上海晟骞实业有限公司,位于上海宝山,公司致力于为客户提高质量低价格的钢铁产品为目标,努力为客户创造价值为己任,拥有先进的开平分条设备和强大的物流配送系统,可以随时满足客户的各种需求,公司已规格齐全,价格便宜,配送快捷的经营优势,已守信用,重质量的服务理念赢得广大用户的信赖和一致**品种包括:汽车钢、热轧卷板、酸洗板、冷轧板、冷轧卷、镀锌板、镀锌卷、硅钢片、彩涂板、彩涂卷、电镀锌板、镀铝锌板、镀锡板。 钢材外观 钢材的表面上,若是钢材外表有麻面,结疤,裂纹等现象,即可判断他是伪劣产品;从金属光泽上看,伪劣产品无金属光泽,呈淡红色或类似生铁的颜色;劣质钢材的横筋经常出会现充不满的现象,原因是厂家为达到大的负公差,制品前几道的压下量偏大,铁型偏小,孔型充不满。 劣质钢材横截面呈椭圆型; 伪劣钢材的内径尺寸波动较大;伪劣钢材螺纹钢的纵筋经常呈波浪形。 选购标准 标准是对重复性事物和概念所做的统一规定。它以科学、技术和实践经验的综合成果为基础,经有关方面协商一致,由主管机构批准,以特定形式发布,作为共同遵守的准则和依据。我国钢铁产品执行的标准有国家标准(GB、GB/T)、行业标准(YB)、地方标准和企业标准。 保证条件 按照金属材料技术条件的规定,生产厂应该进行检验并保证检验结果符合规定要求的性能、化学成分、内部组织等质量指标,称为保证条件。 质量证书 金属材料的生产和其他工业产品的生产一样,是按统一的标准规定进行的,执行产品出厂检验制度,不合格的金属材料不准交货。对于交货的金属材料,生产厂提供质量证明书以保证其质量。金属材料的质量证明书不仅说明材料的名称、规格、交货件数、重量等,而且还提供规定的保证项目的全部检验结果。 技术条件 标准中规定产品应该达到的各项性能指标和质量要求称为技术条件,如化学成分、外形尺寸、表面质量、物理性能、力学性能、工艺性能、内部组织,交货状态等。 钢材产品清洁保养知识 钢材长期地暴露在空气中,是很容易发生锈蚀或者其他的质量问题,所以在使用的时候需要采用喷砂结合电动钢刷除锈工艺,做好防腐防锈蚀处理。 一般大多数钢材的耐火性能是较差的,钢材会根据温度的变化而发生变化,所以钢材是必须用耐火材料对钢 结构进行必要的维护。 建筑物及建筑材料耐火性能是必须要保证的,所以需要在外露钢构件的表面刷防火涂料。 钢材机械性能名词 屈服点 钢材或试样在拉伸时,当应力**过弹性极限,即使应力不再增加,而钢材或试样仍继续发生明显的塑性变形,称此现象为屈服,而产生屈服现象时的较小应力值即为屈服点。设 Ps 为屈服点 s 处的外力, Fo 为试样断面积,则屈服点σ s =Ps/Fo(MPa) , MPa 称为兆帕等于 N (牛顿) /mm2 ,( MPa=106Pa , Pa :帕斯卡 =N/m2 ) 屈服强度 有的金属材料的屈服点较不明显,在测量上有困难,因此为了衡量材料的屈服特性,规定产生*残余塑性变形等于一定值(一般为原长度的 0.2% )时的应力,称为条件屈服强度或简称屈服强度σ 0.2 。 抗拉强度 材料在拉伸过程中,从开始到发生断裂时所达到的应力值。它表示钢材抵抗断裂的能力大小。与抗拉强度相应的还有抗压强度、抗弯强度等。设 Pb 为材料被拉断前达到的拉力, Fo 为试样截面面积,则抗拉强度σ b= Pb/Fo ( MPa )。 伸长率 材料在拉断后,其塑性伸长的长度与原试样长度的百分比叫伸长率或延伸率。 屈强比 钢材的屈服点(屈服强度)与抗拉强度的比值,称为屈强比。屈强比越大,结构零件的可靠性越高,一般碳素钢屈强比为 0.6-0.65 ,低合金结构钢为 0.65-0.75 合金结构钢为 0.84-0.86 。 硬度 硬度表示材料抵抗硬物体压入其表面的能力。它是金属材料的重要性能指标之一。一般硬度越高,耐磨性越好。常用的硬度指标有布氏硬度、洛氏硬度和维氏硬度。 氏硬度 以一定的载荷(一般 3000kg )把一定大小(直径一般为 10mm )的淬硬钢球压入材料表面,保持一段时间,去载后,负荷与其压痕面积之比值,即为布氏硬度值( HB ),单位为公斤力 /mm2 (N/mm2) 。 洛氏硬度 当 HB>450 或者试样过小时,不能采用布氏硬度试验而改用洛氏硬度计量。它是用一个**角 120 °的金刚石圆锥体或直径为 1.59 、 3.18mm 的钢球,在一定载荷下压入被测材料表面,由压痕的深度求出材料的硬度。根据试验材料硬度的不同,分三种不同的标度来表示: HRA 是采用 60kg 载荷和钻石锥压入器求得的硬度,用于硬度较高的材料(如硬质合金等)。 HRB 是采用 100kg 载荷和直径 1.58mm 淬硬的钢球,求得的硬度,用于硬度较低的材料(如退火钢、铸铁等)。 HRC 是采用 150kg 载荷和钻石锥压入器求得的硬度,用于硬度很高的材料(如淬火钢等)。 维氏硬度 以120kg 以内的载荷和**角为 136 °的金刚石方形锥压入器压入材料表面,用材料压痕凹坑的表面积除以载荷值,即为维氏硬度值( HV ) VDA-239-HR600Y780T-FB-UC-U VDA-239-CR590Y980T-DP-GI50-50-U-O VDA-239-HR440Y580T-FB-UC-U VDA-239-CR590Y980T-DP-GI50-50-U-O VDA-239-HR300Y450T-FB-UC-U VDA-239-CR440Y780T-DP-GI50-50-U-O VDA-239-CR780Y980T-CP-UC-U VDA-239-CR330Y590T-DP-GI50-50-U-O VDA-239-CR570Y780T-CP-UC-U VDA-239-CR290Y490T-DP-GI50-50-U-O VDA-239-CR450Y780T-TR-UC-U VDA-239-CR780Y980T-CP-GI50-50-U-O VDA-239-CR400Y690T-TR-UC-U VDA-239-CR570Y780T-CP-GI50-50-U-O VDA-239-HR330Y580T-DP-UC-U VDA-239-CR450Y780T-TR-GI50-50-U-O VDA-239-CR700Y980T-DP-UC-U VDA-239-HR300Y580T-DP-GI50-50-U-O VDA-239-CR590Y980T-DP-UC-U VDA-239-CR700Y980T-DP-GI50-50-U-O VDA-239-CR440Y780T-DP-UC-U VDA-239-CR590Y980T-DP-GI50-50-U-O VDA-239-CR330Y590T-DP-UC-U VDA-239-CR440Y780T-DP-GI50-50-U-O VDA-239-CR290Y490T-DP-UC-U VDA-239-CR330Y590T-DP-GI50-50-U-O VDA-239-CR450Y780T-TR-UC-U VDA-239-CR290Y490T-DP-GI50-50-U-O VDA-239-CR400Y690T-TR-UC-U 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