, strip, bar, forgings, wire and more — with size range and lead time
- Chemistry and mechanical test report (EN 10204 3.1 / 3.2)
- Like-for-like alternatives and selection advice
- Applicable standards and inspection scope
Or email us: info@kochlin.com