Steel H10-QT4852
Hardness band
AISI/SAE H10 · UNS T20810
QT4852 = q&T 48–52 HRC
Use for hot punches, mandrels and shear blades where abrasion and hot compressive strength matter more than impact toughness.
Values for the QT4852 condition
Other H10 tempers and conditions
H10 is listed in 6 conditions; see the grade overview at H10.
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 |
QT4852This page 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-QT4852?
H10-QT4852 is H10 heat treated to QT4852 — use for hot punches, mandrels and shear blades where abrasion and hot compressive strength matter more than impact toughness. H10-QT4852 has a yield strength of 1,520 MPa (220 ksi) and a tensile strength of 1,800 MPa (261 ksi) — stronger than 97% of steel grades. Elongation at break is 7% and the elastic modulus is 210 GPa (30.5 Msi). H10-QT4852 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). ANN is the default condition FabDigit quotes; QT4852 is available on request or by drawing note.
Advantages
- High strength — 1,520 MPa (220 ksi), better than 97% of steel grades
- 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
- Good corrosion resistance — 26/100, better than 93% of steel grades
Limitations
- Limited formability — 2/100, worse than 100% of steel grades
- Difficult to machine — 15/100, worse than 98% of steel grades
- Limited ductility — 7%, worse than 96% of steel grades
- High embodied carbon — 2.6 kg CO₂/kg, worse than 87% of steel grades
- Poor heat conductor — 27 W/m·K (15.6 BTU/hr·ft·°F), worse than 86% of steel grades
H10-QT4852 properties
Typical room-temperature values for H10-QT4852; 20 are specific to this condition. Other listed values are H10 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
H10-QT4852 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-QT4852 has a yield strength of 1,520 MPa (220 ksi) and a tensile strength of 1,800 MPa (261 ksi) — stronger than 97% of steel grades. Elongation at break is 7% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
H10-QT4852 is rated for continuous service to 560°C (1,040 °F). It conducts heat at 27 W/m·K (15.6 BTU/hr·ft·°F), worse than 86% of steel grades. Thermal expansion is 11.5 µm/m·K (6.39 µin/in·°F).
Electrical3
H10-QT4852 conducts electricity at 3.3 % IACS, worse than 86% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (26/100), better than 93% of steel grades.
Sustainability4
Producing a kilogram of H10-QT4852 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-QT4852's machinability is poor (15/100, worse than 98% of steel grades); weldability poor (25/100); formability not recommended (2/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with H10-QT4852
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.
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.
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 | — |
H10-QT4852 — frequently asked
What is H10-QT4852 used for?
H10-QT4852 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-QT4852?
H10-QT4852 has a typical yield strength of 1,520 MPa (220 ksi) and a tensile strength of 1,800 MPa (261 ksi) — stronger than 97% of steel grades. Strength varies by condition: see the 6 listed tempers.
Is H10-QT4852 easy to machine?
Not especially — machinability is rated poor (15/100, worse than 98% 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-QT4852 be welded?
Not readily — weldability is rated poor (25/100). 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-QT4852?
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-QT4852 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-QT4852?
H10-QT4852 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.
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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.