焊管框架协议中国石化长城能源化工(宁夏)有限公司镀锌焊接钢管\Φ114.3×4mm Q235B+Zn GB/T 3091镀锌焊接钢管\Φ33.7×3.2mm Q235B+Zn GB/T 3091普通焊接钢管\Φ26.9×2.8mm Q235B GB/T 3091普通焊接钢管\Φ33.7×3.2mm Q235B GB/T 3091普通焊接钢管\Φ42.4×3.5mm Q235B GB/T 3091普通焊接钢管\Φ48.3×3.5mm Q235B GB/T 3091普通焊接钢管\Φ60.3×3.8mm Q235B GB/T 3091镀锌焊接钢管\Φ33.7×3.2mm Q235B+Zn GB/T 3091镀锌焊接钢管\Φ42.4×3.5mm Q235B+Zn GB/T 3091镀锌焊接钢管\Φ48.3×3.5mm Q235B+Zn GB/T 3091镀锌焊接钢管\Φ60.3×3.8mm Q235B+Zn GB/T 3091镀锌焊接钢管\Φ76.1×4mm Q235B+Zn GB/T 3091镀锌焊接钢管\Φ88.9×4mm Q235B+Zn GB/T 3091镀锌焊接钢管\Φ26.9×2.8mm Q235B+Zn GB/T 3091镀锌焊接钢管\Φ21.3×2.8mm Q235B+Zn GB/T 3091镀锌焊接钢管\Φ33.7×3.5mm Q235B+Zn GB/T 3091镀锌焊接钢管\Φ33.7×3.3mm Q235B+Zn GB/T 3091
2025-12-02