Metalssteel

Alloy Steel

Quenched and tempered alloy steel used to reach property classes 10.9 and 12.9.

Stock forms — Round bar, hex bar, plate and tube⌀ dround barshex bartwplateODwall ttube
Alloy Steel — stock formsSymbols only — no stock sizes are published

Properties

Family
Metals
Category
steel
Density
7.85 g/cm³ · 7850 kg/m³
Typical property classes
Property Class 10.9, Property Class 12.9, SAE J429 Grade 8

Densityhow alloy steel compares

Density of Alloy Steel — 7.85 g/cm³Alloy Steel7.85Water1.00Aluminium2.700369g/cm³
7.85 g/cm³ — 7850 kg/m³Water 1.00 · Aluminium 2.70

Applicationswhere alloy steel is normally specified

Automotive suspensionHigh-preload jointsPressure vesselsHeavy machinery

Property classesstrength classes used with alloy steel

All classes
Property Class 10.9Property Class 12.9SAE J429 Grade 8

Practical notes

  • 12.9 is sensitive to hydrogen embrittlement when plated

Tools used on itmatched on the metals family, not on this page

All tools
CountersinkDrillHole SawImpact DriverImpact WrenchJigsawMitre SawRandom Orbit SanderTap and Die SetTwist Drill Bits

Which tools work a material is a property of the family (Metals), not of the individual species — so this list is the same on every metals page, and changes when the tool data changes rather than when this paragraph does.

Used in these projectsbuilds whose bill of materials calls for it

All projects
Repairing a Stripped Threaded HoleReplacing a Stripped Set Screw

Browse

ISO 898-1SAE J429All materialsAll standards