In Investment Casting (Lost Wax Casting), selecting and controlling materials according to international standards determines 70–80% of the final product quality. Minor deviations in chemical composition or mechanical properties can lead to hot tears, inclusions, reduced service life, or failure to meet export certifications (ABS, DNV, FDA, PED).
At CDL LOST WAX CASTING JOINT STOCK COMPANY (Dong Nai) – an ISO 9001:2015 certified facility (Certificate No. 9199302839085-QMS, valid until 2028) – we strictly implement ASTM (USA) and EN (Europe) standards for all stainless steel (304, 316, 316L, Duplex) and alloy steel (4140, 4340) heats. With 100% spectrometer testing and full COA (Certificate of Analysis), our material compliance rate stands at 99.5%, empowering global partners like THACO, Yamaha, Hyundai, and Ford to export seamlessly to the EU, USA, and Japan.
1. ASTM A351, A743, and A744 – Standards for Cast Stainless Steel
These three standards form the core of cast stainless steel specifications:
- ASTM A351: Covers Austenitic steel castings for pressure-containing parts.
- CF8 = Cast 304 Stainless Steel.
- CF8M = Cast 316 Stainless Steel.
- CF3M = Cast 316L Stainless Steel (Carbon $\leq$ 0.03%).
- ASTM A743: Focuses on corrosion-resistant iron-chromium and iron-chromium-nickel alloys for general applications.
- ASTM A744: Specifically for severe corrosive service (e.g., CK3MCuN or Super Duplex). Requires strict Ferrite control (35–55%) and a PREN $\geq$ 40.
At CDL: Every heat is verified via ASTM A751 (Spectrometric Analysis) before pouring to ensure elements remain within $\pm$0.01% of ASTM limits.
2. ASTM A216 and A217 – Standards for Carbon and Alloy Steel Castings
- ASTM A216: For Carbon Steel castings suitable for fusion welding (Grades WCB, WCC).
- WCB: $C \leq 0.30\%$, $Mn$ 0.60–0.90%, Tensile Strength $\geq$ 485 MPa.
- ASTM A217: For Steel Alloy castings (Cr-Mo, Ni-Cr-Mo) intended for high-temperature and high-pressure service.
- Equivalent to 4140/4340: Requires specific post-cast heat treatment (Normalize + Quench & Temper).
3. EN 10213 – European Standard for Steel and Stainless Steel Castings
EN 10213 (Steel Castings for Pressure Purposes) is the European benchmark replacing older BS 3100 and DIN 17245 standards:
- Part 2: Carbon steels (e.g., GP240GH).
- Part 4: Austenitic stainless steels (e.g., GX5CrNi19-10 for 304).
- Part 5: Duplex and Super Duplex (e.g., GX2CrNiMoN22-5-3 for 2205).
At CDL: For EU projects requiring PED 2014/68/EU, we provide full Material Test Certificates (MTC) according to EN 10204 Type 3.1.
4. Comparative Matrix: ASTM vs. EN Standards
| Material | Primary Standard | Cr (%) | Ni (%) | Mo (%) | Tensile (MPa) | Yield (MPa) | PREN |
| SS 304 (CF8) | ASTM A351 | 18–21 | 8–11 | – | $\geq$ 485 | $\geq$ 205 | 18–20 |
| SS 316 (CF8M) | ASTM A351 | 16–18 | 10–14 | 2–3 | $\geq$ 485 | $\geq$ 205 | 24–26 |
| Duplex 2205 | ASTM A744 | 21–23 | 4.5–6.5 | 2.5–3.5 | $\geq$ 620 | $\geq$ 450 | 35 |
| Carbon Steel WCB | ASTM A216 | – | – | – | $\geq$ 485 | $\geq$ 250 | – |
| Alloy Steel 4340 | ASTM A217 | 0.7–0.9 | 1.65–2.0 | 0.2–0.3 | $\geq$ 1050 | $\geq$ 850 | – |
5. Quality Control Workflow at CDL
- Raw Material Inbound: Verifying supplier COA + Spectrometer verification.
- Pre-Pour Inspection: 100% chemical verification per ASTM A751.
- Post-Cast Testing: Sampling for Tensile, Charpy Impact, and Hardness tests.
- Heat Treatment: Executed strictly according to ASTM A217 or EN 10213 thermal cycles.
- Certification: Issuing MTC Type 3.1 (or 3.2 upon request) ensuring full traceability from the furnace to the finished part.
6. Proven Case Studies
- Case 1 – Food Industry (Yamaha): Utilized ASTM A351 CF8M. Spectrometer verification ensured the Mo content was exactly 2.1%, achieving superior corrosion resistance. Certified FDA-compliant.
- Case 2 – Marine Engineering (THACO Marine): Cast 4340 Steel per ASTM A217. Achieved 1,150 MPa tensile strength after 580°C tempering, meeting ABS/DNV requirements.
- Case 3 – Offshore Oil & Gas: Produced Super Duplex per EN 10213-5. Achieved PREN 42 and 48% Ferrite, successfully resisting 5% $H_2S$ exposure at 150°C.
Conclusion
Adhering to ASTM A351/A216 and EN 10213 is the cornerstone of high-quality Investment Casting. At Lostwaxcasting CDL, our modern spectrometry and ISO 9001:2015 processes guarantee that every casting meets international material specifications, reducing risk and optimizing long-term costs.
