Maximizing Efficiency with Grade 260 Steel in Fabrication and Welding

grade 260 steel, also known as AS/NZS 3678 Grade 250, is a structural steel with a minimum yield strength of 260 MPa. In fabrication and welding, maximizing efficiency requires a strong understanding of its mechanical properties, chemical composition, and appropriate techniques.

Mechanical Properties:
– Yield Strength: 260 MPa
– Tensile Strength: 360-480 MPa
– Elongation: 20% (in 200mm)
– Hardness: Brinell hardness typically ranges from 119 to 235 HB

Chemical Composition:
– Carbon (C): 0.12-0.2%
– Manganese (Mn): 1.2% maximum
– Phosphorus (P): 0.040% maximum
– Sulfur (S): 0.040% maximum
– Silicon (Si): 0.3% maximum

In order to maximize efficiency in fabrication and welding with grade 260 steel, it is crucial to consider the following factors:

1. Preheating and Post Weld Heat Treatment: Grade 260 steel may require preheating and post-weld heat treatment to reduce the risk of hydrogen-induced cracking and to improve the overall weld quality.

2. Welding Techniques: Proper welding techniques such as using low hydrogen electrodes, maintaining proper arc voltage and travel speed, and employing back gouging for thicker sections can help achieve high-quality welds.

3. Material Handling and Forming: Understanding the material’s ability to withstand forming processes, such as bending and rolling, is essential to prevent any brittleness or cracking.

4. Cutting and Machining: Correct cutting and machining techniques are necessary to avoid work hardening, as well as to achieve the desired dimensional accuracy and surface finish.

By optimizing the fabrication and welding processes with grade 260 steel, manufacturers can ensure the production of durable and reliable structures while maximizing efficiency in terms of time, resources, and cost.
Grade 260 Steel grade
1699410226