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ASME SB111 C68700 Seamless Brass Tubes for Desalination of Seawater

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ASME SB111 C68700 Seamless Brass Tubes for Desalination of Seawater

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 Brass Tubes for Desalination of Seawater

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

  1. Raw Materials

  2. Melting&Casting

  3. Extrusion

  4. Rolling

  5. Intermediate Heat Treatment 1

  6. Straightening

  7. Three-line Drawing

  8. Acid Washing

  9. Intermediate Heat Treatment 2

  10. Two Cascade Drawing

  11. Cutting&Cleaning

  12. Eddy Current Test

  13. Final Heat Treatment

  14. Packing

  15. Shipping

Comparison Table of Brass Tube Alloy

Implementation Standard

Alloy Specifications

​​GB/T 5231​​

​​HAI 77-2​​

​​HSn70-1, HSn72-1​​

​​ASTM B111​​

​​C68700​​

​​C44300​​

​​BS EN12451​​

​​CuZn20Al2As​​

​​CuZn28Sn1As​​

​​JIS H3300​​

​​C6870, C6871, C6872​​

​​C44300​​

​​AS 1569​​

​​C68700​​

​​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​​

​​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​​

​​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​​

  1. ​​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

  2. ​​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

  3. ​​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.

ASME SB111 C68700 Seamless Brass Tubes for Desalination of Seawater


Product Tags:

Aluminum Brass Tube ASTM SB111

      

C68700 Aluminum Brass Seamless Tubes

      

Evaporator Aluminum Brass Seamless Tubes

      
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