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AISI 4145 H MODIFIED Quenched & Tempered Bar

Alternative and trade names
EN 1.7225, ASTM 4145H, UNS G41450
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Description

AISI 4145H is a chromium – molybdenum low alloy tempered steel. It has improved hardenability and is more is commonly used in the high strength condition with min.110 KSI yield.

Related Standards

Properties

Dimension

Diameter d

38.1 - 508 mm

Mechanical

Elongation A

14.5 - 20 % at 20 °C

Hardness, Brinell HB

233 - 341 [-] at 20 °C

Impact strength, Charpy notched Ivnot

27 kJ/m² at -20 °C

Tensile strength Rm

896 - 1068 MPa at 20 °C

Yield strength Rp0.2 Rp0.2

689 - 758 MPa at 20 °C

Chemical properties

Element

Weight %

Comment

Cr

0.8 - 1.1 %

Mn

0.75 - 1 %

C

0.43 - 0.48 %

Mo

0.15 - 0.35 %

Si

0.15 - 0.35 %

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Technological properties

Application areas

AISI 4145H is a low alloy steel suitable for downhole drilling tools such as subs, x-overs, drill collars, pup-joints and fishing tools. General engineering applications include components exposed to heavy strain, such as shafts, gear, bolts etc. AISI 4145H can also be used in hardened condition as machine parts exposed to heavy wear.

Processing history

Hardened and tempered.

Welding

Poor, can be welded.

This material data has been provided by Sverdrup Steel.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.