PRODUCTION TECHNOLOGY FOR ULTRA-FINE GRAIN WIDE-THICK PIPELINE STEEL PLATE

WIPO Patent Application WO/2019/001464

A1

An ultra-fine grain wide-thick pipeline steel plate and production technology therefor, the steel plate comprising the following components by weight percent: C: 0.040-0.070%; Si: 0.15-0.30%; Mn: 1.30-1.80%; P≤0.015%; S≤0.005%; Nb: 0.030-0.07%; Ti: 0.006-0.020%; Ca: 0.0005-0.0040%; Al: 0.015-0.050%; Ni: 0.10-0.30%; Cr: 0.10-0.30%; Mo: 0.08-0.18%; Cu: 0.1-0.20%; and the remainder being Fe and unavoidable impurities. Uniform-structure bainite and acicular ferrite are obtained by means of reasonable improvement on a blank heating technology, optimization of a rolling schedule and perfection of laminar cooling technology, which ensures the stabilization of the structure and performance, and meets the performance requirements of wide-thick high steel grade pipeline steel.

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HUANG YIXIN (CN)
ZHU RUIRONG (CN)
YAO YONGKUAN (CN)
CHU JUEFEI (CN)
ZHAI DONGYU (CN)

PCT/CN2018/093096

January 03, 2019

June 27, 2018

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NANJING IRON & STEEL CO LTD (CN)

C22C38/58; C21D8/02

WO2011148755A1

2011-12-01

CN107385326A	2017-11-24
CN103147022A	2013-06-12
CN102373387A	2012-03-14
JP2007126707A	2007-05-24

NANJING LI&FENG INTELLECTUAL PROPERTY AGENCY (SPECIAL CENERAL PARTNERSHIP) (CN)

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