AISI 4137 Alloy Steel (UNS G41370)

Sep 26 2012

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations

Introduction

Alloy steels comprise a broad spectrum of steels whose compositions are more than the limitations of C, Mo, Cr, Va, Mn, Ni, Si, and B which have been fixed for carbon steels. These steels are more responsive to mechanical and heat treatments than carbon steels.

The following datasheet will provide details about AISI 4137 alloy steel.

Chemical Composition

The following table shows the chemical composition of AISI 4137 alloy steel.

Element Content (%)
Iron, Fe 96.93-97.85
Chromium, Cr 0.80-1.10
Manganese, Mn 0.70-0.90
Carbon, C 0.35-0.40
Silicon, Si 0.15-0.35
Molybdenum, Mo 0.15-0.25
Sulfur, S ≤ 0.040
Phosphorous, P ≤ 0.035

Physical Properties

The physical properties of AISI 4137 alloy steel are outlined in the following table.

Properties Metric Imperial
Density 7.85 g/cm3 0.284 lb/in³

Mechanical Properties

The mechanical properties of AISI 4137 alloy steel are tabulated below.

Properties Metric Imperial
Elastic modulus 190-210 GPa 27557-30458 ksi
Bulk modulus (typical for steel) 140 GPa 20300 ksi
Shear modulus (typical for steel) 80 GPa 11600 ksi
Poisson’s ratio 0.27-0.30 0.27-0.30
Hardness, Brinell (annealed and cold drawn) 187-229 187-229
Hardness, Knoop (converted from Brinell hardness) 230 230
Hardness, Rockwell B (converted from Brinell hardness) 94 94
Hardness, Rockwell C (converted from Brinell hardness, value below normal HRC range, for comparison purposes only) 15 15
Hardness, Vickers (converted from Brinell hardness) 218 218
Machinability (based on 100 machinability for AISI 1212 steel) 70 70

Thermal Properties

The thermal properties of AISI 4137 alloy steel are tabulated below.

Properties Metric Imperial
Thermal conductivity 42.7 W/mK 296 BTU in/hr.ft².°F
Thermal expansion co-efficient (@0-100°C/32-212°F) 11.2 µm/m°C 6.22 µin/in°F

Other Designations

Equivalent materials to AISI 4137 alloy steel are:

AFNOR 40 CD 4 AFNOR 42 CD 4 DIN 1.7225 UNI 38 CrMo 4 KB UNI 40 CrMo 4 UNI G 4O CrMo 4
JIS SCM 4 JIS SCM 4 H SS 2244 B.S. 708 A 42 B.S. 708 M 40 B.S. 709 M 40
ASTM A322 ASTM A331 ASTM A505 ASTM A519 ASTM A547 SAE J404
SAE J412 SAE J770

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