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1.发明公开
公开(公告)号：EP3505652A1
公开(公告)日：2019-07-03
申请号：EP17871507.4
申请日：2017-08-10
发明人： JI, Ling , XU, Xiaohong , HUANG, Zhen , SHAO, Shuyan , LIU, Xuewen , KONG, Xiangwei , HU, Shaoxin , ZHANG, Xudong
摘要： The present invention relates to a high-hardenability, medium-carbon, low-alloy round steel for fasteners, the chemical constituents by mass percentage are as follows: C: 0.36∼0.44%, Si: 0.15∼0.40%, Mn: 0.80∼1.00%, Cr: 1.00∼1.15%, Mo: 0.05∼0.25%, Ni: 0.05∼0.25%, Cu: 0.05∼0.25%, Al: 0.015∼0.050%, B: 0.0010∼0.0050%, Ti: 0.020∼0.050%, the balance is Fe; the maximum diameter of the round steel is 65 mm. The manufacturing process are as follows: the raw materials are processed, in sequence, by converter smelting, LF refining, RH/VD degassing to obtain molten steel, feeding Ti wires and ferroboron, continuous casting, rolling into the bar, obtaining the quenched and tempered round steel after quenching and tempering treatment; the quenched and tempered round steel is able to be directly used in processing fasteners which meet ISO 898-1 standard for grade 10.9, such as bolts and the like.
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公开(公告)号：EP3505651B1
公开(公告)日：2023-09-20
申请号：EP16919224.2
申请日：2016-10-18
发明人： MIAO, Pifeng , QIAN, Gang , LIU, Guanyou , CHEN, Liang , WU, Xiaolin , LI, Jingtao , GAO, Zhuzhong , RUAN, Xiaojiang
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公开(公告)号：EP3505651A1
公开(公告)日：2019-07-03
申请号：EP16919224.2
申请日：2016-10-18
发明人： MIAO, Pifeng , QIAN, Gang , LIU, Guanyou , CHEN, Liang , WU, Xiaolin , LI, Jingtao , GAO, Zhuzhong , RUAN, Xiaojiang
摘要： The present invention relates to a rack steel plate with a thickness up to 177.8 mm by a continuous casting slab, the constituents and mass percentages including C0.11∼0.15%, Si0.15∼0.35%, Mn0.95∼1.25%, P≤0.010%, S≤0.002%, Cr0.45∼0.75%, Mo0.4∼0.6%, Ni1.3∼2.6%, Cu0.2∼0.4%, Al0.06∼0.09%, V0.03∼0.06%, Nb≤0.04%, N≤0.006%, B0.001∼0.002%, the balance is Fe and unavoidable impurity elements. The manufacture method includes, in sequence, KR molten steel pretreatment, converter smelting, LF refining, RH refining, continuous casting through a straight-arc continuous casting machine, shielding the continuous casting slab a cover and slowly cooling, cleaning the continuous casting slab, heating, high-pressure water descaling, control rolling, straightening, slowly cooling, quenching and tempering treatment. The rack steel plate of large thickness in present invention has advantages of high strength, good plasticity and excellent toughness at a low temperature, the process method has advantages of simple process, low cost and efficiently quick etc.
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