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国营华安机械厂职工发挥了敢想、敢干的共产主义风格,用热挤压法制成世界上第一根球墨铸铁无缝铁管(直径54公厘,厚6公厘),抗拉强度一般在70公斤/公厘~2左右,延伸率2~4%;水压试验加压到300公斤/公分~2未破裂;张口试验0.65%;压扁
The employees of state-owned Huaan Machinery Factory played a bold and daring communism style and made the world’s first ductile iron seamless pipe (diameter 54mm, thickness 6mm) by hot extrusion method with general tensile strength In the 70 kg / mm ~ 2 or so, the elongation rate of 2 to 4%; hydrostatic test pressure to 300 kg / cm ~ 2 unbroken; mouth test 0.65%; crushed