本文目录一览:
- 1、Q345A是什么材料
- 2、Q345A是什么材质
- 3、Q345A的概述
Q345A是什么材料
Q345A,是一种钢材,强度好,但是性能差。它是低合金钢,广泛应用于桥梁、车辆、船舶、建筑、压力容器等。
①由Q+数字+质量等级符号+脱氧 *** 符号组成。它的钢号冠以“Q”,代表钢材的屈服点,后面的数字表示屈服点数值,单位是MPa例如Q345表示屈服点(σs)为345MPa的碳素结构钢。
②必要时钢号后面可标出表示质量等级和脱氧 *** 的符号。质量等级符号分别为A、B、C、D。脱氧 *** 符号:F表示沸腾钢;b表示半镇静钢:Z表示镇静钢;TZ表示特殊镇静钢,镇静钢可不标符号,即Z和TZ都可不标。例如Q235-AF表示A级沸腾钢。
详见百科:
Q345A是什么材质
Q345是对一种钢材材质笼统的说法,Q345B是其中一个质量等级产品。具体差别如下:
Q345是一种钢材的材质。它是低碳合金钢(c0。2%),综合性能好,低温性能好,冷冲压性能,焊接性能和可切削性能好,广泛应用于桥梁、车辆、船舶、建筑、压力容器等。
Q代表的是这种材质的屈服,后面的345,就是指这种材质的屈服值,在345MPa左右。并会随着材质的厚度的增加而使其屈服值减小。
扩展资料:
钢材中除主要化学成分Fe铁以外,还含有少量的碳(C)、硅(Si)、锰(Mn)、磷(P)、硫(S)、氧(0)、氮(N)、钛(Ti)、钒(V)等元素,这些元素虽含量很少,但对钢材性能的影响很大。
碳是决定钢材性能的最重要元素,它影响到钢材的强度、塑性、韧性等机械力学性能。当钢中含碳量在0。8%以下时,随着含碳量的增加,钢的强度和硬度提高,塑性和韧性下降。
但当含碳量大于1。0%时,随含碳量增加,钢的强度反而下降。一般工程用碳素钢均为低碳钢,即含碳小于0。25%,工程用低合金钢含碳小于0。52%。
钢中有益元素有锰、硅、钒、钛等,控制掺入量可冶炼成低合金钢。钢中主要的有害元素有硫、磷及氧,要特别注意控制其含量。磷是钢中很有害的元素之一,主要溶于铁素体起强化作用。
Q345A的概述
Q345A钢材与Q345B,C,D,E钢相比而言,低温冲冲击的试验温度高,性能差,含有害物资P,S量比Q345B,C,D,E要高。
市场价格比Q345B,C,D,E要低Q345 是一种钢材的材质。它是低合金钢,广泛应用于桥梁、车辆、船舶、建筑、压力容器等。Q代表的是这种材质的屈服,后面的345,就是指这种材质的屈服值,在345MPa左右。并会随着材质的厚度的增加而使其屈服值减小。
参考标准:GB/T1591-2008 《低合金高强度结构钢》
注:Q345最新标准GB/T1591-2008 相对于老标准,最明显的一个变化就是Mn元素含量的变化,从原来的1.0-1.60更正为≤1.70,取消了最小值的限定。
随着现代工业的发现,科技的不断进步,各种微量元素在钢板中的应用也更加广泛,Mn含量不再是影响钢材强度和机械性能的唯一因素。所以中华人民共和国国家质量监督检验检疫总局和中国国家标准化管理委员会联合发布实施的低合金高强度结构钢标准,取消Mn含量区间的限定,只规定更大值。
对于Q345钢材的检测,一方面是钢材的元素含量是否达到国标要求,最重要的一方面是通过专业机构检测钢材的机械性能(屈服强度、拉伸试验)是否达到标准。
q345a
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