BOILER HEAT TRANSFER PIPE AND BOILER - MITSUBISHI HEAVY IND LTD

Title:

BOILER HEAT TRANSFER PIPE AND BOILER

Document Type and Number:

Japanese Patent JP2010164207

Kind Code:

A

Abstract:

To provide a boiler heat transfer pipe and a boiler for preventing fracture of a heat transfer pipe.

This boiler includes the boiler heat transfer pipe 10 in which fluid flows and which is composed of steel including at least Cr, and a surface-treated layer formed by performing cold-working on an inner surface of the boiler heat transfer pipe 10, and degrees of treatment on the surface-treated layer at each of sections 11A, 11B, 11C, 11D, 12A, 12B, 12C, 12D of the inner surface are different from each other.

Inventors:

SHIRANE TAKAHIRO
KOMAI NOBUYOSHI
TOYOMARU MAKOTO

Application Number:

JP2009004852A

Publication Date:

July 29, 2010

Filing Date:

January 13, 2009

Export Citation:

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Assignee:

MITSUBISHI HEAVY IND LTD

International Classes:

F22B37/10; C23F15/00; F28F19/06

Attorney, Agent or Firm:

Noriharu Fujita
Kunio Ueda

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