Marine at Offshore Forgings

1. Propeller at Intermediate Shaft

• Laki ng window: Ø 80 – 2 000 mm × L ≤ 23 m; timbang ng yunit ≤ 50 t
• Mga Grade: C45, 50Mn, 25Cr2Ni4MoV, 34CrNiMo6, 42CrMo4, SUS316L, 17-4PH – pinili para sa torque, fatigue at seawater resistance
• Proseso: EF+LF+VD (ESR opsyonal) → 30 t hammer/12 000 t press → upset, stretch, 360° rotary forging → normalize + Q&T → straighten ≤ 1 mm/m
• Mga Katangian: through-yield 350 – 900 MPa, Charpy ≥ 45 J @ –40 °C, forging ratio ≥ 3.5, UT SEP 1921 Class C/c
• Mga Finish: rough/finish machined, ground, chrome plated 0.1 mm, HVOF o stainless cladding para sa 30 taong buhay

2. Mga Stock at Pin ng Rudder

• Solid o guwang, tapered o cylindrical, flange integral o welded
• Duplex 2205/2507 na opsyon para sa 1 000 h salt-spray environment; ferrite 30-60 %, –46 °C epekto 45 J
• Ang induction ay nagpapatigas ng mga bearing neck sa 55 HRC, lalim na 4-6 mm, compressive residual –180 MPa

3. Mga Bahagi ng Anchor at Mooring

• Open-die forged crown, shank, flukes at chain-wheels (gipsy) hanggang 25 t
• Micro-alloy steels (20Mn2, 60Mn) air-cooled hanggang 28 HRC – weld-repairable sa deck
• Proof load test 1.5 × SWL, certified shackle compatibility

4. Deck at Offshore na Makinarya

• Mga crane king-post, winch drum, cable sheaves, hatch-cover hinges – lahat ay huwad na walang tahi, walang cast weld seams
• Ring-rolled shell para sa capstan drums Ø ≤ 4 m, haba ≤ 3 m sa isang piraso

5. Halaga ng Post-Forge

• CNC 5-face milling, deep-hole drill Ø 1–40 mm, key-way at spline broach
• Ibabaw: shot-blast SA 2.5, hot-dip Zn 40-120 µm, rubber-lining, FRP wrap para sa cathodic protection
• NDT: 100 % UT + MT, bore-scope, hardness mapping, dimensional na laser tracker
• Paper trail: EN 10204 3.2, testigo ng ABS/DNV surveyor, ulat ng pagkapagod at torsional test

6. Bilis at Kakayahang umangkop

• Prototype: 10-15 araw (magaspang), 15-20 araw (finish machined)
• Serye: 4-6 na linggo; blanket order at ship-yard consignment stock suportado
• I-export: anti-sea-water packing; DDP global, 7-araw na air freight para sa emergency repair