钢格板的原材料

RAW MATERIAL OF STEEL GRATING

我们讨论钢格板的原材料, 前提是钢，钢的格栅板, 所以非金属的, 有色金属的格板不在本标准的规定范围.

钢格板的原材料就是用什么牌号的钢材,用什么规格的钢材.

YB4001-1991标准是这样规定的:

原材料--扁钢--用钢牌号:Q235-A 其化学成分和力学性能应符合GB700的规定.--扁钢的尺寸及允许偏差应符合表3的规定(表3 扁钢的尺寸及允许偏差 厚度3,5mm 宽度20,25,32,40,45,50,55,65mm 长度6100mm).根据需方的要求,也可提供用其他厚度和宽度尺寸的扁钢生产的钢格板.

扭绞方钢--用钢牌号:Q235-A.F 其力学性能应符合GB700的规定.--扭绞方钢的尺寸及允许偏差:方钢边长为6mm, 允许偏差为±0.4mm.

YB/T4001-1998标准是这样规定的:

材料--负载扁钢--负载扁钢可采用碳素结构钢或不锈钢,其化学成分和力学性能应分别符合GB700-88的Q235-A或GB1220-92的0Cr18Ni9的规定.根据供需双方协议,也可采用其他性能高于上述规定的材料.--扁钢尺寸允许偏差应符合表1的规定--钢格板使用的负载扁钢最小厚度为2mm.

横杆--横杆采用与负载扁钢相同的材质,并符合上述材质标准的规定--横杆的截面积:横杆为扭绞方钢,其截面积不得小于25mm²;横杆为圆钢或扁钢,其截面积不得小于16mm².

包边板--包边板采用与负载扁钢相同的材质,并符合上述材质标准的规定.

YB/T4001.1-2007标准是这样规定的:

材料--承载扁钢--承载扁钢可采用GB/T700的Q235-A或B级钢制造,根据供需双方协议,也可采用其他材料制造.--钢格板使用的承载扁钢可以是热轧扁钢,I型钢,也可以是经过纵剪的热轧或冷轧带钢.

横杆--横杆采用与承载扁钢相同的材质,并应符合有关标准的规定.--横杆的截面积: 横杆为扭绞方钢,圆钢或扁钢,其截面积不得小于20mm².

包边板--包边板采用与承载扁钢相同的材质,并应符合有关标准的规定.

第四次修订的新标准应如何去考虑钢格板原材料的相关规定呢?

首先,新钢种新材料的使用.

随着钢格板产品在不同场合的使用要求不同,钢格板产品也应当与时俱进,紧跟新材料、新应用的需求步阀，把适应不同场合使用要求的材料合理使用上,把新材料用上去,把新钢种用上去,钢格板的新产品,新用途就出来了,把钢格板的承载结构优势和新材料的优越特性相结合,就是新型的结构板材.

比如耐腐蚀性的问题,不能指望Q235材料的钢格板经过热浸锌就能抵御不同介质不同环境的腐蚀,或者指望增加热浸锌的锌层厚度去延长耐腐蚀的年限。科学的态度应是根据使用环境腐蚀介质的特性、浓度、温度梯度、接触频率等腐蚀因素加以收集,进行数据分析,选择可以承受或耐缓的材料来制作钢格板。

又比如荷载强度的问题，不能单靠缩小跨距或是增加板厚来解决荷载需求.承载能力和自重永远是矛盾对立面.选用高强度钢种生产的钢格板,才是最好的解决钢格板荷载强度问题的办法。

所以,钢格板采用GB/T700的Q235-A或B级钢制造的条款要改，由碳素结构钢材料，增加低合金高强度结构钢,焊接结构用耐侯钢,铁素体不锈钢,双相不锈钢及奥氏体不锈钢等耐腐蚀钢种材料 。

第二，07标准对原材料的规定：钢格板使用的承载扁钢可以是热轧扁钢，I型钢，也可以是经过纵剪的热轧或冷轧带钢.由于热轧扁钢生产成本高,尺寸难以控制,不利于钢格板生产的送料自动化,所以新标准不再提及热轧扁钢.

新标准对钢格板原材料的条款将会是

钢格板的原材料是经过纵剪的热轧或冷轧带钢:

采用碳素结构钢,低合金高强度结构钢及焊接结构用耐侯钢材料,其性能最低不得低于Q235-A,并且符合GB/T700,GB/T1591,GB/T4172的要求;

采用铁素体不锈钢,双相不锈钢及奥氏体不锈钢材料,其性能最低不得低于06Cr13Al,并且符合GB/T1220的要求.

We discuss the raw material of the steel grating, the premise is the steel, the steel grating, so the non metal, non-ferrous metal grating is not in the scope of this standard.

Steel grating of the raw material is what brand of steel, with what specifications of steel.

YB4001-1991 standard is so specified:

Raw materials: Steel - steel grades: Q235-A the chemical composition and mechanical properties shall comply with the provisions of GB700. - Flat dimension and allowable deviation shall comply with table 3 of the regulations (Table 3 flat size and allow the thickness deviation 3,5mm width 20,25,32,40,45,50,55,65mm . length 6100mm.) According to the requirements, can also be provided by the steel plate steel production other thickness and width size.

Twisted bar, steel grades: Q235-A.F its mechanical properties should accord with GB700 provisions. Twisted bar dimension and tolerance: square side length of 6mm allowable deviation is ±0.4mm.

YB/T4001-1998 standard is so specified:

Materials -- load flat bar- bearing bar , carbon structural steel or stainless steel can be used, the chemical composition and mechanical properties shall be respectively conform to provisions of GB700-88 Q235-A or GB1220-92 0Cr18Ni9. According to the agreement of both sides of supply and demand, but also the other performance higher than the foregoing materials. Flat bar size allowable deviation shall comply with table 1 the provisions of the steel grating using the load flat bar minimum thickness is 2mm.

Cross bar - cross bar with loading bar the same material, and in accordance with the provisions of the standard material, bar section area cross twisted steel, the sectional area shall not less than 25mm²; bar round steel or flat steel, the cross sectional area shall not less than 16mm².

Banding bar- banding bar  with bearing bar of the same material, provisions and meet the above material standards.

YB/T4001.1-2007 standard is so specified:

Materials -- bearing bar - bearing bar can be used Q235-A or B grade GB/T700 steel manufacturing, according to the supply and demand sides agreement, can also be made of other materials.the bearing bar - steel plate can be used hot rolled flat bar, I bar, can also be after slitting rolled or cold-rolled strip.

Cross bar - cross bar with bearing bar of the same material, and shall comply with the relevant standards provisions. --cross bar -sectional area: cross twisted bar, round bar or flat bar, the sectional area shall not less than 20mm².

Banding bar with bearing bar of the same material, provisions and meet the above material standards.

The fourth revision of the new standards should be how to consider the relevant provisions of the raw materials of steel grating?

First of all, the use of the new type steel of the new material.

With the steel grating products in different occasions the use of different requirements, steel grating products should also keep pace with the times,follow new material, new application demand step valve,to adapt to different occasions using the requirements of material and reasonable use, the new material to use up, the new types of steels used up, steel grating of new products, new uses came out, the combination of the advantages of the bearing structure and the advantages of the new material is a new type of steel structural plate.

Such as resisting the corrosion problem, cannot count on Q235 steel grating after hot-dip galvanized can resist the corrosion of different media in different environments, or expect to increase the thickness of layer of hot-dip galvanizing corrosion resistance extends the life of steel grating. Scientific attitude should be according to the use of environment corrosion media properties, concentration, and temperature gradient, frequency of contact corrosion factors to be collected for data analysis, to be selected to bear or corrosion resistant materials to make steel grating.

So, to change the steel grating using GB/T700 Q235-A or B grade steel manufacturing terms, ade of carbon structural steel material, increase of  high strength low alloy structural steels and atmospheric corrosion resising steels for welded structure, ferritic stainless steel, duplex stainless steel and austenitic stainless steel resistant corrosion steel material.

The new standard for steel grating raw materials will be