US 10,982,296 B2
500 MPA yield strength-graded, high-stretchability hot-dip aluminum-zinc and color-coated steel plate and manufacturing method therefore
Jun Li, Shanghai (CN); Dechao Xu, Shanghai (CN); Xin Liu, Shanghai (CN); Zhilong Ding, Shanghai (CN); Yuling Ren, Shanghai (CN); Xuewei Ye, Shanghai (CN); Hengfa Hu, Shanghai (CN); and Hongming Chen, Shanghai (CN)
Assigned to Baoshan Iron & Steel Co., Ltd., Shanghai (CN)
Appl. No. 15/754,635
Filed by BAOSHAN IRON & STEEL CO., LTD., Shanghai (CN)
PCT Filed Jul. 25, 2016, PCT No. PCT/CN2016/091499
§ 371(c)(1), (2) Date Feb. 23, 2018,
PCT Pub. No. WO2017/036260, PCT Pub. Date Mar. 9, 2017.
Claims priority of application No. 201510540305.6 (CN), filed on Aug. 28, 2015.
Prior Publication US 2018/0245175 A1, Aug. 30, 2018
This patent is subject to a terminal disclaimer.
Int. Cl. B32B 15/08 (2006.01); B32B 15/04 (2006.01); B32B 15/18 (2006.01); B32B 15/20 (2006.01); C23C 2/12 (2006.01); C23C 2/28 (2006.01); C23C 2/40 (2006.01); C23C 2/06 (2006.01); C23F 17/00 (2006.01); C21D 6/00 (2006.01); C21D 9/46 (2006.01); C21D 8/02 (2006.01); C22C 38/14 (2006.01); C22C 38/12 (2006.01); C22C 38/04 (2006.01); C22C 38/02 (2006.01); C22C 38/00 (2006.01); C22C 21/10 (2006.01); C22C 18/04 (2006.01); C22C 30/06 (2006.01); B32B 15/01 (2006.01); C21D 9/48 (2006.01); C21D 1/52 (2006.01); C23C 2/02 (2006.01); C21D 8/04 (2006.01); C23C 2/26 (2006.01); B32B 15/09 (2006.01); C22C 38/50 (2006.01); C22C 38/28 (2006.01); C22C 38/26 (2006.01); C22C 38/48 (2006.01)
CPC C21D 9/46 (2013.01) [B32B 15/012 (2013.01); B32B 15/013 (2013.01); B32B 15/04 (2013.01); B32B 15/043 (2013.01); B32B 15/08 (2013.01); B32B 15/09 (2013.01); B32B 15/18 (2013.01); B32B 15/20 (2013.01); C21D 1/52 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/0205 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/0263 (2013.01); C21D 8/0273 (2013.01); C21D 8/0278 (2013.01); C21D 8/0473 (2013.01); C21D 9/48 (2013.01); C22C 18/04 (2013.01); C22C 21/10 (2013.01); C22C 30/06 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C23C 2/02 (2013.01); C23C 2/06 (2013.01); C23C 2/12 (2013.01); C23C 2/26 (2013.01); C23C 2/28 (2013.01); C23C 2/40 (2013.01); C23F 17/00 (2013.01); C21D 2211/002 (2013.01); C21D 2211/003 (2013.01); C21D 2211/004 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01); Y10T 428/12556 (2015.01); Y10T 428/12562 (2015.01); Y10T 428/12569 (2015.01); Y10T 428/12757 (2015.01); Y10T 428/12799 (2015.01); Y10T 428/12951 (2015.01); Y10T 428/12958 (2015.01); Y10T 428/12965 (2015.01); Y10T 428/12972 (2015.01); Y10T 428/12993 (2015.01); Y10T 428/26 (2015.01)] 19 Claims
OG exemplary drawing
 
1. An aluminium-zinc-hot-dipped steel plate having a yield strength of ≥500 MPa and a high elongation, with the chemical components in mass percentage of a substrate of the steel plate consisting of: 0.07-0.15% of C, 0.02-0.5% of Si, 1.3-1.8% of Mn, N≤0.004%, S≤0.01%, Ti≤0.15%, Nb≤0.050%, and the balance being Fe and other inevitable impurities, wherein said chemical components satisfy formulae provided as follows:
(C+Mn/6)≥0.3%;
Mn/S≥150;
0.01%≤(Nb-0.22C-1.1 N)≤0.05%;
0.5≤Ti/C≤1.5; and
0.04%≤(Ti+Nb)≤0.2%; and
wherein the steel plate has a microstructure which is a complex phase structure comprising ferrite, cementite, fine precipitates, bainite, martensite and deformed banded grains.