Q345E无缝钢管，Q表示该材料的成熟度，后者345表示该材料的降服值(345)。并且，随着材料的厚度增加投降值减少。
对Q345无缝钢管分类
Q345A、Q345C、Q345D、Q345E。这是等级的不同，说明了冲击的温度不同和冲击的不同。
Q345A的等级不影响;Q345B等级是20度常温影响;Q345C的等级是0度的影响;Q345D等级是-20度的影响;Q345E的等级是-40度的影响。冲击值也根据冲击温度而不同。在板中是低合金。在低合金材料中，这个材料是普遍的。没有Q345的缝隙的钢管的过去的东西被称作:没有16Mn接续的钢管。Q345无缝钢管的外部执行规格为GB709，内部执行规格为GB / T1591-94。
Q345无缝管属低合金系列----低合金高强度结构钢(GB/T1591-1994)。Q345A、B、C、D、E是此类钢的代表牌号，其中A、B级钢通常称16Mn，此种材质为最普通;普通
Q345无缝管此类钢同碳素结构钢比。具有强度高、综合性能好、使用寿命长、应用范围广、比较经济等优点。该钢多轧制成板材、型材、无缝钢管等，被广泛用于桥梁、船舶、锅炉、车辆及重要建筑结构中。
Q345E seamless steel pipe, q is the maturity of the material, the latter 345 is the surrender value of the material (345). Moreover, with the increase of material thickness, the surrender value decreases.
Classification of Q345 seamless steel pipe
Q345A、Q345C、Q345D、Q345E。 This is the difference of grades, which indicates the difference of temperature and impact.
The grade of Q345A has no influence; the grade of Q345B is the influence of 20 ℃ at room temperature; the grade of Q345C is the influence of 0 degree; the grade of Q345D is the influence of - 20 degree; the grade of Q345E is the influence of - 40 degree. The impact value also varies according to the impact temperature. In the plate is a low alloy. This material is common in low alloy materials. The past of steel pipe without Q345 gap is called: steel pipe without 16Mn connection. The external execution specification of Q345 seamless steel pipe is gb709, and the internal execution specification is GB / t1591-94.
Q345 seamless pipe belongs to low alloy high strength structural steel (GB / t1591-1994). Q345A, B, C, D and E are the representative grades of this kind of steel, of which grade A and B are usually called 16Mn, which is the most common material; Q represents the yield of this material, and the latter 345 refers to the yield value of this material, which is about 345. (similar to the naming method of Q235) and the yield value will decrease with the increase of material thickness.
Q345 seamless pipe this kind of steel and carbon structural steel ratio. It has the advantages of high strength, good comprehensive performance, long service life, wide application range and comparative economy. It is widely used in bridges, ships, boilers, vehicles and important building structures.
