QUICK COMPARISON TABLE

RELATIVE FLAME TEMPERATURES

Approximate maximum flame temperatures in oxygen:

• Oxy/Acetylene: ~5720°F / 3160°C
• Oxy/Propane: ~5110°F / 2825°C
• Oxy/Propylene: ~5300–5400°F / ~2900°C
• Oxy/Chemtane: similar to propylene blends

WHAT ACTUALLY MATTERS MORE THAN FLAME TEMPERATURE

ACETYLENE

• More heat is concentrated in the inner cone
• Extremely focused flame
• Faster piercing
• Better puddle control for fusion welding
• Easier to gas weld steel

Best for:

• gas welding
• brazing
• sheet metal work
• precision heating
• quick starts on thick cuts

PROPANE

• More heat in the outer cone
• Broader flame
• Slower preheat
• Excellent total BTU output

Best for:

• rosebud heating
• bending
• large heating jobs
• scrap cutting
• long production cuts

Propane is usually cheaper per hour to run, but it consumes more oxygen.

PROPYLENE / CHEMTANE

• Hotter and faster than propane
• Cleaner cuts
• Less slag
• Better preheat behavior
• Less tip fouling
• Still not ideal for traditional gas welding steel

Common in:

• CNC oxyfuel cutting
• heavy plate cutting
• production torch work
• lower-cost cutting operations

REAL-WORLD DIFFERENCES

1. WELDING CAPABILITY

Acetylene remains the standard for traditional oxy-fuel steel welding because of the concentrated reducing flame and high inner cone temperature.

2. HEATING PERFORMANCE

For rosebud heating, propane and propylene blends are commonly preferred because they provide high total BTU output economically.

3. CUTTING PERFORMANCE

Acetylene starts cuts faster. Propylene and Chemtane often outperform propane in production cutting.

4. COST

Typical ranking from most expensive to least:

1. Acetylene
2. Propylene / Chemtane
3. Propane

Note:
Propane may use substantially more oxygen, which changes real operating cost.

5. SAFETY & HANDLING

ACETYLENE

• Unstable at higher pressures
• Special cylinder handling required
• Cannot safely exceed certain withdrawal rates
• More sensitive fuel

PROPANE / PROPYLENE / CHEMTANE

• More stable
• Easier storage
• Safer transport characteristics
• Better for high-volume industrial use

TORCH & TIP DIFFERENCES

You generally cannot run propane, propylene, or Chemtane effectively through standard acetylene cutting tips.

Alternative fuels usually require:

• injector-style torches
• multi-piece cutting tips
• larger preheat orifices

Verify:

• torch fuel compatibility
• mixer type
• tip series
• regulator compatibility
• hose rating (Grade T preferred for alternative fuels)

BEST CHOICE BY APPLICATION

BOTTOM LINE

• Choose oxy/acetylene if you need welding capability, precision flame control, or fast piercing.
• Choose oxy/propane for economical heating and general cutting.
• Choose oxy/propylene or oxy/chemtane when you want a balance of lower cost, fast cutting, cleaner cuts, and better production efficiency.

For most modern cutting-only shops:

• Propylene blends are replacing acetylene
• Propane remains common for budget heating/cutting
• Acetylene still dominates gas welding and repair work