Page 356 - Content.pmd

Table 3 - Composition of different types of bronze

Composition (%)

Name Copper Zinc Phosphorus Tin Applications

Low tin 96 - 0.1 3.9 This alloy can be severely cold-worked to
harden
bronze to to it so that it can be used for springs where good
0.25 3.75 elastic properties must be combined with corro-
sion resistance,fatigue-resistance and electrical
conductivity. Eg.Contact blades
Drawn 94 - 0.1 5.9 This alloy is used for turned components requiring
phosphor/ to to strength and corrosion resistance, such as valve
bronze 0.5 5.5 spindles.

Cast 89.75 0.03 10 Usually cast into rods and tubes for making bear-
phosphor/ to to ing bushes and worm wheels. It has excellent
bronze 89.97 0.25 anti-friction properties.
Admirality 88 2 - 10 This alloy is suitable for sand casting where fine-
gun-metal grained, pressure-tight components such as pump
and valve bodies are required.

Leaded 85 5 - 5 Also known as ‘red brass’ this alloy is used for the
gun-metal (5%lead) same purposes as standard, admiralty gun-metal.
(free cutting) It is rather less strong but has improved toughness
and machining properties.
Leaded 74 (24%lead) - 2 This alloy is used for lightly loaded bearings where
(plastic) alignment is difficult. Due to its softness, bearings
bronze made from this alloy “bed in” easily.

LôÃVm (Lead) LôÃVm B]Õ ùTôÕYôL G§odÏm JÚ EúXôLm BÏm. G]úY CÕ
A§Lm TVuTÓm JÚ CÚm× NôoTt\ Rôe¡Ls ùNnV A§Lm TVuTÓ¡\Õ.
EúXôLm BÏm. CÕ ùRô¯tNôûXL°p
LôÃVØm, DVØm LXkR LXl× EúXôLm
TpúYß YûLL°p TVu TÓ¡u\]. LXõ]ô
ùUu Tt\ôL BLl TVuTÓjRlTÓ¡\Õ.
G]lTÓm RôÕ®XõÚkÕ Lô¬V EtTj§
ùNnVl TÓ¡\Õ. Lô¬Vm JÚ L]Uô] (Fig 2)
EúXôLm BÏm. AÕ EÚdLlTÓm úTôÕ
ùYs°ûVl úTôu\ ¨\j§p CÚdÏm. AÕ
ùUuûUVô]Õ. RLPôÏm RuûU
ùLôiPÕ. úUÛm A¬l× G§ol×j §\u
A§Lm ùLôiPÕ. CÕ Aàd L§oÅfÑdÏ
JÚ RÓl× EúXôLm BÏm. LkRL AªXm
ûahúWô Ïú[ô¬d AªXm úTôu\ TX
AªXeLÞdÏ G§ol×j RuûU ùLôiPÕ.
CÕ YôL] ªuLXeLs, Tt\ôÑ (solder)
RVô¬l× úTôu\ûYL°Ûm YoQj
RVô¬l× úYûXL°Ûm TVuTÓ¡\Õ. (Fig 1)

LôÃVd LXl× EúXôLm (Lead Alloys)
úTl©h EúXôLm (Babbit metal)
ÕjRSôLm (Zinc): ÕjRSôLm ùTôÕYôL
LôÃVm, DVm, ùNm× Bu¥U² B¡V
G@ûL A¬l©XõÚkÕ TôÕLôdL éfÑ úYûX
EúXôLeL°u LXûY úTl©h EúXôLm
ùNnVl TVuTÓ¡\Õ. G@Ï Yô°Ls ØXôm
BÏm. CÕ ùUuûUVô] úRnUô]jûR
£_õ & Gm: @©hPo (NSQF - Revised 2022) ------ R.T. for Ex. No.1.6.80-82
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