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    30crmo厚壁钢管厂家
    作者:山东无缝钢管厂 来源:http://www-gang-guan-com.topwebhostingchoice.com 日期:2019/4/3 10:41:03
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    30crmo钢管

    30crmo铬钼合金钢,这种钢是我国合金钢的一种,30是指含碳量.用它制造10.9S 8.8S的高强度螺栓.但使用前必须经过化验,确认它的成分含量后,才可放心使用.中国牌号30CrMO相当于日本SCM430化学成分

     

    30crmo钢管热处理:

    第一次淬火加热温度(℃):880;冷却剂:水、油

    第二次淬火加热温度(℃):-

    回火加热温度(℃):540;冷却剂:水、油

    抗拉强度(σb/MPa):≥930

    屈服点(σs/MPa):≥785

    断后伸长率(δ5/%):≥12

    断面收缩率(ψ/%):≥50

    冲击吸收功(Aku2/J):≥63

    布氏硬度(HBS100/3000)(退火或高温回火状态)≤229 

    30crmo钢管调质回火处理

    退火annealing No.1 "760±10℃退火,炉冷至400℃空冷。

    HB220-230

    正火normalize No.4 860±10℃正火,出炉空冷。

    调质quenching+tempering No.5 840±10℃淬水或油(视产品型状复杂程度),680-700度回火。 HB<217

    调质quenching+tempering No.6 840±10℃淬油,再470度回火处理。 HRC41-45

    调质quenching+tempering No.7 840±10℃淬油,再480度回火处理。 HRC35-45

    调质quenching+tempering No.8 850℃淬油,再510度回火处理。 HRC38-42

    调质quenching+tempering No.9 850℃淬油,再500度回火处理。 HRC40-43

    调质quenching+tempering No.10 850℃淬油,再510℃回火处理。 HRC36-42

    调质quenching+tempering No.11 850℃淬油,再560℃回火处理。 HRC32-36

    调质quenching+tempering No.12 860℃淬油,再390度回火处理。 HRC48-52

     

    30crmo钢管主要特性

    此钢具有高的强度和韧性,淬透性较高,在油中临界淬透直径15~70mm;钢的热强度性也较好,在500℃以下具有足够的高温强度,但550℃时其强度显著下降;当合金元素在下限时焊接相当好,但接近上限时焊接性中等,并在焊前需预热到175℃以上;钢的可切削性良好,冷变形时塑性中等;热处理时在300~350℃的范围有第一类回火脆性;有形成白点的倾向。

    30crmo钢管应用举例

    这种钢通常是在调质状态下使用,当含碳量为下限的钢也可用作要求心部强度较高的渗碳钢。在中型机械制造业中主要用于制造截面较大、在高应力条件下工作的调质零件,如轴、主轴以及受高负荷的操纵轮、螺栓、双头螺栓、齿轮等;在化工工业中用来制造焊接零件、板材与管材构成的焊接结构和在含有氮氢介质中工作的温度不超过250℃的高压导管;在汽轮机、锅炉制造业中用于制造 450℃以下工作的紧固件、500℃以下受高压的法兰和螺母,尤其适于制造300大气压、400℃以下工作的导管。


     

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