Along with the years of entrepreneurial journey of Zhongyuan people, she gradually formed her own spiritual pillar and behavioral norms. In the silent inheritance, she guided Zhongyuan Company towards a more brilliant tomorrow.
DIN 4922-3 Steel filter pipes for drilled wells -flanged connection,NW 500 to NW 1000(Nominal Diameter 500 to 1000)
DIN 4922-2 Steel filter pipes for drilled wells with screwed connection DN 100 to DN 500
DIN 17204 Seamless circular tubes made from steels for quenching and tempering-technical delivery conditions
DIN 17179 Seamless circular fine grain steel tubes subject to special requirements -technical delivery conditions
DIN 17178 Welded circular fine grain steel tubes subject to special requirements -technical delivery conditions
DIN 17177 Electric pressure-welded steel tubes for elevated temperatures -technical conditions of delivery
DIN 17176 Seamless circular steel tubes for hydrogen service at elevated temperatures and pressures -technical delivery conditions
DIN 17175 Seamless tubes of heat-resistant steels -technical conditions of delivery
DIN 17174 Welded circular tubes made from steel with low temperature toughness-technical delivery conditions
DIN 17173 Seamless circular tubes made from steels with low temperature toughness -technical delivery conditions
DIN 17124 Seamless circular fine grain steel tubes for structural steel work -technical delivery conditions
DIN 17121 Seamless circular steel tubes for structural steel work -technical delivery conditions
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