Carbon Steel Hemispheres
Spun half balls with a 45° welding groove up to 16mm thick the starting point for a fire pit ball or a welded sphere.
Overview
Spun carbon steel hemispheres are formed from a single sheet, so there is no seam across the face. The 45° welding groove is the important detail: it makes the weld between two halves clean, and it is easy to grind and polish afterwards, which is exactly what a fire pit ball or an ironwork sphere needs.
Stamp pressed hemispheres cover the small sizes with a smooth surface that takes powder coating. Hand assembled hemispheres remove the mould limit entirely, so any size from ∅200mm upward can be made, with visible seams that are ground burr free.
Production Methods
The forming route decides the size range, the wall thickness and whether the seam ever shows.
Spinning
An entire steel sheet is formed by spin moulding. This is the thickest option and the easiest to weld into a sphere.
- Thickness 2mm to 16mm (14GA to 5/8 inch)
- Size ∅89mm to ∅3500mm
- 45° welding groove
- No visible welding seams on the surface
- Standard mould limit
Stamping press
The sheet is shaped by deforming it with a die. Smooth surface, suits powder coating for art design.
- Thickness 1mm to 3mm (20GA to 12GA)
- Size ∅19mm to ∅700mm
- No visible welding seams
- Standard mould limit
Assembling
Sheet is developed, bent to leaf shapes and welded by hand into a complete hemisphere. No mould limit, any size.
- Thickness 1mm to 6mm (20GA to 3GA)
- Size ∅200mm to ∅3500mm
- Visible welding seams, burr free
- No standard mould limit
Specifications
- Material
- Q235 carbon steel
- Size range
- ∅6mm to ∅3500mm
- Thickness
- 0.6mm to 16mm depending on forming route
- Key feature
- 45° welding groove on spun hemispheres
- Finish
- Raw finished, powder coated, or left to patinate
Who This Category Is For
- Metal artists building their own fire pit balls
- Blacksmiths and iron craft workshops
- Sculpture fabricators
- Industrial customers needing thick formed heads
Problems It Solves
- Welding two halves into a true sphere by eye. The 45° groove aligns and fills the joint correctly.
- Assembled hemispheres are hard to close accurately. Spun hemispheres are the right choice if you plan to weld the sphere yourself.
- Plasma cutter capacity limits. Pick a thickness below your machine's maximum cut to avoid heavy burrs.
Why Buy From Maoping
- Seamless face on spun hemispheres up to 16mm
- Any size above ∅200mm by hand assembly, no tooling cost
- ∅600mm (24 inch) is the most economical size to ship by courier for prototyping
Application Scenarios
- Fire pit balls
- Welded sphere assembly
- Ironwork and sculpture
- Formed heads
Products in Carbon Steel Hemispheres
3 products in this category.
Explore Further
Related categories
Industry applications
Carbon Steel Hemispheres FAQ
Spun or assembled for a fire pit ball?
What thickness do most fire pit customers buy?
What size hemisphere should I order for a prototype?
Is there a seam across the face?
Request A Quote for Carbon Steel Hemispheres
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