Home/ Copper Alloys / CuZn37 (Brass)

CuZn37 (Brass)

Standard 63/37 brass — excellent cold-workability, good corrosion resistance. For cartridge cases, deep-drawn parts and decorative components.

Copper Alloys Brass ENCuZn37 / CW508L DIN W.NrCW508L UNSC27000 ASTMB36 Alloy C27000 +4
Download PDF Copper Alloys
Description

CuZn37 (EN CW508L) per EN 1652. 63% Cu, 37% Zn. Optimal Zn content for maximum cold-working ductility without risk of dezincification. Known as cartridge brass in North America. Outstanding deep-drawing and spinning characteristics. Standard for cartridge cases, bullet jackets, radiator cores, musical instruments and decorative fittings.

Key Properties — Annealed (O)
Rm (Tensile Strength)
320 – 440
MPa
Re / Rp0.2 (Yield)
120
MPa
A₅ (Elongation)
≥ 35.0
%
Hardness
65 – 95
HB
E (Young's Modulus)
105
GPa
Density
8.47
g/cm³
Main Designations (8)
Standard BodyDesignationCountry / RegionNote
EN CuZn37 / CW508L EU
DIN W.Nr CW508L Germany
UNS C27000 USA
ASTM B36 Alloy C27000 USA
BS EN CZ108 / CW508L UK
JIS C2700 Japan
GOST L63 Russia
JUS C.MZ37 Yugoslavia/BiH Standardna mesing legura 63/37; JUS B.C5.505
Standards (8)
#Standard BodyDesignationCountry / RegionNote
1 EN CuZn37 / CW508L EU —
2 DIN W.Nr CW508L Germany —
3 UNS C27000 USA —
4 ASTM B36 Alloy C27000 USA —
5 BS EN CZ108 / CW508L UK —
6 JIS C2700 Japan —
7 GOST L63 Russia —
8 JUS C.MZ37 Yugoslavia/BiH Standardna mesing legura 63/37; JUS B.C5.505
All values in wt.%
Cu
Copper
62.0000 – 65.0000
Zn
Zinc
35.0000 – 38.0000
ElementSymbolMin %Max %Typical %
Copper Cu 62.0000 65.0000 63.0000
Zinc Zn 35.0000 38.0000 37.0000
Mechanical Properties
ConditionCode Rm min
MPa		Rm max
MPa		 Re min
MPa		Re max
MPa		 A₅ min
%		 Z
%		 KV
J		 HB minHB max HRC minHRC max E
GPa
Annealed (O) +O 320 440 120 — 35.0 — — 65 95 — — 105.0
Half Hard (H02) H02 400 540 300 — 20.0 — — 100 125 — — 105.0
Hard (H04) H04 480 620 400 — 8.0 — — 125 155 — — 105.0
Physical Properties
Density
8.470
g/cm³
Melting Point
900–920
°C
Young's Modulus
105.0
GPa
Poisson's Ratio
0.350
—
Thermal Conductivity
123.0
W/m·K
Thermal Expansion
20.30
×10⁻⁶ /K
Specific Heat
377
J/kg·K
Electrical Resistivity
0.0640
µΩ·m
Magnetic
No
 
Heat Treatment
Annealing
Temperature:425°C – 650°C
Medium:Inert or reducing atmosphere
Duration:20-60 min
Cooling:Air or water cool
Hardness After:HB 65-95
Standard bright anneal.
Stress Relief (season cracking prevention)
Temperature:150°C – 200°C
Medium:Air oven
Duration:1 h
Cooling:Air cool
Hardness After:Minimal
Recommended after heavy cold work.
Machinability
Machinability Rating
relative to AISI B1112 = 100%
60.0%
Moderate
Turning Speed (HSS)
210
m/min
Turning Speed (Carbide)
920
m/min
Feed Rate (Turning)
0.400
mm/rev
Drilling Speed (HSS)
175
m/min
Milling Speed (Carbide)
930
m/min
CoolantSoluble oil 5-8%
Chip FormationMedium-long ductile chips
Tool MaterialHSS M2; carbide K20
Surface FinishRa 0.4-1.6 um
Good general machinability.
Applications
Hardware
Door and window hardware, hinges and locks.
Plumbing
Compression fittings, valve bodies and plumbing hardware.
Screw Machine Parts
General-purpose turned brass components on automatic lathes.
Radiators
Automotive and industrial radiator tanks and header plates.
Technical Notes
✅
CuZn37 vs CuZn30 vs CuZn39Pb3
CuZn30: max ductility for deep drawing. CuZn37: balanced strength and hot forgeability, the general default brass. CuZn39Pb3: Pb addition for free-machining screw stock. Use CuZn37 as default for general brass fabrication.