Title:
WIRE MATERIAL FOR USE IN BOLTS THAT HAS EXCELLENT ACID PICKLING PROPERTIES AND RESISTANCE TO DELAYED FRACTURE AFTER QUENCHING AND TEMPERING, AND BOLT
Document Type and Number:
WIPO Patent Application WO/2016/158361
Kind Code:
A1
Abstract:
A wire material for use in bolts that has excellent acid pickling properties and resistance to delayed fracture after quenching and tempering is provided. This wire material, for use in bolts and having excellent acid pickling properties and resistance to delayed fracture after quenching and tempering, contains, in mass%, C: 0.3-0.6%, Si: 1.0-3.0%, Mn: 0.1-1.5%, P: more than 0% and less than or equal to 0.020%, S: more than 0% and less than or equal to 0.020%, Cr: 0.3-1.5%, Al: 0.02-0.10%, and N: 0.001-0.020%, the remainder being iron and unavoidable impurities, wherein the ferrite area ratio in the position d×1/4 in the wire material, d being the diameter of the wire material, is 10-40%, the remainder being bainite, pearlite, and unavoidably occurring structures, and the amount of C in the position at a depth of 0.1 mm from the surface is 50-100% of the amount of C in the base material.
Inventors:
MATSUMOTO YOSUKE
CHIBA MASAMICHI
CHIBA MASAMICHI
Application Number:
PCT/JP2016/058034
Publication Date:
October 06, 2016
Filing Date:
March 14, 2016
Export Citation:
Assignee:
KK KOBE SEIKO SHO(KOBE STEEL LTD ) (JP)
International Classes:
C22C38/00; C22C38/18; C22C38/50; F16B35/00; C21D8/06
Domestic Patent References:
| WO2011048971A1 | 2011-04-28 | |||
| WO2015001950A1 | 2015-01-08 |
Foreign References:
| JP2003183780A | 2003-07-03 | |||
| JP2005029870A | 2005-02-03 | |||
| JPH0754042A | 1995-02-28 |
Attorney, Agent or Firm:
UEKI, Kyuichi et al. (JP)
Hisakazu Ueki (JP)
Hisakazu Ueki (JP)
Download PDF:
Previous Patent: CONVEYANCE APPARATUS
Next Patent: DRY FILM, CURED PRODUCT, LAMINATE, AND METHOD FOR FORMING RESIST PATTERN
Next Patent: DRY FILM, CURED PRODUCT, LAMINATE, AND METHOD FOR FORMING RESIST PATTERN