AHSS Scale-Up Patents: Leaders, Trends & White Space 2026
- Filings have declined since the 2019 peak. 162 filings in 2017 rose to a peak of 186 in 2019, then eased toward the 2022 midpoint of 134 — the claim space around scale-up is settling rather than expanding.
- Heat treatment and alloy chemistry dominate the IPC mix. C21D and C22C each cover roughly 97% of the 2,229 records, while casting, rolling and coating subclasses each sit well under 15% — the process-hardware side is comparatively open.
- Momentum is fading even among the largest holders. Recent-year filings from JFE Steel, Baoshan Iron & Steel and Ansteel are all down year-on-year, with some assignees showing no filings at all in the latest year — a sign the core process routes are largely staked out.
Filing growth compares 2021 (126 records) with 2024 (89) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 2,229 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This dataset tracks patent families filed against continuous casting, hot rolling scale-up, continuous annealing lines and mass production processes for advanced high-strength steel (AHSS), spanning IPC classes C21D8, B21B and C21D9. It captures the process engineering layer that sits between laboratory-grade alloy development and plant-scale output — the step where a steel chemistry becomes a manufacturable product.
Coverage runs from 2015 through the 2026 data cut-off. Because publication typically lags filing by around 18 months, the last one to two years of filings shown here are undercounts and will rise as later applications publish.
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Filing trend and technology composition
Two views of the same 2,229-family dataset: how filing volume has moved year over year, and how the classification codes on those filings split across heat treatment, alloying, casting and coating.
A peak in 2019, then a plateau
Filings ran at 162 in 2017, rose to a peak of 186 in 2019, and sat at 134 by the 2022 midpoint — a pattern of flat-to-declining activity rather than sustained growth, consistent with a process area where the dominant routes are already claimed.
Heat treatment and alloy chemistry crowd out the hardware side
C21D (heat treatment) appears on 2,159 records and C22C (alloys) on 2,154 — together they cover almost the entire dataset. B21B (metal rolling), B22D (metal casting), B32B (laminates), C21C (steelmaking) and C25D (electroplating) each cover a small fraction, pointing to comparatively thin claim coverage on the physical processing hardware relative to the metallurgy itself.
Shares are the percentage of the 2,229 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Advanced High-Strength Steel Scale-Up and Mass Production with Eureka
This page is one run against one query. Ask Eureka your own question about advanced high-strength steel scale-up and mass production and every answer comes back with the patent numbers behind it.
Try EurekaThe records other filings cite most
Ultra-high-strength steel having excellent plasticity and method for manufacturing same (US20230272511A1)
Baoshan Iron & Steel's filing claims a specific carbon-manganese-silicon-aluminium composition window together with a thin-slab continuous casting and hot-rolling route that caps surface oxide scale thickness and the FeO/Fe3O4 fraction within that scale — tying a plasticity result directly to a controlled scale-management process step.Abstract excerpted from the published filing.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | EP0969112A1 | Dual-phase high-strength steel sheet having excellent dynamic deformation properties and process for preparin… | 92 |
| 2 | CN100435987C | 一种基于薄板坯连铸连轧流程采用Ti微合金化工艺生产700MPa级高强耐候钢的方法 | 81 |
| 3 | EP0867520A2 | Welded high-strength steel structures and methods of manufacturing the same | 76 |
| 4 | US20090010793A1 | Method For Producing High Strength Steel Strips or Sheets With Twip Properties, Method For Producing a Compon… | 71 |
| 5 | US20030217795A1 | High-strength steel sheet and high-strength steel pipe excellent in deformability and method for producing th… | 57 |
| 6 | EP1354973A1 | High-strength steel sheet and high-strength pipe excellent in deformability and method for producing the same | 56 |
| 7 | EP3144406A1 | High-strength cold rolled steel sheet having excellent ductility, hot-dip galvanized steel sheet and method f… | 55 |
| 8 | CN103451562A | 水电用调质型大厚度易焊接Z向高强度钢板及其生产方法 | 54 |
| 9 | EP0974677A1 | High-strength steel sheet highly resistant to dynamic deformation and excellent in workability and process fo… | 50 |
| 10 | CN102181794A | 人造板设备用调质高强度钢板及其生产方法 | 46 |
Citation counts reflect influence within this searched corpus and skew toward older filings; they are not a measure of current commercial importance.
Patent titles are shown in the language they were filed in, not translated, so that each record stays verifiable against the original filing — a translated title will not match in Eureka or in any national register. Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers indicate for filing strategy
Three patterns stand out once filing volume, classification spread and citation weight are read together.
The growth phase has passed
Filing activity peaked in 2019 at 186 records and had eased to 134 by 2022, with 2026 figures still partial. New entrants filing broad process claims now compete against an already-dense prior art base rather than open ground.
Heat treatment claims are the densest layer
Nearly every record in this set touches heat treatment (C21D) or alloy composition (C22C). Casting (B22D) and rolling (B21B) subclasses are present on a much smaller share of filings, suggesting the process-hardware integration layer carries less claim density than the metallurgy layer above it.
Influence sits with older dual-phase and TWIP filings
The most-cited records date to dual-phase steel sheet and TWIP-property production methods rather than recent scale-up filings. Citation counts here reward age and foundational status, not the current state of the art.
Cross-filing is rare and concentrated
Only ten co-assignee pairs appear across the dataset, and the strongest link — between two related Nippon Steel entities — still represents a small fraction of total filings. Most organisations here file independently rather than through joint ventures or research partnerships.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to advanced high-strength steel scale-up and mass production, with the prior art for and against each one.
Who is filing, and where momentum is heading
Filing counts identify the largest holders, but recent-year momentum tells a sharper story: several of the biggest names have slowed to a trickle of filings or stopped entirely in the latest reported year.
Large Japanese producers are pulling back
JFE Steel filed just 1 record in the latest year, down 93% year-on-year. Nippon Steel and its Sumitomo Metal-linked entity show no filings at all in the latest year, despite being the strongest co-assignee pair in the dataset historically.
POSCO shows zero recent filings
POSCO's latest-year count sits at 0, a full drop from the prior year. Combined with declines at Ansteel (-88%) and Baoshan (-50%), the pattern across major steelmakers points to a maturing claim position rather than active expansion.
Chinese producers pair with research institutes
Hunan Valin Xiangtan Iron & Steel co-files with both a construction-machinery group and Central South University, each at 3 shared families — a research-partnership pattern not mirrored among the Japanese or Korean majors in this set.
| Assignee | Recent year | YoY |
|---|---|---|
| JFE Steel Corporation | 1 | -93% |
| Baoshan Iron & Steel Co., Ltd. | 1 | -50% |
| Angang Steel Company Limited (Ansteel) | 1 | -88% |
| POSCO | 0 | -100% |
| Nippon Steel Corporation | 0 | — |
| NIPPON STEEL & SUMITOMO METAL CORP | 0 | — |
| Kobe Steel, Ltd. | 0 | -100% |
| Hunan Valin Xiangtan Iron & Steel Co., Ltd. | 0 | -100% |
Where to take this analysis
The dataset points to a mature claim landscape on core metallurgy and a thinner one on process hardware. Two directions follow from that.
Map the white space before drafting
Casting, rolling and coating subclasses carry a fraction of the filing density of heat treatment and alloy claims. Run a focused search on those subclasses against your specific process step before assuming freedom to operate.
Explore white space in EurekaTrack momentum, not just volume
Several of the largest historical filers have slowed sharply in the latest reported year. A rankings table alone would miss this; year-on-year momentum by assignee is the more current signal.
Monitor assignee momentum in EurekaCommon questions on AHSS scale-up patents
In this landscape, it refers to patent families claiming the process engineering needed to move an AHSS grade from lab-scale composition to plant-scale output — continuous casting, hot rolling scale-up, continuous annealing lines and mass production methods, classified under IPC C21D8, B21B and C21D9. It excludes pure alloy-composition claims that make no process-scale claim. The distinction matters because a strong composition claim does not necessarily block a competing production route, and vice versa.
Filing volume peaked at 186 in 2019 and had eased to 134 by the 2022 midpoint, with later years still under-reported due to publication lag. A plateau or decline after a peak typically signals that the dominant process routes — thin-slab casting, standard continuous annealing configurations — are already well claimed by incumbents, so new filers face a denser prior art field and often narrow their claims rather than file broad process patents.
Filing activity concentrates among major Japanese, Korean and Chinese steelmakers, with Nippon Steel and its Sumitomo Metal-linked entity forming the strongest co-assignee pair in the dataset. However, recent-year momentum for several of these same companies — including JFE Steel, Baoshan Iron & Steel, Ansteel and POSCO — has turned sharply negative, some dropping to zero filings in the latest year, so historical share does not necessarily predict current filing activity.
The IPC composition shows heat treatment (C21D) and alloys (C22C) covering nearly the entire dataset, while metal rolling (B21B), casting (B22D), laminates (B32B), steelmaking (C21C) and electroplating (C25D) each cover a much smaller share of records. That gap suggests the specific hardware and process-control claims around casting, rolling integration and coating adhesion for AHSS carry thinner coverage than the underlying metallurgy, making them a more promising area to search before drafting a new claim.
This Baoshan Iron & Steel filing claims an ultra-high-strength steel with a specific compositional window (carbon 0.26-0.30 wt%, silicon 0.8-1.00 wt%, manganese 2.80-3.30 wt%, aluminium 0.04-0.08 wt%) manufactured through thin-slab continuous casting and hot rolling with a controlled oxide scale thickness of 6 micrometres or less and a capped FeO/Fe3O4 fraction within that scale. It ties a plasticity outcome to that specific scale-management step, so it is narrower than a general composition or general casting claim — competitors working outside that compositional window or that scale-thickness control are less likely to be blocked by it.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.