Q345A的等級不影響;Q345B等級是20度常溫影響;Q345C的等級是0度的影響;Q345D等級是-20度的影響;Q345E的等級是-40度的影響。沖擊值也根據沖擊溫度而不同。在板中是低合金。在低合金材料中，這個材料是普遍的。沒有Q345的縫隙的鋼管的過去的東西被稱作:沒有16Mn接續的鋼管。Q345無縫鋼管的外部執行規格為GB709，內部執行規格為GB / T1591-94。
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.