Production
We process 20+ engineering alloys across 7 material families, sourced domestically within China’s industrial supply chain for competitive pricing and flexible.
Mechanical Properties (Quenched & Tempered per ASTM A193):
Heat Treatment Window:
Applications: Wind turbine tower bolts (20M+ cycle fatigue), EV motor mounts, heavy machinery structural fasteners
Mechanical Properties (Q+T):
Applications: Battery pack frames, automotive chassis (non-critical)
Corrosion Performance Comparison (ASTM B117 Salt Spray)
Material | Composition (Cr-Ni-Mo) | PREN* | Salt Spray (hrs) | Max Service Temp |
304 | 18-8-0 | 18 | 500-800 | 400°C |
316L | 17-12-2.5 | 24 | 1,200-1,500 | 600°C |
Duplex 2205 | 22-5-3 | 35 | 2,000-2,500 | 300°C |
Inconel 625 | 21-61-9 (Ni-Cr-Mo) | N/A | 3,000 | 1,090°C |
*PREN = Pitting Resistance Equivalent Number: %Cr + 3.3×%Mo + 16×%N (higher = better chloride resistance)
2.1 316L Stainless Steel (Marine-Grade Standard)
Chemical Composition (ASTM A193):
C ≤0.03% | Cr: 16-18% | Ni: 10-14% | Mo: 2-3% | Mn ≤2% | Si ≤1%
Why 316L vs. 316: Low carbon (<0.03%) prevents sensitization (carbide precipitation at grain boundaries during welding/heat exposure)
Mechanical Properties (Solution Annealed per ASTM A240):
Corrosion Mechanisms Explained:
Applications: Offshore wind fasteners, marine hardware, EV battery packs (10-15 year coastal exposure)
Processing: Cold heading (50-300 pcs/min), passivation (ASTM A967 citric acid), electropolishing (Ra 0.1-0.3μm)
2.2 Duplex 2205 (Austenite + Ferrite Structure)
Key Advantage: 2× yield strength of 316L (450-550 MPa vs. 205-310 MPa) at comparable corrosion resistance
Mechanical Properties (ASTM A182 F51):
Stress Corrosion Cracking (SCC) Resistance: Superior to 300-series austenitic (critical for marine platforms under tensile stress)
Applications: Offshore platforms, desalination plants, chemical tankers
7075-T6 vs. 6061-T6 Performance Comparison
Property | 7075-T6 (Zn-Mg-Cu) | 6061-T6 (Mg-Si) | Test Standard |
Tensile Strength | 570 MPa | 310 MPa | ASTM E8 / ISO 6892-1 |
Yield Strength | 505 MPa | 275 MPa | 0.2% offset method |
Density | 2.81 g/cm³ | 2.70 g/cm³ | Both 64-65% lighter than steel |
Machinability | Good (75% rating) | Excellent (90% rating) |
|
Corrosion Resistance | Fair (requires anodizing) | Good (natural oxide) |
|
Anodizing Performance (Type III Hard Anodize per MIL-A-8625):
Max Torque Limitation: 30-50 Nm (M10 size) – suitable for decorative/moderate loads only
Ti-6Al-4V (Grade 5 per ASTM B348)
Chemical Composition:
Al: 5.5-6.75% | V: 3.5-4.5% | Fe ≤0.30% | O ≤0.20% | C ≤0.08%
N ≤0.05% | H ≤0.015% | Ti: Balance (~90%)
Mechanical Properties (Annealed per AMS 4928):
Temperature Performance:
Corrosion Immunity: Passive TiO₂ layer (2-7 nm, self-healing) → infinite salt spray resistance
Processing Challenges Solved:
Weight Savings Example: M8×25mm bolt: Ti 4.5g vs. Steel 8.0g = 540g savings per 40-bolt engine kit
Applications: Racing engine bays, aerospace fasteners, premium builds
Inconel 718 (Age-Hardenable Ni-Cr per AMS 5662)
Chemical Composition:
Ni: 50-55% | Cr: 17-21% | Fe: ~18% | Nb+Ta: 4.75-5.50% | Mo: 2.80-3.30%
Ti: 0.65-1.15% | Al: 0.20-0.80% | Co ≤1% | C ≤0.08%
Mechanical Properties (Solution + Aged per ASTM B637):
High-Temperature Strength Retention:
Temp (°C) | Inconel 718 Tensile | 42CrMo4 Tensile | Advantage
20 | 1,350 MPa | 1,100 MPa | Baseline
400 | 1,200 MPa | 600 MPa | +100%
650 | 950 MPa | 180 MPa | +428%
Applications: Turbo mounting bolts (800-1,000°C exhaust gas), jet engines, industrial gas turbines
Stock Availability: Inconel 718 bar stock (Ø8-50mm) maintained for 1-2 week rapid prototyping (vs. 4-6 week procurement)
Processing: 15-30 m/min speeds (vs. 200+ for aluminum), ceramic/fresh carbide tools, 80-120 bar coolant
Our Material | ASTM | EN | GB (China) | JIS | Application |
42CrMo4 | A193 Grade B7 | EN 10083-3 | GB 42CrMo | SCM440 | Wind turbine, industrial |
316L SS | A193 Grade B8M Class 2 | EN 1.4404 | GB 022Cr17Ni12Mo2 | SUS316L | Marine, offshore |
Ti-6Al-4V | B348 Grade 5 | EN 3.7165 | GB TC4 | TAB6400 | Aerospace, racing |
7075-T6 Al | B211 | EN AW-7075 | GB 7A04 | A7075 | Lightweight structural |
Inconel 718 | B637 UNS N07718 | EN 2.4668 | GH4169 | NCF718 | Extreme temperature |
Material Verification:
Test Frequency: 2 tensile samples + 5 hardness measurements per production batch
Check more successful parts we did before for our heavy clients.
Review what technology we can do in our factory.
Contact Us To Realize Your Project!
+86 130 3230 2505
sales@keyfixpro.com
No MOQ. Small batches are acceptable.
We work with STEP, IGES, Parasolid, STL, and native CAD files (SolidWorks, Inventor, CATIA). 2D drawings (PDF, DWG) also accepted.
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Absolutely. Our DFM review identifies cost-saving opportunities while maintaining your design intent and leveraging our STS T52 capabilities.
Complete package includes: material composition analysis, tensile test results, 3D scan reports, surface roughness measurements, dimensional verification, and photographic documentation.
We perform 100% full inspection using automated optical sorting—every single part is verified, not just sample batches. Combined with 3D scanning and ultrasonic defect detection, we guarantee zero-defect delivery.