C1720 C1720 B C1720 W - JIS H 3270-2018

Grade	C1720
Other Names
Corresponding Standard	JIS H 3270-2018 Copper beryllium alloy, phosphor bronze and nickle silver rods, bars and wires
Classification	Copper and Copper Alloys

C1720 Chemical Element Composition Content (%)

Component	Be	Ni ^*	More
Minimum Value	1.8	0.2	Cu+Be+Ni+Co+Fe≥99.5；Ni+Co+Fe≤0.6
Maximum Value	2	-	Cu+Be+Ni+Co+Fe≥99.5；Ni+Co+Fe≤0.6

C1720 Mechanical Properties

condition	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Hardness HBW
Bar (B); 3≤d≤6	Annealing (O)	410~590	HV 90~190
Bar (B); 6<d≤35	Annealing (O)	410~590	90~190
Bar (B); 3≤d≤6	Hardening Treatment (H)	645~900	180~300
Bar (B); 6<d≤35	Hardening Treatment (H)	590~900	175~330
Bar (B); 3≤d≤6	Annealing (O) + aging	1100~1380	320~420
Bar (B); 6<d≤35	Annealing (O) + aging	1100~1380	320~420
Bar (B); 3≤d≤6	Hard (H) + aging	1270~1650	340~440
Bar (B); 6<d≤35	Hard (H) + aging	1210~1620	330~430
Wire (W); 0.40≤d≤1	Annealing (O)	390~540
Wire (W); 0.40≤d≤5	1/4 Hard (1/4H)	620~805
Wire (W); 0.40≤d≤5	3/4 Hard (3/4H)	835~1070
Wire (W); 0.40≤d≤1	Annealing (O) + aging	1100~1380
Wire (W); 0.40≤d≤5	1/4-Hard (1/4H) + Aging	1210~1450
Wire (W); 0.40≤d≤5	3/4 Hard (3/4H) + Ageing	1300~1590

d=diameter or width across flats; unit mm

1 Approximate Comparison Table Processing of high copper alloy

China		Japan	United States		International Organization for Standardization		Russia
GB	ISC	JIS	ASTM	UNS	ISO	Numerical Grade	GOST
TBe1.9 QBe1.9	T17710	C1720 C17200	97.5Cu-1.9Be-.3Co-.2Ti	C17200	CuBe1.9CoTi	C17200	БрБНТ1.9

2 Approximate Comparison Table Processing of high copper alloy

China		Japan	United States		International Organization for Standardization		Germany		European Standard		Russia
GB	ISC	JIS	ASTM	UNS	ISO	Numerical Grade	DIN EN/DIN	W-Nr.	EN	Numerical Grade	GOST
TBe2 QBe2	T17720	C1720 C17200	97.8Cu-1.9Be-.3Co	C17200	CuBe2	C17200	CuBe2	C17200 2.1247	CuBe2	CW101C	БрБН2

C1720 Corresponding Standards(Same grade name, different standards)

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