AISC、EN、GB 三大体系的图纸标注习惯不同，看得懂符号，验货沟通少一半误会。AISC, EN and GB drawings annotate differently. Reading the symbols halves the misunderstandings.
海外采购商拿到加工图时最常见的困惑，是不同规范体系的标注习惯差异。三套主要体系速记：
美标 AISC：型钢用「深度×重量」标注，如 W24×94；螺栓孔标注习惯用英制，验货时注意换算。
欧标 EN：型钢用截面代号，如 HEB300、IPE400；焊缝符号遵循 ISO 2553，与 AWS A2.4 的箭头方向含义不同，这是误会重灾区。
国标 GB：Q355B 等牌号对应欧标 S355，但两者在冲击韧性试验温度上有差异，不能直接划等号。
雄岚的出口图纸默认按目的国习惯标注，并在首页附符号对照表。如果您拿到别家图纸看不懂，也欢迎发来，我们帮忙解读。
The most common confusion buyers face with shop drawings is different annotation conventions across code systems. Quick guide to the big three:
AISC (US): sections noted as depth×weight, e.g. W24×94; bolt holes in imperial units — convert carefully during inspection.
EN (Europe): sections by designation, e.g. HEB300, IPE400; weld symbols follow ISO 2553, whose arrow conventions differ from AWS A2.4 — a classic source of misunderstanding.
GB (China): grades like Q355B roughly correspond to S355, but impact-test temperatures differ, so don't equate them directly.
Xionglan export drawings follow the destination country's conventions by default and include a symbol key on the cover sheet. If a drawing from another supplier has you puzzled, send it over — we're happy to help interpret.
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