CN112090981A - S690q材料强化升级的方法 - Google Patents
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Abstract
本发明公开了一种S690Q材料强化升级的方法,包括以下步骤:1)将S690Q毛坯管一端车夹头,使其尺寸与冷拔模具相匹配;2)对毛坯管依次经酸洗、清洗中和、磷化、皂化的表面处理;3)将表面处理完毕的毛坯管放置在冷拔机上进行冷拔,减壁量为1.5‑4mm;4)对冷拔后的毛坯管调质处理;5)调质后的毛坯管内外表面喷砂除氧化皮,再依次经酸洗、清洗中和、磷化、皂化的表面处理;6)将表面处理完毕的毛坯管放置在冷拔机上进行拔精整,减壁量在0.5±0.3mm;7)所得管进行矫直,然后进行去应力处理,最后进行点式矫直,得到高精度、高强度无缝钢管。处理后的材料可以达到S890Q材料的屈服强度,同时提高材料的尺寸精度,内外加工余量更少,材料损耗更少。
Description
技术领域
本发明涉及金属材料加工领域,具体为一种S690Q材料强化升级的方法。
背景技术
工程机械产品升级,高端油缸具备高强度、冲击性能、可加工性、良好的焊接性能。S890Q高强管材料为确保其机械性能,冶炼需要添加Ni、Ti、Mo、Cr等合金元素,造成材料价格高,且碳当量较S690Q高10左右%。目前S890Q高端油缸都采用热轧管;由于热轧管直线度较差,1.5mm/1000mm,尺寸精度较差,使用热轧管油缸的内外加工余量较大,材料耗损较大。
其中S690Q与S890Q两者的熔炼化学成分对比见表1,单位为%。
表1
发明内容
本发明提供一种S690Q材料强化升级的方法,可以达到S890Q材料的屈服强度,同时提高材料的尺寸精度,内外加工余量更少,材料损耗更少。
本发明所采取的技术方案是,一种S690Q材料强化升级的方法,包括以下步骤:
1)将S690Q毛坯管一端车夹头,使其尺寸与冷拔模具相匹配;
2)对毛坯管依次经酸洗、清洗中和、磷化、皂化的表面处理;
3)将表面处理完毕的毛坯管放置在冷拔机上进行冷拔,减壁量为1.5-4mm;
4)对冷拔后的毛坯管调质处理;
5)调质后的毛坯管内外表面喷砂除氧化皮,再依次经酸洗、清洗中和、磷化、皂化的表面处理;
6)将表面处理完毕的毛坯管放置在冷拔机上进行拔精整,减壁量在0.5±0.3mm;
7)所得管进行矫直,然后进行去应力处理,最后进行点式矫直,得到高精度、高强度无缝钢管。
进一步地,所述S690Q毛坯管的碳含量≤0.20%,碳当量CEV≤0.67%;毛坯管还符合GB/T8162的规定。
进一步地,步骤2)中酸洗、清洗中和、磷化、皂化各工序处理时间为10-40分钟。
进一步地,步骤3)中的减壁量大于步骤6)的减壁量。
进一步地,步骤4)中调质处理时,在920±10℃淬火,在500~600℃回火,基体硬度控制在265-305HBW。
进一步地,步骤5)中酸洗、清洗中和、磷化、皂化各工序处理时间为15-40分钟。
进一步地,步骤7)中在480-600℃进行去应力处理。
进一步地,S690Q毛坯管规格为φ194mm×21mm;其中车夹头时尺寸外径Φ192,内径Φ160,长度260mm,内孔不加工;一次冷拔到Φ194mm×18mm,减壁量为3mm;拔精整至Φ194mm/Φ159mm。
本发明具有以下有益效果:
本发明采用S690Q材料,其价格远低于S890Q材料,每吨便宜4000元左右,采用S690Q材料经冷拔、调质、冷拔精整处理,得到的材料不仅可以达到S890Q强度,而且通过冷挤压,能够提升钢管的尺寸精度,从而减少产品加工余量,材料损耗更少,有较高的性价比。
常规的冷拔处理,原材料硬度较低。本发明人中采用S690Q升级至相当于S890Q的材料,由于热处理后硬度较高,一般在265~305HB之间,在冷拔精整过程中,模具承载力大,容易造成模具破损,本发明在第一次冷拔和拔精整时严格控制模具尺寸,有效控制精整冷拔的减壁量,可以实现量产。
本发明提供的S690Q材料保证了一定的碳当量及合金元素,有较好的焊接系数及热处理后有较好的力学性能;而且具有一定的硬度,保证最终成品的力学性能,也有较好的冷拔性能;同时便于机械加工。S690Q材料经合适的冷拔减壁量,及冷加工强化,从而超过S890的强度,再经过去应力退火,其强度及冲击韧性满足S890的要求。
具体实施方式
下面结合实施例来进一步说明本发明,但本发明要求保护的范围并不局限于实施例表述的范围。
实施例1:
S690Q原材料化学成分如下表1,规格φ194×21。
表1
注:基于熔炼成分,计算碳当量CEV(IIW):0.57;
按GB/T8162要求检测冷拔用S690毛坯管的表面质量,不得有气孔、裂纹、轧折、结疤、离层等缺陷;
该钢管的处理方法包括以下步骤:
1、对毛坯一端车夹头,尺寸外径φ192,内径φ160,长度260mm,内孔不加工;
2、对毛坯管依次经酸洗、清洗中和、磷化、皂化的表面处理,其中每个工序的处理时间为10-40分钟;
3、将表面处理完毕的毛坯管放置在冷拔机上进行冷拔,一次冷拔到φ194mm×18mm,减壁量为3mm;
4、对冷拔后的毛坯管调质处理:920℃淬火+500~600℃回火,基体硬度控制在265-305HBW;
5、对调质后的毛坯管内外表面喷砂除氧化皮,然后依次经酸洗、清洗中和、磷化、皂化的表面处理,其中每个工序的处理时间为15-40分钟;
6、将表面处理完毕的毛坯管放置在冷拔机上进行拔精整至φ194mm/φ159mm,减壁量0.5±0.3mm;
7、步骤6所得的试件进行矫直,然后480-600℃进行去应力处理,最后进行点式矫直,得到处理完毕的高精度、高强度SY890无缝钢管。
得到最终冷拔钢管的指标如下:
尺寸精度:IT9-IT14;
内孔圆度:小于公称直径的0.3%;
直线度:0.3-0.6mm/m;
基体硬度:HB275-320;
力学性能指标:抗拉强度≥950MPa,屈服强度≥890MPa,断后伸长率≥14%,断面收缩率≥45%,冲击功AKV2(-20℃)≥50J。
Claims (8)
1.一种S690Q材料强化升级的方法,其特征在于,包括以下步骤:
1)将S690Q毛坯管一端车夹头,使其尺寸与冷拔模具相匹配;
2)对毛坯管依次经酸洗、清洗中和、磷化、皂化的表面处理;
3)将表面处理完毕的毛坯管放置在冷拔机上进行冷拔,减壁量为1.5-4mm;
4)对冷拔后的毛坯管调质处理;
5)调质后的毛坯管内外表面喷砂除氧化皮,再依次经酸洗、清洗中和、磷化、皂化的表面处理;
6)将表面处理完毕的毛坯管放置在冷拔机上进行拔精整,减壁量在0.5±0.3mm;
7)所得管进行矫直,然后进行去应力处理,最后进行点式矫直,得到高精度、高强度无缝钢管。
2.根据权利要求1所述的方法,其特征在于:所述S690Q毛坯管的碳含量≤0.20%,碳当量CEV≤0.67%;毛坯管还符合GB/T8162的规定。
3.根据利要求1所述的方法,其特征在于:步骤2)中酸洗、清洗中和、磷化、皂化各工序处理时间为10-40分钟。
4.根据权利要求1所述的方法,其特征在于:步骤3)中的减壁量大于步骤6)的减壁量。
5.根据权利要求1所述的方法,其特征在于:步骤4)中调质处理时,在920±10℃淬火,在500~600℃回火,基体硬度控制在265-305HBW。
6.根据权利要求1所述的方法,其特征在于:步骤5)中酸洗、清洗中和、磷化、皂化各工序处理时间为15-40分钟。
7.根据权利要求1所述的方法,其特征在于:步骤7)中在480-600℃进行去应力处理。
8.根据权利要求1-7任意一项所述的方法,其特征在于:S690Q毛坯管规格为φ194mm×21mm;其中车夹头时尺寸外径Φ192,内径Φ160,长度260mm,内孔不加工;一次冷拔到Φ194mm×18mm,减壁量为3mm;拔精整至Φ194mm/Φ159mm。
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CN115305328A (zh) * | 2021-12-23 | 2022-11-08 | 天津北特汽车零部件有限公司 | 一种新型材料强化机械性能工艺 |
CN116219279A (zh) * | 2022-12-23 | 2023-06-06 | 鞍钢股份有限公司 | 一种高强度高韧性核反应堆安全壳用钢及其制造方法 |
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CN116219279B (zh) * | 2022-12-23 | 2024-04-16 | 鞍钢股份有限公司 | 一种高强度高韧性核反应堆安全壳用钢及其制造方法 |
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