- BRONZ1 TECHNICAL REPORT -Lead-free brass alloy
Registered into ASTM, UNS No. C89720(For casting)Rev. 2013.1.28

Copyright 2012 Joetsu Bronz1 corporation
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New Copper Alloy “NEXT BRASS”
Earth Friendly Materials – Lead -Free Brass for CastingIn recent years, lead regulations have become strict gradually to reduce the amount of lead elution from water facilities, and also
have been discussed in the United States. President Obama has officially signed the bill for the application of the new standardNSF61 Annex G in January 2011. This has enhanced to ensure that the lead controls of the parts related to water will become
more strict from 2014 and will be amended to read that the content of lead for the pipes, fittings and drinking systems shall be“0.25% Max lead content weighted average of the products.” "NEXT BRASS" newly developed by us can satisfy these regulationand can keep you living in safe.
Table.1

1. INTRODUCTION
NEXT BRASS has been developedwith the concept “earth-friendlymaterials” and developed along thefollowing three themes.

NEXT BRASSOverview

Japanese PatentPublication No.

CDA
UNS No.

NEXT BRASS –CC

Lead Free Brass forContinuous Casting

2012-207255

C89720NEXT BRASS -SC(In)

Lead Free Brass forCasting

2012-207255

C89720

3. CHEMICAL COMPOSITION
Chemical composition for NEXTBRASS is shown in Table 2.

1.1 SAFETY
・Lead Free・Corrosion Resistance- NEXT BRASS is harmlessfor health because this alloyis lead free and has an excellent
corrosion resistance.

Table.2

1.2 ENVIRONMENT・Recycling
・Energy Conservation- Alloy that can be recycled lead-freealloy.
- Alloy that can contributeto energy conservation.
1.3 QUALITY
・Cost-Down- NEXT BRASS is lower cost materials
than bronze.
And its mechanical properties
are the same or superior
to bronze.

2. NEXT BRASS SERIES
There are two types of NEXTBRASS.
One is for hot working and another one isfor casting. This technical report explains
the thing for casting.
NEXTBRASS for casting is the alloy
which can use it for sand casting andcontinuous casting,is registered into ASTM in U.S. ,and also
finished processof patent application in Japan .
It is shown in Table 1.

Chemical Composition (wt%)

CuSnPbZnAlSiSbBiMax/MinR

0.6
-1.5

≦0.09

26.0
-32.0

0.35
-1.5

0.4
-1.0

0.02
-0.20

0.5-2.0B[ppm]
5-100Casting

R

1.0

≦0.09

29.8

0.5

0.5

0.07

0.7

10

ContinuousCasting

R

1.0

≦0.09

29.0

0.5

0.5

0.07

1.5

10

4. USE CASE
4-1 Plumbing Components
・Faucets ・Water meter ・Fittings ・Valves ・Elbows ・Tees
4-2 Industrial Machinery Parts
・Various Bush ・Shaft ・Pump Component
・Alternative for Brass
・Automobile-related Parts ・Strainer
5. CORROSION RESISTANCE
5-1 Erosion-Corrosion Resistance
The result of erosion-corrosion resistance test is shown in fig1, fig2.
You can see that NEXTBRASS can provide an excellent erosioncorrosion resistance equivalent to the bronze by adding Tin.

Copyright 2012 Joetsu Bronz1 corporation2
www.nextbrass.com ※ This data may be changed without notice.

CuCl2・2H2O 99%

Concentration

190g reagent in 15L dissolved water(1wt %)

Temperature

40℃±1℃

Flow velocity

3.3ｍ/sec

Flow Rate

400ml/minCorrosion time

5hoursAir blown

2L/minCorrosion Weight Loss (g)Reagent

1.2

1.2

1.0

1.0

0.8

0.8

0.6

0.60.40.4Corrosion Weight Loss

0.20.2

Maximun Erosion Depth

0.0

Maximum Erosion Depth (μm)

Fig3 Tin Content and Erosion-Corrosion

Table.3 Test Condition

0.000.2

0.4

0.6

0.81Tin Content (%)＊Photo After the Test ＊5-3 Dezincification ResistanceDezincification resistance of NEXTBRASS can provide an
excellent dezincification resistance below 100 μm. (Fig4)*Corresponding to Grade A; standard EN**Test Method: According to ISO6509-1981

1000

1000
800
600

1304

≦10 μm

C36000≦10 μm

C8785040NEXTBRASS(C89720)50
C87850(C89720)

50C89844

0

Fig4 Dezincification Resistance
1600
1400
1200
1000
800
600
4002000C89844

400200.
Maximum Dezincification
Depth (μm)

1200

NEXTBRASS

Maximum Erosion Depth (μm)

Fig1 Erosion-Corrosion(1)Corrosion Weight Loss (mg)Fig2 Erosion-Corrosion(2)
1000
850
800
600
350

400300

6. STRESS CORROSION CRACK SENSITIVITY
Stress Corrosion Crack Test
The taper screw combination is shown in Table4.

200

C87850

C89844(C89720)

NEXTBRASS

0

Table.4 Test Condition (Ref. ASTM B858)

5-2 Tin Content and Erosion-Corrosion
We revealed that erosion-corrosion resistance isgood that the tin(Sn) content of 1.0%.
The test result is shown in Fig3,

Shape

φ20.7×28mm-Rc3/8

Tightening
torque7.5 N・mAtmosphere

Ammonia vapor atmosphere at room
temperature(12%NH3 Solution)

PhotographCriterion

The presence or absence of cracks thatis observed visually or microscopic

It’s tighten constanttorque and beexposed ammonia
vapor atmosphere.
Then we checked
the presenceor absence of cracks
that is observed
visually or
microscopic at thespecific time.
The test result isshown in Fig5.

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Fig5 Test Result

Hours300(HB10/1000)

250

120200100150

102
7780100508Fig8 Brinell Hardness5760400C85700

C87850

C89844

NEXTBRASS(C89720)

200
NEXTBRASS-SC

NEXTBRASS compared with C85700
which cracked in 8 hours. There is nocrack after 312 hours at theNEXTBRASS.

C87850

7-2 Continuous Castings’
Fig9 Tensile Strength[MPa]

7. MECHANICAL ROPERTIES
Mechanical properties of NEXTBRASS are equivalent or superior to thelead-free bronze casting’s (C89844).
Mechanical properties of sand moldcastings’ are shown in Fig6,7 and 8. And
continuous castings’ are shown in Fig9,10
and 11. The specimen was collected bysand mold of CO2, or test mold of type Eor B.

C89844(C89720)

600
400

500
400

320

300

290

200
1000
NEXTBRASS-CC

7-1 Sand Mold Castings’
Fig6 Tensile Strength

[MPa]
500

400

400

Fig10 Elongation

[%]

25270

300
250

282520196200333530

350

15150

10100

55000
NEXTBRASS-SC

C89844

NEXTBRASS-CC

C87850

Fig7 Elongation[%]

C89844

C87850(C89720)(C89720)(HB10/1000)

Fig11 Brinell Hardness

16040

14035

283020C87850

40450

25

C89844(C89720)20100

19102120

8880

1560

104078

20500
NEXTBRASS-SC(C89720)

C89844

C87850

NEXTBRASS-CC

C89844

C87850(C89720)

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8. MACHINABILITY
8-1 Measurement of Cutting Resistance
The result of Measurement of cutting resistance ofNEXTBRASS is shown in Fig12 and 13.

9. METALLOGRAPHIC STRUCTURE
The metallographic structure of NEXTBRASS isshown in Fig14, Fig15. It is mainly composed with α-phase and κ-phase.
Fig14<Cutting Condition >Outer Diameter Cutting
・Dry・Depth of cut ; 1.0m・Feed ; 0.1 mm/rev
・Chip ; TNGG160404L-C・Work material ; φ18 rod

Sand Castings

Principal Force (N)Fig12 Cutting Resistance180160140120100806040200145118
Fig15 Continuous Castings

NEXTBRASS(C89720)

Drill Hole・Load ; 2.5kgf , N=10・Drill ;φ5・Depth ; 5mm
Time of Drill Hole （Sec)

50μm
133

C89844

C8785050μm

Fig13 Drill Test

12108.8
7.2864.6420NEXTBRASS(C89720

C89844

C87850

8-2 The Shape of the Chips
Bismuth grains and κ-phase acts as a chip breaker,
and then divide the chips..
＊Photo of Chips ＊α-phase ; Whitish part in the photographκ-phase ; Lamellar shaped portion of the blue in the photograph
Bismuth ; Shaped portion of the black point

10. CASTABILITY
10-1 Solid-Liquid Phase Line Temperature
Solid-liquid phase line temperature of NEXTBRASS isshown in Table5.
The NEXTBRASS properties have become closer tobrasses. (Table 5)
Table 5 Solid-Liquid Phase LineTemperatureUnit : ℃(Ｆ)NEXTBRASS

C89844

Liquid Linetemperature

918 (1684F)

1010(1850F)

Solid line
temperature

873 (1603F)

853(1550F)

Width of thesolid-liquid

45 (81F)

167(300F)

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10-2 Flow Length Test
Cast into the spiral molding mold of our CO2 sand mold, and then, we measured the flow length.
The measurement result is shown in Fig16.
Fig16 The Result of Flow Length Test

Distance of Flow [cm]10090

NEXTBRASS

80

C8785070

C8984460504030201000255075100125150

175200225250⊿T(Positive Temperature Defference from the Liquidus )[℃]

10-3 Stair-Step Test
Flaw detection test results of the stair shaped test specimen, and macro observation.
C89844

C89844

C87850C87850

NEXTBRASS-SC

NEXTBRASS-SC

10-4 Casting Case・ Water Meter

・Strainer

・Water Shutoff Valve

Copyright 2012 Joetsu Bronz1 corporation
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