IP Library › Granted Patent US 11,905,570
Granted Patent B2
US 11,905,570 · App. 17/427,870 · Granted Feb 20, 2024

Hot dip galvanized steel sheet and method for producing same

Inventors: Takafumi Yokoyama (Tokyo, JP); Hiroyuki Kawata (Tokyo, JP); Kunio Hayashi (Tokyo, JP); Yuji Yamaguchi (Tokyo, JP); Satoshi Uchida (Tokyo, JP)
Assignee: NIPPON STEEL CORPORATION
C21D9/46B32B15/013C21D8/0226C21D8/0263C22C38/001C22C38/002C22C38/005C22C38/008C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/16C22C38/18C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52C22C38/54C22C38/60C23C2/02C23C2/0224C23C2/06C23C2/28C23C2/40C21D2211/001C21D2211/002C21D2211/003C21D2211/005C21D2211/008C21D2211/009
View Patent ↗
Loading inventors, assignments & file history…
Monitor This Case
Get email alerts when status or documents change.
Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 11,905,570
App. No.
17/427,870
Granted
Feb 20, 2024
Kind
B2
Abstract

A hot dip galvanized steel sheet includes a base steel sheet and a hot dip galvanized layer on at least one surface of the base metal steel sheet, wherein the base steel sheet has a predetermined chemical composition, and contains, by volume fraction, ferrite: 0% to 50%, retained austenite: 0% to 30%, tempered martensite: 5% or more, fresh martensite: 0% to 10%, and pearlite and cementite in total: 0% to 5%, when there are remaining structures, the remaining structures consist of bainite, a concentration of B atoms at prior austenite grain boundaries is 2.0 atm % or more, and an average effective crystal grain size is 7.0 μm or less, and a method for producing the same.

Claims (38)

1. A hot dip galvanized steel sheet comprising a base steel sheet and a hot dip galvanized layer on at least one surface of the base steel sheet, wherein the base steel sheet has a chemical composition comprising, by mass %,

C: 0.050% to 0.350%,

Si: 0.10% to 2.50%,

Mn: 1.00% to 3.50%,

P: greater than 0% to 0.050%,

S: greater than 0% to 0.0100%,

Al: 0.001% to 1.500%,

N: greater than 0% to 0.0100%,

O: greater than 0% to 0.0100%,

Ti: 0.005% to 0.200%,

B: 0.0005% to 0.0100%,

V: 0% to 1.00%,

Nb: 0% to 0.100%,

Cr: 0% to 2.00%,

Ni: 0% to 1.00%,

Cu: 0% to 1.00%,

Co: 0% to 1.00%,

Mo: 0% to 1.00%,

W: 0% to 1.00%,

Sn: 0% to 1.00%,

Sb: 0% to 1.00%,

Ca: 0% to 0.0100%,

Mg: 0% to 0.0100%,

Ce: 0% to 0.0100%,

Zr: 0% to 0.0100%,

La: 0% to 0.0100%,

Hf: 0% to 0.0100%,

Bi: 0% to 0.0100%,

REM other than Ce and La: 0% to 0.0100% and

a balance of Fe and impurities,

a steel microstructure at a range of ⅛ thickness to ⅜ thickness centered about a position of ¼ thickness from a surface of the base steel sheet contains, by volume fraction,

ferrite: 0% to 50%,

retained austenite: 6% to 30%

tempered martensite: 5% or more,

fresh martensite: 0% to 10%, and

pearlite and cementite in total: 0% to 5%,

when there are remaining structures, the remaining structures comprise bainite,

a concentration of B atoms at prior austenite grain boundaries is 2.0 atm % or more, and an average effective crystal grain size is 7.0 μm or less.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 3, 2021
From: YOKOYAMA, TAKAFUMI; KAWATA, HIROYUKI; HAYASHI, KUNIO; YAMAGUCHI, YUJI; UCHIDA, SATOSHI
To: NIPPON STEEL CORPORATION
Reel/Frame 057068/0704 →
Priority Claims (1)
JP 2019-020067 · Feb 6, 2019 · national
Continuity (1)
Related Publication 20220119908A1 · Apr 21, 2022
Cited By (1)
US 12,529,131