ISO 6708/ASME B36.19m/DIN 86019 C70600 CuNi 90/10 C71500 CuNi 70/30 Copper - Nickel Tube

• Customization: Available
• Type: Copper Pipe
• Standard: AISI, ASTM, DIN, JIS, GB
• Model NO.: ISO 6708/ASME B36.19M/DIN 86019 Copper-Nicke Tube
• Composition: Brass Copper
• Technique: Forged/ Hot Press
• Shape: Round/Customized
• Surface Treatment: Smooth/as Per Client′s Design
• Special Use: High-strength Steel Plate, Wear Resistant Steel, Silicon Steel, Cold Heading Steel, Free Cutting Steel, Mold Steel
• Application: Building, Sanitation, Seawater Desalination
• Model Number: C70600 CuNi 90/10 C71500 CuNi 70/30
• Length: 10mm-12000mm
• Process: Bending, Decoiling, Welding, Punching, Cutting
• Diameter: 4mm, 6mm, 8mm, 10mm, 12mm, 15mm, 18mm, 22mm, 28mm,
• End: Plain End/Bevel End
• Test: BV, SGS Is Available
• Processing: Customized
• Wall Thickness: 1mm~220mm (Sch5X~Sch Xxs)
• Used: Factory, Decoration, Food
• Packing: Standard Sea Worthy Package
• Delivery Time: 10-30 Working Days
• Technical: Hot Rolled/Cold Drawn
• Outside Diameter: 8mm, 10mm, 12mm, 15mm, 18mm, 28mm, 35mm, 42mm, etc
• Color: White,Red
• MOQ: 1 Ton
• Transport Package: Woven Bag/Wooden Case
• Specification: Brass/Copper
• Trademark: EZS
• Origin: China
• Production Capacity: 1000000 Kgs/Year

Product Description

 

Product Description

C70600 CuNi 90/10 and C71500 CuNi 70/30 Copper - Nickel Tubes

1. Introduction

Copper - nickel alloys, such as C70600 (CuNi 90/10) and C71500 (CuNi 70/30), are widely used in various industries due to their excellent corrosion resistance, strength, and other unique properties. This analysis focuses on the characteristics, applications, and performance differences between these two types of copper - nickel tubes.

2. Chemical Composition

The chemical compositions of C70600 CuNi 90/10 and C71500 CuNi 70/30 are presented in the following table:

Alloy Designation	Cu (%)	Ni (%)	Fe (%)	Mn (%)	Other Elements
C70600 (CuNi 90/10)	88.6 - 90	9 - 11	1 - 1.4	0.5 - 1	Trace amounts of C, Pb, S, P, Zn, etc., with total impurities usually less than 0.5%
C71500 (CuNi 70/30)	69.5 - 70	29 - 33	0.4 - 1	0.5 - 1.5	Trace amounts of C, Pb, S, P, Zn, etc., with total impurities usually less than 0.5%

In C70600, the higher copper content gives it certain characteristics similar to copper, while the addition of nickel and other elements enhances its corrosion resistance and mechanical properties. In C71500, the increased nickel content further improves its performance in more severe corrosion and temperature conditions.

3. Physical and Mechanical Properties

3.1 Physical Properties

Property	C70600 (CuNi 90/10)	C71500 (CuNi 70/30)
Density (g/cm³)	Approximately 8.9	Slightly higher than C70600, around 8.94
Thermal Conductivity (W/(m·K))	Relatively good, but lower than pure copper	Slightly lower than C70600, which is beneficial for applications where heat transfer control is required
Electrical Conductivity	Good electrical conductivity, but lower than pure copper	Slightly lower electrical conductivity compared to C70600

3.2 Mechanical Properties

Property	C70600 (CuNi 90/10)	C71500 (CuNi 70/30)
Tensile Strength (MPa)	Minimum 260 - 360 (depending on temper)	Generally higher than C70600, with a minimum tensile strength of around 380 MPa (annealed condition)
Yield Strength (MPa)	Minimum 90 - 125 (depending on temper)	Higher than C70600, typically around 150 MPa (annealed condition)
Elongation (%)	Minimum 30	Also has good elongation, usually around 30% or more
Hardness	Varies with temper, usually in the range of 80 - 120 HV5	Slightly harder than C70600 in the same temper condition

The mechanical properties of these two alloys make them suitable for applications that require certain strength and formability. The higher nickel content in C71500 generally leads to higher strength and hardness, which is more suitable for more demanding environments.

4. Corrosion Resistance

Both C70600 and C71500 copper - nickel tubes exhibit excellent corrosion resistance in a wide range of environments, especially in seawater and many chemical media.

• Seawater Corrosion Resistance: In seawater, these alloys form a protective oxide film on the surface, which can effectively prevent further corrosion. C71500 with a higher nickel content has better corrosion resistance in more severe seawater environments, such as areas with high salt concentration, high - velocity seawater flow, or presence of certain corrosive substances.

• Resistance to Chemical Media: They are resistant to many organic compounds, salts, and diluted non - oxidizing acids. However, in strong oxidizing acid environments, their corrosion resistance may be reduced.

5. Applications

5.1 Industrial Condensers and Heat Exchangers

Both C70600 and C71500 are widely used in industrial condensers and heat exchangers. Their good heat transfer performance and excellent corrosion resistance ensure the long - term and stable operation of these equipment. For example, in power plants, refineries, and chemical plants, these copper - nickel tubes are used to transfer heat between different media while maintaining durability and preventing contamination.

5.2 Marine Applications

• Seawater Piping Systems: The resistance of these alloys to seawater corrosion and biofouling makes them ideal for seawater piping systems in ships, offshore platforms, and desalination plants. C70600 is commonly used in general marine applications, while C71500 is preferred in more corrosive marine environments, such as in areas with high - temperature and high - pressure seawater.

• Marine Hardware: They are also used to manufacture various marine hardware, such as propellers, shafts, and hull components. The high strength and corrosion resistance of these alloys ensure the reliability and long - service life of these parts in the harsh marine environment.

5.3 Other Applications

• Evaporating Equipment: In the food and beverage industry, pharmaceutical industry, and other fields where evaporation processes are involved, C70600 and C71500 copper - nickel tubes are used due to their corrosion resistance and ability to withstand the operating conditions of the evaporating equipment.

• Arms Industry and Mint Industry: Their unique properties also make them suitable for some applications in the arms industry and mint industry, where materials with high strength, corrosion resistance, and good formability are required.

6. Comparison between C70600 and C71500

• Cost: Generally, C70600 is relatively more cost - effective due to its lower nickel content. Nickel is a relatively expensive element, so as the nickel content increases in C71500, its cost is usually higher.

• Performance in Severe Conditions: C71500 outperforms C70600 in more severe corrosion and temperature conditions. If the application environment involves high - temperature seawater, high - velocity fluid flow, or exposure to strong corrosive substances, C71500 is a better choice.

• Formability: C70600 has slightly better formability in some cases due to its relatively lower nickel content. It is easier to be processed into complex shapes through methods such as bending, rolling, and stamping. However, both alloys can be processed by common metal processing methods.

7. Conclusion

C70600 CuNi 90/10 and C71500 CuNi 70/30 copper - nickel tubes are versatile materials with excellent corrosion resistance, good mechanical properties, and wide applications. The choice between them depends on various factors such as the specific application environment, cost requirements, and performance expectations. By understanding their characteristics and differences, engineers and designers can make more appropriate material selections to meet the needs of different projects.

 

 

 

 

ASTM Standards:

• B153 Test Method for Expansion (Pin Test) of Copper and Copper-Alloy Pipe and Tubing.
• B154 Test Method for Mercurous Nitrate Test for Copper and Copper Alloys.
• B170 Specification for Oxygen-Free Electrolytic Copper Refinery Shapes.
• B224 Classification of Coppers.
• B846 Terminology for Copper and Copper Alloys.
• B858 Test Method for Ammonia Vapor Test for Determining Susceptibility to Stress Corrosion Cracking in Copper Alloys.
• E8 Test Methods for Tension Testing of Metallic Materials E 8M Test Methods for Tension Testing of Metallic Materials [Metric].
• E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications.
• E53 Test Methods for Determination of Copper in Unalloyed Coppers by Gravimetry.
• E54 Test Methods for Chemical Analysis of Special Brasses and Bronzes.
• E62 Test Methods for Chemical Analysis of Copper and Copper Alloys (Photometric Methods.
• E75 Test Methods for Chemical Analysis of Copper-Nickel and Copper-Nickel-Zinc Alloys.
• E76 Test Methods for Chemical Analysis of Nickel-Copper Alloys.
• E112 Test Methods for Determining Average Grain Size E 243 Practice for Electromagnetic (Eddy Current) Examination of Copper and Copper-Alloy Tubes.
• E255 Practice for Sampling Copper and Copper Alloys for the Determination of Chemical Composition.
• E478 Test Methods for Chemical Analysis of Copper Alloys.
• E527 Practice for Numbering Metals and Alloys (UNS).

Chemical Composition:

Designation	Chemical Composition %
	Cu	Sn	Al	As	Ni	Fe	Mn	Pb max.	Zn
C44300	70.0-73.0	0.9-1.2	-	0.02-0.06	-	0.06 max	-	0.07	Rem
C68700	76.0-79.0	-	1.8-2.5	0.02-0.06	-	0.06 max	-	0.07	Rem
C70400	Rem	-	-	-	4.8-6.2	1.3-1.7	0.3-0.8	0.05	1.0max
C70600	Rem	-	-	-	9.0-11.0	1.0-1.8	1.0max	0.05	1.0max
C71500	Rem	-	-	-	29.0-33.0	0.4-1.0	1.0max	0.05	1.0max
C71640	Rem	-	-	-	29.0-32.0	1.7-2.3	1.5-2.5	0.05	1.0max

 

Tensile Requirements

Copper or Copper Alloy UNS NO.	Temper Designation		Tensile Strength	Yield Strength
	Standard	Former	min ksi	min ksi
C44300	O61	annealed	45	15
C68700	O61	annealed	50	18
C70400	H55	light-drawn	38	30
C70600	H55	light-drawn	45	15
C71500	O61	annealed	52	18
C71640	O61	annealed	63	25

 

Detailed Photos

 

 

 

Processing of Production