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一、Q690D钢板介绍：
1、 Introduction to q690d steel plate:
Q690D归于高强度焊接结构钢。其间Q代表屈服强度，690代表屈服强度值，D代表钢板的等级；常见的钢板质量等级分别为A、B、C、D、E。D级钢板的冲击为-20°C。
Q690d is a high strength welded structural steel. Where Q represents the yield strength, 690 represents the yield strength value, and D represents the grade of steel plate; The common quality grades of steel plates are a, B, C, D and E. The impact of grade D steel plate is - 20 ° C.
二、Q690D钢板交货情况：
2、 Delivery status of q690d steel plate:
Q690D钢板的交货情况热处理办法为TMCP+回火，调质 。
The delivery status and heat treatment method of q690d steel plate are TMCP + tempering and quenching and tempering.
三、Q690D钢板实行标准：
3、 Executive standard of q690d steel plate:
Q690D钢板实行现有标准为GB/T16270-2009。
The existing standard of q690d steel plate is GB / t16270-2009.
四、Q690D钢板靠近商标：
4、 Approaching grade of q690d steel plate:
Q690D钢板一般与国表里相似的商标有WQ690D、S690Q、武钢HG785D。
The grades of q690d steel plate are generally similar to those at home and abroad, including wq690d, s690q and WISCO hg785d.
五、Q690D钢板化学成分：
5、 Chemical composition of q690d steel plate:
成分 C Si Mn P S Ni Cr Mo Nb Ti B
Composition C Si Mn p s Ni Cr Mo NB Ti B
Q690D ≤0.18 ≤0.60 ≤2.0 ≤0.030 ≤0.025 ≤0.80 ≤1.00 ≤0.30 ≤0.11 ≤0.020 ≤0.004
碳当量计算公式：CEV=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15
Carbon equivalent calculation formula: CEV = C + Mn / 6 + (Cr + Mo + V) / 5 + (Ni + Cu) / 15
六、Q690D钢板运用：
6、 Application of q690d steel plate:
Q690D可称为屈服强度690Mpa的耐低温高强钢，具有较高的屈服强度和抗拉强度，广泛运用于煤矿机械、工程机械，如液压支架、港口起重机、平板运输车。
Q690d can be called low temperature resistant high-strength steel with yield strength of 690mpa. It has high yield strength and tensile strength. It is widely used in coal mining machinery and engineering machinery, such as hydraulic support, port crane and flat transport vehicle.
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