Steel 4Cr5MoSiV Nitrided
Finish state
GB 4Cr5MoSiV · AISI/SAE H11
Gas/plasma nitrided at 480–530 °C for extrusion dies and cores needing a wear- and soldering-resistant skin.
Values for the Nitrided condition
Other 4Cr5MoSiV tempers and conditions
4Cr5MoSiV is listed in 8 conditions; see the grade overview at 4Cr5MoSiV.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Electroslag remelted, annealed | Pick for large die-casting blocks, mirror-polished cavities and where NADCA-type cleanliness/isotropy is specified. | 490 | 760 | 24 | 14 HRC | 3.3 % IACS |
AnnealedDefault spheroidize annealed bar/plate (≤229 HB) | Standard as-supplied condition for machining before hardening; virtually all mill stock ships this way. | 500 | 780 | 22 | 210 HB | — |
Hot rolled | Cheapest mill form for large blocks that will be annealed and machined by the tool shop. | 700 | 1,000 | 14 | 31 HRC | 3.3 % IACS |
hardened and high-temper (max toughness) | Choose for large forging dies, die-casting holder blocks and shock-loaded tooling where cracking risk dominates over wear. | 1,150 | 1,350 | 13 | 42 HRC | — |
standard die-casting / extrusion die hardness | The default working hardness for aluminium die-casting dies and hot extrusion tooling — best balance of heat-check resistance and strength. | 1,300 | 1,550 | 11 | 46 HRC | — |
NitridedThis page Nitrided surface (core Q&T 44–48 HRC) | Gas/plasma nitrided at 480–530 °C for extrusion dies and cores needing a wear- and soldering-resistant skin. | 1,350 | 1,550 | 8 | 46 HRC | 3.3 % IACS |
hardened and low-temper (max wear resistance) | For punches, shear blades, mandrels and small inserts where wear and compressive strength matter more than impact toughness. | 1,520 | 1,800 | 9 | 50 HRC | — |
maximum attainable working hardness | Only for small, well-supported wear parts; toughness is low and cracking risk in service is high. | 1,650 | 1,950 | 7 | 54 HRC | — |
What is 4Cr5MoSiV Nitrided?
4Cr5MoSiV Nitrided is 4Cr5MoSiV supplied in the Nitrided condition — gas/plasma nitrided at 480–530 °C for extrusion dies and cores needing a wear- and soldering-resistant skin. 4Cr5MoSiV Nitrided has a yield strength of 1,350 MPa (196 ksi) and a tensile strength of 1,550 MPa (225 ksi) — stronger than 95% of steel grades. Elongation at break is 8% and the elastic modulus is 210 GPa (30.5 Msi). 4Cr5MoSiV Nitrided has a density of 7.8 g/cm³ (0.282 lb/in³), lighter than 87% of steel grades. It melts at 1,420°C (2,588 °F). Annealed is the default condition FabDigit quotes; Nitrided is available on request or by drawing note.
Advantages
- High strength — 1,350 MPa (196 ksi), better than 95% of steel grades
- Polishes to a fine finish — 78/100, better than 95% of steel grades
- Good corrosion resistance — 28/100, better than 94% of steel grades
- High service temperature — 540°C (1,004 °F), better than 93% of steel grades
Limitations
- Difficult to machine — 5/100, worse than 100% of steel grades
- Difficult to weld — 5/100, worse than 100% of steel grades
- Limited formability — 3/100, worse than 99% of steel grades
- Limited ductility — 8%, worse than 95% of steel grades
- Poor heat conductor — 24.5 W/m·K (14.2 BTU/hr·ft·°F), worse than 89% of steel grades
4Cr5MoSiV Nitrided properties
Typical room-temperature values for 4Cr5MoSiV Nitrided; 22 are specific to this condition. Other listed values are 4Cr5MoSiV reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
4Cr5MoSiV Nitrided has a density of 7.8 g/cm³ (0.282 lb/in³), lighter than 87% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical15
4Cr5MoSiV Nitrided has a yield strength of 1,350 MPa (196 ksi) and a tensile strength of 1,550 MPa (225 ksi) — stronger than 95% of steel grades. Elongation at break is 8% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
4Cr5MoSiV Nitrided is rated for continuous service to 540°C (1,004 °F). It conducts heat at 24.5 W/m·K (14.2 BTU/hr·ft·°F), worse than 89% of steel grades. Thermal expansion is 11.9 µm/m·K (6.61 µin/in·°F).
Electrical3
4Cr5MoSiV Nitrided conducts electricity at 3.3 % IACS, worse than 86% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (28/100), better than 94% of steel grades.
Sustainability4
Producing a kilogram of 4Cr5MoSiV Nitrided takes about 34 MJ of energy and emits 2.5 kg of CO₂ — more than 82% of steel grades. Typical recycled content is 45%.
Manufacturability8
4Cr5MoSiV Nitrided's machinability is not recommended (5/100, worse than 100% of steel grades); weldability not recommended (5/100); formability not recommended (3/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 4Cr5MoSiV Nitrided
Is 4Cr5MoSiV easy to machine?
Machine in the annealed condition (≤229 HB) with rigid setups and coated carbide; above 45 HRC switch to hard milling/EDM plus a stress-relief temper before final heat treatment.
Can 4Cr5MoSiV be welded?
Weldable for repair only with matching H11/H13 filler: preheat and hold at 300–400 °C, weld continuously, slow cool, then temper 20–30 °C below the last tempering temperature.
Can 4Cr5MoSiV be formed, bent or molded?
Hot work at 1050–1120 °C finishing above 900 °C with slow furnace cooling; cold forming is not practical — austenitize 1000–1030 °C, air/vacuum quench, and double or triple temper at 540–620 °C.
What surface finishes work on 4Cr5MoSiV?
Takes a high polish (best with ESR stock); protect service surfaces by nitriding, oxidation/blackening or PVD CrN/AlTiN — no anodizing, and hard chrome may spall under thermal cycling.
4Cr5MoSiV 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 |
|---|---|---|
| C | 0.33 – 0.43 | 0.38 |
| Si | 0.8 – 1.2 | 1 |
| Mn | 0.2 – 0.5 | 0.35 |
| Cr | 4.75 – 5.5 | 5.1 |
| Mo | 1.1 – 1.6 | 1.35 |
| V | 0.3 – 0.6 | 0.45 |
| P | ≤ 0.03 | — |
| Smax; premium/ESR often ≤0.005 | ≤ 0.03 | — |
| Niresidual, max | ≤ 0.3 | — |
| Curesidual, max | ≤ 0.25 | — |
| Fe | balance | — |
4Cr5MoSiV Nitrided — frequently asked
What is 4Cr5MoSiV Nitrided used for?
4Cr5MoSiV Nitrided is typically used for die-casting dies, forging dies and hot shear blades. In short: tougher than H13; lower-carbon hot-work grade; polishes well in ESR quality.
What is the yield strength of 4Cr5MoSiV Nitrided?
4Cr5MoSiV Nitrided has a typical yield strength of 1,350 MPa (196 ksi) and a tensile strength of 1,550 MPa (225 ksi) — stronger than 95% of steel grades. Strength varies by condition: see the 8 listed tempers.
Is 4Cr5MoSiV Nitrided easy to machine?
Not especially — machinability is rated not recommended (5/100, worse than 100% of steel grades). Machine in the annealed condition (≤229 HB) with rigid setups and coated carbide; above 45 HRC switch to hard milling/EDM plus a stress-relief temper before final heat treatment.
Can 4Cr5MoSiV Nitrided be welded?
Not readily — weldability is rated not recommended (5/100). Weldable for repair only with matching H11/H13 filler: preheat and hold at 300–400 °C, weld continuously, slow cool, then temper 20–30 °C below the last tempering temperature.
What surface finishes work on 4Cr5MoSiV Nitrided?
Takes a high polish (best with ESR stock); protect service surfaces by nitriding, oxidation/blackening or PVD CrN/AlTiN — no anodizing, and hard chrome may spall under thermal cycling.
Can 4Cr5MoSiV Nitrided be formed, bent or molded?
Hot work at 1050–1120 °C finishing above 900 °C with slow furnace cooling; cold forming is not practical — austenitize 1000–1030 °C, air/vacuum quench, and double or triple temper at 540–620 °C.
What is the maximum service temperature of 4Cr5MoSiV Nitrided?
4Cr5MoSiV Nitrided is rated for continuous use to about 540°C (1,004 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 4Cr5MoSiV Annealed and 4Cr5MoSiV-HR?
Annealed is the default condition — standard as-supplied condition for machining before hardening; virtually all mill stock ships this way. HR: cheapest mill form for large blocks that will be annealed and machined by the tool shop. Yield strength is 500 MPa in Annealed versus 700 MPa in HR.
Sources
- GB/T 1299 (4Cr5MoSiV) — SAC / (2014)
- ASTM A681 Standard Specification for Tool Steels Alloy (H11) — ASTM International (2015)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (Hot-Work Tool Steels) — ASM International (1990)
- Hot work tool steel W300 / H11 datasheet — voestalpine Böhler Edelstahl (2022)
- H11 / 1.2343 hot work die steel technical data — Daido Steel / (2021)
- H11/4Cr5MoSiV — Mysteel / 1688 (2026)
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.