Bronze Strip

Chemical Composition
Equivalents
Mechanical properties
Finishes
Tolerances

Designation			Chemical composition in % (mm)
Designation			Min. Cu	Max. Fe	Max. Ni	Min. P	Max. P	Max. Pb	Min. Sn	Max. Sn	Min. Zn	Max. Zn	Others total max.
Classification of symbols	Numerical classification	European Standard (EN)	Min. Cu	Max. Fe	Max. Ni	Min. P	Max. P	Max. Pb	Min. Sn	Max. Sn	Min. Zn	Max. Zn	Others total max.
CuSn4	CW450K	EN 1652/1654	Rest	0.1	0.2	0.01	0.4	0.02	3.5	4.5	-	0.2	0.2
CuSn6	CW452K	EN 1652/1654	Rest	0.1	0.2	0.01	0.4	0.02	5.5	7.0	-	0.2	0.2
CuSn8	CW453K	EN 1652/1654	Rest	0.1	0.2	0.01	0.4	0.02	7.5	8.5	-	0.2	0.2
CuSn3Zn9	CW454K	EN 1654	Rest	0.1	0.2	-	0.2	0.10	1.5	3.5	7.5	10.0	0.2

NOTE / EN 1652 i EN 13599: The total of other elements, except Cu, is defined as the sum of the quotas on Ag, As, Bi, Cd, Co, Cr, Fe, Mn, Ni, O, P, Pb, S, Sb, Se, Si, Sn, T'i Zn excluding any element for which a value is individually specified.

BRONZE TAPE: FEATURES AND SPECIFICATIONS

PRODUCTION CAPABILITIES AND TECHNICAL PROPERTIES

We at VINCO specialize in narrow strip cutting. We have a service center consisting of 8 slitting lines and other lines for secondary operations. When we talk about slitting range, we take into account both thickness and nominal width, which for some materials can be up to 6 mm. Another feature available to customers is the choice of different edges or special edges depending on their needs: sheared edge (GK) or special edges (SK), killed edge/edge, rounded edge/edge.

Bronze strips are suitable for industrial applications and are composed of copper and tin alloys and sometimes zinc. All chemical compositions are subject to the standard (s/EN 1652/1654) that specifies the composition, characteristics and dimensional tolerances of copper alloy tapes for general use.

To find out the weight of the coil of bronze tape, we have a weight calculator that facilitates the calculation by taking into account the inner and outer diameter based on the specific gravity of the material. In the case of bronze, regardless of delivery size, the value is 8.9 kg/dm³, which, along with copper tape, is the densest. This will give a more accurate figure with reference to weight.

strapping-bronze-vinco-strap

FINISHES AND COATINGS

The bronze strip can be supplied with different finishes and coatings as specified in the Standard. This type of strip is supplied with tin coatings:

Electrolytic subject to standard s/EN 14436 which deals with the types of coatings for copper alloy composite strips: bright, matte and reflow polishing. Depending on the coating thicknesses, the improvement of soft solderability and corrosion resistance will be determined.
In hot subject in the standard s/EN 13148 which details the ranges of thicknesses of coatings for which a series of applications are determined: protection against surface oxidation, against corrosion, increase of the useful life and aid to soft welding.

All details about the coatings subject to Standard for bronze strapping can be found in the finishing tab although the final result does not affect the suitability of the strap. VINCO offers the possibility of requesting a special coating agreed at the time of purchase.

			APPROXIMATE INTERNATIONAL EQUIVALENTS
Classification of symbols	Numerical classification	European Standard (EN)	US (AISI)	Japan (JIS)	China (GB)
CuSn4	CW450K	EN 1652/1654
CuSn6	CW452K	EN 1652/1654	C51900	C 5191
CuSn8	CW453K	EN 1652/1654
CuSn3Zn9	CW454K	EN 1654	C42500

MECHANICAL PROPERTIES BRONZE STRIP EN 1652 / EN 1654

Designations			Tensile strength Rm		Conventional yield strength at 0.2% Rp_0.2	Elongation		HV hardness
Designations			N/mm²		Conventional yield strength at 0.2% Rp_0.2	A₅₀mm for thicknesses up to 2.5 mm (inclusive) %	A for thicknesses above 2.5 mm %	HV hardness
Material		Metallurgical condition	min.	max.	N/mm²	A₅₀mm for thicknesses up to 2.5 mm (inclusive) %	A for thicknesses above 2.5 mm %	min.	max.
Classification of symbols	Numerical classification	Metallurgical condition	min.	max.	N/mm²	min.	min.	min.	max.
		R290	290	390	(max. 190)	40	50	-	-
		H070	-	-	-	-	-	70	100

		R390	390	490	(min. 210)	11	13	-	-
		H115	-	-	-	-	-	115	155

CuSn4	CW450K	R480	480	570	(min. 420)	4	5	-	-
		H150	-	-	-	-	-	150	180

		R540	540	930	(min. 490)	3	-	-	-
		H170	-	-	-	-	-	170	200

		R610	610	-	(min. 540)	-	-	-	-
		H190	-	-	-	-	-	190	-
		H350	350	420	(max. 300)	45	55	-
		H080	-	-	-	-	-	80	110

		R420	420	520	(min. 260)	17	20	-	-
		H125	-	-	-	-	-	125	165

		R500	500	590	(min. 450)	8	10	-	-
		H160	-	-	-	-	-	160	190
CuSn6	CW452K
		R560	560	650	(min. 500)	5	-	-	-
		H180	-	-	-	-	-	180	210

		R640	640	730	(min. 600)	3	-	-	-
		H200	-	-	-	-	-	200	230

		R720	720	-	(min. 690)	-	-	-	-
		H220	-	-	-	-	-	220	-
		R370	370	450	(max. 300)	50	60	-	-
		H90	-	-	-	-	-	90	120

		R450	450	550	(min. 280)	20	23	-	-
		H135	-	-	-	-	-	136	175

		R540	540	630	(min. 460)	13	16	-	-
		H170	-	-	-	-	-	170	200
CuSn8	CW453K
		R600	600	690	(min. 530)	5	7	-	-
		H190	-	-	-	-	-	190	220

		R660	660	750	(min. 620)	3	-	-	-
		H210	-	-	-	-	-	210	240

		R740	740	-	(min. 700)	2	-	-	-
		H230	-	-	-	-	-	230	-
		R430	430	520	(330)	6	8	-	-
		H140	-	-	-	-	-	140	170

		R510	510	600	(430)	3	5	-	-
		H160	-	-	-	-	-	160	190
CuSn3Zn9	CW454K
		R580	580	690	(520)	-	2	-	-
		H180	-	-	-	-	-	180	210

		R660	660	-	(610)	-	-	-	-
		H200	-	-	-	-	-	200	8

NOTE 1- The numbers in brackets are not requirements of the standard and are given for information purposes only.

BARE MATERIAL

The strips must be clean and free of detrimental defects, which must be specified by agreement between the customer and the supplier when requesting the quote and in the order. Normally, a small residual layer of lubricant is left on cold-rolled products, which is authorised unless otherwise specified.

ROUGHNESS EN 1654

This must be agreed between the customer and the supplier when requesting the quote and confirming the order.

SURFACE CONDITION EN 13599

The strips must be clean and free of detrimental defects, which must be specified by agreement between the customer and the supplier in the request for quotes and in the order. Normally, a small residual layer of lubricant is left on cold-drawn products, and this is acceptable unless otherwise specified. Discolouration is acceptable, provided that it is not detrimental to the use of the product.

TIN COATINGS

Tin coatings for strips and copper strips and copper alloys:

Type of coating	Standard
Electrolytic	EN 14436
Hot dip	EN 13148

ELECTROLYTIC EN 14436

ELECTROLYTIC TIN PROCESS TYPES AND TYPES OF TIN COATINGS AND TIN ALLOYS EN 14436

Process	Description
Process for matt electrolytic coatings.	This is the standard finish of a traditional electrolytic bath.
Process for bright electrolytic coatings.	Coatings with a bright appearance are obtained using baths that contain one or more suitable brightening agents (brighteners). Their presence may not be desirable in subsequent melting or soft soldering processes. Furthermore, they may be beneficial for frictional properties (low friction or sliding contacts).
Process for flow-brightened electrolytic coatings.	Flow-brightened electrolytic coatings are obtained by heating a matt electrolytic coating above its melting point for a few seconds and then cooling it. The coatings preserve their sheen after cooling. In practice, flow brightening is not used for coatings with thicknesses above 5 μm (slip risk) or for coatings that are already bright.

NOTE - Tin electrolytic coatings may experience a spontaneous growth of metallic filaments (the combined effect of humidity and mechanical stresses, for example). This phenomenon is highly undesirable for electrotechnical applications (risk of short circuit). The risk of this occurring can be reduced by flow brightening, using tin-lead alloy coatings or inserting a suitable sublayer.

TYPES OF STEEL ELECTROLYTIC COATINGS AND TIN ALLOYS ACCORDING TO APPLICABLE EN 14436

Coating thickness μm		Types of coatings
min.	max.	Sn bright (Snb)	Sn matt (Snm)	Sn flow-brightened (Snf)
	1	As	N/A	As
0.8	1.2	As	N/A	*
1.5	2.5	B	As	B - R
2	4	B - C	R	B - R
3	6	B - C	R	N/A
5		B - C	R - C	N/A

NOTE 1: Applications:

N/A: not applicable
B: improves the suitability for soft soldering
*: reduces frictional forces
C: corrosion resistance
R: reduction of electrical resistance on a contact
As: improved appearance

NOTE 2: These typical values are for information purposes and can be replaced by agreement between the customer and the supplier.

COMPOSITION OF THE TIN AND TIN ALLOYS EN 14436

Type of coating	Designation of the material	Composition in % (mass fraction)
Type of coating	Designation of the material	Min. Sn	Others, total
Sn bright (Snb)	Sn99	99	Remainder
Sn matt (Snm) or Sn flow-brightened (Snf)	Sn99.50	99.5	Remainder

HOT DIP EN 13148

APPEARANCE EN 13148. HOT DIP TINNING

Thicknesses (average values) and preferred thickness ranges for coatings:

Thickness	Thickness range		Application
µm	µm
average value	from	up to & including
1.45	0.7	2.2	Preventing surface oxidation, decorative appearance, reducing frictional forces.
2	1	3	Preventing surface oxidation, decorative appearance, reducing frictional forces.
3.5	2	5	Preventing corrosion
5	3	7	Extending the useful life
7.5	5	10	To aid soft soldering
10	7	13	To aid soft soldering

The appearance depends on the type of liquid film cooling, the type of coating and the technique used to remove excess molten metal. The surface may have a bright or matt appearance, or a combination of both. The appearance of the coating does not affect its suitability. If there are special requirements for the appearance of the coating, these requirements must be agreed at the time of the quote and/or order.

THICKNESS TOLERANCES EN 13599 / EN 1652

Nominal thickness		Thickness tolerance for nominal widths according to EN 13599/ EN 1652
>	≤	10 < and ≤ 200		200 < and ≤ 350	350 < and ≤ 700	700 < and ≤ 1000	1000 < and ≤ 1250
>	≤	normal (Class A)	special (Class B)	200 < and ≤ 350	350 < and ≤ 700	700 < and ≤ 1000	1000 < and ≤ 1250
0.05¹⁾	0.1	± 10% ²⁾	-	-	-	-	-
0.1	0.2	± 0.010	± 0.007	± 0.015	-	-	-
0.2	0.3	± 0.015	± 0.010	± 0.020	± 0.03	± 0.04	-
0.3	0.4	± 0.018	± 0.012	± 0.022	± 0.04	± 0.05	± 0.07
0.4	0.5	± 0.020	± 0.015	± 0.025	± 0.05	± 0.06	± 0.08
0.5	0.8	± 0.025	± 0.018	± 0.030	± 0.06	± 0.07	± 0.09
0.8	1.2	± 0.030	± 0.022	± 0.040	± 0.07	± 0.09	± 0.10
1.2	1.8	± 0.035	± 0.028	± 0.06	± 0.08	± 0.10	± 0.11
1.8	2.5	± 0.045	± 0.035	± 0.07	± 0.09	± 0.11	± 0.13
2.5	3.2	± 0.055	± 0.040	± 0.08	± 0.10	± 0.13	± 0.17
3.2	4.0	-	-	± 0.10	± 0.12	± 0.15	± 0.20
4.0	5.0	-	-	± 0.12	± 0.14	± 0.17	± 0.23
5.0	6.0	-	-	± 0.14	± 0.16	± 0.20	± 0.26

Measurements in mm.
1) Including the value 0.05.
2) ± 10% of the nominal thickness

THICKNESS TOLERANCE FOR COATED MATERIAL

EN 13148. The thickness of the tinned strip must meet the required combination of tolerances for the thickness of the strip (table above) and the range of thicknesses of the coatings ordered, for both sides.

EN 14436. The thickness of the strip prior to tinning must be in accordance with the approximate tolerances given in the table above. The thickness tolerance of the tinned strip must take into account the minimum and maximum thicknesses of the coating.

WIDTH TOLERANCES OF THE STRIPS

Nominal thickness t		Standard slitting tolerances for VINCO ²⁾				Width tolerances for nominal widths according to EN 13599/ EN 1654
<	≤	3-15	15-50	50-150	>150	up to & including 50	over 50 and up to 100 inclusive	over 100 and up to 200 inclusive	over 200 and up to 350 inclusive	over 350 and up to 500 inclusive	over 500 and up to 700 inclusive	over 700 and up to 1250 inclusive
<	≤	3-15	15-50	50-150	>150	up to & including 50	over 50 and up to 100 inclusive	over 100 and up to 200 inclusive	over 200 and up to 350 inclusive	over 350 and up to 500 inclusive	over 500 and up to 700 inclusive	over 700 and up to 1250 inclusive	0,05	0,1	-	-	-	-	0;+0,2¹⁾	-	-	-	-	-	-
0,1	0,2	0;+0,15³⁾	0;+0,15³⁾	0;+0,15³⁾	0;+0,2³⁾	0;+0,2	0;+0,3	0;+0,4	0;+0,6	0;+1,0	0;+1,5	0;+2,0
0,2	0,4	0;+0,15	0;+0,15	0;+0,15	0;+0,2	0;+0,2	0;+0,3	0;+0,4	0;+0,6	0;+1,0	0;+1,5	0;+2,0
0,4	1	0;+0,17	0;+0,18	0;+0,2	0;+0,24	0;+0,2	0;+0,3	0;+0,4	0;+0,6	0;+1,0	0;+1,5	0;+2,0
1	1,5	0;+0,2	0;+0,2	0;+0,2	0;+0,3	0;+0,3	0;+0,4	0;+0,5	0;+1,0	0;+1,2	0;+1,5	0;+2,0
1,5	2	on request	0;+0,26	0;+0,3	0;+0,32	0;+0,3	0;+0,4	0;+0,5	0;+1,0	0;+1,2	0;+1,5	0;+2,0
2	2,5	on request	0;+0,26	0;+0,3	0;+0,32	0;+0,5	0;+0,6	0;+0,7	0;+1,2	0;+1,5	0;+2,0	0;+2,5
2,5	3	on request	on request	0;+0,32	0;+0,35	0;+1,0	0;+1,1	0;+1,2	0;+1,5	0;+2,0	0;+2,5	0;+3,0
3	5	on request	on request	0;+0,32	0;+0,35	0;+2,0	0;+2,3	0;+2,5	0;+3,0	0;+4,0	0;+5,0	0;+6,0

Measurements in mm.

1) Including the value t=0.05
2) Other, closer dimensional tolerances are possible under a commercial agreement .
3) Including the value t=0,1

LENGTH TOLERANCES 13599

Length tolerances of thick sheets, thin sheets and strips in cut lengths of up to 5000mm.

Length	Nominal thickness	Length tolerance
Without rolling (M)	up to & including 25	±50
Fixed length (F)	5 and above	0; +10
Fixed length (F)	over 5 and up to 10 inclusive	0; +15

Measurements in mm.

EDGE CAMBER TOLERANCES

Nominal width (W)	Edge curve tolerances under commercial agreement		Edge curve tolerances according to the EN 13599 Standard
	Maximum deviation 1000 mm Thickness (t)		Maximum deviation 1000 mm Thickness (t)


	t ≤ 1.20 mm	t > 1.20 mm	t ≤ 0.5 mm	0.5 < t ≤ 1.20 mm	1.20 < t ≤ 2.50 mm	2.50 < t ≤ 3.20 mm	3.20 < t ≤ 5.00 mm
3 ≤ W < 6	2.50	4.00	-	-	-	-	-
6 < W ≤ 10	2.00	3.00	-	-	-	-	-
10 < W ≤ 15	1.00	1.50	7.00 ¹⁾	10.00	-	-	-
15 < W ≤ 20	1.00	1.50	4.00	6.00	8.00	-	-
20 < W ≤ 30	0.50	1.00	4.00	6.00	8.00	-	-
30 < W ≤ 50	0.50	1.00	3.00	4.00	6.00	7.00	*under a commercial agreement
50 < W ≤ 350	0.50	1.00	2.00	3.00	4.00	5.00
350 < W ≤ 1250	-	-	2.00	3.00	4.00	5.00

Measurements in mm.
1) Including nominal width 10mm.

* The data contained in this catalogue are for information purposes only and are not under any circumstances, contractual supply conditions. Errors and omissions excepted.