Steel H10
AISI/SAE H10 · UNS T20810
H10 is a chromium-molybdenum-vanadium hot-work tool steel (UNS T20810, 1.2365, X32CrMoV3-3) with good resistance to heat checking and to softening under thermal cycling.
Reference datasheet — H10 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the ANN condition
H10 tempers and conditions
H10 is supplied in 6 conditions, soft to hard. ANN is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ANNDefault Annealed | Standard mill supply condition for bar, plate and forged blocks; machine the die cavity here, then harden. | 500 | 780 | 22 | 210 HB | 30 W/m·K |
ESR (electroslag remelted), annealed | Pick for large die-casting blocks needing isotropic toughness, low inclusion content and mirror polishability. | 500 | 780 | 24 | 14 HRC | 3.3 % IACS |
Q&T 40–44 HRC | Choose for large hot-forging dies and extrusion tooling where impact and gross cracking dominate over wear. | 1,150 | 1,350 | 12 | 42 HRC | 29 W/m·K |
Q&T 44–48 HRC | The usual hardened working condition: best balance of hot strength, heat-checking resistance and toughness for Al die-casting dies. | 1,350 | 1,570 | 10 | 46 HRC | 28 W/m·K |
Q&T 48–52 HRC | Use for hot punches, mandrels and shear blades where abrasion and hot compressive strength matter more than impact toughness. | 1,520 | 1,800 | 7 | 50 HRC | 27 W/m·K |
As-quenched | Transient condition only — must be tempered immediately; never used in service because of retained austenite and quench stresses. | 1,550 | 2,000 | 2 | 55 HRC | 3 % IACS |
What is H10?
H10 is a chromium-molybdenum-vanadium hot-work tool steel (UNS T20810, 1.2365, X32CrMoV3-3) with good resistance to heat checking and to softening under thermal cycling. It is supplied as annealed bar and plate at about 210 HB (780 MPa tensile) and quenched and tempered to roughly 40–52 HRC, with ESR-annealed material available for cleaner, more uniform heavy sections. Thermal conductivity is about 30 W/m·K and the service temperature reaches about 500 °C. It is not stainless, and hardened tooling above roughly 45 HRC must be finished by EDM, grinding or CBN. H13 is the nearest alternative for general die-casting tooling. H10 has a density of 7.81 g/cm³ (0.282 lb/in³), lighter than 84% of steel grades. It melts at 1,425°C (2,597 °F). H10 has a yield strength of 500 MPa (72.5 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 63% of steel grades. Elongation at break is 22% and the elastic modulus is 210 GPa (30.5 Msi).
What is H10 used for?
- die-casting dies
- hot forging dies
- extrusion tooling
- mandrels
Advantages
- High service temperature — 500°C (932 °F), better than 90% of steel grades
- Good corrosion resistance — 22/100, better than 90% of steel grades
- Polishes to a fine finish — 70/100, better than 87% of steel grades
Limitations
- High embodied carbon — 2.6 kg CO₂/kg, worse than 87% of steel grades
- Low electrical conductivity — 3.3 % IACS, worse than 86% of steel grades
- Poor heat conductor — 30 W/m·K (17.3 BTU/hr·ft·°F), worse than 83% of steel grades
H10 properties
Typical room-temperature values for H10-ANN; bars are the position among steel grades.
Physical3
H10 has a density of 7.81 g/cm³ (0.282 lb/in³), lighter than 84% of steel grades. It melts at 1,425°C (2,597 °F).
Mechanical14
H10 has a yield strength of 500 MPa (72.5 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 63% of steel grades. Elongation at break is 22% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
H10 is rated for continuous service to 500°C (932 °F). It conducts heat at 30 W/m·K (17.3 BTU/hr·ft·°F), worse than 83% of steel grades. Thermal expansion is 11.5 µm/m·K (6.39 µin/in·°F).
Electrical3
H10 conducts electricity at 3.3 % IACS, worse than 86% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (22/100), better than 90% of steel grades.
Sustainability4
Producing a kilogram of H10 takes about 34 MJ of energy and emits 2.6 kg of CO₂ — more than 82% of steel grades. Typical recycled content is 45%.
Manufacturability7
H10's machinability is good (55/100, better than 62% of steel grades); weldability fair (45/100); formability poor (25/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the steel family
Yield strength against density for every steel grade FabDigit runs. H10 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with H10
Is H10 easy to machine?
Machine fully in the annealed condition with rigid setups and carbide tooling; after hardening above ~45 HRC use EDM, grinding or ceramic/CBN tools and stress-relieve after EDM.
Can H10 be welded?
Weldable for die repair with matched hot-work filler at 300–350 °C preheat, interpass held above preheat, slow cool and a temper 20–30 °C below the last tempering temperature.
Can H10 be formed, bent or molded?
Hot-work only: forge at 1050–1150 °C, stop above ~900 °C and slow-cool/anneal at 800–860 °C; cold forming is not practical.
H10 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 |
|---|---|---|
| CASTM A681 H10; DIN 1.2365 is leaner at 0.28–0.35 C | 0.35 – 0.45 | 0.4 |
| Si1.2365 typically 0.10–0.40 Si | 0.8 – 1.2 | 1 |
| Mn | 0.25 – 0.7 | 0.4 |
| Cr | 3 – 3.75 | 3.3 |
| Mosecondary hardening / hot strength | 2 – 3 | 2.5 |
| Vgrain refinement, wear resistance | 0.25 – 0.75 | 0.45 |
| Niresidual max | ≤ 0.3 | |
| Curesidual max | ≤ 0.25 | |
| P | ≤ 0.03 | |
| S | ≤ 0.03 | |
| Fe | balance |
What surface finishes work on H10?
Nitride, gas nitrocarburize or PVD-coat working faces for soldering and erosion resistance; polish/EDM-skin removal before nitriding; keep oiled since the steel is not stainless.
Surface treatments FabDigit runs on steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Organic Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Steel H10 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- T20810
- Similar grades
- 1.2365X32CrMoV3-3
How much does H10 cost?
H10 is a premium-cost steel ($$$), cheaper than about 51% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
H10 — frequently asked
What is H10 used for?
H10 is typically used for die-casting dies, hot forging dies, extrusion tooling and mandrels. In short: cr-Mo-V hot-work grade; good heat-check resistance; 500 °C service capability.
What is the yield strength of H10?
H10 has a typical yield strength of 500 MPa (72.5 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 63% of steel grades. Strength varies by condition: see the 6 listed tempers.
Is H10 easy to machine?
Reasonably — machinability is rated good (55/100, better than 62% of steel grades). Machine fully in the annealed condition with rigid setups and carbide tooling; after hardening above ~45 HRC use EDM, grinding or ceramic/CBN tools and stress-relieve after EDM.
Can H10 be welded?
With care — weldability is rated fair (45/100). Weldable for die repair with matched hot-work filler at 300–350 °C preheat, interpass held above preheat, slow cool and a temper 20–30 °C below the last tempering temperature.
What surface finishes work on H10?
Nitride, gas nitrocarburize or PVD-coat working faces for soldering and erosion resistance; polish/EDM-skin removal before nitriding; keep oiled since the steel is not stainless.
Can H10 be formed, bent or molded?
Hot-work only: forge at 1050–1150 °C, stop above ~900 °C and slow-cool/anneal at 800–860 °C; cold forming is not practical.
What is the maximum service temperature of H10?
H10 is rated for continuous use to about 500°C (932 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between H10-ANN and H10-AQ?
ANN is the default condition — standard mill supply condition for bar, plate and forged blocks; machine the die cavity here, then harden. AQ: transient condition only — must be tempered immediately; never used in service because of retained austenite and quench stresses. Yield strength is 500 MPa in ANN versus 1,550 MPa in AQ.
How much does H10 cost?
H10 is a premium-cost steel ($$$), cheaper than about 51% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- ASTM A681 Standard Specification for Tool Steels Alloy — ASTM International (2022)
- EN ISO 4957 Tool steels (X32CrMoV3-3 / 1.2365) — ISO/CEN (2018)
- GB/T 1299 (3Cr3Mo3W2V / 4Cr3Mo3SiV class) — SAC (2014)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (Hot-Work Tool Steels) — ASM International (1990)
- ASM Handbook Vol.4 — Heat Treating of Tool Steels — ASM International (1991)
- 1.2365 / H10 hot-work tool steel datasheet — Böhler / voestalpine (2022)
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.