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AISI 4142H Alloy Steel Solid Bar UNS H41420

AISI 4142H Alloy Steel Solid Bar UNS H41420

AISI 4142H Alloy Steel Solid Bar UNS H41420
CategoriesQuenched and Tempered Steel Bars
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ModelUNS H41420,4142H
ProductHardened steel
Applicationhighly stressed components
Similar steel grades4142H,4145H
FOB portshanghai
Terms of PaymentL/C, T/T
Update Time2019-01-21
Detail Information


Steel is a metal alloy chiefly consisting of iron in addition to small amounts of carbon based on the grade and quality of the steel. Alloy steel is a type of steel to which one or more elements besides carbon have been added to form a desired mechanical property.

AISI 4142H is a chromium-molybdenum steel whose mechanical properties and toughness can be improved after heat treatment. The following section will discuss in detail about AISI 4142H alloy steel.

Chemical Composition

The chemical composition AISI 4142H alloy steels is outlined in the following table.

ElementContent (%)
Iron, Fe96.615 - 97.91
Chromium, Cr0.75 - 1.2
Manganese, Mn0.65 - 1.1
Carbon, C0.39 - 0.46
Silicon, Si0.15 - 0.30
Molybdenum, Mo0.15 - 0.25
Sulfur, S≤ 0.040
Phosphorous, P≤ 0.035

Physical Properties

The following table shows the physical properties of AISI 4142H alloy steels.

Density7.85 g/cm30.284 lb/in3

Mechanical Properties

The mechanical properties of AISI 4142H alloy steels are displayed in the following table.

Modulus of elasticity205 GPa29700 ksi
Bulk modulus140 Gpa20300 ksi
Shear modulus80 Gpa11600 ksi
Poisson’s ratio0.290.29
Hardness, Brinell187 - 229187 - 229
Hardness, Vickers218218
Hardness, Knoop230230
Hardness, Rockwell C1515
Hardness, Rockwell B9494

Thermal Properties

The thermal properties of AISI 4142H alloy steels are given in the following table

Thermal conductivity42.6 W/mK296 BTU.in/hrft².°F

Other Designations

Other designations that are equivalent to AISI 4142H alloy steels include the following.

  • DIN 1.7223
  • UNI 38 CrMo 4
  • ASTM A304
  • SAE J1268


The following are the list of applications of AISI 4142H alloy steels:

  • Break and bending dies
  • Die holders
  • Flanges
  • Collets
  • Spindles, axles, clutch parts
  • Forming rolls
  • Machine tool components
  • Wrenches and other hand tools

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