ASTM B138 / B138M

This specification establishes the requirements for manganese bronze rod, bar and shapes produced in Copper Alloy UNS Nos. C67000, C67500, or C67600.The values stated in inch-pound units or SI units are to be regarded separately in the standard. Within the text, the SI values are given in brackets. The values stated in each system of units are not exact equivalents; each system is independent of the other. Combining values from the two systems may result in nonconformance with the specification.

Chemical Properties

Copper Alloy UNS No.	CopperA	Tin	Lead	Zinc	Iron	Aluminum	Manganese
C67000	63.0–68.0	0.50 max	0.20 max	remainder	2.0–4.0	3.0–6.0	2.5–5.0
C67500	57.0–60.0	0.50–1.5	0.20 max	remainder	0.8–2.0	0.25 max	0.05–0.50
C67600	57.0–60.0	0.50–1.5	0.50–1.0	remainder	0.40–1.3	. . .	0.05–0.50

Note:
A Includes silver.

Mechanical Properties

Form	Temper Designation, Code	Material Conditions	Diameter or Distance Between ParallelA Surfaces, in.	Tensile Strength, min, ksi	Yield Strength at 0.5 % Extension Under Load, min, ksi	Elongation min, %B
Copper Alloy UNS No. C67000
Rod and bar	060	soft-anneal	all sizes	85	45	10
	H02	half-hard	all sizes	105	60	7
	H04	hard	all sizes	115	68	5
	M10	as hot forged
			all sizes	C	C	C
	M20	as hot rolled
	M30	as hot extruded
Copper Alloy UNS Nos. C67500 and C67600
Rod	O60	soft anneal	all sizes	55	22	20
	H02	half-hard	1 and under	72	36	13
			over 1 to 21⁄2 incl	70	35	15
			over 21⁄2	65	32	17
	H04	hard	1 and under	80	56	8
			over 1 to 11⁄2 incl	76	52	10
			over 11⁄2 to 21⁄2 incl	73	48	12
			over 21⁄2	68	45	16
Bar	O60	soft anneal	all sizes	55	22	20
	H02	half-hard	1 and under	72	36	13
			over 1 to 21⁄2 incl	70	35	15
			over 21⁄2	65	32	17
	H04	hard	1 and under	76	52	8
			over 1 to 21⁄2 incl	72	47	12
			over 21⁄2	68	45	16
ShapesD	O60	soft anneal	all sizes	55	22	20

Note :
A For rectangular bar, the Distance Between Parallel Surfaces refers to thickness.
B Elongation in 4 x diameter or thickness of specimen. In any case, a minimum gage length of 1 in. shall be used.
C See Note 3. The tensile properties of as-hot-forged (M10), as-hot-rolled (M20), and as-hot-extruded (M30) are essentially the same as those shown for rod and bar, but have not been finalized for publication.
D Tensile requirements for drawn shapes shall be as agreed upon between the manufacturer and the purchaser at the time of the order.

Mechanical Properties, [SI]

Form	Temper Designation, Code	Material Conditions	Diameter or Distance Between ParallelA Surfaces, in.	Tensile Strength, min, ksi	Yield Strength at 0.5 % Extension Under Load, min, ksi	Elongation min, %B
Copper Alloy UNS No. C67000
Rod and bar	060	soft-anneal	all sizes	585	310	10
	H02	half-hard	all sizes	720	415	7
	H04	hard	all sizes	790	415	7
	M10	as hot forged
			all sizes	C	C	C
	M20	as hot rolled	-	-	-	-
	M30	as hot extruded	-	-	-	-
Copper Alloy UNS Nos. C67500 and C67600
Rod	O60	soft anneal	all sizes	380	150	20
	H02	half-hard	1 and under	500	250	13
			over 1 to 21⁄2 incl	450	240	15
			over 21⁄2	450	220	17
	H04	hard	1 and under	550	385	8
			over 1 to 11⁄2 incl	525	360	10
			over 11⁄2 to 21⁄2 incl	510	330	12
			over 21⁄2	470	310	16
Bar	O60	soft anneal	all sizes	380	150	20
	H02	half-hard	1 and under	500	250	13
			over 1 to 21⁄2 incl	450	240	15
			over 21⁄2	450	220	17
	H04	hard	1 and under	525	360	8
			over 1 to 21⁄2 incl	500	325	12
			over 21⁄2	470	310	16
ShapesD	O60	soft anneal	all sizes	380	150	20

Note:
A For rectangular bar, the Distance Between Parallel Surfaces refers to thickness.
B Elongation in 4 x diameter or thickness of specimen. In any case, a minimum gage length of 25 mm shall be used.
C See Note 3. The tensile properties of as-hot-forged (M10), as-hot-rolled (M20), and as-hot-extruded (M30) are essentially the same as those shown for rod and bar, but have not been finalized for publication.
D Tensile requirements for drawn shapes shall be as agreed upon between the manufacturer and the purchaser at the time of the order.