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个人中心播报讨论上传视频钢筋屈服点为235N/MM2收藏查看我的收藏0有用+10同义词Q235A（Q235A）一般指是一种碳素结构钢，属于Q235系列中的A级材料，其屈服强度为235N/mm²。该系列按质量等级分为A、B、C、D、E五种，其中A级适应耐气候温度为+40℃，主要应用于普通建筑结构及机械部件。不同等级的核心差异在于冲击试验温度要求：A级不进行冲击测试，B级需满足20℃冲击功，C级为0℃，D级为-20℃。的化学成分包括碳含量0.14%-0.22%、锰0.30%-0.65%，硫、磷含量较高（均≤0.050%）。其机械性能抗拉强度范围为375-500MPa，伸长率随材料厚度增加逐步降低。该材料通常采用沸腾钢工艺生产，但镇静钢因性能更稳定而被推荐用于焊接结构或低温环境。实际应用中，可用于制造模具把手等非核心零件，经950℃盐浴淬火后硬度可达36-40HRC。中文名Q235A
性    质钢筋屈服点为235N/MM2
等    级Q235A，Q235B，Q235C，Q235D
淬火规范淬火温度为950℃，盐浴炉加热

目录
1简介2等级区别3机械性能4化学成分5淬火规范6运用举例
简介
播报编辑Q235分别有A、B、C、D、E五个等级，A是零上40度，B是零上20度，C是零度以上，D是零下20度，E是零下40度，在偏冷地区对此性能有所要求。
等级区别
播报编辑Q235A，Q235B，Q235C，Q235D这是等级的区分，所代表的，主要是冲击的温度有所不同而已。A、B、C、D所不同的，指的是它们性能中冲击温度的不同。分别为： Q235A级，是不做冲击；Q235B级，是20度常温冲击； Q235C级，是0度冲击； Q235D级，是‐20度冲击。 在不同的冲击温度，冲击的数值也有所不同。在力学性能上，A级只保证常规的抗拉强度、屈服强度和伸长率；B级开始增加180℃冷弯和室温冲击功，C级保证0℃冲击功，D级保证-20℃冲击功，最低值都是27J。但一般市面上不易采购到C级，D级就更不可能。多是用B级通过成分和性能复验达到C级要求后来代替。元素含量：A、B、C、D硫含量依次递减；A和B的磷含量相同，C的磷含量次之，D磷含量最少 Q235 Q235分A、B、C、D四级(GB700‐88)Q235A级含 C0.14~0.22% Mn0.30~0.65 Si≤0.30 S≤0.050 P≤0.045Q235B级含 C0.12~0.20% Mn0.30~0.670 Si≤0.30 S≤0.045 P≤0.045Q235C级含 C≤0.18% Mn0.35~0.80 Si≤0.30 S≤0.040 P≤0.040Q235D级含 C≤0.17% Mn0.35~0.80 Si≤0.35 S≤0.040 P≤0.035就其脱氧方法而言，可以采用F,b,z分别表示为沸腾钢、平镇静钢、镇静钢。沸腾钢是脱氧不完全的钢，塑性和韧性较差。用这种材料制成的焊接结构，受动力载荷作用时接头容易出现裂缝。不宜在低温下工作，有时会产生硬化现象。相比之下，镇静钢质优而匀，塑性和韧性都好。
机械性能
播报编辑Q235的机械性能：抗拉强度（σb/MPa）：375-500伸长率（δ5/%）：≥26（a≤16mm）≥25（a>16-40mm）≥24（a>40-60mm）≥23（a>60-100mm）≥22（a>100-150mm）≥21（a>150mm）其中 a 为钢材厚度或直径。
化学成分
播报编辑C 0.14~0.22%Mn 0.30~0.65Si ≤0.30S ≤0.050P ≤0.045
淬火规范
播报编辑淬火温度为950℃，盐浴炉加热，10%NaCl盐水冷却淬火。
运用举例
播报编辑可用于各种磨具把手以及其他不重要的磨具零件。采用Q235钢做冲头材料，经淬火后不回火直接使用，硬度为36~40HRC，解决了冲头在使用中碎裂的现象。新手上路成长任务编辑入门编辑规则本人编辑我有疑问内容质疑在线客服官方贴吧意见反馈投诉建议举报不良信息未通过词条申诉投诉侵权信息封禁查询与解封©2025 Baidu 使用百度前必读 | 百科协议 | 隐私政策 | 百度百科合作平台 | 京ICP证030173号 京公网安备11000002000001号window.PAGE_DATA= 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概述特性及适用范围：　　表示方法：①由Q+数字+质量等级符号+脱氧方法符号组成。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Q235表示屈服点（σs）为235MPa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方法的符号。质量等级符号分别为A、B、C、D。A指不做冲击，B在20度以上，C在0度以上，D在-20度以上，A到D所不同的，指的是它们性能中冲击温度的不同。分别为：Q235A级，是不作冲击韧性试验要求；Q235B级，是作常温（20℃）冲击韧性试验；Q235C级，是作0℃冲击韧性试验；Q235D级，是作-20℃冲击韧性试验。脱氧方法符号：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。③专门用途的碳素钢，例如桥用钢。④Q代表钢的屈服强度，其后数字表示屈服强度值（MPa），必要时数字后标出质量等级（A、B、C、D、E）和脱氧方法（F、b、Z）。物理性能化学成份碳 C ：≤0.22%硅 Si：≤0.35%锰 Mn：≤1.4%硫 S ：≤0.050%磷 P ：≤0.045%铬 Cr：允许残余含量≤0.30%镍 Ni：允许残余含量≤0.30%铜 Cu：允许残余含量≤0.30%注：脱氧方法:F、Z力学性能抗拉强度 σb (MPa)：370～500屈服强度 σs (MPa)：≤16时:≥235; >16～40时:≥225; >40～60时: ≥215; >60～100 时: ≥215; > 100～150 时: ≥195; >150时: ≥185伸长率 δ5 (%)：≤40时:≥26;>40～60时:≥25;>60～100时:≥24;>100～150时:≥22;>150～200时:≥21;冷弯（弯180°）：【纵向】钢厚度≤16时，弯心直径d=a；钢厚度>16～100时，弯心直径 d=2a；【横向】钢厚度≤16时，弯心直径d=1.5a；钢厚度>16～100时，弯心直径d=2.5a；热处理规范及金相组织热处理规范：热轧。金相组织：铁素体+珠光体。交货状态:一般以热轧（包括控轧）状态交货。根据需方要求，经双方协议，也可以正火处理状态交货。区别Q235A和Q235B的区别：钢材皆属于碳素钢。在国家标准GB/T 700—2006中，对Q235A和Q235B的材质区分主要在钢材的含碳量方面，材质是Q235A的材质含碳量通常在0.14—0.22﹪之间；Q235A的材质不做冲击实验，而Q235B是做常温冲击实验，V型缺口。在与客户协商的情况下，Q235B的含碳量也可以按≤0.22%生产出货。相对来说，材质是Q235B的钢材的机械性能要远远优于材质是Q235A的钢材。一般情况下，钢厂在成品型材出厂之前都在标识牌上做了标识。用户可以在标识牌上判别其材质是Q235A，还是Q235B，或其他材质。设计压力P≤1.6MPa；使用温度为0～350℃；钢板厚度>=20mm。