Forging in China — Complete Sourcing Guide for Global Buyers
Forging is one of the oldest and most reliable metal forming processes. In China, the forging industry has grown into a multibillion dollar sector serving automotive, aerospace, oil and gas, mining, and heavy machinery industries worldwide.
What is Forging?
Forging shapes metal using localized compressive forces. Unlike casting or machining, forging realigns the grain structure of the metal to follow the part's shape, resulting in superior strength and fatigue resistance.
Key Advantage: Forged parts are 15-25% stronger than cast or machined equivalents of the same material, making them essential for safety-critical applications like crankshafts, connecting rods, and pressure vessel fittings.
Types of Forging Available in China
1. Open-Die Forging
Metal is deformed between flat or shaped dies that do not fully enclose the workpiece.
- Part sizes: 1 kg to 300+ tons
- Best for: Large shafts, rings, flanges, blocks
- Tolerances: +/- 2-5mm
- Leading clusters: Yantai (Shandong), Luoyang (Henan), Deyang (Sichuan)
2. Closed-Die Forging
Metal is pressed into a die cavity forming the final shape. Flash created at the parting line is trimmed off.
- Part sizes: 0.1 kg to 2,500 kg
- Best for: Connecting rods, gears, flanges, valve bodies
- Tolerances: +/- 0.5-2mm
- Leading clusters: Cangzhou (Hebei), Ningbo (Zhejiang), Wenzhou (Zhejiang)
3. Seamless Ring Rolling
A punched preform is rolled into a seamless ring. Grain structure follows the circumference for exceptional strength.
- Ring sizes: 200mm to 8,000mm diameter
- Best for: Bearing races, flanges, gear blanks, wind turbine rings
Materials Commonly Forged in China
| Material | Common Grades | Typical Applications |
|---|
| Carbon Steel | 20#, 45#, AISI 1045 | General shafts, gears, flanges |
| Alloy Steel | 40Cr, 42CrMo, 4140, 4340 | High-strength automotive and machinery parts |
| Stainless Steel | 304, 316, 17-4PH | Food processing, chemical, marine |
| Aluminum | 6061, 7075, 6082 | Aerospace brackets, suspension |
| Titanium | Ti-6Al-4V, Grade 2, Grade 5 | Aerospace structural parts, implants |
| Inconel / Nickel Alloys | Inconel 625, 718, Monel 400 | Oil and gas, chemical processing |
Quality Standards
- ISO 9001:2015 (all tier-1 suppliers)
- IATF 16949 (automotive OEM)
- API 6A / 20A (oil and gas)
- ASME BPVC (pressure vessels)
- EN 10204 3.1/3.2 (European material cert)
Top Forging Cities
- Yantai (Shandong): China's forging capital. Hydraulic presses up to 40,000 tons.
- Cangzhou (Hebei): Pipe fittings, flanges, valve forgings.
- Ningbo (Zhejiang): Precision closed-die forging for automotive.
- Luoyang (Henan): Heavy open-die forging.
- Deyang (Sichuan): Nuclear and hydropower turbine shafts.
Sourcing Checklist
- Confirm press tonnage matches your part size
- Ultrasonic testing (UT) for critical forgings
- Heat treatment condition: normalized, quenched and tempered, or annealed
- Mill test certificates per EN 10204 3.1
- Heavy-lift logistics for large forgings
- First-article inspection before mass production