Break the limit! Haili Machinery successfully tested low temperature ductile iron, -60℃ performance is still stable
I. Headline
Zhangzhou Haili Machinery Manufacturing Co., Ltd. announces:
• QT400-18AL (-40 °C grade)
• QT350-22AL (-60 °C grade)
The two ultra-low-temperature ductile iron grades have completed process solidification and entered mass production, filling Fujian Province’s gap in ‑60 °C ductile-iron castings.
II. Verified Performance
| Grade | Minimum Service Temp. | Impact Toughness KV2 | Elongation A | Tensile Strength Rm | Standard |
|---|
| QT400-18AL | ‑40 °C | ≥12 J | ≥18 % | ≥400 MPa | GB/T 1348-2022 plus EN 1563 low-temperature clause |
| QT350-22AL | ‑60 °C | ≥10 J | ≥22 % | ≥350 MPa | Same as above |
Low-temperature type-test report No.: FJQT-LT2025-07028
Testing body: Fujian Special Equipment Inspection & Research Institute
III. Technical Moat
Patented Processes
• Invention patent “Low-Temperature Ductile Iron Production Process” (CN116676524A): Ni-Mo-Cu micro-alloying + stepped austempering, boosting ‑50 °C impact energy by 30 %.
• Utility model “Temperature Control Device for Low-Temperature Ductile Iron Production” (CN220765827U): ±2 °C precise control, ensuring uniform properties in heavy sections.
Dedicated Low-Temperature Line
• 15 t medium-frequency furnaces ×2, 60 m regenerative annealing furnace
• On-line spectrometer / UT / ‑80 °C rapid-impact laboratory
International Certifications
• ISO 9001 / IATF 16949
• DNV-GL, BV, ABS, LR factory approvals
IV. Application Fields
• Arctic wind-turbine hubs & gearboxes
• LNG/LPG cryogenic valves & pipe fittings
• High-speed rail bogies & brake systems
• Subsea Xmas trees & pipeline supports
V. Contact Us📞 Sales Hotline: +86-596-8353060
📧 E-mail:
sales@cn-haili.com📍 Address: Nanban Industrial Park, Wu’an Town, Changtai District, Zhangzhou, Fujian, China
🌐 Website:
www.cn-haili.com Zhangzhou Haili Machinery Manufacturing Co., Ltd.
Technology Center • Cryogenic Materials Division
Address：Nanban, Wuan Town, Changtai District, Zhangzhou City.
Phone：86-596-8353060 
Fax：86-596-8328220 
Email：sales@cn-haili.com
