4140 H Steel

Steel name: 4140 H
Diagram No.: 1438
SS designation: 2244
Mat.No. (Wr.Nr.) designation: 1.7225
AISI/SAE designation: 4140
ASTM designation: A304
AISI/SAE designation: J1268
JIS designation: SCM 4
Chemical composition in weight %: 0.37-0.44% C, 0.65-1.10% Mn, 0.20-0.35% Si, 0.75-1.20% Cr, 0.15-0.25% Mo
Steel group: Alloyed steel
Applications: This alloy finds many applications as forgings for the aerospace and oil and gas industries, along with myriad uses in the automotive, agricultural and defense industries, Typical uses are forged gears and shafts, spindles, fixtures, jigs and collar.
Comment: AISI 4140 H is an H-steel grade alloy steel, commonly called AISI 4140H chromium-molybdenum steel. The following datasheet will provide an overview of AISI 4140H alloy steel.
Reference: Not shown in this demo version.

Heat Treatment
Hardening: 815-845oC/oil
Tempering: 200-420oC

Hardenability Diagram

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Carbides in Steel
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Etchants Database
Hardenability Calculating Service
Macro Defects in Steel
Non-Metallic Inclusions in Steel
Tempering Diagrams of Steels

Disclaimer: The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other purposes. There is no representation that the recipient of this literature will receive updated editions as the become available.

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