公开(公告)号：US20250051893A1

公开(公告)日：2025-02-13

申请号：US18718328

申请日：2022-12-12

Applicant: Hyundai Steel Company

Inventor： Nu Ri Shin ,  Yong Ki Seo ,  Ji Hee Son ,  Sang Bae Jung

IPC: C22C38/32 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/28

Abstract: A material for hot stamping according to an embodiment of the present disclosure includes: a steel sheet including carbon (C) in an amount of 0.28 to 0.50 wt %, silicon (Si) in an amount of 0.15 to 0.70 wt %, manganese (Mn) in an amount of 0.5 to 2.0 wt %, phosphorus (P) in an amount of 0.05 wt % or less, sulfur(S) in an amount of 0.01 wt % or less, chromium (Cr) in an amount of 0.1 to 0.5 wt %, boron (B) in an amount of 0.001 to 0.005 wt %, an additive in an amount of 0.1 wt % or less, a remainder of iron (Fe), and other inevitable impurities; fine precipitates distributed inside the steel sheet, wherein the additive includes at least one of titanium (Ti), niobium (Nb), and vanadium (V), the fine precipitates include nitride or carbide of at least one of titanium (Ti), niobium (Nb), and vanadium (V), and traps hydrogen, and a mean diameter variation coefficient, which is a value obtained by dividing a standard deviation of a mean diameter of the fine precipitates by the mean diameter of the fine precipitates, is 0.7 or less.

公开(公告)号：US20250043402A1

公开(公告)日：2025-02-06

申请号：US18718283

申请日：2022-12-12

Applicant: Hyundai Steel Company

Inventor： Nu Ri Shin ,  Yong Ki Seo ,  Ji Hee Son ,  Sang Bae Jung

IPC: C22C38/38 ,  B21D22/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/32

Abstract: The present disclosure provides a material for hot stamping including: a steel sheet including carbon (C) in an amount of 0.19 to 0.25 wt %, silicon (Si) in an amount of 0.1 to 0.6 wt %, manganese (Mn) in an amount of 0.8 to 1.6 wt %, phosphorus (P) in an amount of 0.03 wt % or less, sulfur(S) in an amount of 0.015 wt % or less, chromium (Cr) in an amount of 0.1 to 0.6 wt %, boron (B) in an amount of 0.001 to 0.005 wt %, an additive in an amount of 0.1 wt % or less, a remainder of iron (Fe), and other inevitable impurities; fine precipitates distributed inside the steel sheet, wherein the additive includes at least one of titanium (Ti), niobium (Nb), and vanadium (V), the fine precipitates include nitride or carbide of at least one of titanium (Ti), niobium (Nb), and vanadium (V), the fine precipitates trap hydrogen, and a mean diameter variation coefficient, which is a value obtained by dividing a standard deviation of a mean diameter of the fine precipitates by the mean diameter of the fine precipitates, is 0.8 or less.