CN110819782A - 一种汽轮机用耐高温环件的锻造方法 - Google Patents
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- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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Abstract
本发明公开了一种汽轮机用耐高温环件的锻造方法,包括以下步骤:S1:电炉熔炼后按照产品规格尺寸进行下料形成坯料,该坯料按照质量百分比包括下列化学成分:碳:0.20‑0.25%、锰:0.50‑1.00%、铬:11.00‑12.50%、镍:0.50‑1.00%、磷≤0.025%、硫≤0.015%、硅:0.20‑0.50%、钼:0.9‑1.25%、钒:0.20‑0.30%、钨:0.90‑1.25%、锡≤0.02%、铝≤0.025%、铜≤0.15%、钴、0.15‑0.20%、钛≤0.025%、N:80‑180PPm,其余为Fe和不可避免的杂质,通过在化学成分中添加了钴,并对N含量进行控制,继而提高了其耐热性以及塑性,锻造时不易发生开裂现象。
Description
技术领域
本发明涉及一种汽轮机用耐高温环件的锻造方法。
背景技术
现有技术中汽轮机用耐高温锻件其成分主要为C:0 .18-0 .24% 、Si:0 .10-0.50%、 Mn:0 .30-0 .80 %、P:≤0 .025%、S:≤0 .020%、Cr:11 .00-12 .5%、Mo:0 .80-1.20%、Ni:0 .30- 0 .80%、V:0 .25-0 .35%,W ≤0 .60%,现有成分无法满足产品在三个方向上的机械性能此外现 有的汽轮机用耐高温锻件,该类钢种材料高温硬度高,可锻性差。锻造温度范围小1150-950 ℃,锻造容易开裂。
发明内容
本发明的目的在于,克服现有技术中存在的缺陷,提供一种汽轮机用耐高温环件的锻造方法。
为实现上述目的,本发明的技术方案是设计一种汽轮机用耐高温环件的锻造方法,包括以下步骤:
S1:电炉熔炼后按照产品规格尺寸进行下料形成坯料,该坯料按照质量百分比包括下列化学成分:碳:0.20-0.25%、锰:0.50-1.00%、铬:11.00-12.50%、镍:0.50-1.00%、磷≤0.025%、硫≤0.015%、硅:0.20-0.50%、钼:0.9-1.25%、钒:0.20-0.30%、钨:0.90-1.25%、锡≤0.02%、铝≤0.025%、铜≤0.15%、钴、0.15-0.20%、钛≤0.025%、N:80-180PPm,其余为Fe和不可避免的杂质;
S2:锻前加热,将坯料置入天然气加热炉中进行加热,炉温应小于 400℃,自由升温 1小时后,然后以每小时 40℃ ~60℃升温到 850℃保温 3 小时,然后再以每小时 120℃ ~140℃,升温至 1200℃,保 温 2 小时后在降温到 1180℃,再保温 1 小时后,出炉开始锻造;
S3:锻造,采用自由锻+碾环的方式,初锻温度为1150℃,终锻温度为850℃,采用三拔两墩进行作业,锻造比大于4,碾环的锻造比为14-15;
S4:锻后退火,首先升温至660℃ 保温17h-18h,而后炉内冷却;
S5:调质处理:包括正火以及回火,正火温度达 1040℃±10℃, 保温时间按照环件厚度尺寸以1.5min/mm计,而后进行油冷;回火时,回火温度为680℃±10℃, 保温时间按照环件厚度尺寸以1.8min/mm计;炉冷至300℃后空冷;
S6:粗加工至达到探伤检验要求;
S7:进行超声波无损检测;
S8:精加工后包装入库。
本发明的优点和有益效果在于:通过在化学成分中添加了钴,并对N含量进行控制,继而提高了其耐热性以及塑性,锻造时不易发生开裂现象。
具体实施方式
下面结合实施例,对本发明的具体实施方式作进一步描述。以下实施例仅用于更加清楚地说明本发明的技术方案,而不能以此来限制本发明的保护范围。
实施例一:
一种汽轮机用耐高温环件的锻造方法,包括以下步骤:
S1:电炉熔炼后按照产品规格尺寸进行下料形成坯料,该坯料按照质量百分比包括下列化学成分:碳:0.20%、锰:0.50%、铬:11.00%、镍:0.50%、磷:0.025%、硫:0.015%、硅:0.20%、钼:0.9%、钒:0.20%、钨:0.90%、锡:0.02%、铝:0.025%、铜:0.15%、钴、0.15%、钛:0.025%、N:80PPm,其余为Fe和不可避免的杂质;
S2:锻前加热,将坯料置入天然气加热炉中进行加热,炉温应小于 400℃,自由升温 1小时后,然后以每小时 40℃ ~60℃升温到 850℃保温 3 小时,然后再以每小时 120℃ ~140℃,升温至 1200℃,保 温 2 小时后在降温到 1180℃,再保温 1 小时后,出炉开始锻造;
S3:锻造,采用自由锻+碾环的方式,初锻温度为1150℃,终锻温度为850℃,采用三拔两墩进行作业,锻造比大于4,碾环的锻造比为14-15;
S4:锻后退火,首先升温至660℃ 保温17h-18h,而后炉内冷却;
S5:调质处理:包括正火以及回火,正火温度达 1040℃±10℃, 保温时间按照环件厚度尺寸以1.5min/mm计,而后进行油冷;回火时,回火温度为680℃±10℃, 保温时间按照环件厚度尺寸以1.8min/mm计;炉冷至300℃后空冷;
S6:粗加工至达到探伤检验要求;
S7:进行超声波无损检测;
S8:精加工后包装入库。
实施例二:一种汽轮机用耐高温环件的锻造方法,包括以下步骤:
S1:电炉熔炼后按照产品规格尺寸进行下料形成坯料,该坯料按照质量百分比包括下列化学成分:碳: 0.25%、锰: 1.00%、铬: 12.50%、镍: 1.00%、磷:0.020%、硫:0.01:2%、硅:0.50%、钼: 1.25%、钒: 0.30%、钨: 1.25%、锡:0.8%、铝:0.020%、铜:0.12%、钴、0.20%、钛:0.025%、N: 180PPm,其余为Fe和不可避免的杂质;
S2:锻前加热,将坯料置入天然气加热炉中进行加热,炉温应小于 400℃,自由升温 1小时后,然后以每小时 40℃ ~60℃升温到 850℃保温 3 小时,然后再以每小时 120℃ ~140℃,升温至 1200℃,保 温 2 小时后在降温到 1180℃,再保温 1 小时后,出炉开始锻造;
S3:锻造,采用自由锻+碾环的方式,初锻温度为1150℃,终锻温度为850℃,采用三拔两墩进行作业,锻造比大于4,碾环的锻造比为14-15;
S4:锻后退火,首先升温至660℃ 保温17h-18h,而后炉内冷却;
S5:调质处理:包括正火以及回火,正火温度达 1040℃±10℃, 保温时间按照环件厚度尺寸以1.5min/mm计,而后进行油冷;回火时,回火温度为680℃±10℃, 保温时间按照环件厚度尺寸以1.8min/mm计;炉冷至300℃后空冷;
S6:粗加工至达到探伤检验要求;
S7:进行超声波无损检测;
S8:精加工后包装入库。
其力学性能需满足下表:
以上所述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明技术原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。
Claims (1)
1.一种汽轮机用耐高温环件的锻造方法,其特征在于,包括以下步骤:
S1:电炉熔炼后按照产品规格尺寸进行下料形成坯料,该坯料按照质量百分比包括下列化学成分:碳:0.20-0.25%、锰:0.50-1.00%、铬:11.00-12.50%、镍:0.50-1.00%、磷≤0.025%、硫≤0.015%、硅:0.20-0.50%、钼:0.9-1.25%、钒:0.20-0.30%、钨:0.90-1.25%、锡≤0.02%、铝≤0.025%、铜≤0.15%、钴、0.15-0.20%、钛≤0.025%、N:80-180PPm,其余为Fe和不可避免的杂质;
S2:锻前加热,将坯料置入天然气加热炉中进行加热,炉温应小于 400℃,自由升温 1小时后,然后以每小时 40℃ ~60℃升温到 850℃保温 3 小时,然后再以每小时 120℃ ~140℃,升温至 1200℃,保 温 2 小时后在降温到 1180℃,再保温 1 小时后,出炉开始锻造;
S3:锻造,采用自由锻+碾环的方式,初锻温度为1150℃,终锻温度为850℃,采用三拔两墩进行作业,锻造比大于4,碾环的锻造比为14-15;
S4:锻后退火,首先升温至660℃ 保温17h-18h,而后炉内冷却;
S5:调质处理:包括正火以及回火,正火温度达 1040℃±10℃, 保温时间按照环件厚度尺寸以1.5min/mm计,而后进行油冷;回火时,回火温度为680℃±10℃, 保温时间按照环件厚度尺寸以1.8min/mm计;炉冷至300℃后空冷;
S6:粗加工至达到探伤检验要求;
S7:进行超声波无损检测;
S8:精加工后包装入库。
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CN111804877A (zh) * | 2020-07-10 | 2020-10-23 | 马鞍山市广源法兰环件有限公司 | 一种大型环件局部连接加工成型工艺 |
CN113512628A (zh) * | 2021-04-09 | 2021-10-19 | 河南中原特钢装备制造有限公司 | 一种改善20Cr13锻坯晶粒度的退火工艺 |
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CN110358895A (zh) * | 2019-07-16 | 2019-10-22 | 江阴市恒润环锻有限公司 | 一种超高压汽轮机用合金环锻件及其制造方法 |
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