GB/T1591-2018低合金高强度结构钢2019.2.1实施。GB/T1591-2018修改了钢材力学性能值及厚度组距的规定，明确屈服强度为下屈服强度；提高了冲击吸收能量值，明确了冲击试验的取样部位。GB/T1591-2018适用于一般结构和工程用低合金高强度结构钢钢板、钢带、型钢、钢棒等。
GB/T1591-2018参照EN 10025结构钢热轧产品，扩大了标准的适用范围；增加了Q500、Q550、Q620、Q690强度级别，取消了Q295强度级别；jnshiyanji.com；修改了钢材化学成分的规定、加严了对磷、硫等有害元素的控制；增加了钢材碳当量及裂纹敏感系数的计算公式及规定；修改了钢材的交货状态，取消了调质钢的规定；增加了各牌号钢的厚度方向性能要求；规定了低合金高强度结构钢的牌号、尺寸、外形、重量及允许偏差、技术要求、试验方法、检验规则、包装、标志和质量证明书。GB/T2975-2018；GB/T8162-2018；钢力学性能试验；钢产品力学性能试验；
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济南恒瑞金试验机有限公司；山东省力值硬度计量专业委员
（试验机服务中心）（试验机配件供应中心）（特殊夹具定制中心）
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