300M Alloy Steel Round Bars High Quality Suppliers
300M Alloy Steel Round Bars High Quality Suppliers
Model
300M

Item specifics

Delivery Condition
normalised and tempered/softened

Review

Description

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)