Non-Ferrous Casting Manufacturer in India

Esteem Auto casts aluminium alloys across the LM series from LM0 through LM31, together with tin bronzes, leaded bronzes, gunmetal, manganese bronze, aluminium bronze and brass, plus copper alloys. Alloy selection is driven by whether the part needs corrosion resistance, bearing performance, pressure tightness, light weight or electrical conductivity.

The full LM range is covered, including LM2, LM4, LM6, LM9, LM13, LM20, LM24, LM25 and LM31, with equivalents mapped to ISO, UK, French, German, Italian, Japanese and USA AA and ASTM designations. This lets an overseas buyer specify an alloy in their own standard and receive a matching casting without converting the grade themselves.

LM6 corresponds to A413, LM25 to A356, LM24 to A380 and LM4 to 319 in the USA AA and ASTM system. Japanese equivalents are AC3A, AC4C and AC4B/ADC10 respectively. Esteem Auto's aluminium grade table sets these equivalents out across seven national standards so a grade can be confirmed before ordering.

LM6 is an aluminium-silicon alloy of around 12 percent silicon, giving excellent fluidity, pressure tightness and corrosion resistance, which suits thin-walled and intricate castings. LM25 is an aluminium-silicon-magnesium alloy that responds to heat treatment and reaches higher strength, so it is chosen for structural and load-bearing components where mechanical properties matter more than castability.

Both are copper alloys, distinguished by the main alloying element. Brass is copper alloyed principally with zinc, giving good machinability and a lower cost. Bronze is copper alloyed principally with tin, and often lead, aluminium or manganese, giving better wear resistance, load capacity and seawater corrosion resistance, which is why bearings and marine parts are usually bronze.

Leaded bronzes perform best in sliding service because free lead acts as a solid lubricant. Cu-6Sn-6Zn-3Pb is a standard choice for bushes and bearings, while Cu-17Pb-4Sn-4Zn suits bearings running at high sliding speed. For high load with medium sliding speed, Cu-5Sn-5Zn-5Pb offers a wear and corrosion resistant balance.

Cu-10Sn-2Zn, a tin bronze commonly known as gunmetal, is a long-established choice for valves, pump bodies, gears and turbine components because it casts into complex shapes while remaining pressure tight and corrosion resistant. For more aggressive or higher-strength duty, aluminium bronze is normally specified instead.

Aluminium bronze such as Cu-9.4Al-4.5Fe-4.5Ni-1.5Mn combines high strength with excellent corrosion resistance, including in seawater, and holds its properties at elevated temperature up to around 400 degrees Celsius. It is specified for heavy-duty wear parts, marine components, and pump and valve parts handling aggressive media.

Manganese bronze such as Cu-13Mn-8Al-3Fe is a high-strength copper alloy used for shaft sleeves and heavy machinery components that must resist both wear and pressure. A nickel-bearing variant, Cu-13Mn-8Al-3Fe-2Ni, is chosen where high strength has to be combined with corrosion resistance in the same part.

Non-ferrous alloys are selected when the part needs something iron and steel cannot easily provide: aluminium for light weight and thermal conductivity, bronze for bearing performance and seawater corrosion resistance, copper for electrical conductivity, and brass for machinability. They also machine faster, though they generally offer lower strength and stiffness than steel.

Yes. Tin bronzes and aluminium bronzes are among the most reliable materials for seawater exposure, resisting the corrosion and biofouling that attack ferrous parts. Aluminium bronze in particular is specified for marine pumps, valves and propulsion components. Alloy choice should reflect flow velocity and whether the part also carries mechanical load.

Green sand casting handles most general aluminium and bronze work economically across a wide size range. Shell moulding is used where tighter dimensional accuracy and better surface finish are needed, and investment casting suits intricate, thin-walled or near-net-shape parts. Bushes and sleeves are often centrifugally cast for a denser, sounder wall.