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
