Product
Product Details
IS 318 HTB2 Naval Brass Casting
IS 318 HTB2 Naval Brass Casting – Grade 2
IS 318 HTB2 Naval Brass Casting – Grade 2
IS 318 HTB2 (High Tensile Brass Grade 2) is the Indian standard Naval Brass casting grade, directly equivalent to C46400 (USA) and CC768S (EN 1982). The 0.5–1.0% tin addition inhibits dezincification in seawater and water service, providing 380 MPa tensile strength with good corrosion resistance for marine deck hardware, sea cocks, through-hull fittings, and marine plumbing castings produced at Indian foundries for domestic and export markets.
Alloy Overview
IS 318 HTB2 specifies Cu 59–62%, Zn balance (~38%), Sn 0.5–1.0%, Pb max 0.20%. The tin-inhibited dezincification resistance, combined with tensile strength of 380 MPa and machinability of 40–50% CDA, makes HTB2 the preferred Indian standard grade for marine structural and plumbing castings. IS 318 HTB2 corresponds to the international C46400/CC768S naval brass in all key properties.
Material Composition – IS 318
| Element | Min % | Max % | Typical % | Role |
|---|---|---|---|---|
| Copper (Cu) | 59.0 | 62.0 | 60.5 | Primary matrix, corrosion resistance |
| Zinc (Zn) | Balance | Balance | ~38.5 | Strength, castability |
| Tin (Sn) | 0.50 | 1.0 | 0.75 | Dezincification inhibitor, strength |
| Lead (Pb) | – | 0.20 | 0.10 | Minor machinability aid |
| Iron (Fe) | – | 0.10 | 0.05 | Impurity |
| Aluminium (Al) | – | 0.05 | – | Impurity |
| Nickel (Ni) | – | 0.20 | – | Minor |
| Manganese (Mn) | – | 0.10 | – | Impurity |
| Silicon (Si) | – | 0.05 | – | Impurity |
| Arsenic (As) | – | 0.05 | – | Optional DZR enhancer |
Mechanical Properties
| Property | Sand Cast | Die Cast | Standard |
|---|---|---|---|
| Tensile Strength (MPa) | 380 min | 420 min | IS 318 |
| Yield Strength (MPa) | 140 | 170 | IS 1608 |
| Elongation (%) | 20% | 22% | IS 1608 |
| Hardness (HB) | 80–110 | IS 1756 | |
| Density (g/cm³) | 8.50 | – | |
| Electrical Conductivity (%IACS) | 22–25 | – | |
| Melting Range (°C) | 880–900 | – | |
| Machinability (%) | 40–50 | CDA scale | |
International Equivalent Grades
| Standard | Designation | Name |
|---|---|---|
| India (IS 318) | HTB2 | Naval Brass Grade 2 |
| USA (ASTM B584) | C46400 / CDA 464 | Naval Brass Casting |
| Europe (EN 1982) | CC768S | CuZn38Sn1-C |
| Germany (DIN 1709) | CuZn38Sn1-C | Sondermessing (naval) |
| UK (BS 1400) | HTB1 | High Tensile Brass Casting |
| Japan (JIS H5111) | C4622 | Naval Brass Casting |
| ISO | CuZn38Sn1-C | Naval Brass Casting |
| China (GB/T 1176) | ZCuZn38Sn1 | 铸造海军黄铜 |
Applications
IS 318 HTB2 naval brass castings: marine through-hull fittings; sea cocks; boat deck hardware; propeller shaft hardware; seawater pump casings; marine heat exchanger water box covers; offshore electrical conduit bodies; marine valve bodies; Indian Navy and Coast Guard vessel hardware; and export marine hardware to European and Asian markets.
Pricing
US$ 11.50 per kilogram (CIF, indicative). MOQ: sample 1 pc; production 50 pcs.
Quality
IS 318 HTB2; EN 1982 CC768S; ASTM B584 C46400; ISO 6509 dezincification test available; ISO 9001:2015; spectrometric analysis; hydrostatic pressure test on valve and fitting castings. ISO 9001:2015. EN 10204 3.1 MTR.
Related IS 318 Grades
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Price: US$ 11.50/kg. Email: info@elecaccs.com | www.elecaccs.com
