PATENT CLAIM ANALYSIS

Application Number: 15781911
Application Type: Utility
Filing Date: 2018-06
Publication Date: 2018-12
Patent Classification: ["420", "087000"]

Abstract:
Provided is an ultra-high-strength steel sheet having high phosphatability and hole expandability, including, by wt %, carbon (C): 0.08% to 0.2%, silicon (Si): 0.05% to 1.3%, manganese (Mn): 2.0% to 3.0%, phosphorus (P): 0.001% to 0.10%, sulfur (S): 0.010% or less, aluminum (Al): 0.01% to 0.1%, chromium (Cr): 0.3% to 1.2%, boron (B): 0.0010% to 0.0030%, titanium (Ti): 0.01% to 0.05%, nitrogen (N): 0.001% to 0.01%, and a balance of iron (Fe) and inevitable impurities, satisfying 3.4≤Ti/N≤10, 1.0≤Mn/(Si+Cr), and 0.7≤Mn*/(Si*+Cr*)≤Mn/(Si+Cr) where Ti, N, Mn, Si, and Cr refer to a weight percent (wt %), and Mn*, Si*, and Cr* refer to an average of values obtained by GDS component analysis from the surface to the 0.1 μm position in the thickness direction.

Claim (Index 6):
A method for manufacturing an ultra-high-strength steel sheet having high phosphatability and hole expandability, the method comprising:\n preparing a steel material comprising, by wt %, carbon (C): 0.08% to 0.2%, silicon (Si): 0.05% to 1.3%, manganese (Mn): 2.0% to 3.0%, phosphorus (P): 0.001% to 0.10%, sulfur (S): 0.010% or less, aluminum (Al): 0.01% to 0.1%, chromium (Cr): 0.3% to 1.2%, boron (B): 0.0010% to 0.0030%, titanium (Ti): 0.01% to 0.05%, nitrogen (N): 0.001% to 0.01%, and a balance of iron (Fe) and inevitable impurities, wherein titanium (Ti) and nitrogen (N) satisfy Formula 1 below, and manganese (Mn), silicon (Si), and chromium (Cr) satisfy Formula 2 below; hot rolling and cold rolling the steel material to manufacture a cold-rolled steel sheet; annealing the cold-rolled steel sheet at 800\u00b0 C. to 850\u00b0 C.; rapidly cooling the annealed cold-rolled steel sheet to a temperature range of a martensite start temperature (Ms) to a bainite start temperature (Bs) and then maintaining the cold-rolled steel sheet; after the maintaining, cooling the cold-rolled steel sheet at a rate of 10\u00b0 C./min to 50\u00b0 C./min; and after the cooling, removing surface oxides from the cold-rolled steel sheet, wherein the maintaining of the cold-rolled steel sheet is performed for a period of time satisfying Formula below, and the removing of the surface oxides is performed in conditions satisfying Formula 6 below,\n 3.4\u2264Ti/N\u226410\u2003\u2003[Formula 1] \n 1.0\u2264Mn/(Si+Cr)\u2003\u2003[Formula 2] \n 300<4729+71C+25Mn\u221216Si+117Cr\u221220.1T+0.01991 2 \u2264500\u2003\u2003[Formula 5] \n (HCl concentration\u00d7HCl temperature)/(1.33+Mn+7.4Si+0.8Cr)\u00d7(47+2.1Mn+13.9Si+4.3Cr)\u22651\u2003\u2003[Formula 6] \n where in Formulas 1 to 6, each of Ti, N, Mn, Si, Cr, and C refers to a weight percent (wt %) of the element, and T in Formula 5 refers to a rapid cooling stop temperature (\u00b0 C.), and a value calculated by Formula 5 is in seconds.

Metadata:
- Claim Count in Document: 9.0
- Percentile: 94.0
- Lexical Diversity: 2.33333
- Patent Class: 420.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['12183519', '15534295', '15539658', '14888394', '13583013']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7601052262552694
- 35 USC 102 Novelty (BERT): 0.5312774096785492
- Combined Prediction Score: 0.7372224445975974
- Mean Citation Score: 334.945096
- Max Citation Score: 356.52863
- Similarity Product: 306.14188244109164

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 1
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test