300M Alloy Steel Round Bars High Quality Suppliers

Categories	Alloy Steel Bars
Brand	fushun
Model	300M
Delivery Condition	normalised and tempered/softened
Update Time	Apr 30,2025

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Detail Information

Introduce

300M is a high performance alloy steel which is a vacuum melted grade, supplied in the normalised and tempered/softened condition to enhance machinability prior to final heat treatment.

It has a combination of ultra high strength, good fatigue resistance and excellent transverse properties, and as such finds many applications in the aerospace industry, such as undercarriage components, gears and shafts.

Applications

300M can be used in a variety of applications, here are just a few examples:

*Undercarriage components

*Gears

*Shafts

*Aircraft landing gear

*High strength bolts

Standard

AMS 6417, ASTM A579

Properties

Density: 7.85 g/cm^3

Specific Heat Capacity: 448 J/kg*K

Coefficient of Thermal Expansion from -17.8-93°C: 11.34 µm/mm/°C

Chemical Component %

C	Si	Mn	P	S	Cr	Mo	Ni	V
0.38-0.46	1.45-1.8	0.6-0.9	0.01	0.01	0.7-0.95	0.3-0.65	1.65-2	0.05

Mechanical Properties

Mechanical & Physical Properties	21 °C
Ultimate Tensile Strength /MPa	1981
0.2% Yield Strength /MPa	1672
Reduction of area %	35
Elongation %	10
Room Temperature Hardness/ Rockwell C	58

(Normalised at 927 °C for 1 hour+air cool/Austenitised at 871°C for 1 hour + oil quench/Tempered at 302°C for 1 hour+air cool)

Hardness at Various Tempering Temperature	204°C	316°C	427°C	538°C	649°C
Hardness / Rockwell C	53	52.5	50	47	35

(Austenitised at 871°C for 1 hour + oil quench/Tempered for 2+2 hour+air cool)