| Patents for C21C 3 - Manufacture of wrought-iron or wrought-steel (27) |
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| 05/01/2013 | CN102337370B Device and method for smelting industrial pure iron |
| 01/09/2013 | CN102352421B Process for smelting industrial pure iron with converter waste slag ball iron |
| 03/21/2012 | CN102382925A Manufacturing method of ultrapurity armco iron |
| 02/15/2012 | CN102352421A Process for smelting industrial pure iron with converter waste slag ball iron |
| 02/01/2012 | CN102337370A Device and method for smelting industrial pure iron |
| 09/23/2009 | CN101538634A Smelting process and device of pure iron |
| 12/12/2007 | CN100354562C High alloy steel seamless steel pipe and production method thereof |
| 07/26/2006 | CN1807955A High alloy steel seamless steel pipe and production method thereof |
| 07/20/2005 | CN1643167A High tensile steel excellent in high temperature strength and method for production thereof |
| 01/05/2005 | EP1493828A1 High tensile steel excellent in high temperature strength and method for production thereof |
| 10/23/2003 | WO2003087414A1 High tensile steel excellent in high temperature strength and method for production thereof |
| 03/19/2003 | CN1403596A Pure iron smelting method |
| 10/23/2002 | EP0755736B1 Improvements in metallurgical conversion |
| 06/11/2002 | US6402807 Method for wet smelting of iron family metal bearing ores |
| 12/15/1999 | CN1047336C Method and device for preparation of semi-product in metallurgical conversion |
| 10/06/1998 | US5817164 Method and apparatus for making feedstock for steel making |
| 07/15/1998 | EP0755736A4 Improvements in metallurgical conversion |
| 04/29/1998 | CN2280102Y Coal heat stove for swaging |
| 01/29/1997 | EP0755736A1 Improvements in metallurgical conversion |
| 01/08/1997 | CN1139889A Improvments in metallurgical conversion |
| 09/08/1995 | WO1995023660A1 Improvements in metallurgical conversion |
| 09/08/1995 | CA2183262A1 Improvements in metallurgical conversion |
| 01/05/1994 | CN1023410C Production of ingot iron with solid decarbonising pig iron and remelting in electric furnace |
| 07/10/1991 | CN1052900A Production of ingot iron with solid decarbonising pig iron adn remelting in electric furnace |
| 03/13/1991 | CN1011970B Method for using chinese alpine rush as raw material to make nitrocellulose |
| 03/04/1987 | CN85106196A Utilize chinese alpine rush for making nitrocellulose |
| 09/24/1986 | CN85100672A Steel for thick walled hyperpressure containers and its manufacturing technology |