Alloy 4140 in bar, plate, and tube
SPECIFICATIONS: GRADE ALLOY 4140, AISI 4140, UNS G41400
Castle Metals stocks a wide range of Alloy 4140 in bar distributed globally from our distribution centers in the U.S., Canada, Mexico, U.K, Singapore, and Shanghai. Customers calling for 4140 a lot of times are upset about dealing with fluctuations in their build schedules. Sometimes, we find that custom stocking programs help our customers react faster to changes.
Alloy 4140 is a direct hardening alloy that can be quenched and tempered to obtain a wide range of hardness, ductility and strength levels. These results are influenced by both the thermal treatment applied and the alloying elements present.
The Purecut® series offers our customers the opportunity to improve machinability with the addition of Bismuth. Bismuth steels will machine equal to leaded steels without any of the environmental problems.
E4140 Aircraft Quality is a chrome-moly alloy produced in Electric Furnaces and Vacuum Degassed. When quenched and tempered, it is a relatively deep hardening steel.
This strong alloy is used for its good hardness penetration and hardness uniformity. Its high machinability and ability to maintain its properties at high temperatures make this alloy useful in many industries.
Bar Properties
Grade 4140 Hot Roll and Annealed Bar Properties
Grade | Shape | Size Range | Condition of Steel | Specification | Relative Machinability |
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Rounds |
| Hot Rolled/ As Rolled | ASTM A29/A322 | 66% |
Hot Rolled &Annealed |
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Annealed & Forged & Rough Turned |
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Cold Finished & Annealed- 229 HBW MAX |
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Hexagons | 7/16" - 4" | Cold Finished & Annealed- 229 HBW MAX |
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Squares | 1/4"- 4" | Cold Finished & |
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41L40 | Rounds | 3/16"- 6" | Hot Rolled and Annealed |
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Cold Finished & Annealed- 229 HBW MAX |
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Hexagons | 1/4" - 3" | Cold Finished & Annealed- 229 HBW MAX |
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Purecut 40 | Rounds | 3/8-4" | Cold Finished & Annealed- 229 HBW MAX |
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Telcut 40 | Rounds | 1/4" - 3" | Cold Finished & Annealed- 229 HBW MAX |
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E4140 AQ | Rounds | 1/4" - 4" | Cold Finished & Annealed- 241 HBW MAX |
| 66% |
3/4" - 10" | Hot Rolled M.S. & Annealed- 229 HBW MAX | ||||
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 | 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
Specification | Size Range | Tensile-ksi | Yield-ksi | Elongation-% | Red. of area-% |
35RC MAX/ | 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 | > 4" to 7" | 110 | 85 | 16 | 45 |
285/341 HBW | >7" to 9.5" | 105 | 80 | 15 | 40 |
285/341 HBW | >9.5" to 12" | Reported | Reported | Reported | Reported |
Grade 4140 Hot Roll and Annealed Bar Properties
Grade | Shape | Size Range | Condition of Steel | Specification | Relative Machinability |
|
Rounds |
| Hot Rolled/ As Rolled | ASTM A29/A322 | 66% |
Hot Rolled &Annealed |
| ||||
Annealed & Forged & Rough Turned |
| ||||
Cold Finished & Annealed- 229 HBW MAX |
| ||||
Hexagons | 7/16" - 4" | Cold Finished & Annealed- 229 HBW MAX |
|
| |
Squares | 1/4"- 4" | Cold Finished & |
|
| |
41L40 | Rounds | 3/16"- 6" | Hot Rolled and Annealed |
|
|
Cold Finished & Annealed- 229 HBW MAX |
| ||||
Hexagons | 1/4" - 3" | Cold Finished & Annealed- 229 HBW MAX |
|
| |
Purecut 40 | Rounds | 3/8-4" | Cold Finished & Annealed- 229 HBW MAX |
|
|
Telcut 40 | Rounds | 1/4" - 3" | Cold Finished & Annealed- 229 HBW MAX |
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E4140 AQ | Rounds | 1/4" - 4" | Cold Finished & Annealed- 241 HBW MAX |
| 66% |
3/4" - 10" | Hot Rolled M.S. & Annealed- 229 HBW MAX | ||||
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 | 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
Specification | Size Range | Tensile-ksi | Yield-ksi | Elongation-% | Red. of area-% |
35RC MAX/ | 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 | > 4" to 7" | 110 | 85 | 16 | 45 |
285/341 HBW | >7" to 9.5" | 105 | 80 | 15 | 40 |
285/341 HBW | >9.5" to 12" | Reported | Reported | Reported | Reported |
SUPERCUT 150 | 1" to 4.125" | 150 | 130 | 14 | 38 |
Grade 4140 Quenched and Tempered, Forged, Rough Turned Bar Properties
Specification | Size Range | Tensile-ksi | Yield-ksi | Elongation-% | Red. of area-% |
285/341 HBW | 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 | C | mn | p max | s | si | ni | cr | mo | other |
4140 | .38/.43 | .75/1.00 | .035 | 0.04 |
| - | .80/1.00 | .15/.25 | - |
41L40 | .38/.43 | .75/1.00 | .035 | 0.04 | .15/.30 | - | .80/1.00 | .15/.25 | Pb |
.15/.35 | |||||||||
Purecut 40 | .38/.43 | .75/1.00 | .035 | .02/.04 | .15/.30 | - | .80/1.00 | .15/.25 | Bi |
TREATED | |||||||||
Telcut 40 | .38/.43 | .70/1.00 | .035 | .02/.04 | .15/.35 | - | .80/1.10 | 15/.25 | Se |
Supercut 150 | TREATED | ||||||||
E4140 | .38/.43 | .75/1.00 | .025 | .15/.35 | .15/.35 | - | .80/1.10 | .15/.25 | - |
4140 | .38/.44 | .70/1.00 | .035 | .15/.40 | .15/.40 | - | .80/1.15 | .1/.25 | - |