Square Billet vs Round Billet: Which Should You Choose?
How square and round billets compare for forging, ring rolling and rolling, and how to choose the right section.
Square billets
Square billets (100, 125, 160 mm) and square blooms (200, 250 mm) match the flat anvil faces of open die forging and stack and reheat evenly. They are the usual stock for shafts, flanges and bar rolling.
Round billets
Round billets, such as the 200 mm diameter section, give an even reduction around the circumference. That makes them the natural choice for ring rolling, discs, round shafts and gear blanks.
How to choose
Pick round when the forging or ring starts round and a square corner would be wasted. Pick square for flat-faced forgings and for rolling long products. Both are cast in carbon, alloy and stainless grades in lengths up to 12 metres.
Weight and size
A 200 mm round weighs about 245 kg per metre, and a 200 × 200 mm square about 310 kg per metre. Use the weight calculator for any size.
Related guides
Billet vs Bloom vs Slab: Differences Explained
How billets, blooms and slabs differ in section, process and end use, and which Kesari Alloys sizes are billets and which are blooms.
How to Choose the Right Billet Size for Forging and Rolling
A method to match billet or bloom section to the finished forging or rolled section, using reduction ratio and yield.
What Is a Steel Billet? Sizes, Grades and Uses
A plain guide to steel billets: how they are made, typical sizes, grades and where they are used.
Billet size chart · Weight calculator · Steel grade directory