ZDP-189 Steel: Composition, Hardness and Application Evidence
ZDP-189 is Proterial’s powder-metallurgy stainless blade-steel grade. Its public specification discloses typical carbon and chromium values and separates delivery hardness from hardening hardness. For scissors, the grade name needs a documented maker and model before its material data can support claims about a finished tool, cutting technique or service requirement.
Read a steel claim as a four-layer record
A grade can be useful evidence, but a finished shear adds maker execution, geometry, condition, and service history. Apply to ZDP-189 Steel: Composition, Hardness and Application Evidence
- 01 Identify the grade Use a producer or traceable maker designation.
- 02 Name the source layer Separate mill data, maker data, seller copy, and measurement.
- 03 Record execution Heat treatment, geometry, assembly, and finished-blade values stay model-specific.
- 04 Keep the history Condition, use, care, impacts, and service affect the working edge.
Do not inferOne element, HRC value, country adjective, price tier, or steel name cannot rank sharpness, toughness, corrosion resistance, or service life.
Quick look
Proterial’s ZDP-189 product page supplies a material record. It is useful for identifying the grade and its processing conditions; a finished-scissor specification must come from the maker of that tool. Record the product code, blade construction and document date alongside any material claim.
Manufacturer composition data
The published values are typical carbon 3.00% and chromium 20.00% by mass. Silicon, manganese, nickel, molybdenum, tungsten, vanadium and cobalt are marked undisclosed. The structured composition table on this page preserves that distinction. It does not infer zero values or fill the gaps from a different steel.
An additional chemistry figure in a seller’s listing needs its own source. A historical producer document or a batch certificate may offer different detail, but it should retain its date and material identity. The current public table alone does not establish those extra percentages.
Total chromium content also cannot supply a numerical corrosion ranking for a finished scissor. This entry leaves indicative PREN unavailable because the necessary reported inputs are missing. See the composition guide for the calculation’s scope and why an undisclosed element must not become zero.
Heat Treatment (Proterial specifications)
| Producer field | Published entry |
|---|---|
| Annealing | 900 °C, slow cooling |
| Quenching | 1,000–1,050 °C, air cooling or oil cooling |
| Sub-zero treatment | Included; temperature and duration not specified on this page |
| Tempering | 100–150 °C, air cooling |
| Delivery hardness | ≤321 HBW |
| Hardening hardness | ≥65 HRC |
Source: Proterial ZDP-189, reviewed 30 September 2026. These are producer material entries, not instructions for reheating an assembled scissor. Read the hardening figure with its condition; it is not a finished-model guarantee.
Application wording and scissor evidence
The producer names custom knives and high-quality cutlery tools. Scissors are not explicit in that line. An application list is not an exhaustive compatibility test: its omission cannot prove that the material is unsuitable, that blade contact will cause failure, or that no maker uses it.
Conversely, a generic claim that some premium scissors use ZDP-189 does not identify an actual product. Before adding a model to a comparison, obtain maker documentation connecting the grade to that exact blade or blade layer. No named finished-scissor specification is established by the producer source used here.
Why it matters
Material specifications and tool performance answer different questions. The producer’s hardening figure helps describe the grade’s processing outcome. A test of cutting force, wear, edge damage or service life would need a defined specimen or finished tool and its test conditions. Neither a high hardness value nor a powder route supplies that result by itself.
For a seller’s “ZDP-189 scissor” claim, useful evidence would identify the model, the maker’s material statement, the finished geometry and any hardness specification. Keep each claim attached to its source. A handle inscription or a repeated steel name does not provide the missing processing and performance information.
How it compares
| Comparison question | Evidence needed |
|---|---|
| Is this the same material as another powder steel? | A producer identity or documented relationship, not a similar process label |
| Is the finished blade harder? | Comparable measurements or model-specific statements with their conditions |
| Does it resist corrosion better? | Testing under comparable exposure and material conditions |
| Does its edge last longer? | Identified tools, cutting task, endpoint and comparator |
| Is it suited to a particular technique? | Exact-model design and maker application guidance |
Use the separate SG2, VG-10 and ATS-314 records to compare evidence types. Their grade names and hardness statements should not be substituted for this material’s missing fields.
Trade-offs
The public record establishes a producer identity and selected material data while leaving the finished-scissor questions open. Before purchase, establish the intended application, return terms and available service for the actual tool. Ask the service provider about its geometry and material requirements instead of inferring that only one abrasive can work from the steel name.
Drop damage, chipping and repairability depend on the tool and incident. The producer page does not predict that every ZDP-189 tip will chip rather than bend, or that damage will always be irreparable. An inspected tool needs its own assessment.
Sources
- Proterial: ZDP-189 product page: producer material specification and application list.
- Proterial: Yasugi Specialty Steel catalog: producer catalog context.
Related: Steel Types • SG2 (SPG2) • VG-10 • Cobalt Alloy
See Also
Published material composition
Proterial ZDP-189. Typical producer figures; other listed elements are explicitly undisclosed. Not a heat or lot analysis. Composition source
| Element | Mass % | Value type |
|---|---|---|
| C | 3% | typical |
| Cr | 20% | typical |
| Si | Not disclosed | undisclosed |
| Mn | Not disclosed | undisclosed |
| Ni | Not disclosed | undisclosed |
| Mo | Not disclosed | undisclosed |
| W | Not disclosed | undisclosed |
| V | Not disclosed | undisclosed |
| Co | Not disclosed | undisclosed |
Elements absent from this table are unreported in this source, not zero. These material figures do not identify the chemistry of an individual finished scissor.
Indicative PREN: unavailable. No calculation: Mo, N lacks a published point value or two-sided range. Missing values and one-sided limits are not zero. Calculation and limits.
Sources
1 source- Proterial / Yasugi Specialty Steel (旧日立金属・安来鋼) (Typical chemistry, delivery and hardening conditions, application wording.)
Frequently Asked Questions
4 answers you can open one at a timeWhat composition is published for ZDP-189?
Proterial lists typical carbon at 3.00% and chromium at 20.00%. Its other listed element values are undisclosed. Those omissions are not zero values and do not establish the amounts of molybdenum, tungsten or vanadium.
What is the hardness of ZDP-189?
Proterial lists delivery hardness of ≤321 HBW and hardening hardness of ≥65 HRC. These describe different material conditions and scales. Neither is a measured hardness for every finished ZDP-189 scissor.
Does Proterial recommend ZDP-189 for scissors?
Its published application line names custom knives and high-quality cutlery tools. It does not explicitly name scissors. That omission establishes neither a prohibition nor evidence that a particular scissor exists or is suitable; verify the exact maker and model.
Does ZDP-189 require a fixed sharpening interval or abrasive?
The producer page does not specify a finished-scissor service interval or mandate a particular abrasive. Use the exact tool maker’s service requirements and a provider qualified for its geometry and material.
Comments & questions
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