AISI 4140 seamless pipe is tubing made to the pipe schedule. Alloy pipe in the power industry generally refers to A335 material, but in the oil and gas market, AISI 4140 pipes is used. This product is made to the pipe schedule but uses A519-4140 as the controlling Seamless specification. The material is then heat treated to L80, P110 or the customer’s specified properties. This material is easily welded and is generally used for above ground applications and utilizes the fittings, flanges and other piping components with the same 4140 chemistry. This product is a good alternative to replace X65 through X80 piping items where the usage or repair is too small for mill production.

Specifications of AISI 4140 Pipes

Standard

Alloy Steel

AISI 4140 Alloy Steel

UNS G41400

AISI 4340 Alloy Steel

UNS G43400

AISI 4140 Alloy Steel

UNS G41400

AISI 8620 Alloy Steel

UNS G86200

List Of AISI 4140 Types

Prosaic Steel Supply stocks a full range of the following A335 pipe grades

Size Range

2″ – 12”

Schedules

20, 30, 40, Standard (STD), Extra Heavy (XH), 80, 100, 120, 140, 160, XXH & heavier

Standard

ASTM A519

Grade

AISI 4140, L80, L110

Chemical composition % of A519 4140 Alloy Steel Seamless Pipe

Element

Content (%)

Iron, Fe

96.785 - 97.77

Chromium, Cr

0.80 - 1.10

Manganese, Mn

0.75 - 1.0

Carbon, C

0.380 - 0.430

Silicon, Si

0.15 - 0.30

Molybdenum, Mo

0.15 - 0.25

Sulfur, S

0.040

Phosphorous, P

0.035

Physical Properties A519 4140 Alloy Steel Seamless Pipe

Properties

Metric

Imperial

Density

7.85 g/cm3

0.284 lb/in³

Melting point

1416°C

2580°F

Fabrication and Heat Treatment:

Mechanical Properties of A519 4140 Alloy Steel Seamless Pipe and Tubes

Properties

Metric

Imperial

Tensile strength

655 MPa

95000 psi

Yield strength

415 MPa

60200 psi

Bulk modulus (typical for steel)

140 GPa

20300 ksi

Shear modulus (typical for steel)

80 GPa

11600 ksi

Elastic modulus

190-210 GPa

27557-30458 ksi

Poisson's ratio

0.27-0.30

0.27-0.30

Elongation at break (in 50 mm)

25.70%

25.70%

Hardness, Brinell

197

197

Hardness, Knoop (converted from Brinell hardness)

219

219

Hardness, Rockwell B (converted from Brinell hardness)

92

92

Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only)

13

13

Hardness, Vickers (converted from Brinell hardness)

207

207

Machinability (based on AISI 1212 as 100 machinability)

65

65

Thermal Properties A519 4140 Alloy Steel Seamless Pipe and Tubes

Properties

Metric

Imperial

Thermal expansion co-efficient (@ 0-100°C/32-212°F)

12.2 µm/m°C

6.78 µin/in°F

Thermal conductivity (@ 100°C)

42.6 W/mK

296 BTU in/hr.ft².°F

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