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General
Linear Tolerances
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BS
3146 Part I, 1974
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Grade
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Material
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Characteristics
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Typical
Applications
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CLA.1
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A
B C |
Carbon
Steels
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Plain
carbon steels offering a range of tensile properties (via heat-treatment)
with good ductility.
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Engineering
steels for low and medium strength applications, e.g. brackets,
housings, links.
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CLA.2
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1½% Manganese steel | Superior properties to plain carbon steels having a high yield strength, good ductility and toughness. | Medium strength applications where a degree of shock resistance is required, e.g. links, levers. | |
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CLA.3
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700 N/mm² to 850N/mm² alloy steel | A range of tensile strengths are possible with good ductility and shock resistance; readily machinable in the softened condition. | Alloy steels for medium to high strength applications, where ductility and good shock and fatigue strengths are required, e.g. brackets, levers, air-frame parts, hydraulic machinery. | |
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CLA.4
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850 N/mm² to 1000N/mm² alloy steel | |||
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CLA.5
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A
B |
High Tensile Steel | ||
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CLA.7
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3% Cr Mo Steel | A combination of properties with medium tensile strength, good ductility and resistance to thermal shock. Useful corrosion and creep resistant properties. | Structural parts and parts operating at temperatures up to 400°C. | |
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CLA.8
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Carbon steel for surface hardening | A capability to local or surface harden to a minimum of 500 HV but retaining a good core strength. | Low to medium strength components requiring a high local surface hardness, e.g. pawls, ratchets, triggers. | |
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CLA.9
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Carbon steel for case hardening | A low-carbon case hardening steel for carburising or cyanide treatment, giving a low tensile trength core hence a good shock resistance. | Components requiring good shock resistance with high surface hardness, e.g. ratchets and operating levers. | |
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CLA.10
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3% Ni case hardening steel | A case hardening steel for carburising or cyanide treatment, having a dense tough core with reasonable shock resistance. | Parts subject to reciprocating or intermittent loading, e.g. high speed connecting links and levers. | |
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CLA.11
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3% Cr Mo nitriding steel | A 3% Cr-Mo steel for surface hardening by nitriding to 900 HV but retaining a high strength core with good ductibility and shock resistance. | Moving parts where abrasion or wear resistance are required, e.g. crank pins, crank-shafts, sewing machine loopers, etc. | |
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CLA.12
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A
B C |
1%
Cr abrasion resisting steel
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A
steel with capability of good through hardness and abrasion resistance.
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Hardened
parts subject to wear and abrasion. Grades B and C are suitable
for heavy duty conditions.
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CLA.13
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Ni Mo case hardening steel | A case carburising steel, but with a medium strength core and reasonable shock resistance. An alternative material to CLA.10 | Parts subject to reciprocating or intermittent loading, e.g. high speed connecting links and levers. |
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Corrosion
and Heat Resistant Steels
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BS
3146 Part II, 1975
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Grade
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Material
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Characteristics
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Typical
Applications
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ANC
1
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A
B C |
13%
Cr Martensitic steels
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A
general engineering type stainless steel, offering a range of strengths
and hardnesses. Medium corrosion resistance.
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A.
Gas chemical and petroleum industries; high ductility engineering
fittings, golf club heads.
B. Heat resistant parts not subject to high stresses. C. Cutting blades, pump and steam turbine parts. |
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ANC
2
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18% Cr 2% Ni Martensitic steels | A high tensile stainless steel with improved corrosion resistant properties. Resistant to oxidising atmospheres up to 760°C. | Pump and valve parts; highly stressed aircraft and general engineering fittings. | |
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ANC
3
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A
B |
18%
Cr 10% Ni Austenitic steels
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A. corrosion and acid restraint stainless steel; excellent stability down to - 225°C. B. Weldable version of the above, usable up to 800°C. |
A.
Chemical, pharmaceutical, textile, dairy and oil industries, e.g.
pump and valve parts.
B. Exhaust systems and marine fittings to a certain extent. Corrosion/acid resistant parts not heat-treated after welding. |
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ANC
4
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A
B C |
18%
Cr 11% Ni 3% Mo Austenitic steels
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Stainless
steels with good corrosion and acid resistance, with medium tensile
strength.
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In
the chemical and processing industries, e.g. valves and pumps handling
acids at high temperatures and also chlorides and salts.
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ANC
5
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A
B C |
Ni-Cr steels |
Heat
resistant alloys with resistance to cyclic heating and useful creep
strength up to 650°C and good resistance to scaling.
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Furnace
parts, salt and lead baths.
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ANC
6
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A
B C |
Cr-Ni steels |
Heat
resistant alloys with good strength to 900°C and useful creep
strength to 650°C.
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Heat
treatment parts and superheaters, welding fixtures. High temperature
castings. Nozzle guide vanes for gas turbines.
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ANC
8
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Ni-base 20% Cr; 0.4% Ti alloy |
A
readily weldable heat-resistant alloy with excellent resistance
to oxidisation up to 1100°C and with useful strength.
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Furnace
parts.
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ANC
9
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Ni-base 20% Cr; 2.5% Ti, 1.2% Al alloy |
A
heat-resistant alloy with good creep and oxidisation resistance
up to 870°C.
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Diesel
engine pre-combustion chambers, gas turbine parts.
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ANC
10
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Ni-base 20% Cr 16.5% Co, 2.4% Ti, 1.3% Al alloy |
Increased
strength over the ANC 9 alloy with good creep and oxidisation resistance
up to 870°C.
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Turbine
and turbocharger rotors.
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ANC
11
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Ni-base 20% Cr 10% Co, 10% Mo alloy |
Medium
strength alloy with excellent resistance to oxidisation and thermal
fatigue at temperatures over 1000°C, good thermal shock resistance
up to 1100°C.
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Gas
turbine and stator blades.
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ANC
13
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Co-base 26% Cr 10% Ni, 7% W alloy |
A
high strength heat-resistant alloy. Resistant to oxidisation at
high temperatures, corrosion, galling and wear. Good resistance
to creep and thermal shock.
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Impellers,
hot metal dies and valve components.
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ANC
14
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Ni-base 27% Cr 5.5% Mo, 2.7% Ni alloy |
A
high strength heat-resistant alloy. Resistant to oxidisation at
high temperatures and corrosion resistant. Resistant to wear and
with good low temperature impact properties.
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Impellers,
gas turbine components and valve components for high temperature
service.
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ANC
15
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Ni-base 28% Mo alloy |
A
corrosion and heat-resistant alloy. Good resistance to sulphuric
and phosphoric acids; excellent resistance to concentrated, hot
hydrochloric acid and acid chlorides. Useful creep strength up to
800°C.
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Chemical
and petroleum plant components and pickling equipment.
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ANC
16
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Ni-base 17% Mo 16.5% Cr, 4.5% W alloy |
A
corrosion and heat-resistant alloy. Resistant to oxidising acids
(e.g. nitric) at high temperatures. Useful creep strength up to
800°C.
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Chemical
and petroleum plant components.
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ANC
17
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Ni-base 9% Si 3% Cu alloy. |
A
corrosion resistant alloy, particularly against hot sulphuric acid.
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Chemical
and petroleum plant components.
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ANC
18
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A
B C |
Ni-base 31% Cu Si alloy |
Corrosion
resistant alloys with a range of hardness for general engineering
purposes. Resistant to superheated steam, sea-water, mineral acids.
Retention of strength and toughness up to 450°C.
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Power
plant, marine equipment, chemical and process industry components.
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ANC
19
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Ni-base 20% Cr, 7%Nb, 6% Mo, 3% Fe, 3% W alloy |
A
high strength precipitation hardening alloy resistant to thermal
shock and oxidation.
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Diesel
engine combustion chamber inserts.
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ANC
20
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A
B |
14% Cr, 5% Ni, 2% Cu, 1% Mo steels |
A
high strength precipitation hardening steel with good corrosion
resistance and good weldability.
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Marine
applications where high high strenth and good corrosion resistance
are required.
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ANC
21
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26% Cr, 5% Ni, 3% Cu, 2% Mo steel |
Good
corrosion resistance; comparable to ANC 3 with higher strength.
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Marine
applications.
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Copper
Based Alloys
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BS
1400
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Materials
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Characteristics
and Applications
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BS
1400
LG2 |
Leaded
Gunmetal 85/5/5/5
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Moderate
strength good corrosion resistance to sea water. Pump bodies, cocks,
bearings and gears with low loads and adequate lubrication.
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BS
1400
PB1 PB2 |
Phosphor
Bronze
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Resistant
to sea water, dilute acids and boiler feed water. Good bearing alloy
for high loads with good lubrication.
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BS
1400
AB1 AB2 |
Aluminium
Bronze
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Tough,
high strength material, resistant to corrosion from sea water and
acids. Difficult alloy to cast due to dross and narrow freezing
range.
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BS
1400
SCB 3 |
Brass
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General
purpose engineering material with good machinability. Not suited
to sea water or boiler feed water applications.
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BS
1400
HTB 1 |
High
Tensile Brass
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Strong
alloy resistant to sea water corrosion. Used for ships' propellers.
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Tool
Steels
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Type
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Nearest
Comparable Specification
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Type
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Nearest
Comparable Specification
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BS
4659 Tool Steel
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A.I.S.I.
Tool Steel
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BS
4659 Tool Steel
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A.I.S.I.
Tool Steel
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1%
C-Chrome
C-V Spring Steel 18% Cr-1% C Cutlery Carbon-2% W 3% W-Cr-V 1% C-Cr-W |
BL3
BW2 - - BF1 BS1 - |
L1
W2(1090) (440c) (440a) F1 - F2 S1 - |
12%
Cr-Mo-V
18-4-1 H.S.S 18-4-2 H.S.S. 12% Cr wear/ Die 5% Cr-Mo-V Mn-C-Cr-W Mn-C-Cr |
BD1
BT1 BT2 BD3 BH13 B01 B02 |
D2
T1 T2 D3 H13 01 02 |
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Aluminium
Alloys
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Type
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Specification
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Characteristics
and Applications
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Al/Si/Mg
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BS
2L99
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High
strength, good corrosion resistance alloy. Excellent castability
for premium grade castings.
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Al/Si/Mg
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BS
1490
LM25 |
Useful
general purpose alloy with a range of mechanical properties achieved
by variations in heat treatment. Good corrosion resistance and pressure
tight properties. Excellent castability.
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Al/Si/Mg
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DTD
716
DTD 722 DTD 727 DTD 735 |
Useful
general purpose alloy with a range of mechanical properties achieved
by variations in heat treatment. Good castability.
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Al/Si/Mg
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356
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Useful
general purpose alloy with good strength and corrosion resistance.
Good castability.
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Al/Cu/Si
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BSL
154
L155 |
High
strength but difficult to cast. For premium grade castings L99 should
be considered as alternative.
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