Metals

Alloy Steel 4140 in Bar & Hollow Bored Bar

Specifications: Alloy 4140, AISI 4140, UNS G41400

Alloy 4140 is typically used in the Oil and Gas industry in applications such as gears, pumps and drills. 4140 from Castle Metals is available in round bar and hollow bar, with custom heat treating, cutting, boring and honing available.

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.

 

Chemistry (range or maximum in %)

GRADE C Mn P Max S Si Ni Cr Mo Other
4140 .38/.43 .75/1.00 0.035 0.04 .15/.35 - .80/1.00 .15/.25 -
41L40 .38/.43 .75/1.00 0.035 0.04 .15/.35 - .80/1.00 .15/.25 Pb
.15/.35
Purecut 40º .38/.43 .75/1.00 0.035 .02/.04 .15/.35 - .80/1.00 .15/.25 Bi
TREATED
Telcut 40º .38/.43 .70/1.00 0.035 .02/.04 .15/.35 - .80/1.00 .15/.25 Se
Supercut 150º TREATED
E4140 AIRCRAFT QUALITY .38/.43 .75/1.00 0.025 0.025 .15/.35 - .80/1.00 .15/.25 -
4140 PLATE .38/.44 .70/1.00 0.035 .015/.040 .15/.40 - .80/1.15 .15/.25 -

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
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 & 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 40º Rounds 3/8" - 4" Cold Finished & Annealed - 229 HBW MAX ASTM A29/A108 83%
Telcut 40º 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 AMS 6382 66%
3/4" - 10" Cold Finished & 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.
1 1/2"x Max.
Cold Finished & Annealed - 241 HBW MAX
1"x2" Man.
4"x6" Max.
Cold Finished & Annealed - 229 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-%
32 RC 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" - 4.125" 150 130 14 38

Grade 4140 Quenched and Tempered, Forged, Rough Turned Bar Properties

SPEC SIZE RANGE Tesnile-ksi Yield-ksi Elongation-% Red. Of Area-%
385/341 HBW Forged & RT 20" to 25" N/A N/A N/A N/A

Grade 4140 Oil & Gas Chemistry

GRADE Size Range C Mn P Max S Si Ni Cr Mo Cu Al
P110 1.5" - 7" .38/.43 .75/1.00 0.025 0.02 .15/.35 0.25 .80/1.10 .15/.25 0.35 0.02
>7" - 12" .15/.30
4140 Hot Rolled & Annealed All .40/.43 .75/1.00 0.02 0.025 .15/.30 0.25 .80/1.10 .15/.25 0.35 -
L80 All .43/.43 .75/1.00 0.025 0.025 .15/.30 0.25 .80/1.10 .15/.25 0.35 -

Grade 4140 Oil & Gas Properties

GRADE SHAPE SIZE RANGE CONDITION OF STEEL SPECIFICATION
P110 Rounds 1.5" - 7" Hot Rolled, Quenched & Tempered - 341 HBW MAX AT SURFACE ASTM A29/A322
>7" - 12" Hot Rolled, Quenched & Tempered - 341 HBW MAX AT SURFACE
Tubing 2" - 20" Hot Rolled, Quenched & Tempered ASTM A519
4140 Rounds 1" - 12" Annealed - 229 HBW MAX ASTM A29/A322
Tubing 2" - 20" Hot Rolled ASTM A519
L80 Rounds 2" - 12" Hot Rolled, Quenched & Tempered ASTM A29/A322
Tubing 2" - 20" Hot Finished, Quenched & Tempered ASTM A519

Grade 4140 Oil & Gas Products – minimum mechanical properties

GRADE SHAPE Tensile-ksi Yield-ksi Elongation-% Rad. Of Area-%
P110 Rounds 125 110 13 35
140 Mid-Radius
Tubing 125 110 13 13
L80 Rounds 100 Min 1" below surface 95 20 40
Tubing 95 80 20 16
4140 Hot Rolled & Annealed Rounds 125 105 30 60
Tubing 80 60 25 25