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Introduction
ASTM A668
/ A668M covers untreated and heat-treated carbon and alloy steel forgings for
general industrial applications. The specification includes a wide range of
forging grades that provide excellent mechanical strength, toughness, fatigue
resistance, machinability, and structural integrity for critical engineering
components.
ASTM A668
alloy steel forgings are manufactured using open-die and closed-die forging
processes to produce high-quality components for power generation, oil and gas,
petrochemical, marine, mining, cement, steel, and heavy engineering industries.
These forgings offer superior grain refinement, enhanced mechanical properties,
and excellent performance under dynamic and static loading conditions.
The
specification provides multiple grades to satisfy varying strength and
toughness requirements, making ASTM A668 forgings suitable for shafts, rings,
gears, flanges, discs, hubs, sleeves, rollers, couplings, and other heavy-duty
industrial components.
Ladhani
Metal Corporation is a manufacturer, supplier, and exporter of ASTM A668 /
A668M Alloy Steel Forgings, supplying premium-quality forged components for
industrial, power generation, heavy engineering, and process industry
applications worldwide.
Applicable Standard
Standard
Specification: ASTM A668 / A668M
Organization:
ASTM International
Title:
Standard Specification for Steel Forgings, Carbon and Alloy, for General
Industrial Use
This
specification covers untreated and heat-treated carbon and alloy steel forgings
intended for general industrial applications requiring dependable mechanical
properties and structural reliability.
Forms of Supply
ASTM A668
steel forgings are supplied in the following forms:
• Forged
shafts
• Forged rings
• Forged discs
• Forged blocks
• Forged billets
• Forged sleeves
• Forged hubs
• Forged rollers
• Forged flanges
• Forged gears
• Forged couplings
• Open-die forgings
• Closed-die forgings
• Custom machined forgings
Grades Covered Under
ASTM A668 / A668M
• Grade A
• Grade B
• Grade C
• Grade D
• Grade E
• Grade F
• Grade G (GH)
• Grade H (HH)
• Grade J (JH)
• Grade K (KH)
• Grade L (LH)
• Grade M (MH)
• Grade N (NH)
Supply Condition
• As
forged
• Annealed
• Normalized
• Quenched and tempered
• Stress relieved
• Rough machined
• Fully machined (when specified)
Surface Finish
• As
forged finish
• Rough machined finish
• Machined finish
• Ground finish
• Shot blasted finish
• Finished machined surface
Standard Sizes
Forgings
Outside
Diameter: Up to 5000 mm
Length:
As per customer requirements
Weight:
Up to 100 MT
Forgings
are available according to customer drawings, dimensions, machining allowances,
and technical specifications.
Chemical Composition
of ASTM A668 / A668M
|
Elements |
Classes A to F and AH to FH (Max.
%) |
Classes G to N and GH to NH (Max.
%) |
|
Manganese |
1.35 |
— |
|
Phosphorus |
0.050 |
0.040 |
|
Sulfur |
0.050 |
0.040 |
Key Features of ASTM
A668 / A668M Forgings
• High
mechanical strength
• Excellent toughness and ductility
• Superior fatigue resistance
• Excellent machinability
• Outstanding structural integrity
• Uniform grain structure
• Excellent heat treatment response
• Reliable dimensional stability
• Suitable for heavy-duty industrial service
• Long operational life
Applications of ASTM
A668 / A668M Forgings
Power Generation Industry
• Turbine
shafts
• Generator rotors
• Steam turbine components
• Power transmission equipment
Oil and Gas Industry
• Valve
bodies
• Pressure equipment components
• Pump shafts
• Drilling equipment
Petrochemical Industry
• Reactor
components
• Process equipment
• Compressor shafts
• Heavy machinery parts
Mining Industry
• Crusher
shafts
• Mill rollers
• Gear blanks
• Heavy mining equipment
Marine Industry
• Marine
shafts
• Propeller shafts
• Marine couplings
• Offshore engineering components
Heavy Engineering Industry
• Forged
rings
• Hydraulic cylinders
• Crane components
• Industrial machine parts
Fabrication and
Machining
ASTM A668
alloy steel forgings provide excellent machining and manufacturing characteristics.
•
Excellent machinability
• Suitable for precision machining operations
• Good drilling and milling characteristics
• Excellent dimensional accuracy after machining
• Suitable for heavy-duty engineering applications
• Compatible with conventional manufacturing processes
Proper
machining and heat treatment procedures should be followed to obtain optimum
mechanical performance.
Heat Treatment
ASTM A668
forgings may be supplied in different heat-treated conditions according to the
specified grade and application.
•
Annealing improves machinability
• Normalizing refines grain structure
• Quenching increases hardness and strength
• Tempering improves toughness and ductility
• Stress relieving minimizes residual stresses after machining
Controlled
heat treatment ensures consistent mechanical properties and reliable service
performance.
Advantages of ASTM
A668 / A668M Forgings
•
Excellent load-bearing capability
• Superior mechanical strength
• Outstanding fatigue performance
• Excellent impact resistance
• High structural reliability
• Excellent machining characteristics
• Long service life
• Suitable for critical engineering applications
• Consistent material quality
• Cost-effective forged component solution
Conclusion
ASTM A668
/ A668M Alloy Steel Forgings are manufactured to provide superior strength,
toughness, fatigue resistance, and dimensional reliability for demanding industrial
applications. Available in Grades A, B, C, D, E, F, G (GH), H (HH), J (JH), K
(KH), L (LH), M (MH), and N (NH), these forgings are widely used in power
generation, oil and gas, petrochemical, mining, marine, and heavy engineering
industries for the production of shafts, rings, flanges, gears, rollers, hubs,
and other critical forged components.
Ladhani Metal Corporation
supplies ASTM A668 / A668M alloy steel forgings in various grades, sizes,
heat-treated conditions, and customized specifications, providing dependable
forging solutions for industrial, engineering, and power generation projects
worldwide.
FOR REQUIREMENT OF THIS GRADE
OR FOR DETAIL CONTACT US AT :-
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, H (HH), J (JH), K (KH), L (LH), M (MH) & N (NH)] – Detailed overview){kind=link}