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Introduction
AS 3679 is an Australian/New Zealand Standard that specifies the requirements for the production and supply of hot-rolled structural steel bars and sections. The 300 series steel grades are widely used for general structural and engineering applications.

Common Steel Grades
The common steel grades specified in AS 3679 in the 300 Series include:

Grade 300: This grade is suitable for a wide range of structural applications and has a minimum yield strength of 300 MPa.
Grade 300L0: This grade is designed for applications requiring low-temperature impact resistance, tested at 0°C.
Grade 300L15: This grade is designed for applications requiring low-temperature impact resistance, tested at -15°C.
Grade 300S0: This grade is designed for seismic applications and complies with the seismic material requirements in NZS 3404.

Chemical Composition
The chemical composition for these grades is generally similar, with some variations to meet specific requirements. Below is a typical composition for Grade 300 Series:

Element	Max Content (wt.%)
Carbon (C)	0.2500
Manganese (Mn)	1.6000
Phosphorus (P)	0.0400
Sulfur (S)	0.0400
Silicon (Si)	0.5000
Nickel (Ni)	0.5000
Chromium (Cr)	0.3000
Molybdenum (Mo)	0.1000
Copper (Cu)	0.5000
Vanadium (V)	0.0300
Titanium (Ti)	0.0400
Niobium (Nb)	0.0200
Aluminum (Al)	0.1500

Mechanical Properties
The mechanical properties of Grade 300 Series vary based on thickness:

Thickness (mm)	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%)
< 11	≥ 320	≥ 440	≥ 22(300,300L0)	≥ 25 (300L15,300S0)
11 - 17	≥ 300	≥ 440	≥ 22(300,300L0)	≥ 25 (300L15,300S0)
> 17	≥ 280	≥ 440	≥ 22(300,300L0)	≥ 25 (300L15,300S0)

Advantages And Applications
Advantages
● High Strength and Toughness: Suitable for demanding structural applications.
● Good Weldability: Compatible with various welding processes, ensuring strong and durable connections.
● Wide Range of Applications: Versatile for different structural and engineering projects.
● Comprehensive Standards: Ensures consistent quality and reliability.

Applications
AS 3679 steel is used in a wide range of applications, including:

● Construction: Building structures, bridges, and infrastructure.
● Engineering: Machinery, equipment, and manufacturing.
● Transportation: Railway tracks, vehicle components, and other transportation-related applications.

Differences Between Grades
● Grade 300: General-purpose structural steel with a minimum yield strength of 300 MPa.

● Grade 300L0: Includes low-temperature impact resistance tested at 0°C, making it suitable for colder climates.

● Grade 300L15: Includes low-temperature impact resistance tested at -15°C, providing enhanced toughness in very cold environments.

● Grade 300S0: Designed for seismic applications, ensuring better performance in earthquake-prone areas.

The choice depends on welding needs, environmental conditions, and machining requirements. AS 3679 provides a versatile range of structural steels to suit various engineering demands.

AS 3679 300 Series Steel Grades

Standard: AS 3679 (Australian Standard for Structural Steel) Grade: 300,300L0, 300L15, 300S0 The standard applies to carbon and carbon-manganese steels supplied in the following forms: Hot-rolled plates, sheets, and strips Hot-rolled structural sections (e.g., beams, channels, angles) Bars for structural use It does not cover cold-formed steel (which falls under AS 1163) or stainless steel.

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