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 30671 Thermoset plastic coatings for buried steel pipes
DIN 30670 Polyethylene coatings of steel pipes and fittings-requirements and testing
DIN 28500 Cast iron pressure pipes and special casting -technical conditions of delivery
DIN 28181 Welded steel tubes for tubularheat exchangers -dimensions,dimensional deviations and materials
DIN 28180 Seamless steeltubes for tubular heat exchangers -dimensions,dimensional deviations and materials
DIN 28179 Steel U-tubes for tubular heat exchangers -technical delivery conditions
DIN 19530-2 Steel socket pipes and fittings for sewers -technical delivery conditions
DIN 19530-1 Steel socket pipes and fittings for sewers-dimensions
DIN 19522-2 Cas iron spigot (SML)drainpipes and fittings -technical delivery conditions
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