Phosphor bronze with 8% tin. Excellent wear resistance, spring properties and seawater corrosion resistance. For bearings, springs and connectors.
Standardi
| Standardno tijelo |
Oznaka |
Zemlja |
| EN |
CuSn8 / CW453K |
EU |
| ISO |
CuSn8 (ISO 1187) |
Međunarodni |
| UNS |
C52100 |
SAD |
| ASTM |
B103 / B139 |
SAD |
| BS EN |
PB104 / CW453K |
UK |
| JIS |
C5210 |
Japan |
| GOST |
BrO8 (BrO8) |
Russia |
| JUS |
C.Sn8 |
Yugoslavia |
| GB |
QSn8-0.3 |
Kina |
Sastav (wt.%)
| Element |
Simbol |
Min % |
Max % |
Tipično % |
| Copper |
Cu |
91.000 |
92.500 |
91.800 |
| Tin |
Sn |
7.500 |
8.500 |
8.000 |
| Phosphorus |
P |
0.020 |
0.400 |
0.150 |
Fiz. svojstva
Raspon topljenja
780 – 830
°C
Topl. provodljivost
63
W/mK
Topl. rastezanje
18
×10⁻⁶/K
Obradivost
| Indeks obradivosti |
25.0% (B1112=100%) |
| Tokarenje HSS |
85.0 m/min |
| Tokarenje karbid |
380.0 m/min |
| Hrapavost |
Ra 0.4-1.6 um |
| Rashladni fluid |
Light oil or soluble oil 5-8% |
Meh. svojstva
| Stanje |
Rm (MPa) | Re (MPa) | A (%) |
HB | HRC | KV (J) | E (GPa) |
| Annealed (O) (+O) |
380 – 490 |
≥150 |
40 – 55 |
85 – 110 |
— |
— |
110 |
| Half Hard (H02) (H02) |
540 – 660 |
≥430 |
12 – 20 |
145 – 175 |
— |
— |
110 |
| Spring Hard (H06) (H06) |
700 – 820 |
≥650 |
2 – 5 |
200 – 230 |
— |
— |
110 |
Topl. obrada
| Vrsta |
Temperatura |
Medium |
Trajanje |
Tvrdoća |
| Stress Relief (mandatory after cold work) |
100 – 200°C |
Air oven |
1-2 h |
Minimal change |
| Anneal |
450 – 650°C |
Inert or H2/N2 atmosphere |
30-60 min |
HB 85-110 |
Primjena
Springs: Precision springs, wave springs, Belleville washers and high-fatigue spring contacts.
Connectors: High-load electrical connector contacts and high-cycle relay springs.
Bearings: High-duty bearing bushings and thrust washers for moderate-speed, high-load service.
Napomene
CuSn8 vs CuSn6: CuSn8: higher strength (700 vs 600 MPa spring hard), lower conductivity (9 vs 13% IACS). Use CuSn8 for mechanical springs requiring maximum stress; CuSn6 for electrical contacts where conductivity matters.
Seawater Resistance: Excellent seawater and salt-spray corrosion resistance. No dezincification risk.