Steel ASP 2030 HT-66
Hardness band
HT-66 = hardened 1150 °C + triple tempered 560 °C
Standard working hardness for hobs, milling cutters, broaches and drills — best wear/toughness balance.
Values for the HT-66 condition
Other ASP 2030 tempers and conditions
ASP 2030 is listed in 4 conditions; see the grade overview at ASP 2030.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ANNDefault Annealed | Standard delivery condition for bar, flat and blanks — machine to shape in this state before hardening. | 600 | 950 | 12 | 300 HB | 24 W/m·K |
Hardened 1050–1100 °C + triple tempered 560 °C | Toughness-biased hardening level for interrupted cuts, punches and cold-work tooling. | — | 2,300 | — | 64 HRC | — |
Hardened 1180 °C + triple tempered 550–560 °C | Maximum hardness / red-hardness setting for high-speed cutting of hard workpieces; lowest toughness. | — | 2,300 | — | 67 HRC | — |
HT-66This page Hardened 1150 °C + triple tempered 560 °C | Standard working hardness for hobs, milling cutters, broaches and drills — best wear/toughness balance. | — | 2,400 | — | 66 HRC | — |
What is ASP 2030 HT-66?
ASP 2030 HT-66 is ASP 2030 heat treated to HT-66 — standard working hardness for hobs, milling cutters, broaches and drills — best wear/toughness balance. ASP 2030 HT-66 has a yield strength of 600 MPa (87 ksi) and a tensile strength of 2,400 MPa (348 ksi) — stronger than 77% of steel grades. Elongation at break is 12% and the elastic modulus is 230 GPa (33.4 Msi). ASP 2030 HT-66 has a density of 8 g/cm³ (0.289 lb/in³), heavier than 95% of steel grades. It melts at 1,250°C (2,282 °F). ANN is the default condition FabDigit quotes; HT-66 is available on request or by drawing note.
Advantages
- Polishes to a fine finish — 80/100, better than 97% of steel grades
- High service temperature — 560°C (1,040 °F), better than 96% of steel grades
- High strength — 600 MPa (87 ksi), better than 77% of steel grades
Limitations
- Difficult to machine — 5/100, worse than 100% of steel grades
- Low fracture toughness — 20 MPa·√m (18.2 ksi·√in), worse than 99% of steel grades
- Limited formability — 8/100, worse than 97% of steel grades
- High embodied carbon — 5.5 kg CO₂/kg, worse than 97% of steel grades
- Poor heat conductor — 24 W/m·K (13.9 BTU/hr·ft·°F), worse than 90% of steel grades
ASP 2030 HT-66 properties
Typical room-temperature values for ASP 2030 HT-66; 10 are specific to this condition. Other listed values are ASP 2030 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
ASP 2030 HT-66 has a density of 8 g/cm³ (0.289 lb/in³), heavier than 95% of steel grades. It melts at 1,250°C (2,282 °F).
Mechanical14
ASP 2030 HT-66 has a yield strength of 600 MPa (87 ksi) and a tensile strength of 2,400 MPa (348 ksi) — stronger than 77% of steel grades. Elongation at break is 12% and the elastic modulus is 230 GPa (33.4 Msi).
Thermal5
ASP 2030 HT-66 is rated for continuous service to 560°C (1,040 °F). It conducts heat at 24 W/m·K (13.9 BTU/hr·ft·°F), worse than 90% of steel grades. Thermal expansion is 10.8 µm/m·K (6 µin/in·°F).
Electrical2
ASP 2030 HT-66 has an electrical resistivity of 5.5×10⁻⁷ Ω·m.
Chemical & Environmental2
Corrosion resistance is poor (15/100), better than 75% of steel grades.
Sustainability4
Producing a kilogram of ASP 2030 HT-66 takes about 70 MJ of energy and emits 5.5 kg of CO₂ — more than 97% of steel grades. Typical recycled content is 25%.
Manufacturability6
ASP 2030 HT-66's machinability is not recommended (5/100, worse than 100% of steel grades); weldability poor (20/100); formability not recommended (8/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ASP 2030 HT-66
Is ASP 2030 easy to machine?
Machine only in the soft-annealed state with rigid setups, sharp carbide or cobalt-HSS tooling and low speeds; after hardening use CBN/diamond grinding, EDM or wire EDM (stress-relieve or re-temper after EDM).
Can ASP 2030 be welded?
Not a structural weld metal — repair only, with 450–500 °C preheat, matching HSS filler, and immediate tempering at 550–560 °C to avoid quench cracks.
Can ASP 2030 be formed, bent or molded?
Hot forge 1050–1150 °C with slow controlled cooling and full soft anneal (850–900 °C, slow cool) afterwards; no cold forming.
What surface finishes work on ASP 2030?
Takes a fine mirror polish thanks to the small, evenly distributed PM carbides; typically finished with steam oxide, nitriding or PVD TiN/TiAlN, and must be oiled or coated because it offers no inherent corrosion resistance.
ASP 2030 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Chigh C to form MC/M6C carbides | 1.2 – 1.35 | 1.28 |
| Cr | 3.8 – 4.5 | 4.2 |
| Mo | 4.7 – 5.3 | 5 |
| W | 6 – 6.8 | 6.4 |
| VMC carbides for wear resistance | 2.9 – 3.3 | 3.1 |
| Coraises hot hardness / tempering resistance | 8 – 8.8 | 8.5 |
| Si | ≤ 0.6 | 0.3 |
| Mn | ≤ 0.6 | 0.3 |
| Fe | balance | — |
ASP 2030 HT-66 — frequently asked
What is ASP 2030 HT-66 used for?
ASP 2030 HT-66 is typically used for cutting tools, cold-work rolls and punches. In short: balanced-toughness PM high-speed steel; mirror-polishable PM carbides; grind or EDM after hardening.
What is the yield strength of ASP 2030 HT-66?
ASP 2030 HT-66 has a typical yield strength of 600 MPa (87 ksi) and a tensile strength of 2,400 MPa (348 ksi) — stronger than 77% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is ASP 2030 HT-66 easy to machine?
Not especially — machinability is rated not recommended (5/100, worse than 100% of steel grades). Machine only in the soft-annealed state with rigid setups, sharp carbide or cobalt-HSS tooling and low speeds; after hardening use CBN/diamond grinding, EDM or wire EDM (stress-relieve or re-temper after EDM).
Can ASP 2030 HT-66 be welded?
Not readily — weldability is rated poor (20/100). Not a structural weld metal — repair only, with 450–500 °C preheat, matching HSS filler, and immediate tempering at 550–560 °C to avoid quench cracks.
What surface finishes work on ASP 2030 HT-66?
Takes a fine mirror polish thanks to the small, evenly distributed PM carbides; typically finished with steam oxide, nitriding or PVD TiN/TiAlN, and must be oiled or coated because it offers no inherent corrosion resistance.
Can ASP 2030 HT-66 be formed, bent or molded?
Hot forge 1050–1150 °C with slow controlled cooling and full soft anneal (850–900 °C, slow cool) afterwards; no cold forming.
What is the maximum service temperature of ASP 2030 HT-66?
ASP 2030 HT-66 is rated for continuous use to about 560°C (1,040 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- ASP 2030 powder metallurgical high speed steel data sheet — Erasteel (2020)
- ASM Handbook Vol. 1: Properties and Selection — Irons, Steels and High-Performance Alloys (High-Speed Tool Steels) — ASM International (1990)
- ASTM A600 / ISO 4957 — Tool steels (M3 class 2 chemistry reference) — ASTM / ISO (2018)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.