Steel 09CuPCrNi
GB 09CuPCrNi
09CuPCrNi is a classic Cu-P-Cr-Ni weathering steel of the Corten type, also designated Q265GNH and comparable to A242.
Reference datasheet — 09CuPCrNi 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 HR condition
09CuPCrNi tempers and conditions
09CuPCrNi is supplied in 5 conditions, soft to hard. HR is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed | Rarely stocked; specify when severe cold forming or flanging of thin weathering sheet is needed. | 260 | 420 | 36 | 120 HB | 8.7 % IACS |
HRDefault Hot rolled | Standard stocked condition for weathering plate, coil and railcar sheet; pick unless low-temperature toughness certification is required. | 300 | 450 | 31 | 135 HB | 8.6 % IACS |
Normalized | Choose for thicker plate needing uniform fine-grain structure and guaranteed low-temperature (-40 °C) impact values. | 315 | 460 | 33 | 140 HB | 8.6 % IACS |
Thermomechanically controlled processed | Use where higher strength plus good toughness and low carbon equivalent for welding are wanted from the same chemistry. | 350 | 490 | 30 | 150 HB | 8.6 % IACS |
Cold rolled | Thin (0.5–3 mm) cold-rolled coil for container and railcar panels needing tight thickness tolerance and smooth surface. | 400 | 520 | 22 | 160 HB | 8.6 % IACS |
Supply forms, finishes and certifications
Ways 09CuPCrNi is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
PRE-RUST | Pre-weathered / pre-rusted | Surface finish |
What is 09CuPCrNi?
09CuPCrNi is a classic Cu-P-Cr-Ni weathering steel of the Corten type, also designated Q265GNH and comparable to A242. Its low carbon and 31 % elongation make it the most formable grade in the weathering family, supplied hot-rolled, normalized, TMCP, cold-rolled, annealed or pre-rusted for bare outdoor service at 300 MPa yield, 450 MPa tensile and 135 HB. Strength is modest, so the newer Q355NH is preferred where higher yield is required, and the elevated phosphorus raises edge-cracking and weld-restraint risk. It is not suitable for marine or permanently wet exposure without coating. 09CuPCrNi has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,460°C (2,660 °F). 09CuPCrNi has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 86% of steel grades. Elongation at break is 31% and the elastic modulus is 206 GPa (29.9 Msi).
What is 09CuPCrNi used for?
- railway hopper cars
- outdoor sculptures
- shipping equipment
Advantages
- Good corrosion resistance — 32/100, better than 96% of steel grades
- Ductile — tolerates forming and impact — 31%, better than 94% of steel grades
- Forms and bends easily — 75/100, better than 90% of steel grades
- Easy to machine — 62/100, better than 89% of steel grades
- Conducts heat well — 48 W/m·K (27.7 BTU/hr·ft·°F), better than 79% of steel grades
Limitations
- Low strength — 300 MPa (43.5 ksi), worse than 86% of steel grades
- Hard to polish — 45/100, worse than 84% of steel grades
09CuPCrNi properties
Typical room-temperature values for 09CuPCrNi-HR; bars are the position among steel grades.
Physical3
09CuPCrNi has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,460°C (2,660 °F).
Mechanical16
09CuPCrNi has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 86% of steel grades. Elongation at break is 31% and the elastic modulus is 206 GPa (29.9 Msi).
Thermal6
09CuPCrNi is rated for continuous service to 350°C (662 °F). It conducts heat at 48 W/m·K (27.7 BTU/hr·ft·°F), better than 79% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
09CuPCrNi conducts electricity at 8.6 % IACS, better than 66% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (32/100), better than 96% of steel grades.
Sustainability4
Producing a kilogram of 09CuPCrNi takes about 25 MJ of energy and emits 2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 25%.
Manufacturability7
09CuPCrNi's machinability is good (62/100, better than 89% of steel grades); weldability very good (78/100); formability very good (75/100).
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. 09CuPCrNi is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 09CuPCrNi
Is 09CuPCrNi easy to machine?
Machines like a 250–300 MPa-yield HSLA steel: ~65 % of AISI 1212 speeds, sticky gummy chips in the as-rolled state, so use positive rake and sharp coated carbide.
Can 09CuPCrNi be welded?
Readily welded by SMAW/GMAW/SAW with weathering-matching consumables (e.g. E5015-G Cu-Cr-Ni type) so the weld patinas with the base metal; keep heat input moderate and preheat 50–100 °C on thicker plate because of the high phosphorus content.
Can 09CuPCrNi be formed, bent or molded?
Good cold bendability in hot-rolled or annealed sheet (bend radius ≈2t); phosphorus raises the risk of edge cracking, so deburr sheared edges before tight bends.
09CuPCrNi 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≤0.12 % per GB/T 4171 Q265GNH | ≤ 0.12 | 0.09 |
| Si | 0.2 – 0.75 | 0.35 |
| Mn | 0.2 – 0.5 | 0.35 |
| Pdeliberate addition for patina stability | 0.07 – 0.12 | 0.09 |
| S | ≤ 0.03 | 0.02 |
| Cu | 0.2 – 0.5 | 0.35 |
| Cr | 0.3 – 1.25 | 0.6 |
| Ni | 0.12 – 0.65 | 0.3 |
| Fe | balance |
What surface finishes work on 09CuPCrNi?
Normally left unpainted to develop its patina — surfaces must be free-draining and mill scale/grease removed for an even rust colour; if coating is wanted, blast to Sa 2.5 and use an epoxy primer, and expect rust run-off staining of adjacent concrete or aluminium.
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 09CuPCrNi in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- GB (China)
- Q265GNH
- Similar grades
- A242
How much does 09CuPCrNi cost?
09CuPCrNi is a budget-cost steel ($), cheaper than about 90% 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.
09CuPCrNi — frequently asked
What is 09CuPCrNi used for?
09CuPCrNi is typically used for railway hopper cars, outdoor sculptures and shipping equipment. In short: classic Corten-type weathering steel; most formable weathering grade; superseded by Q355NH.
What is the yield strength of 09CuPCrNi?
09CuPCrNi has a typical yield strength of 300 MPa (43.5 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 86% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is 09CuPCrNi easy to machine?
Reasonably — machinability is rated good (62/100, better than 89% of steel grades). Machines like a 250–300 MPa-yield HSLA steel: ~65 % of AISI 1212 speeds, sticky gummy chips in the as-rolled state, so use positive rake and sharp coated carbide.
Can 09CuPCrNi be welded?
Yes — weldability is rated very good (78/100). Readily welded by SMAW/GMAW/SAW with weathering-matching consumables (e.g. E5015-G Cu-Cr-Ni type) so the weld patinas with the base metal; keep heat input moderate and preheat 50–100 °C on thicker plate because of the high phosphorus content.
What surface finishes work on 09CuPCrNi?
Normally left unpainted to develop its patina — surfaces must be free-draining and mill scale/grease removed for an even rust colour; if coating is wanted, blast to Sa 2.5 and use an epoxy primer, and expect rust run-off staining of adjacent concrete or aluminium.
Can 09CuPCrNi be formed, bent or molded?
Good cold bendability in hot-rolled or annealed sheet (bend radius ≈2t); phosphorus raises the risk of edge cracking, so deburr sheared edges before tight bends.
What is the maximum service temperature of 09CuPCrNi?
09CuPCrNi is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 09CuPCrNi-HR and 09CuPCrNi-CR?
HR is the default condition — standard stocked condition for weathering plate, coil and railcar sheet; pick unless low-temperature toughness certification is required. CR: thin (0.5–3 mm) cold-rolled coil for container and railcar panels needing tight thickness tolerance and smooth surface. Yield strength is 300 MPa in HR versus 400 MPa in CR.
How much does 09CuPCrNi cost?
09CuPCrNi is a budget-cost steel ($), cheaper than about 90% 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
- GB/T 4171-2008 (Atmospheric corrosion resisting structural steel) (2008)
- ASTM A242/A242M Standard Specification for High-Strength Low-Alloy Structural Steel — ASTM International (2018)
- TB/T 1979 (railway vehicle weathering steel) (2013)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (HSLA & weathering steels) — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials (atmospheric corrosion of weathering steel) — ASM International (2005)
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.