Steel Cr12 Hot Rolled
Finish state
GB Cr12
Cheapest raw stock form; hard, carbide-networked and internally stressed — must be spheroidize annealed before machining.
Values for the Hot Rolled condition
Other Cr12 tempers and conditions
Cr12 is listed in 5 conditions; see the grade overview at Cr12.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault spheroidize/soft annealed, ≤269 HB (as-supplied bar and plate) | Standard delivery condition for machining and die sinking before hardening. | 480 | 820 | 12 | 22 HRC | — |
Hot RolledThis page Hot Rolled / Forged, untreated (as-rolled black bar) | Cheapest raw stock form; hard, carbide-networked and internally stressed — must be spheroidize annealed before machining. | 800 | 1,100 | 5 | 37 HRC | 2.7 % IACS |
Tempered 350–400 °C for higher toughness | Choose when the tool sees edge chipping or impact and some wear resistance can be traded for toughness. | 1,550 | 1,800 | 2 | 57 HRC | 2.5 % IACS |
Quenched and tempered | General hardened die condition: maximum wear resistance for blanking and drawing tools with modest impact. | 1,700 | 1,950 | 1 | 61 HRC | — |
Hardened + deep cryogenic treatment (−150/−196 °C) + double temper | Used for precision gauges and long-run blanking dies: converts retained austenite for extra 1–2 HRC and better dimensional stability. | 1,900 | 2,100 | 0.5 | 64 HRC | 2.6 % IACS |
What is Cr12 Hot Rolled?
Cr12 Hot Rolled is Cr12 supplied in the Hot Rolled condition — cheapest raw stock form; hard, carbide-networked and internally stressed — must be spheroidize annealed before machining. Cr12 Hot Rolled has a yield strength of 800 MPa (116 ksi) and a tensile strength of 1,100 MPa (160 ksi) — stronger than 86% of steel grades. Elongation at break is 5% and the elastic modulus is 210 GPa (30.5 Msi). Cr12 Hot Rolled has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 95% of steel grades. It melts at 1,400°C (2,552 °F). Annealed is the default condition FabDigit quotes; Hot Rolled is available on request or by drawing note.
Advantages
- Good corrosion resistance — 22/100, better than 90% of steel grades
- Polishes to a fine finish — 70/100, better than 87% of steel grades
- High strength — 800 MPa (116 ksi), better than 86% of steel grades
Limitations
- Difficult to weld — 10/100, worse than 99% of steel grades
- Limited ductility — 5%, worse than 98% of steel grades
- Difficult to machine — 18/100, worse than 97% of steel grades
- Limited formability — 8/100, worse than 97% of steel grades
- Poor heat conductor — 20 W/m·K (11.6 BTU/hr·ft·°F), worse than 96% of steel grades
Cr12 Hot Rolled properties
Typical room-temperature values for Cr12 Hot Rolled; 22 are specific to this condition. Other listed values are Cr12 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
Cr12 Hot Rolled has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 95% of steel grades. It melts at 1,400°C (2,552 °F).
Mechanical13
Cr12 Hot Rolled has a yield strength of 800 MPa (116 ksi) and a tensile strength of 1,100 MPa (160 ksi) — stronger than 86% of steel grades. Elongation at break is 5% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
Cr12 Hot Rolled is rated for continuous service to 200°C (392 °F). It conducts heat at 20 W/m·K (11.6 BTU/hr·ft·°F), worse than 96% of steel grades. Thermal expansion is 11.5 µm/m·K (6.39 µin/in·°F).
Electrical3
Cr12 Hot Rolled conducts electricity at 2.7 % IACS, worse than 96% of steel grades.
Chemical & Environmental2
Corrosion resistance is poor (22/100), better than 90% of steel grades.
Sustainability4
Producing a kilogram of Cr12 Hot Rolled takes about 36 MJ of energy and emits 2.6 kg of CO₂ — more than 89% of steel grades. Typical recycled content is 45%.
Manufacturability8
Cr12 Hot Rolled's machinability is poor (18/100, worse than 97% of steel grades); weldability not recommended (10/100); formability not recommended (8/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Cr12 Hot Rolled
Is Cr12 easy to machine?
Machine only in the annealed state with rigid setups, low speeds and coated carbide/TiAlN tooling; abrasive carbides cause fast edge wear, and above ~58 HRC use CBN grinding or EDM.
Can Cr12 be welded?
Essentially not weldable in service; repair welding requires 400–500 °C preheat, matching high-Cr electrode, immediate post-weld temper and slow cooling to avoid quench cracks.
Can Cr12 be formed, bent or molded?
Hot forge 1050–1100 °C, stop above 900 °C, cool slowly in furnace then spheroidize anneal 840–870 °C; virtually no cold forming capability.
What surface finishes work on Cr12?
Takes a fine ground/lapped finish but coarse carbides limit true mirror polish; protect with nitriding, hard chrome or PVD TiN/CrN and oil rust-preventive during storage.
Cr12 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 |
|---|---|---|
| CGB/T 1299 Cr12 | 2 – 2.3 | 2.15 |
| Cr | 11.5 – 13 | 12.2 |
| Si | 0.1 – 0.4 | 0.3 |
| Mn | 0.15 – 0.4 | 0.3 |
| P | ≤ 0.03 | — |
| S | ≤ 0.03 | — |
| Niresidual, max | ≤ 0.25 | — |
| Curesidual, max | ≤ 0.3 | — |
| Monot intentionally added (unlike Cr12MoV) | ≤ 0.3 | — |
| Fe | balance | — |
Cr12 Hot Rolled — frequently asked
What is Cr12 Hot Rolled used for?
Cr12 Hot Rolled is typically used for cold blanking and piercing dies, thread-rolling dies, wire and tube drawing dies, shear and slitter blades, cold-forming rolls and punches for thin sheet. In short: cold-work die tool.
What is the yield strength of Cr12 Hot Rolled?
Cr12 Hot Rolled has a typical yield strength of 800 MPa (116 ksi) and a tensile strength of 1,100 MPa (160 ksi) — stronger than 86% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is Cr12 Hot Rolled easy to machine?
Not especially — machinability is rated poor (18/100, worse than 97% of steel grades). Machine only in the annealed state with rigid setups, low speeds and coated carbide/TiAlN tooling; abrasive carbides cause fast edge wear, and above ~58 HRC use CBN grinding or EDM.
Can Cr12 Hot Rolled be welded?
Not readily — weldability is rated not recommended (10/100). Essentially not weldable in service; repair welding requires 400–500 °C preheat, matching high-Cr electrode, immediate post-weld temper and slow cooling to avoid quench cracks.
What surface finishes work on Cr12 Hot Rolled?
Takes a fine ground/lapped finish but coarse carbides limit true mirror polish; protect with nitriding, hard chrome or PVD TiN/CrN and oil rust-preventive during storage.
Can Cr12 Hot Rolled be formed, bent or molded?
Hot forge 1050–1100 °C, stop above 900 °C, cool slowly in furnace then spheroidize anneal 840–870 °C; virtually no cold forming capability.
What is the maximum service temperature of Cr12 Hot Rolled?
Cr12 Hot Rolled is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in Cr12 Hot Rolled?
Yes — Cr12 Hot Rolled is available for CNC machining; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- GB/T 1299 (Alloy tool steels) — SAC (2014)
- ASTM A681 Standard Specification for Tool Steels Alloy (D3) — ASTM (2015)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (tool steels) — ASM International (1990)
- ASM Handbook Vol.16 — Machining (tool steel machinability ratings) — ASM International (1989)
- X210Cr12 / 1.2080 cold work tool steel datasheet — Böhler / Voestalpine (2020)
- Cr12/Cr12MoV — Mysteel / 1688 (2025)
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.