METHOD FOR ESTIMATING HEAT TREATMENT STATE OF ACCUMULATED ROUND STEEL BAR

Japanese Patent JP2011168839

A

To provide a method for specifying a dangerous state in a heat treatment.

This method for estimating a heat treatment state is used when applying the heat treatment to accumulated round steel bars in a substantially trapezoidal bundle state in a heating furnace. The method includes a step of determining the material diameter [D] of the round steel bars, the number [n] of the round steel bars, and the accumulated state of the round steel bar bundle, a step of calculating the total sectional area [S_air] of gaps between the round steel bars inside the bundle, and the heat inflow efficiency [L/S] for the entire bundle (where L denotes the peripheral length of the entire bundle, and S denotes the sectional area of the entire bundle) from the condition of the stacked state of the round steel bar bundle, and a step of deriving the numeral value α indicating the magnitude of the temperature difference at the outer surface and the center part of the round steel bar bundle by expression α=D×n×S_air×|ln(L/S)|.

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NAKAMIZO TOSHINAO
YOKOYAMA SHUTA

JP2010033874A

September 01, 2011

February 18, 2010

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SANYO SPECIAL STEEL CO LTD

C21D9/00; C21D1/52; C21D11/00; F27D21/00

Mizuno Katsufumi
Masayuki Kishida
Kawakami adult

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