AISI 8640 Alloy Steel (UNS G86400)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Other Designations

Introduction

Alloy steels contain various types of steels whose compositions are more than the limitations of C, Mo, Cr, Va, Mn, Ni, Si, and B assigned for carbon steels. These steels are more responsive to mechanical and heat treatments than carbon steels.

The following datasheet will provide details about AISI 8640 alloy steel.

Chemical Composition

The chemical composition of AISI 8640 alloy steel is outlined in the following table.

Element Content (%)
Manganese, Mn 0.75-1.00
Nickel, Ni 0.40-0.70
Chromium, Cr 0.40-0.60
Carbon, C 0.38-0.43
Silicon, Si 0.15-0.30
Molybdenum, Mo 0.15-0.25
Sulfur, S 0.04 (max)
Phosphorus, P 0.035 (max)

Physical Properties

The following table shows the physical properties of AISI 8640 alloy steel.

Properties Metric Imperial
Density 7.7-8.03 g/cm3 0.278-0.290 lb/in3

Mechanical Properties

The mechanical properties of AISI 8640 alloy steel are displayed in the following table.

Properties Metric Imperial
Elastic modulus 190-210 GPa 27557-30458 ksi
Poisson's ratio 0.27-0.30 0.27-0.30

Other Designations

Equivalent materials to AISI 8640 alloy steel are outlined in the table below.

DIN 1.6546 UNI 40 NiCrMo 2 KB B.S. Type 7 ASTM A322 ASTM A331
ASTM A506 ASTM A519 SAE J404 SAE J412 SAE J770
ASTM A29 ASTM A752 ASTM A829 SAE J1397 MIL SPEC MIL-S-16974

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