热轧圆钢和方钢

钢是铁合金的总称，其碳含量为0.02％至2.04％质量。钢的化学成分可以有很大差异。仅含碳的钢称为碳钢（碳钢）或普通钢。在实际生产中，钢根据应用通常含有不同的合金元素，例如锰。镍，钒等人类在钢铁应用和研究方面有着悠久的历史，但直到19世纪贝叶斯炼钢工艺的发明，钢铁生产成本高昂且效率低下。如今，钢材价格低廉，性能可靠，是世界上使用最多的材料之一。它是建筑业，制造业和人们日常生活中不可或缺的组成部分。可以说，钢铁是现代社会的物质基础。直径d（或边长a）/ mm精密组横截面积/ cmsup2，理论质量（kg / m）1组2组3组圆钢方钢圆钢方钢允许偏差/ mm5.5±0.20plusmn ，石狮0.40O。 23750.300.1860.23760.28270.360.2220.2836.50.33180.420.2600.33270.38480.490.3020.3858plusmn，0.25plusmn，0.35plusmn，0.400.50770.640.3950.50290.63620.810.4990.636100.78541.00.6170.785 * 1l0.95031.210.7460.95121.1311.440.8881.13131.3271.691。 041.33141.5391.961.2l1.54151.7672.251.391.77162.0112.561.582.01172.2702.891.782.27182.5453.242.002.54192.8353.612.232.83203.1424.002.473.1421plusmn，O操作。 30plusmn，O。40plusmn，O。503.4644.412.723.46223.80l4.842.983.80 * 234.1555.293.264.15244.5245.763.554.52254.9096.253.854.91265.3096.764.175.3l * 275.7267.294.495.72286.1587.844.836.15 * 296.6058.415.186 .60307.0699.005.557.06 * 31plusmn，0.40plusmn，0.50plusmn，0.607.5489.6l5.937.54328.04210.246.318.04 * 338.55310.896.718.55349.09711.567.139.07 * 359.62l12.257.559.623610.1812.967.9910.23811.3414.448.9011.34012.5716 .009.8612.64213.8517.6410.913.84515.9020 .2512.515.94818.1023.0414.218.15019.6425.0015.419.653plusmn,0.60士O. 70plusmn，0.8022.0628.0917.322。 O * 5523.7630.2518.623.75624.6331.3619.324.6 * 5826.4233.6420.726.460plusmn，O。60plusmn，O。70plusmn，0.8028.2736.0022.228.36331.1739.6924.531.2 * 6533.1842.2526。 O33.2 * 6836.3246.2428.536.37038.4849.0030.238.57544.1856.2534.744.28050.2764.0039.550.285plusmn，O。9plusmn，1.0plusmn，1.156.7572.2544.556.79063.6281.0049.963.69570.8890.2555.670.810078.54100.0061.778.510586.59110.2568.086.511095 .03121.0074.695.0115plusmn，1.2plusmn，1.3plusmn，1.4103.82132.2681.5104120113.10144.0088.8113125122.72156.2596.3123130132.73169 .00104133140153.94196.0012l154150176.72225.00139177160 - plusmn，2.0201.06256.00158201170226.98289.00178227180254.47324.00200254190283.53361.00223283200--士2.5314.16400.00247314220380.13 -298-250490.88-385-