Category Archives: Alloy Steel

AISI / Alloy Steel 8740

Chemical Analysis
C% Carbon
0.38 – 0.43
Mn% Manganese
0.75 – 1.00
P% Phosphorus
0.035 max
S% Sulfur
0.040 max
Si% Silicon
0.20 – 0.35
Ni% Nickel
0.40 – 0.70
Cr% Chromium
0.80 – 1.10
Mo% Molybdenum
0.15 – 0.25

General characteristics of Alloy Steel 8740

Alloy 8740 is a nickel-chromium-molybdenum low-alloy steel with good hardenability and good strength and toughness properties.

Applications

This alloy finds its uses in applications where strength, toughness and wear resistance are of prime importance. It is widely used as high-strength forged fasteners.

Forging

This alloy is forged at a start temperature of around 2200ºF (1205ºC) and could be forged down to approximately 1700ºF(925ºC.) The alloy is best slow cooled after forging, but may also be transferred to a furnace held at a temperature approximating the forging finishing temperature, soaked then air cooled.

Heat treatment

AnnealingFor optimum machinabilty of this alloy, a microstructure consisting of coarse lamellar pearlite to coarse spheroidite is considered to be optimum. Such a structure can be obtained by austenitizing at 1525ºF (830ºC), furnace cooling to 1340ºF (725ºC) then to 1180ºF (640º) at 20ºF/hr. An alternative is an iso-anneal at 1225ºF (660ºC)

Normalizing:1600ºF (870ºC) and air cool.

Hardening:The alloy will be austenitized at around 1525 – 1575ºF (830 – 855ºC) and oil or water quenched depending upon section size and intricacy.

Tempering: to desired hardness, using temperatures based on past experience, following water or oil quench.

Machinability: This grade of alloy is readily machined following suitable heat treatment.

Weldability:This steel may be welded by normal fusion methods, but prior to hardening and tempering. Pre heat and post heat are recommended.

To Send a Request for Quote, please Click Here, or call 1.973.276.5000 or 1.800.600.9290 or fax 1.973.276.5050.

AISI / Alloy Steel 9850

Chemical Analysis
C% Carbon
0.48– 0.53
Mn% Manganese
0.70 – 0.90
P% Phosphorus
0.040 max
S% Sulfur
0.040 max
Si% Silicon
0.20 – 0.35
Ni% Nickel
0.85 – 1.15
Cr% Chromium
0.70 – 0.90
Mo% Molybdenum
0.20 – 0.30

General characteristics of Alloy Steel 9850

This is a nickel-chrome-molybdenum steel with excellent hardenability, strength and toughness.

Applications

This alloy is suited to production of highly stressed forged components of large cross section for aircraft, automotive and general engineering applications, such as propeller shafts, connecting rods, gear shafts, crankshafts and landing gear components, and for heavy forgings such as rotors, shafts and discs. This alloy will attain higher strength levels than alloy 9840, hence it will be used in applications requiring even greater strength than might be obtained from 9840 grade.

Forging

This alloy would be forged between 2100 and 1700ºF (1150 and 925ºC.) Parts should preferably be slow cooled after forging, otherwise transferred to a furnace held at an equalization temperature.

Heat treatment

Annealing: Austenitize at 1525ºF (830ºC) and slow cool from 1290 to 1200ºF (iso anneal) to give coarse pearlite structure for optimum machinability.

Normalizing: At 1600ºF (870ºC) followed by air cool.

Hardening: from 1500-1550ºF (815-840ºC) and oil quench for thin, intricate shapes, water quench for large, simple shapes.

Tempering: from 1000-1250ºF(540-680ºC) as per required properties.

Machinability:: this alloy may be readily machined, preferably from a coarse pearlitic structure.

Weldability:: pre-heat and post-weld stress relief are recommended for welding of this alloy. Welding should not be carried out in the hardened and tempered condition.

To Send a Request for Quote, please Click Here, or call 1.973.276.5000 or 1.800.600.9290 or fax 1.973.276.5050.

Alloy Steel 9840

Chemical Analysis
C% Carbon
0.38 – 0.43
Mn% Manganese
0.70 – 0.90 max
P% Phosphorus
0.040 max
S% Sulfur
0.040 max
Si% Silicon
0.20 – 0.35
Ni% Chromium
0.85 – 1.15

General characteristics of Alloy Steel 9840

This is a nickel-chrome-molybdenum steel with excellent hardenability, strength and toughness.

Applications

This alloy is suited to production of highly stressed components of large cross section for aircraft, automotive and general engineering applications, such as forged propeller shafts, connecting rods, gear shafts, crankshafts and landing gear components.

Forging

This alloy would be forged between 2150 and 1700ºF (1175 and 925ºC.)

Heat treatment

Annealing: Austenitize at 1525ºF (830ºC) and slow cool from 1280 to 1200ºF (iso anneal) to give coarse pearlite structure for optimum machinability.

Normalizing: At 1600ºF (870ºC) followed by air cool.

Hardening: from 1525-1575ºF (830-860ºC) and oil quench for thin, intricate shapes, water quench for large, simple shapes.

Tempering: from 1000-1250ºF(540-680ºC) as per required properties.

Machinability: this alloy may be readily machined, preferably from a coarse pearlitic structure.

Weldability: pre-heat and post-weld stress relief are recommended for welding of this alloy. Welding should not be carried out in the hardened and tempered condition.

To Send a Request for Quote, please Click Here, or call 1.973.276.5000 or 1.800.600.9290 or fax 1.973.276.5050.

AISI / Alloy Steel 9260

Chemical Analysis
C% Carbon
0.56 – 0.64
Mn% Manganese
0.75 – 1.00
P% Phosphorus
0.035 max
S% Sulfur
0.040 max
Si% Silicon
1.8 – 2.2

General characteristics of Alloy Steel 9260

Alloy steel 9260 is a high-silicon grade especially designed for its spring properties.

Applications

Leaf and truncated conical springs for automotive and general engineering

Forging

A recommendation for general applications is 1925 – 1560ºF (1050-850ºC) and for springs 1650 – 1560ºF (900 – 850ºC.) Parts should be slow cooled after forging or transferred to an equalization treatment.

Heat treatment

Annealing: To produce a structure of coarse to fine spheroidite, parts should be austenitized at 1400ºF (760ºC) and cooled to 1300ºF (705º) at a rate of 10ºF/hr., or alternately cooled to 1225ºF (660ºC) and held for 10 hours as an iso-anneal.

Normalizing: 1650ºF (900ºC) and air cool. This will be an important treatment for this grade.

Hardening: Austenitize at 1525-1580ºF (830-860ºC) and water quench.

Tempering: 880-970ºF (470-520ºC)

Machinability: Parts could be machined following a spheroidize anneal

Weldability: The grade would not normally be welded.

To Send a Request for Quote, please Click Here, or call 1.973.276.5000 or 1.800.600.9290 or fax 1.973.276.5050.

AISI / Alloy Steel 8750

Chemical Analysis
C% Carbon
0.48 – 0.53
Mn% Manganese
0.75 – 1.00
P% Phosphorus
0.040 max
S% Sulfur
0.040 max
Si% Silicon
0.20 – 0.35
Ni% Nickel
0.40 – 0.70
Cr% Chromium
0.40 – 0.60
Mo% Molybdenum
0.20 – 0.30

General characteristics of Alloy Steel 8750

Alloy steel 8750 is a low-alloy steel containing nickel, chromium and molybdenum as alloying elements. The alloy has excellent hardenability, and good strength and toughness properties.

Applications

This alloy finds its uses in applications where excellent strength, toughness and wear resistance are of prime importance, and is widely used for high-strength, forged fasteners

Forging

This alloy is forged at a start temperature of around 2150ºF (1175ºC) and could be forged down to approximately 1700ºF(925ºC.) The alloy is best slow cooled after forging, but may also be transferred to a furnace held at a temperature approximating the forging finishing temperature, soaked then air cooled.

Heat treatment

Annealing: For optimum machinabilty of this alloy, a microstructure consisting of coarse lamellar pearlite to coarse spheroidite is considered to be optimum. Such a structure can be obtained by austenitizing at 1525ºF (830ºC), furnace cooling to 1310ºF (710ºC) then to 1200ºF (640º) at 20ºF/hr. An alternative is an iso-anneal at 1225ºF (650ºC)

Normalizing: 1600ºF (870ºC) and air cool.

Hardening: The alloy will be austenitized at around 1500 – 1575ºF (815 – 855ºC) and oil or water quenched depending upon section size and intricacy.

Tempering: to desired hardness, using temperatures based on past experience, following water or oil quench.

Machinability: This grade of alloy is readily machined following suitable heat treatment.

Weldability: This steel may be welded by normal fusion methods, but prior to hardening and tempering. Pre heat and post heat are recommended.

To Send a Request for Quote, please Click Here, or call 1.973.276.5000 or 1.800.600.9290 or fax 1.973.276.5050.

Alloy Steel AISI 8740

General Characteristics of Alloy Steel AISI 8740

Alloy 8740 is a nickel-chromium-molybdenum low-alloy steel with good hardenability and good strength and toughness properties.

Chemical Analysis

C% Mn% P% S% Si% Ni% Cr% Mo%
0.38/0.43 0.75/1.00 0.040 max 0.040 max 0.20/0.35 0.40/0.70 0.40/0.60 0.20/0.30

Applications
This alloy finds its uses in applications where strength, toughness and wear resistance are of prime importance. It is widely used as high-strength forged fasteners.
Forging
This alloy is forged at a start temperature of around 2200ºF (1205ºC) and could be forged down to approximately 1700ºF(925ºC.) The alloy is best slow cooled after forging, but may also be transferred to a furnace held at a temperature approximating the forging finishing temperature, soaked then air cooled.

Heat Treatment
Annealing: For optimum machinabilty of this alloy, a microstructure consisting of coarse lamellar pearlite to coarse spheroidite is considered to be optimum. Such a structure can be obtained by austenitizing at 1525ºF (830ºC), furnace cooling to 1340ºF (725ºC) then to 1180ºF (640º) at 20ºF/hr. An alternative is an iso-anneal at 1225ºF (660ºC)
Normalizing: 1600ºF (870ºC) and air cool.

 Hardening: The alloy will be austenitized at around 1525 – 1575ºF (830 – 855ºC) and oil or water quenched depending upon section size and intricacy.
Tempering: to desired hardness, using temperatures based on past experience, following water or oil quench.
Machinability: This grade of alloy is readily machined following suitable heat treatment.

Weldability: This steel may be welded by normal fusion methods, but prior to hardening and tempering. Pre heat and post heat are recommended.

AISI / Alloy Steel 8735

Chemical Analysis
C% Carbon
0.33 – 0.38
Mn% Manganese
0.75 – 1.00
P% Phosphorus
0.040 max
S% Sulfur
0.040 max
Si% Silicon
0.20 – 0.35
Ni% Nickel
0.40 – 0.70
Cr% Chromium
0.40 – 0.60
Mo% Molybdenum
0.20 – 0.30

General characteristics of Alloy Steel 8735

Alloy steel 8735 is a low-alloy steel containing nickel, chromium and molybdenum as alloying elements. The alloy has good hardenability, and good strength and toughness properties.

Applications

This alloy finds its uses in applications where strength, toughness and wear resistance are of prime importance. It is widely used as high-strength forged fasteners.

Forging

This alloy is forged at a start temperature of around 2200ºF (1205ºC) and could be forged down to approximately 1700ºF(925ºC.) The alloy is best slow cooled after forging, but may also be transferred to a furnace held at a temperature approximating the forging finishing temperature, soaked then air cooled.

Heat treatment

Annealing: For optimum machinabilty of this alloy, a microstructure consisting of coarse lamellar pearlite with minimum ferrite is considered to be optimum. Such a structure can be obtained by austenitizing at 1525ºF (830ºC), furnace cooling to 1340ºF (725ºC) then to 1180ºF (640º) at 20ºF/hr. An alternative is an iso-anneal at 1225ºF (660ºC)

Normalizing: 1600ºF (870ºC) and air cool.

Hardening:The alloy will be austenitized at around 1525 – 1575ºF (830 – 855ºC) and oil or water quenched depending upon section size and intricacy.

Tempering: to desired hardness, using temperatures based on past experience, following water or oil quench.

Machinability: This grade of alloy is readily machined following suitable heat treatment.

Weldability:This steel may be welded by normal fusion methods, but prior to hardening and tempering. Pre heat and post heat are recommended.

To Send a Request for Quote, please Click Here, or call 1.973.276.5000 or 1.800.600.9290 or fax 1.973.276.5050.

AISI / Alloy Steel 8720

Chemical Analysis
C% Carbon
0.18 – 0.23
Mn% Manganese
0.70 – 0.90
P% Phosphorus
0.035 max
S% Sulfur
0.040 max
Si% Silicon
0.20 – 0.35
Ni% Nickel
0.40 – 0.70
Cr% Chromium
0.40 – 0.60
Mo% Molybdenum
0.20 – 0.30

General characteristics of Alloy Steel 8720

Alloy steel 8720 is a case-hardening low-alloy steel containing nickel, chromium and molybdenum as alloying elements.

Applications

This alloy may be used in the production of medium-strength parts such as forged camshafts, fasteners and gears.

Forging

This alloy is forged at a start temperature of around 2250ºF (1230ºC) and could be forged down to approximately 1700ºF(925ºC.) The alloy is air cooled after forging.

Heat treatment

Annealing: For optimum machinabilty, an as-forged structure is normally sufficient for this grade of alloy steel. If this proves not to be the case then an iso-anneal from around 1650ºF (900ºC) to 1225ºF (660ºC) will improve machinability.

Normalizing: 1700ºF (925ºC) and air cool. This is another method of improving machinability in this grade; normalizing might also be used prior to case hardening.

Hardening: The alloy will be austenitized at around 1550ºF (840ºC) and oil or water quenched depending upon section size and intricacy.

Tempering : to desired hardness, using temperatures based on past experience, following water or oil quench.

Machinability:This grade of alloy is readily machined following suitable heat treatment.

Weldability: This steel may be welded by normal fusion methods, but prior to any heat treatment that will modify the steel’s properties.

To Send a Request for Quote, please Click Here, or call 1.973.276.5000 or 1.800.600.9290 or fax 1.973.276.5050.

AISI / Alloy Steel 8645

Chemical Analysis
C% Carbon
0.43 – 0.48
Mn% Manganese
0.75 – 1.00
P% Phosphorus
0.040 max
S% Sulfur
0.040 max
Si% Silicon
0.20 – 0.35
Ni% Nickel
0.40 – 0.70
Cr% Chromium
0.40 – 0.60
Mo% Molybdenum
0.15 – 0.25

General characteristics of Alloy Steel 8645

Alloy steel 8645 is a low-alloy steel containing nickel, chromium and molybdenum as alloying elements. The alloy has good hardenability, and good strength and toughness properties.

Applications

This alloy finds its uses in applications where good strength, toughness and wear resistance are of prime importance. The alloy finds applications as forged parts where such properties come into play, as in the automotive and aeronautic industries.

Forging

This alloy is forged at a start temperature of around 2200ºF (1205ºC) and could be forged down to approximately 1700ºF(925ºC.) The alloy is best slow cooled after forging, but may also be transferred to a furnace held at a temperature approximating the forging finishing temperature, soaked then air cooled.

Heat treatment

Annealing: For optimum machinabilty of this alloy, a microstructure consisting of coarse lamellar pearlite to coarse spheroidite is considered to be optimum. Such a structure can be obtained by austenitizing at 1525ºF (830ºC), furnace cooling to 1310ºF (710ºC) then to 1200ºF (640º) at 20ºF/hr. An alternative is an iso-anneal at 1225ºF (650ºC)

Normalizing: 1600ºF (870ºC) and air cool.

Hardening: The alloy will be austenitized at around 1500 – 1575ºF (815 – 855ºC) and oil or water quenched depending upon section size and intricacy.

Tempering: to desired hardness, using temperatures based on past experience, following water or oil quench.

Machinability: This grade of alloy is readily machined following suitable heat treatment.

Weldability:This steel may be welded by normal fusion methods, but prior to hardening and tempering. Pre heat and post heat are recommended.

To Send a Request for Quote, please Click Here, or call 1.973.276.5000 or 1.800.600.9290 or fax 1.973.276.5050.

AISI / Alloy Steel 8642

Chemical Analysis
C% Carbon
0.40 – 0.45
Mn% Manganese
0.75 – 1.00
P% Phosphorus
0.040 max
S% Sulfur
0.040 max
Si% Silicon
0.20 – 0.35
Ni% Nickel
0.40 – 0.70
Cr% Chromium
0.40 – 0.60
Mo% Molybdenum
0.15 – 0.25

General characteristics of Alloy Steel 8642

Alloy steel 8642 is a low-alloy steel containing nickel, chromium and molybdenum as alloying elements. The alloy has good hardenability, and good strength and toughness properties.

Applications

This alloy finds its uses in forging applications where good strength, toughness and wear resistance are of prime importance. It might be used as a substitute for 8640 grade in the production of forged fasteners.

Forging

This alloy is forged at a start temperature of around 2200ºF (1205ºC) and could be forged down to approximately 1700ºF(925ºC.) The alloy is best slow cooled after forging, but may also be transferred to a furnace held at a temperature approximating the forging finishing temperature, soaked then air cooled.

Heat treatment

Annealing: For optimum machinabilty of this alloy, a microstructure consisting of coarse lamellar pearlite to coarse spheroidite is considered to be optimum. Such a structure can be obtained by austenitizing at 1525ºF (830ºC), furnace cooling to 1310ºF (710ºC) then to 1200ºF (640º) at 20ºF/hr. An alternative is an iso-anneal at 1225ºF (650ºC)

Normalizing: 1600ºF (870ºC) and air cool.

Hardening: The alloy will be austenitized at around 1500 – 1575ºF (815 – 855ºC) and oil or water quenched depending upon section size and intricacy.

Tempering: to desired hardness, using temperatures based on past experience, following water or oil quench.

Machinability: This grade of alloy is readily machined following suitable heat treatment.

Weldability: This steel may be welded by normal fusion methods, but prior to hardening and tempering. Pre heat and post heat are recommended.

To Send a Request for Quote, please Click Here, or call 1.973.276.5000 or 1.800.600.9290 or fax 1.973.276.5050.