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Introduction
ASTM A668 /
A668M covers carbon and alloy steel forgings intended for general industrial
use, including pressure vessels, shafts, rotors, and other heavy-duty
components. These forgings are designed to deliver high strength, toughness,
and reliability under demanding service conditions.
ASTM A668
forged steel components are widely used in industries where mechanical
performance, structural integrity, and resistance to stress are critical.
Ladhani
Metal Corporation is a manufacturer, supplier, and exporter of ASTM A668 /
A668M forged steel components, supplying high-quality forgings for heavy
engineering and industrial applications.
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 carbon and alloy steel forgings for use in general
engineering and industrial applications.
Forms of Supply
ASTM A668
forged steel components are supplied in the following forms:
Forged
shafts
Forged bars
Forged rings
Forged discs
Custom-shaped forgings
Supply
Condition
As-forged
condition
Normalized condition
Quenched and tempered condition
Surface
Finish
Black
surface
Rough machined
Shot blasted
Machined finish (if required)
Standard
Sizes
Diameter: Up
to 2000 mm
Length: Up to 12000 mm
Weight: As per requirement
(Custom
sizes available as per drawings and specifications)
Classes
Covered Under ASTM A668 / A668M
Class A
Class B
Class C
Class D
Class F
These
classes differ in mechanical properties and heat treatment conditions, allowing
selection based on application requirements.
Chemical Composition of ASTM A668 Forged Steel (%)
|
Element |
Classes A to F and |
Classes G to N and |
|
Manganese |
1.35 |
— |
|
Phosphorus |
0.050 |
0.040 |
|
Sulfur |
0.050 |
0.040 |
Carbon Steel
|
Class |
Over
(in. [mm]) |
Not
Over (in. [mm]) |
Tensile
Strength (psi) |
MPa |
Yield
Strength (psi) |
MPa |
Elongation
(%) |
Reduction
of Area (%) |
Brinell
Hardness |
|
A (AH) (Untreated) |
— |
20 [500] |
47,000 |
325 |
— |
— |
— |
— |
183 max |
|
B (BH) (Annealed / Normalized / N&T) |
— |
20 [508] |
60,000 |
415 |
30,000 |
205 |
24 |
36 |
120–174 |
|
C (CH) (Annealed / Normalized / N&T) |
— |
12 [203] |
66,000 |
455 |
33,000 |
230 |
23 |
36 |
137–183 |
|
C (CH) |
12 [305] |
20 [508] |
66,000 |
455 |
33,000 |
230 |
22 |
34 |
137–183 |
|
D (DH) (Normalized / Annealed / N&T) |
— |
8 [203] |
75,000 |
515 |
37,500 |
260 |
24 |
40 |
149–207 |
|
D (DH) |
8 [203] |
12 [305] |
75,000 |
515 |
37,500 |
260 |
22 |
35 |
149–207 |
|
D (DH) |
12 [305] |
20 [508] |
75,000 |
515 |
37,500 |
260 |
20 |
32 |
149–207 |
|
D (DH) |
20 [508] |
— |
75,000 |
515 |
37,500 |
260 |
19 |
30 |
149–207 |
|
E (EH) (Normalized & Tempered / Double
N&T) |
— |
8 [203] |
85,000 |
585 |
44,000 |
305 |
25 |
40 |
174–217 |
|
E (EH) |
8 [203] |
12 [305] |
83,000 |
570 |
43,000 |
295 |
23 |
37 |
174–217 |
|
E (EH) |
12 [305] |
20 [508] |
83,000 |
570 |
43,000 |
295 |
22 |
35 |
174–217 |
|
F (FH) (Quenched & Tempered /
N+Q&T) |
— |
4 [102] |
90,000 |
620 |
55,000 |
380 |
20 |
39 |
187–235 |
|
F (FH) |
4 [102] |
7 [178] |
85,000 |
585 |
50,000 |
345 |
20 |
39 |
174–217 |
|
F (FH) |
7 [178] |
10 [254] |
85,000 |
585 |
50,000 |
345 |
19 |
37 |
174–217 |
|
F (FH) |
10 [254] |
20 [508] |
82,000 |
565 |
48,000 |
330 |
19 |
36 |
174–217 |
Alloy Steel
|
Class |
Over
(in. [mm]) |
Not
Over (in. [mm]) |
Tensile
Strength (psi) |
MPa |
Yield
Strength (psi) |
MPa |
Elongation
(%) |
Reduction
of Area (%) |
Brinell
Hardness |
|
G (GH) (Annealed / Normalized / N&T) |
— |
12 [305] |
80,000 |
550 |
50,000 |
345 |
24 |
40 |
163–207 |
|
G (GH) |
12 [305] |
20 [508] |
80,000 |
550 |
50,000 |
345 |
22 |
38 |
163–207 |
|
H (HH) (Normalized & Tempered) |
— |
7 [178] |
90,000 |
620 |
60,000 |
415 |
22 |
44 |
187–235 |
|
H (HH) |
7 [178] |
10 [254] |
90,000 |
620 |
58,000 |
400 |
21 |
42 |
187–235 |
|
H (HH) |
10 [254] |
20 [508] |
90,000 |
620 |
58,000 |
400 |
18 |
40 |
187–235 |
|
J (JH) (N&T / Q&T) |
— |
7 [178] |
95,000 |
655 |
70,000 |
485 |
20 |
50 |
197–255 |
|
J (JH) |
7 [178] |
10 [254] |
90,000 |
620 |
65,000 |
450 |
20 |
50 |
187–235 |
|
J (JH) |
10 [254] |
20 [508] |
90,000 |
620 |
65,000 |
450 |
18 |
48 |
207–255 |
|
K (KH) (N+Q&T) |
— |
7 [178] |
105,000 |
725 |
80,000 |
550 |
20 |
50 |
212–269 |
|
K (KH) |
7 [178] |
10 [254] |
100,000 |
690 |
75,000 |
515 |
19 |
50 |
207–269 |
|
K (KH) |
10 [254] |
20 [508] |
100,000 |
690 |
75,000 |
515 |
18 |
48 |
207–269 |
|
L (LH) (N+Q&T) |
— |
4 [102] |
125,000 |
860 |
105,000 |
725 |
16 |
50 |
255–321 |
|
L (LH) |
4 [102] |
7 [178] |
115,000 |
795 |
95,000 |
655 |
16 |
45 |
235–302 |
|
L (LH) |
7 [178] |
10 [254] |
110,000 |
760 |
85,000 |
585 |
16 |
45 |
223–293 |
|
L (LH) |
10 [254] |
20 [508] |
110,000 |
760 |
85,000 |
585 |
14 |
40 |
223–293 |
|
M (MH) (N+Q&T) |
— |
4 [102] |
145,000 |
1000 |
120,000 |
825 |
15 |
45 |
293–352 |
|
M (MH) |
4 [102] |
7 [178] |
140,000 |
965 |
115,000 |
790 |
14 |
40 |
285–341 |
|
M (MH) |
7 [178] |
10 [254] |
135,000 |
930 |
110,000 |
758 |
13 |
40 |
269–331 |
|
M (MH) |
10 [254] |
20 [508] |
135,000 |
930 |
110,000 |
758 |
12 |
38 |
269–341 |
|
N (NH) (N+Q&T) |
— |
4 [102] |
170,000 |
1175 |
140,000 |
965 |
13 |
40 |
331–401 |
|
N (NH) |
4 [102] |
7 [178] |
165,000 |
1140 |
135,000 |
930 |
12 |
35 |
331–401 |
|
N (NH) |
7 [178] |
10 [254] |
160,000 |
1105 |
130,000 |
905 |
11 |
35 |
321–388 |
|
N (NH) |
10 [254] |
20 [508] |
160,000 |
1105 |
130,000 |
905 |
11 |
35 |
321–402 |
Key Features of ASTM A668 Forged Steel Components
High
mechanical strength and toughness
Excellent resistance to stress and fatigue
Uniform grain structure due to forging process
Good machinability and weldability
Suitable for heavy-duty and high-load applications
Versatile grades for different industrial requirements
Reliable performance in critical components
Applications of ASTM A668 Forged Steel Components
ASTM A668
forgings are widely used in industries requiring high strength and durability.
Power Plants
• Turbine shafts
• Generator components
Oil &
Gas Industry
• Drilling equipment
• Pipeline components
Heavy
Engineering
• Forged shafts and rollers
• Industrial machinery parts
Pressure
Vessels
• Structural components
• High-pressure fittings
Heat Treatment
Forgings are
typically normalized or quenched and tempered
Heat treatment improves strength, toughness, and fatigue resistance
Ensures uniform microstructure and performance
Conclusion
ASTM A668 /
A668M forged steel components provide a robust and reliable solution for heavy
industrial and engineering applications. With excellent strength, toughness, and
versatility across multiple classes, these forgings are ideal for critical
components operating under high stress and load conditions.
Ladhani
Metal Corporation supplies ASTM A668 / A668M forged steel components in various
classes, sizes, and custom specifications, ensuring high-quality products for
power plants, oil & gas, and heavy engineering industries.
FOR REQUIREMENT OF THIS GRADE OR FOR DETAIL CONTACT US AT :-
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