CN112410514A - 风电用42CrMo花键轴锻件的生产方法 - Google Patents
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Abstract
本发明涉及一种风电用42CrMo花键轴锻件的生产方法,下料:取42CrMo号钢作为原材料钢锭,其化学成分要求如下:C:0.38~0.45%,Si:0.17~0.37%,Mn:0.6~0.9%,P:≤0.02%,S:≤0.015%,Cr:0.9~1.2%,Mo:0.2~0.3%,Cu:≤0.2%,Al:0.02~0.045%,Ti:≤100ppm,Ca:≤15ppm,Sn:≤100ppm,Pb:≤100ppm,Bi:≤100ppm,Sb:≤30ppm,As:≤150ppm,H:≤1.8ppm,O:≤18ppm,余量为Fe;锻造;热处理;UT探伤;机加工。
Description
技术领域
本发明涉及风电用42CrMo花键轴锻件的生产方法。
背景技术
风力发电机组运转环境非常恶劣,受力情况复杂,要求所用的材料除了满足机械强度条件外,还应满足极端温差条件下所具有的材料特性,如抗低温冷脆性、冷热温差影响下的尺寸稳定性等等。对齿轮和轴类零件而言,由于其传递动力的作用而要求极为严格的选材和结构设计。为了获得良好的锻造组织纤维和相应的力学特性,要制定合理的锻造工艺、热处理工艺,才能保证了材料的综合机械性能达到设计要求。
发明内容
本发明的目的是提供一种能够提高42CrMo冲击韧性、低温韧性、抗过热性的风电用42CrMo花键轴锻件的生产方法。
为实现上述目的,本发明所采用的技术方案是:风电用42CrMo花键轴锻件的生产方法,其步骤如下:下料→锻造→热处理→UT探伤→机加工;
1)下料:取42CrMo号钢作为原材料钢锭,其化学成分要求如下:C:0.38~0.45%,Si:0.17~0.37%,Mn:0.6~0.9%,P:≤0.02%,S:≤0.015%,Cr:0.9~1.2%,Mo:0.2~0.3%,Cu:≤0.2%,Al:0.02~0.045%,Ti:≤100ppm,Ca:≤15ppm,Sn:≤100ppm,Pb:≤100ppm,Bi:≤100ppm,Sb:≤30ppm,As:≤150ppm,H:≤1.8ppm,O:≤18ppm,余量为Fe;
2)锻造:将钢锭预热后置入锻造炉内,将钢锭加热至1220±10℃,然后保温2~3h,然后对钢锭进行锻打,始锻温度为1220℃,终锻温度为800℃,在锻打过程中,先进行两拔两镦,即拔长→镦粗→拔长→镦粗,每次拔长的锻造比为1.8~1.9,每次镦粗的锻造比为1.7~2,两拔两镦完成后进行冲孔,冲孔完成后再进行芯棒拔长,芯棒拔长的锻造比大于1.5;钢锭经过锻打后形成锻件,锻件在密闭的锻造炉内由终锻温度自然冷却到室温;
3)热处理:先经过机械加工去除锻件的氧化表皮,然后对锻件进行正火+回火处理,即先以≤150℃/h的加热速率将锻件加温到850~880℃,保温5~5.5h,然后空冷至300℃以下,然后以≤150℃/h的加热速率将锻件加温到650~670℃,保温8.5~9h,然后空冷至室温;
4)对经过热处理的锻件进行UT探伤;
5)对UT探伤检验合格的锻件进行机加工,使锻件加工成符合尺寸要求的花键轴锻件。
进一步的,前述的风电用42CrMo花键轴锻件的生产方法,其中,步骤1)中钢锭下料时采用电炉+钢包精炼+真空精炼的冶炼方法。
进一步的,前述的风电用42CrMo花键轴锻件的生产方法,其中,UT探伤按照EN10228-3标准执行,质量等级不低于4级。
本发明中,Mn、Mo是提高淬透性的元素,提高Mn、Mo的含量有利于提高42CrMo的淬透性。分别控制P含量不高于0.02%,S含量不高于0.015%有利于提高材料纯净度,并且使42CrMo在高温回火后得到更好的冲击轫性。在锻打过程中,经过两拔两镦可以使42CrMo的晶粒度更加细小,为后续正火+回火的热处理提高了热学性能。正火+回火工艺能够得到回火索氏体金相组织,从而提高42CrMo的强度、低温韧性、抗过热性及淬硬层深度。
具体实施方式
下面结合具体实施例对本发明所述的技术方案作进一步说明。
本发明所述的风电用42CrMo花键轴锻件的生产方法,其步骤如下:下料→锻造→热处理→UT探伤→机加工;
1)下料:取42CrMo号钢作为原材料钢锭,其化学成分要求如下:C:0.38~0.45%,Si:0.17~0.37%,Mn:0.6~0.9%,P:≤0.02%,S:≤0.015%,Cr:0.9~1.2%,Mo:0.2~0.3%,Cu:≤0.2%,Al:0.02~0.045%,Ti:≤100ppm,Ca:≤15ppm,Sn:≤100ppm,Pb:≤100ppm,Bi:≤100ppm,Sb:≤30ppm,As:≤150ppm,H:≤1.8ppm,O:≤18ppm,余量为Fe;钢锭下料时采用电炉+钢包精炼+真空精炼的冶炼方法;
2)锻造:将钢锭预热后置入锻造炉内,将钢锭加热至1220±10℃,然后保温2~3h,然后对钢锭进行锻打,始锻温度为1220℃,终锻温度为800℃,在锻打过程中,先进行两拔两镦,即拔长→镦粗→拔长→镦粗,每次拔长的锻造比为1.8~1.9,每次镦粗的锻造比为1.7~2,两拔两镦完成后进行冲孔,冲孔完成后再进行芯棒拔长,芯棒拔长的锻造比大于1.5;钢锭经过锻打后形成锻件,锻件在密闭的锻造炉内由终锻温度自然冷却到室温;
3)热处理:先经过机械加工去除锻件的氧化表皮,然后对锻件进行正火+回火处理,即先以≤150℃/h的加热速率将锻件加温到850~880℃,保温5~5.5h,然后空冷至300℃以下,然后以≤150℃/h的加热速率将锻件加温到650~670℃,保温8.5~9h,然后空冷至室温;
4)对经过热处理的锻件进行UT探伤,UT探伤按照EN10228-3标准执行,质量等级不低于4级;
5)对UT探伤检验合格的锻件进行机加工,使锻件加工成符合尺寸要求的花键轴锻件。
以本发明所述生产方法制造出来的42CrMo花键轴锻件的部分技术指标如下表:
Claims (3)
1.风电用42CrMo花键轴锻件的生产方法,其特征在于:其步骤如下:下料→锻造→热处理→UT探伤→机加工;
1)下料:取42CrMo号钢作为原材料钢锭,其化学成分要求如下:C:0.38~0.45%,Si:0.17~0.37%,Mn:0.6~0.9%,P:≤0.02%,S:≤0.015%,Cr:0.9~1.2%,Mo:0.2~0.3%,Cu:≤0.2%,Al:0.02~0.045%,Ti:≤100ppm,Ca:≤15ppm,Sn:≤100ppm,Pb:≤100ppm,Bi:≤100ppm,Sb:≤30ppm,As:≤150ppm,H:≤1.8ppm,O:≤18ppm,余量为Fe;
2)锻造:将钢锭预热后置入锻造炉内,将钢锭加热至1220±10℃,然后保温2~3h,然后对钢锭进行锻打,始锻温度为1220℃,终锻温度为800℃,在锻打过程中,先进行两拔两镦,即拔长→镦粗→拔长→镦粗,每次拔长的锻造比为1.8~1.9,每次镦粗的锻造比为1.7~2,两拔两镦完成后进行冲孔,冲孔完成后再进行芯棒拔长,芯棒拔长的锻造比大于1.5;钢锭经过锻打后形成锻件,锻件在密闭的锻造炉内由终锻温度自然冷却到室温;
3)热处理:先经过机械加工去除锻件的氧化表皮,然后对锻件进行正火+回火处理,即先以≤150℃/h的加热速率将锻件加温到850~880℃,保温5~5.5h,然后空冷至300℃以下,然后以≤150℃/h的加热速率将锻件加温到650~670℃,保温8.5~9h,然后空冷至室温;
4)对经过热处理的锻件进行UT探伤;
5)对UT探伤检验合格的锻件进行机加工,使锻件加工成符合尺寸要求的花键轴锻件。
2.根据权利要求1所述的风电用42CrMo花键轴锻件的生产方法,其特征在于:步骤1)中钢锭下料时采用电炉+钢包精炼+真空精炼的冶炼方法。
3.根据权利要求1所述的风电用42CrMo花键轴锻件的生产方法,其特征在于:UT探伤按照EN10228-3标准执行,质量等级不低于4级。
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