80 MM THICK 690 MPA-GRADE ULTRA-HIGH STRENGTH AND TOUGHNESS MARINE STEEL PLATE AND PREPARATION METHOD THEREFOR

WIPO Patent Application WO/2024/001078

A1

The present invention relates to an 80 mm thick 690 MPa-grade ultra-high strength and toughness marine steel plate and a preparation method thereof. The composition thereof by mass percentage are: C: 0.08%-0.10%, Si: 0.20%-0.30%, Mn: 1.10%-1.25%, P≤0.007%, S≤0.002%, Nb: 0.020%-0.030%, Ti: 0.010%-0.020%, V: 0.030%-0.045%, Cr: 0.40%-0.60%, Ni: 1.40%-1.50%, Cu: 0.15%-0.25%, Mo: 0.25%-0.35%, and Als: 0.015%-0.045%, controlling Pcm≤0.33%, Ceq≤0.64%, and the remainder being Fe and inevitable impurity elements. For the 80 mm 690 MPa-grade ultra-high strength marine steel plate of the present invention, all performance indicators meet the certification requirements of China Classification Society EH690 steel, having a -300mV (relative to an Ag/AgCl reference electrode) saturated corrosion current density ≤ 1.90mA/cm2, and a density of corrosion-active inclusions ≤ 9/mm2. The product has high strength, low-temperature resistance, corrosion resistance and other characteristics.

MA HENG (CN)
ZHANG QINGPU (CN)
WANG ZHONGXUE (CN)
WANG TENGFEI (CN)
ZHANG PEI (CN)
HE KANG (CN)
WANG YUEXIANG (CN)
CHEN AIJIAO (CN)
LIU JUNGANG (CN)

PCT/CN2022/139834

January 04, 2024

December 19, 2022

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SHANDONG IRON & STEEL CO LTD (CN)
LAIWU STEEL YINSHAN SECTION CO LTD (CN)

C22C38/02; C21D8/02; C22C33/04; C22C38/04; C22C38/06; C22C38/42; C22C38/44; C22C38/46; C22C38/48; C22C38/50

CN115094322A	2022-09-23
CN102851622A	2013-01-02
CN109161791A	2019-01-08
CN110791713A	2020-02-14
JPS6326339A	1988-02-03
CN103014541A	2013-04-03

FASTA INTELLECTUAL PROPERTY LIMITED (CN)

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