China National Standards

China Surface quality classes GB Standards List

  •  China "Surface quality classes" GB Standards List:
    • Standard  Code Standard Title Standard Class Order
    GB/T 28300-2012 Surface quality classes for hot-rolled bars and rods technical delivery conditions
    热轧棒材和盘条表面质量等级交货技术条件    		 China National Standards
    Surface quality classes
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