FREE-CUTTING STEEL AND METHOD FOR MANUFACTURING SAME

WIPO Patent Application WO/2021/201179

A1

Provided is a free-cutting steel which, despite the absence of Pb, is machinable to a degree equal to or greater than a low carbon sulfur-lead composite free-cutting steel. The free-cutting steel: contains, in mass%, not more than 0.08% of C, 0.50-1.50% of Mn, not more than 0.10% of P, 0.250-0.500% of S, 0.005-0.015% of N, more than 0.0100% to 0.0500% of O, 0.50-1.50% of Cr, and a total of 0.050-0.500% of one or more of Si, Al and Ti, with the remainder comprising Fe and unavoidable purities; and comprises constituent components in which a value A, which is defined by formula (1), satisfies 0.40-2.00, and a value B, which is defined by formula (2), satisfies 1.10×10-3 to 1.50×10-2, and a steel structure in which the distribution of sulfides having a circle equivalent diameter of not more than 5 μm is at least 3,000 particles/mm 2.　(1) Value A = [Mn] / [Cr] (2) Value B = (2[Si] + 2[Al] + [Ti]) × [O] [M] is the content (mass%) of the element in parentheses [ ].

JP2024518484	中炭素ホウ素含有鋼及びオンライン焼ならし処理の圧延冷却制御方法
JP5262740	Skin-baked steel with excellent coarse grain prevention characteristics and fatigue characteristics during carburizing and its manufacturing method
JPS59145734	MANUFACTURE OF HIGH TENSILE BOLT OF NOT LESS THAN 70KG/MM2 TENSILE STRENGTH

KASAI MASAYUKI (JP)
FUKUOKA KAZUAKI (JP)
NISHIMURA KIMIHIRO (JP)

PCT/JP2021/014050

October 07, 2021

March 31, 2021

Click for automatic bibliography generation  

JFE STEEL CORP (JP)

C21D8/06; C22C38/00; C22C38/60

JP2004269912A	2004-09-30
JP2004176176A	2004-06-24
JP2004027297A	2004-01-29
JP2002249823A	2002-09-06
JP2009007591A	2009-01-15
CN103966531A	2014-08-06
JP2000160284A	2000-06-13

SUGIMURA Kenji (JP)

View/Download PDF      PDF Help

Previous Patent: FREE-CUTTING STEEL AND METHOD FOR MANUFACTURING SAME

Next Patent: VIBRATION PLATE AND METHOD FOR MANUFACTURING VIBRATION PLATE