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City:ningbo

Province/State:zhejiang

Country/Region:china

Contact Person:MrJikin Cai

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China ASME SB111 C68700 Seamless Tube, OD 10-50mm, for Seawater Desalination Condenser wholesale

ASME SB111 C68700 Seamless Tube, OD 10-50mm, for Seawater Desalination Condenser

Name: ASME SB111 C68700 Seamless Tube OD 1050mm for Seawater Desalination Condenser
Brand: Yuhong
Price: 1 USD

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Brand Name :Yuhong

Model Number :ASME SB111 C68700 Seamless Brass Tubes

Certification :ABS, BV, DNV-GL , PED, TUV, LR, KR, NK, CCS.

Place of Origin :China

MOQ :100 kgs

Price :Negotiable

Payment Terms :L/C, T/T

Supply Ability :800 Tons/ month

Delivery Time :30 days

Packaging Details :Ply-wooden Case /Iron Case/ Bundle with plastic Cap etc.

Standard :ASME SB111

Shape :Round

Length :6m -12m, Customers' requirement

Testing :Flattening Test, Expansion Test, Mercurous Nitrate Test, Ammonia Vapor Test, Chemical Analysis, Grain Size, Tension Testing

Application :Shell and tube heat exchanger ASME standard

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ASME SB111 C68700 Seamless Tube, OD 10-50mm, for Seawater Desalination Condenser

C68700 is an aluminum brass alloy with arsenic addition, specifically designed for harsh environments such as seawater desalination. Its composition (Cu: 76-79%, Al: 1.8-2.5%, As: 0.02-0.06%, Zn: balance) ensures exceptional corrosion resistance in seawater and high thermal conductivity. The arsenic content further enhances resistance to dezincification, a critical feature for long-term durability in marine applications.

The production process of Brass Tube

Raw Materials
Melting&Casting
Extrusion
Rolling
Intermediate Heat Treatment 1
Straightening
Three-line Drawing
Acid Washing
Intermediate Heat Treatment 2
Two Cascade Drawing
Cutting&Cleaning
Eddy Current Test
Final Heat Treatment
Packing
Shipping

Comparison Table of Brass Tube Alloy

Implementation Standard	Alloy Specifications
GB/T 5231	HAI 77-2
GB/T 5231	HSn70-1, HSn72-1
ASTM B111	C68700
ASTM B111	C44300
BS EN12451	CuZn20Al2As
BS EN12451	CuZn28Sn1As
JIS H3300	C6870, C6871, C6872
JIS H3300	C44300
AS 1569	C68700
AS 1569	C44300

Chemical Composition of Brass Tube Alloys

Implementation Standard	Alloy	Cu (%)	Al/Sn (%)	As (%)	Fe (%)	Pb (%)	Other Impurities (%)	Zn (%)	Total Impurities (%)
GB/T 5231	HAl77-2	76.0-79.0	1.8-2.5 (Al)	0.02-0.06	≤0.06	≤0.07	≤0.07 (Other)	Balance	≤0.6
ASTM B111	C68700	76.0-79.0	1.8-2.5 (Al)	0.02-0.06	≤0.06	≤0.07	≤0.07 (Other)	Balance	≥99.5 (Sum)
ASME SB111	C68700	76.0-79.0	1.8-2.5 (Al)	0.02-0.06	≤0.06	≤0.07	≤0.07 (Other)	Balance	≥99.5 (Sum)
JIS H3300	C6870	76.0-79.0	1.8-2.5 (Al)	0.02-0.06	≤0.05	≤0.05	≤0.05 (Other)	Balance	-
JIS H3300	C6871	76.0-79.0	1.8-2.5 (Al)	0.02-0.06	≤0.05	≤0.05	≤0.05 (Other); Si: 0.20-0.50	Balance	-
JIS H3300	C6872	76.0-79.0	1.8-2.5 (Al)	0.02-0.06	≤0.05	≤0.05	≤0.05 (Other); Ni: 0.20-1.0	Balance	-
BS EN12451	CuZn20Al2As (CW702R)	76.0-79.0	1.8-2.3 (Al)	0.02-0.06	≤0.07	≤0.05	Ni ≤0.1; P ≤0.01; Mn ≤0.1; ≤0.3 (Other total)	Balance	-
AS 1569	C68700	76.0-79.0	1.8-2.5 (Al)	0.02-0.06	≤0.06	≤0.07	≤0.07 (Other)	Balance	-
GB/T 5231	HSn70-1	69.0-71.0	0.8-1.3 (Sn)	0.03-0.06	≤0.10	≤0.05	≤0.05 (Other)	Balance	≤0.3
GB/T 5231	HSn72-1	70.0-73.0	0.9-1.2 (Sn)	0.02-0.06	≤0.06	≤0.07	≤0.07 (Other)	Balance	≤0.4
ASTM B111	C44300	70.0-73.0	0.9-1.2 (Sn)	0.02-0.06	≤0.06	≤0.07	≤0.07 (Other)	Balance	≥99.6 (Sum)
ASME SB111	C44300	70.0-73.0	0.9-1.2 (Sn)	0.02-0.06	≤0.06	≤0.07	≤0.07 (Other)	Balance	≥99.6 (Sum)
JIS H3300	C4430	70.0-73.0	0.9-1.2 (Sn)	0.02-0.06	≤0.05	≤0.05	≤0.05 (Other)	Balance	-
BS EN12451	CuZn28Sn1As (CW706R)	70.0-72.5	0.9-1.3 (Sn)	0.02-0.06	≤0.07	≤0.05	Ni ≤0.1; P ≤0.01; Mn ≤0.1; ≤0.3 (Other total)	Balance	-
AS 1569	C44300	70.0-73.0	0.8-1.2 (Sn)	0.02-0.06	≤0.06	≤0.07	≤0.07 (Other)

Primary Applications in Seawater Desalination

Heat Exchangers and Condensers
- C68700 tubes are widely used in multi-stage flash (MSF) and reverse osmosis (RO) systems. Their high thermal conductivity (64 BTU·in/(hr·ft²·°F)) ensures efficient heat transfer between seawater and desalination equipment
- The seamless structure eliminates weld seams, reducing leakage risks in high-pressure environments
Corrosion Resistance
- The aluminum content forms a protective oxide layer, while arsenic prevents dezincification. This combination allows the tubes to withstand saltwater, chlorine, and sulfide exposure, even at high flow velocities
- Example: In seawater intake pipelines, C68700 resists pitting and crevice corrosion, extending equipment lifespan
Mechanical Performance
- Tensile Strength: 345–600 MPa (minimum 345 MPa for annealed tubes)
- Yield Strength: 125–540 MPa, suitable for high-pressure condensers and evaporators.
- Fatigue Resistance: Maintains structural integrity under cyclic thermal and mechanical stresses.

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