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耐热不锈钢

SUS 301L

SUS 301L
上海圆鼎
 
〓〓〓〓〓〓上海圆鼎欢迎您〓〓〓〓〓〓〓〓
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
一、SUS 301L介绍:
SUS 301L超低碳钢,比301耐晶间腐蚀性能好。SUS 301L是在301钢基础上,降低C含量,改善焊口的抗晶界腐蚀性;通过添加N元素来弥补含C量降低引起的强度不足,保证钢的强度。
二、SUS 301L应用和特性:
SUS 301L耐热性能
良好的抗氧化性能可保持到温度高达840°C(如果是间歇使用的状态)及900°C(如果是连续使用的状态)。暴露于400°C以上会造成加工硬化效果的逐渐丧失,800°C时强度相当于退火的301。在蠕变条件下,加工硬化的301强度甚至会下降到低于退火的301。
SUS 301L典型应用:轨道车辆结构部件 -- 滚压成形、折弯成形或拉伸成形制成型材,也采用板材。飞机机身、公路拖车、汽车轮毂盖、雨刮器夹持器具、烤面包机弹簧、炉子夹具、屏幕框架、幕墙等。
 
四、SUS 301L化学成分:
碳C 硅Si 锰Mn 磷P 硫 S 铬Cr
≤0.030 ≤1.00 ≤2.00 ≤0.045 ≤ 0.030 16-18
镍Ni 钼Mo 氮N 铜Cu 铁Fe 铌Nb
5-8 ≤0.20 余量
硼B 钛Ti: 铝Al 钒 V 钨W 铈Ce
~ ~
五、SUS 301L材质规格:
冷扎薄板0.05mm-4.0mm,热扎板:4mm~14mm,带2mm-10mm,各尺寸规格锻件环件,库存个别牌号不定尺。
六、SUS 301L物理性能:
熔点/℃ 比热容
/kg/(kg.k)℃
0-100℃
热导率/w/(m.k)
100~500℃
线胀系数
/(10-6/k)
100~500℃
电阻率
/(Ω.mm2/m)
20℃
纵向弹性模量
/GPa
20℃
  0.5 16.3-21.5 16.5-18.7 0.73 193
密度g/cm 硬度HBW 硬度HRB 磁性    
7.93   91    
七、SUS 301L力学性能:
标准号产品名称 状态 硬度(不大于) 拉伸强度Σb\MPa
延伸率A/%
断面收缩Z/%≥
JIS G43003:2012不锈钢热轧 固溶处理 207HBW
95HRB
218HV
 
550 45  
       
       
圆鼎小知识(固溶作用
钢中合金碳化物的析出与溶解
钢中C是所含合金元素之一,其除能起到一点强化作用之外,对耐蚀性是不利的,特别是C与Cr形成碳化物时,作用更坏,应力求减少它的存在。为此,依据C在奥氏体中随温度不同而变化的特性,即在高温时溶解度大,低温时溶解度小。有资料报导,C在奥氏体中的溶解度在1200℃时为0.34%;1000℃时为0.18%,而600℃时为0.02%,室温时则更少。所以将钢加热到高温,使C-Cr化合物充分溶解,再快速冷却,让其来不及析出,保证钢的耐蚀性,特别是耐晶间腐蚀性。
σ
奥氏体钢如果在500-900℃区间长时间加热,或钢中加入Ti、Nb、Mo等元素时,都会促进σ相析出,使钢增加脆性和降低耐蚀性,消除σ相的手段也是在高于其可能析出温度使其溶解,再快速冷却,防止再析出。
 
工艺:
在标准中,推荐加热温度范围较宽:1000~1150℃,通常采用1020-1080℃。考虑具体牌号成分,是铸件还是锻件等情况,在允许范围内,适当调节加热温度。加热温度低,C-Cr碳化物不能充分溶解,温度太高,也存在晶粒长大,降低耐蚀性问题。
 
冷却方式:应以较快速度冷却,防止碳化物再析出。在我国及其它一些国家标准中,标明固溶化后“快冷” ,综合不同文献资料和实践经验,“快”的尺度可按如下情况掌握:
• 含C量≥0.08%的;含Cr量>22%、Ni量较高的;含C量虽<0.08%,但有效尺寸>3mm的,应水冷;
• 含C量<0.08%、尺寸<3mm,可风冷;
• 有效尺寸≤0.5mm的可空冷
 
七、SUS 301L加工处理和焊接性能:
SUS 301L所有标准的焊接方法都适用。建议使用308L填充。SUS 301L需要高强度的场合。它的加工硬化率很高, 大约14MPa/%Ra(每1%冷加工减面率,抗拉强度增加14MPa),因此通过冷轧和冷成型可达到很高的强度。其金相结构中至少有一部分应变硬化的奥氏体转变为马氏体。301尽管强度高,但仍有足够的残余延展性进行大量的冷成形。其退火状态下无磁性,但冷加工后有很强磁性。
SUS 301L可根据您所需要硬度及宽度交货,1/2H  3/4H H EH TH等  
如有不尽之处可拨打上海圆鼎热线详细咨询〓〓
 
 
 

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