1. Flame Cutting – Best for Rough Sizing & Low‑Precision Needs
How it works
A high‑temperature flame melts and blows away metal to separate billets. It is often used on large cast billets directly from the continuous caster.
Typical product features
Rough, uneven end faces with slag residue
Heat‑affected zone (HAZ) near the cut
Lower dimensional accuracy (±5 mm or more)
No mechanical deformation
Which applications is it suitable for?
Heavy forging blanks where end surface quality is not critical
Large‑sized billets that cannot be easily sheared
Low‑cost, non‑precision components (e.g., counterweights, ballast)
Raw material for further hot rolling (rough cutting before re‑heating)
✅ Choose flame cutting if:
You need large quantities of pure iron billets for further processing (e.g., re‑melting, forging, or re‑rolling) and end‑face finish is not a priority. It is the most flexible and low‑cost option.
2. Hot Rolling – Best for Finished Products Requiring High Performance & Tight Tolerances
How it works
Heated billets pass through rollers to achieve precise dimensions, improve grain structure, and enhance mechanical properties.
Typical product features
Smooth, uniform surface
High dimensional accuracy (±0.5–1 mm)
Refined grain structure → better strength, toughness, and magnetic properties
Consistent internal quality
Which applications is it suitable for?
Magnetic cores, electromagnets, and soft magnetic components (DT4, DT4C grade pure iron)
Precision machinery parts requiring tight tolerances
Cold heading / cold forging wire – needs consistent structure
Automotive and aerospace components where reliability is critical
✅ Choose hot rolling if:
You are making end‑user parts that demand high purity, good magnetic performance, or mechanical strength. Hot rolling transforms the billet into a true "engineered material."
3. Shearing – Best for Clean, Fast Cutting of Smaller Sections
How it works
A mechanical shear (like giant scissors) cuts billets through plastic deformation and fracture.
Typical product features
Relatively flat, clean end faces (no slag)
End deformation (slight bulging or compression)
Work‑hardened shear‑affected zone (SAZ) near the cut
Good length accuracy but limited to smaller cross‑sections
Which applications is it suitable for?
Billets for machining – clean ends allow better clamping
Smaller‑size pure iron blanks (e.g., 50×50 mm up to 150×150 mm)
Products where end appearance matters but no extreme precision required
High‑volume cutting of identical lengths
✅ Choose shearing if:
You need a clean, slag‑free end face, your billet size is not too large, and you can tolerate slight end deformation. It is faster than flame cutting and avoids thermal damage, but the shear‑affected zone may affect surface hardness if you machine very close to the cut edge.
Quick Comparison – Which One Fits Your Need?
| Your priority | Recommended method |
|---|---|
| Lowest cost, rough sizing, large billets | Flame cutting |
| High purity + magnetic performance + tight tolerance | Hot rolling |
| Clean end, fast cutting, smaller sections | Shearing |
Final Advice
Do not simply pick the most expensive or "advanced" process. Ask yourself:
Will the billet go through further hot working? → Flame cutting is fine.
Is the final product a precision magnetic part? → You need hot rolling.
Do you just need clean, short blanks for machining? → Shearing is a good balance.
Always request a Material Test Certificate (MTC) and confirm which cutting / processing method was used. This small step helps you avoid performance issues and unnecessary costs.
Need help selecting the right pure iron billet for your application? Contact us with your drawing and usage – we will recommend the most suitable process, not just the most expensive one.
