Title:
An upper part method for endurance of an exhaust pipe
Document Type and Number:
Japanese Patent JP5944989
Kind Code:
B2
Abstract:
In an exhaust gas purification apparatus or other apparatuses that are supplied with ammonia generated from a urea aqueous solution and causes selective reduction and purification of nitride oxides, a shot peening treatment is applied to a welded portion of its exhaust pipe which is made of a ferritic stainless steel plate and through which exhaust gas containing ammonia and hydrogen passes. By shot peening the welded portion of the exhaust pipe, a tensile residual stress in the , welded portion of the exhaust pipe can be replaced with a compressive residual stress, and further the diameter of metal crystal grains in the welded portion can be reduced. In this way, the durability of the exhaust pipe can be improved.
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Inventors:
Yoshihiko Nozaki
Joji Hagiwara
Kazuhiro Hirakawa
Norihiro Fujisawa
Joji Hagiwara
Kazuhiro Hirakawa
Norihiro Fujisawa
Application Number:
JP2014518166A
Publication Date:
July 05, 2016
Filing Date:
May 31, 2012
Export Citation:
Assignee:
ud trucks Co., Ltd.
International Classes:
F01N13/08; B23K31/00; B24C1/10; B24C11/00; C21D7/06
Domestic Patent References:
| JP2007278232A | ||||
| JP2001198828A | ||||
| JP6096191B2 | ||||
| JP2004149880A | ||||
| JP58107292A |
Attorney, Agent or Firm:
Moriaki Ogawa
Shoichi Okuyama
Haruyuki Nishiyama
Rie Ikemoto
Mitsuji Sekiya
Reiko Hase
Hidefumi Kawamura
Arihara Koichi
Matsushima Tetsuo
Ayako Nakamura
Satoshi Morimoto
Kyoko Tsunoda
Atsushi Watanabe
Akiko Mizushima
Yu Tanaka
Tokumoto Koichi
Mai Kodama
Toru Masuya
Shoichi Okuyama
Haruyuki Nishiyama
Rie Ikemoto
Mitsuji Sekiya
Reiko Hase
Hidefumi Kawamura
Arihara Koichi
Matsushima Tetsuo
Ayako Nakamura
Satoshi Morimoto
Kyoko Tsunoda
Atsushi Watanabe
Akiko Mizushima
Yu Tanaka
Tokumoto Koichi
Mai Kodama
Toru Masuya