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Material Supplied by

Sverdrup Steel AS

AISI 4140 MODIFIED Quenched & Tempered Bar

Alternative and trade names
EN 1.7225, UNS G41400, ASTM 4140
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Description

AISI 4140 is a 1% chromium – molybdenum medium hardenability general purpose high tensile steel.

Related standards

Properties

Dimension

Diameter d

25.4 - 508 mm

Mechanical

Elongation A

20 % at 20 °C

Hardness, Brinell HB

217 - 235 [-] at 20 °C

Impact strength, Charpy notched Ivnot

27 kJ/m² at -46 °C

Tensile strength Rm

690 MPa at 20 °C

Yield strength Rp0.2 Rp0.2

551 - 665 MPa at 20 °C

Chemical properties

Element

Weight %

Comment

Cr

0.9 - 1.2 %

Mn

0.75 - 1 %

C

0.38 - 0.43 %

Mo

0.15 - 0.35 %

Si

0.15 - 0.35 %

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Technological properties

Application areas

AISI 4140 modified is a low alloy hardened and tempered steel suitable for the manufacture of oil and gas downhole tools used in production and completion processes. General Engineering applications include construction components exposed to heavy strain, such as shafts, gear, bolts etc. AISI 4140 can also be used in hardened condition as machine parts exposed to heavy wear.

Processing history

Hardened at 850°C followed by water quenching. Tempering at min. 650°C, cooled in air.

Welding

Moderate, can be welded.