Oxy-fuel flame cutting service

1. Basic Definition & Cutting Principle

1. Preheating Stage: Acetylene or propane mixed with oxygen generates high-temperature flame at around 3000°C, heating local steel plates to ignition point (700–900°C).
2. Oxidation Cutting: High-pressure pure oxygen is injected to trigger violent oxidation of iron with heat release, producing low-melting iron oxide slag.
3. Slag Discharging & Forming: Continuous high-pressure oxygen flow blows away molten slag to form regular cutting kerf and complete plate separation.

2. Processable Materials & Thickness Range

(1) Applicable Steel Grades (ferritic carbon steel & low alloy steel only)

• Ordinary carbon steel plate: Q235B, Q355B, 45#, 20#
• Wear-resistant steel plate: NM400, NM450, NM500
• Pressure vessel steel plate: A516Gr60, 16MnDR
• High-strength low alloy plate: S355JR, Q690

(2) Unprocessable Materials

(3) Machinable Thickness

• Preferred range: Medium & extra-thick steel plates of 10–300mm
• Standard limit: 0.5–500mm; heavy-duty cutting torch can cut steel billets over 900mm
• Disadvantage: Thin plates below 6mm tend to collapse with rough cut surfaces; laser or plasma cutting is preferred.

3. Service Processing Capacity (Standard CNC Cutting)

1. Processing Table Size: Standard worktable 12000×3000mm; large-scale equipment supports steel plates up to 25m in length
2. Processing Types:
   • Custom shape cutting per drawings: square, circle, flange, irregular mechanical base, excavator bucket blanks
   • Linear blanking, square block cutting, annular ring cutting, integrated forming of V/Y welding bevel
   • Simultaneous multi-head batch cutting for high-efficiency mass production
3. Dimensional Tolerance: ±1.5mm for standard cutting; ±0.8mm for precision cutting with excellent verticality of cutting surface
4. Supporting Post-processing: Deburring, leveling, sandblasting, drilling and integrated secondary machining after cutting

4. Core Advantages (vs Laser / Plasma / Waterjet Cutting)

1. Lowest cost for extra-thick plates: Operating cost for plates over 100mm is only 35% of laser cutting, with low equipment investment, ideal for mass blanking in heavy steel structure industry
2. Unlimited cutting thickness: Laser and plasma cutting are restricted by power, while oxy-fuel cutting is the only economical solution for heavy machinery, ship plates and mold steel billets
3. On-site operation available: Hand-held cutting torch allows outdoor construction cutting on-site without workshop equipment restrictions
4. Low-cost & durable consumables: Long service life of cutting nozzles, low unit price of gas and oxygen consumables with outstanding cost performance for bulk orders

5. Downstream Industries & Application Scenarios

1. Steel Structure Engineering: Factory beams & columns, bridge thick plates, tower crane bases, embedded part blanking
2. Heavy Machinery: Mine crusher housings, wear-resistant excavator bucket edges, engineering machinery bases
3. Pressure Vessel & Boiler: Tube sheets, flanges, thick plate blanks for cylinder bodies
4. Shipbuilding & Heavy Industry: Marine decks, thick structural plates for hulls
5. Mold Manufacturing: Thick mold steel blocks, counterweights, machine tool bases
6. Infrastructure Heavy Industry: Shield machine accessories, wear parts for construction machinery

6. Standard Service Process

1. Customer Submission: CAD drawing / DXF file, steel grade, thickness, quantity and bevel requirements
2. Quotation: Cost calculation covering raw steel plate, cutting working hours, gas consumables and processing fees
3. CNC Programming: Drawings imported to cutting machine with optimized nesting to reduce material waste
4. CNC Oxy-fuel Cutting: Simultaneous multi-head blanking and integrated bevel cutting
5. Post-treatment: Slag removal, deburring & polishing, leveling and part marking
6. Packaging & Delivery: Bulk shipment via full-truck or LTL logistics