Alloy 4140 in plate
SPECIFICATIONS:
Castle Metals stocks a wide range of Alloy 4140 plate distributed globally from our distribution centers in the U.S., Canada, Mexico, U.K, Singapore, and Shanghai. When our phone rings with 4140 plate inquiries, many customers also tell us they are overwhelmed with supply chain complexity. Where it makes sense, Castle Metals can simplify our customers' inbound network and reduce our customers' total cost of ownership.
Alloy 4140 (AISI 4140) is one of the most popular direct hardening Cr-Mo alloy steel plates that have the ability to develop an extensive range of hardness and strength. Alloying elements and thermal treatments, such as quenching and tempering, greatly influence the hardness and strength of the steel.
Alloy 4140 plate is widely used for general purpose industrial machining. Welding and forming of this steel plate should be avoided. It is best utilized wherever high resistance to fatigue and or impact is necessary.
Bar Properties
Grade 4140 Hot Roll and Annealed Bar Properties
Grade |
shape |
Size Range |
Condition of Steel |
Specification |
Relative Machinability Based on aisi 1212 as 100% |
4140 |
Rounds
|
3/4" - 30" |
Hot Rolled/ As Rolled |
ASTM A29/A322 |
66% |
Hot Rolled &Annealed |
ASTM A29/A322 |
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Annealed & Forged & Rough Turned |
ASTM A29/A322 |
||||
Cold Finished & Annealed- 229 HBW MAX |
ASTM A29/A108 |
||||
Hexagons | 7/16" - 4" | Cold Finished & Annealed- 229 HBW MAX |
ASTM A29/A108 |
66% |
|
Squares | 1/4"- 4" | Cold Finished & Annealed- 229 HBW MAX |
ASTM A29/A108 |
66% |
|
41L40 | Rounds |
3/16"- 6" |
Hot Rolled and Annealed |
ASTM A29/A322 |
83% |
Cold Finished & Annealed- 229 HBW MAX |
ASTM A29/A108 |
||||
Hexagons | 1/4" - 3" | Cold Finished & Annealed- 229 HBW MAX |
ASTM A29/A108 |
83% |
|
Purecut 40 |
Rounds |
3/8-4" | Cold Finished & Annealed- 229 HBW MAX |
ASTM A29/A108 |
83% |
Telcut 40 |
Rounds |
1/4" - 3" |
Cold Finished & Annealed- 229 HBW MAX |
ASTM A29/A108 |
83% |
E4140 AQ | Rounds |
1/4" - 4" |
Cold Finished & Annealed- 241 HBW MAX |
|
66% |
3/4" - 10" |
Hot Rolled M.S. & Annealed- 229 HBW MAX |
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Hexagons |
1/2" - 1 1/2" |
Cold Finished & Annealed- 241 HBW MAX |
|||
Squares |
1/2" - 1 1/2" | Cold Finished & Annealed- 241 HBW MAX |
|||
Flats | 1/2" - 1 1/2" | Cold Finished & Annealed- 241 HBW MAX |
|||
1/4"x1" Min. |
Cold Finished & Annealed- 241 HBW MAX |
||||
1"x2" Min 4"x6" Min |
Hot Rolled & Annealed- HBW MAX |
Castle 4140 annealed bars are 80% minimum lamellar pearlite for improved machinability
Grade 4140 Quenched and Tempered "Stress Free" Bar
Minimum Properties
spec | size range |
Tensile-ksi |
yield-ksi |
elongation-% | Red. of area-% |
35RC MAX/ 321 HBW MAX ASTM A193 B7 ASTM A434 BC |
To 1.5" |
130 |
110 |
16 |
50 |
>1.5" To 2.5" |
125 |
105 |
16 |
50 |
|
>2.5" To 4" |
115 |
95 |
16 |
50 |
|
285/321 HBW ASTM A434 BC |
> 4" to 7" |
110 |
85 |
16 | 45 |
285/341 HBW ASTM A434 BC |
>7" to 9.5" |
105 | 80 | 15 | 40 |
285/341 HBW HR ROUNDS |
>9.5" to 12" |
Reported | Reported |
Reported |
Reported |
SUPERCUT 150 32/37 RC ROUNDS |
1" to 4.125" |
150 |
130 |
14 |
38 |
Grade 4140 Quenched and Tempered, Forged, Rough Turned Bar Properties
Spec | size range |
tensile-ksi | Yield-ksi |
elongation-% |
Red. of area-% |
285/341 HBW Forged & RT |
10" to 25" |
NA |
NA |
NA |
NA |
For more information, see Alloy Steel Quick Guide
Chemistry(range or Maximum in %)
Chemistry (range or Maximum in %)
Grade | Thickness | C |
Mn | P |
S |
Si |
Ni |
Cr |
Mo |
AISI 4140 |
1/4" thru 14" | .36/.44 | .70/1.00 | 0.035 | 0.04 | .15/.40 | - | .80/1.15 | .15/.25 |