Stainless Steel CC50 Annealed
Temper · default condition
UNS J92615 · ASTM A743 Grade CC50
Standard supply condition for corrosion service: homogenizes chromium, restores passivity and gives the best available ductility.
Values for the Annealed condition
Other CC50 tempers and conditions
CC50 is listed in 3 conditions; see the grade overview at CC50.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefaultThis page 1040–1095 °C, air or furnace cool per ASTM A743 | Standard supply condition for corrosion service: homogenizes chromium, restores passivity and gives the best available ductility. | 275 | 480 | 10 | 210 HB | — |
CC50 with 2.0–4.0 % Ni and ≤0.15 % N | Choose when the specification calls for the 450 MPa / 205 MPa mechanical class and somewhat better ductility than the low-nickel chemistry. | 290 | 510 | 14 | 215 HB | 2.2 % IACS |
no post-solidification heat treatment | Lowest-cost condition for non-critical corrosion or abrasion parts where maximum hardness matters more than toughness. | 310 | 500 | 5 | 19 HRC | 2.3 % IACS |
What is CC50 Annealed?
CC50 Annealed is CC50 in the Annealed temper — standard supply condition for corrosion service: homogenizes chromium, restores passivity and gives the best available ductility. CC50 Annealed has a yield strength of 275 MPa (39.9 ksi) and a tensile strength of 480 MPa (69.6 ksi) — weaker than 77% of stainless steel grades. Elongation at break is 10% and the elastic modulus is 200 GPa (29 Msi). CC50 Annealed has a density of 7.6 g/cm³ (0.275 lb/in³), lighter than 98% of stainless steel grades. It melts at 1,370°C (2,498 °F).
Advantages
- High service temperature — 1,090°C (1,994 °F), better than 93% of stainless steel grades
- Conducts heat well — 20.5 W/m·K (11.8 BTU/hr·ft·°F), better than 75% of stainless steel grades
Limitations
- Limited ductility — 10%, worse than 98% of stainless steel grades
- Low fracture toughness — 40 MPa·√m (36.4 ksi·√in), worse than 97% of stainless steel grades
- Limited formability — 10/100, worse than 95% of stainless steel grades
- Hard to polish — 55/100, worse than 89% of stainless steel grades
- Difficult to weld — 30/100, worse than 88% of stainless steel grades
CC50 Annealed properties
Typical room-temperature values for CC50 Annealed; 10 are specific to this condition. Other listed values are CC50 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
CC50 Annealed has a density of 7.6 g/cm³ (0.275 lb/in³), lighter than 98% of stainless steel grades. It melts at 1,370°C (2,498 °F).
Mechanical16
CC50 Annealed has a yield strength of 275 MPa (39.9 ksi) and a tensile strength of 480 MPa (69.6 ksi) — weaker than 77% of stainless steel grades. Elongation at break is 10% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
CC50 Annealed is rated for continuous service to 1,090°C (1,994 °F). It conducts heat at 20.5 W/m·K (11.8 BTU/hr·ft·°F), better than 75% of stainless steel grades. Thermal expansion is 10.5 µm/m·K (5.83 µin/in·°F).
Electrical3
CC50 Annealed conducts electricity at 2.3 % IACS, better than 55% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (72/100), better than 73% of stainless steel grades.
Sustainability4
Producing a kilogram of CC50 Annealed takes about 55 MJ of energy and emits 4.2 kg of CO₂ — more than 50% of stainless steel grades. Typical recycled content is 65%.
Manufacturability7
CC50 Annealed's machinability is fair (35/100, better than 51% of stainless steel grades); weldability poor (30/100); formability not recommended (10/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CC50 Annealed
Is CC50 easy to machine?
Machine with rigid setups, sharp carbide or ceramic tooling, low speed and heavy positive feed; the chromium carbides are abrasive and the alloy work-hardens quickly.
Can CC50 be welded?
Weldable with matching high-Cr or austenitic (E309/E312) filler using 200–260 °C preheat and low heat input, followed by a 1040–1095 °C anneal to restore HAZ ductility.
Can CC50 be formed, bent or molded?
A casting-only grade with good fluidity but high shrinkage — use generous risering and avoid sharp section changes; no cold forming.
What surface finishes work on CC50?
Passivate in nitric acid after machining; can be shot-blasted, ground and polished, though carbide phases limit true mirror finishes; no anodizing.
CC50 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 |
|---|---|---|
| C0.50 % max | ≤ 0.5 | 0.35 |
| Mn | ≤ 1 | 0.7 |
| Si | ≤ 1.5 | 1 |
| P | ≤ 0.04 | — |
| S | ≤ 0.04 | — |
| Cr | 26 – 30 | 28 |
| Ni4.0 % max; optional 2.0–4.0 % with N ≤0.15 % for the higher-strength class | ≤ 4 | 1.5 |
| Nonly specified for the 2.0–4.0 % Ni chemistry | ≤ 0.15 | — |
| Fe | balance | — |
CC50 Annealed — frequently asked
What is CC50 Annealed used for?
CC50 Annealed is typically used for valve and pump bodies, oxidizing acid service, corrosion-resistant castings and chemical processing hardware. In short: high-Cr ferritic casting alloy; oxidizing acid resistance; low ductility, hard to machine.
What is the yield strength of CC50 Annealed?
CC50 Annealed has a typical yield strength of 275 MPa (39.9 ksi) and a tensile strength of 480 MPa (69.6 ksi) — weaker than 77% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is CC50 Annealed easy to machine?
Not especially — machinability is rated fair (35/100, better than 51% of stainless steel grades). Machine with rigid setups, sharp carbide or ceramic tooling, low speed and heavy positive feed; the chromium carbides are abrasive and the alloy work-hardens quickly.
Can CC50 Annealed be welded?
Not readily — weldability is rated poor (30/100). Weldable with matching high-Cr or austenitic (E309/E312) filler using 200–260 °C preheat and low heat input, followed by a 1040–1095 °C anneal to restore HAZ ductility.
What surface finishes work on CC50 Annealed?
Passivate in nitric acid after machining; can be shot-blasted, ground and polished, though carbide phases limit true mirror finishes; no anodizing.
Can CC50 Annealed be formed, bent or molded?
A casting-only grade with good fluidity but high shrinkage — use generous risering and avoid sharp section changes; no cold forming.
What is the maximum service temperature of CC50 Annealed?
CC50 Annealed is rated for continuous use to about 1,090°C (1,994 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between CC50 Annealed and CC50 AS-CAST?
Annealed is the default condition — standard supply condition for corrosion service: homogenizes chromium, restores passivity and gives the best available ductility. AS-CAST: lowest-cost condition for non-critical corrosion or abrasion parts where maximum hardness matters more than toughness. Yield strength is 275 MPa in Annealed versus 310 MPa in AS-CAST.
Sources
- ASTM A743/A743M — Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application — ASTM International (2019)
- ASTM A800/A800M — Steel Castings, Austenitic Alloy, Estimating Ferrite Content — ASTM International (2020)
- Steel Castings Handbook, 6th ed. — Steel Founders' Society of America / ASM International (1995)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials — ASM International (2005)
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.