FREE CUTTING STEEL FOR PLASTIC MOLDING DICE EXCELLENT IN FINISHED SURFACE ROUGHNESS

Japanese Patent JP3589619

B2

PROBLEM TO BE SOLVED: To provide a free cutting steel for plastic molding dice low in cost and excellent in finished surface roughness, by which machinability is improved without addition of much amount of elements capable of improving machinability, and without applying special heat treatment, and by which opposite characteristics such as machinability, hardening and finished surface roughness can be improved.
SOLUTION: This free cutting steel for plastic molding dice, low in cost and excellent in finished surface roughness, is composed of 0.20 to 0.60 mass % C, 0.3 to 1.00 mass % Si, 0.50 to 1.50 mass % Mn, 0.010 to 0.050 mass % S, 0.30 to 1.2 mass % Cr, 0.05 to 1.00 Ni, 0.01 to 0.05 mass % Al and the balance Fe with inevitable impurities. The steel has a structure consisting of ferrite and pearlite, wherein the ratio of area of ferrite content is 15 to 40% and the residue is pearlite, and has the hardness of 83 to 97 HRB, and further, contains at least one selected from the group consisting of 0.1 to 1.0 mass % Cu and 0.1 to 1.0 mass % Mo according to necessary.

WO/2011/135976	MOLD AND PROCESS FOR PRODUCTION OF MOLD
WO/2005/065921	PARTICULATE CORE PREFORMING PROCESS
JPH05161928	MOLD MANUFACTURING DEVICE

Toshiaki Takashima
Yukitaka Mizuno
Sadayoshi Furusawa

JP2000193471A

November 17, 2004

June 27, 2000

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Japan High Frequency Steel Industry Co., Ltd.

B29C33/38; C22C38/00; C22C38/40; C22C38/44; (IPC1-7): C22C38/00; B29C33/38; C22C38/40; C22C38/44

JP949067A
JP7179991A
JP11293390A
JP6299235A
JP11158579A
JP11199966A

Masanori Fujimaki

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