مقاطع توخالی دایره ای برای انقباض YuantaiDerun
Tianjin Yuantai Derun is a famous ERW steel pipe factory in China ERW Circular Hollow Section standard specification: out diameter Wall thickness Length Inch mm mm meter 1/2 21.3mm 0.6mm-3.0mm 0.3m-12m 3/4 26.9mm 0.6mm-3.0mm 0.3m-12m 1 33.4...