Tool Steel · Cold Work Tool Steel
Steel A3
Steel A3 is a tool steel steel — air-hardening cold-work tool. Typical values: 780 MPa yield, 7.86 g/cm³, rated to 200 °C. Available for CNC machining at FabDigit.
Properties
Typical room-temperature values for the default supply condition. Metric first, imperial in gray. The bars show where A3 sits against the other 317 steel grades in the catalog.
Datasheet
| Yield strength | 780 MPa113 ksi |
|---|---|
| Tensile strength | 1,750 MPa254 ksi |
| Hardness | 61 HRC≈ 671 HB |
| Density | 7.86 g/cm³0.284 lb/in³ |
| Specific strength (yield ÷ density) | 99 |
| Min service temp | -40 °C-40 °F |
| Max service temp | 200 °C392 °F |
| Electrical conductivity | 5.2 % IACS3 MS/m |
| Machinability | Poor28 / 100 |
| Weldability | Poor15 / 100 |
| Formability | Not recommended10 / 100 |
| ISO 513 machining group | P |
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Against other steel grades
Strength versus weight in the steel family
Yield strength against density for every steel grade FabDigit runs. A3 is highlighted; hover a dot for its name, or open the interactive family chart.
Manufacturability
The process limits FabDigit's quote engine applies to A3. Design inside these and the part quotes instantly; outside them it routes to an engineer.
CNC machining
| Machinability | Fair28 / 100 |
|---|---|
| ISO material group | P.2 |
| Cutting speed (rough / finish) | 175 / 205 m/min |
| Minimum wall | 0.8 mm |
| Minimum internal radius | 1 mm |
| Drill depth limit | 5× diameter |
| Best surface (machined / polished) | Ra 1.6 / — |
| Hardenable after machining | No |
Surface finishes for A3
Coatings and treatments compatible with steel on the processes A3 runs on. Pick them in the quote configurator or call them out on the drawing.
Plating
- Chrome Plating
- Copper Plating
- Electroless Nickel (EN)
- Gold Plating
- Hard Chrome Plating
- Hot-Dip Galvanizing
- Nickel Plating
- Silver Plating
- Tin Plating
- Zinc Plating
- Zinc-Flake (Dip-Spin) Coating
- Zinc-Nickel Plating
PVD Coating
- AlCrN
- AlTiN
- CrN
- DLC
- MoS2
- TiAlN
- TiB2
- TiCN
- TiN
- WC/C
- ZrN
Organic Coating
- Cerakote
- E-Coating
- Epoxy Coating
- Painting
- Powder Coating
- PTFE Coating
CVD Coating
- CVD Al2O3
- CVD TiCN
- CVD TiN
- Multilayer CVD
Marking / Decoration
- Chemical Etching
- Dot Peen Marking
- Electro-chemical Etching
- Ink Stamping
- Laser Marking
- Mechanical Engraving
- Steel Stamping
- Vibro Engraving / Scribing
Black / Phosphate
- Black Oxide
- Manganese Phosphate
- Zinc Phosphate
Thermal Spray
- HVOF Coating
- Plasma Spray
Equivalent designations
Standards and trade names that resolve to Steel A3 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- T30103
- Also called
- A3 Tool SteelAir-Hardening Tool Steel
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.