Rolled steel bar for hot forging, hot-forged section material, and common rail and method for producing the same

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United States of America Patent

PATENT NO 9994943
APP PUB NO 20180057917A1
SERIAL NO

15646222

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Abstract

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Rolled steel bar for hot forging consisting, by mass percent, of C: 0.25-0.50%, Si: 0.40-1.0%, Mn: 1.0-1.6%, S: 0.005-0.035%, Al: 0.005-0.050%, V: 0.10-0.30%, N: 0.005-0.030% with the balance being Fe and impurities, i.e., P: 0.035% or less and O: 0.0030% or less, wherein Fn1=C+Si/10+Mn/5+5Cr/22+1.65V−5S/7 is 0.90 to 1.20. The predicted maximum width of nonmetallic inclusions at the time when a cumulative distribution function obtained by extreme value statistical processing by taking the width of nonmetallic inclusion in an R1/2 part of a longitudinal cross section of the steel bar as W (mm) is 99.99% is 100 μm or narrower. The number density of sulfides each having a circle-equivalent diameter of 0.3 to 1.0 μm observed per unit area of the R1/2 part of a transverse cross section of the steel bar is 500 pieces/mm2 or higher.

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Patent Owner(s)

Patent OwnerAddress
NIPPON STEEL CORPORATIONCHIYODA-KU TOKYO 100-8071

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Higashida, Masashi Tokyo, JP 10 33
Itou, Toshimasa Aichi, JP 2 16
Makino, Taizo Tokyo, JP 20 67
Matsui, Naoki Tokyo, JP 63 480
Matsumoto, Hitoshi Tokyo, JP 223 5955
Morita, Kouji Aichi, JP 40 262
Neishi, Yutaka Tokyo, JP 56 65
Sashima, Naoyuki Aichi, JP 2 16
Tanimura, Yoshihiro Aichi, JP 12 116

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