This 9.82-lb. brass steering linkage (left) for a pallet truck (right) was converted from a weldment with 10 pre-fabricated pieces, 19 weld joints and four bushings (below).
containing 0.3-6% lead. Leaded tin- bronze offers the additional advantage of free cutting.
High-Leaded Tin Bronze (C93100 to C94500)—This is a tin-bronze containing 2-34% lead. High-leaded tin-bronze is used in sleeve bearings and bushings because the additional lead provides improved lubricity. Nickel-Tin-Bronze (C94700 to C94900)—This is a tin-bronze containing 4-6% nickel. Nickel-tin-bronze is a versatile alloy that has the good wear resistance and corrosion resistance found in tin-bronzes with improved strength. Nickel-tin-bronze is used in bearings, gears, wear guides, pump and valve components, and motion and translation devices, such as shift forks and circuit breaker parts.
Aluminum-Bronze (C95200 to C95900)—Aluminum-bronze has a
These alloys are simple solid solutions
complex metallurgical structure
that imparts both strength and oxidi- zation resistance due to the formation of alumina-rich protective fi lms. These alloys are wear-resistant and exhibit good casting and welding characteristics. Their corrosion resistance is superior in seawa- ter, chloride and dilute acids. Applications are varied and include propellers and valves, pickling hooks, pickling baskets and wear rings. The aluminum bronze alloys that contain nickel are desirable for fl uid-moving applications, such as pump impellers, because of superior erosion, corrosion and cavitation resistance.
Other Alloys Copper-Nickel (C96200 to 96950)—
of nickel in copper without lead. The copper-nickel alloys have excellent corrosion resistance
in seawater, high strength and ease of manufacturing. Their various applications include pumps, valves, ship tail shaft sleeves and other marine applications. Nickel-Silver (C97300 to C97800)—
The presence of nickel accounts for these alloys’ silver luster. These alloys, which do not contain silver, offer good corrosion resistance, ease of castability and good machinability. Despite their high degree of alloying, these alloys are simple solid solutions. Major uses include hardware for food processing, seals, architectural trim and musical instrument valves. Leaded-Coppe r s (C98200 to C98840)—These are essentially pure cop- per or high-copper alloys containing lead. The leaded-coppers offer the moderate corrosion resistance and high conductiv- ity of the copper alloys, in addition to the lubricity and low friction characteristics of high-leaded bronzes. Special Alloys (C99300 to C99750)—
These are alloys with unique characteristics, such as Incrament 800 (C99300), which has high oxidation resistance due to aluminum, good thermal fatigue resistance and high hot hardness. This alloy was developed for glass processing including glassmaking molds and plate glass rolls.
Design for Manufacturing The choice of alloy and casting
method (sand, permanent mold, die or investment casting) determines the mechanical and physical properties, section size, wall thickness and surface finish that can be achieved. Each alloy and casting process combination results in a different set of properties. If metalcasting facility and design
engineers can work together on the “raw” or ideal component, all options will be considered early in the design process, resulting in a design and component that take advantage of the versatility that copper alloys offer.
METAL 36 Metal Casting Design & PurChasing 2010 Casting sourCe DireCtory
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