Stainless Steel CB7Cu-2-H925
Precip hard
UNS J92110 · ASTM A747 Grade CB7Cu-2
H925 = aged 496 °C (925 °F) for 4 h
Slightly overaged from H900 for a small gain in toughness and SCC resistance at near-peak strength.
Values for the H925 condition
Other CB7Cu-2 tempers and conditions
CB7Cu-2 is listed in 8 conditions; see the grade overview at CB7Cu-2.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Double overaged 760 °C + 621 °C | Specify where maximum notch toughness and low hardness (e.g. sour-service or cryogenic-tolerant parts) outweigh strength. | 550 | 790 | 20 | 25 HRC | — |
Solution annealed | As-supplied condition from the foundry for machining and subsequent single-step aging; not normally used in service. | 725 | 930 | 12 | 32 HRC | — |
Overaged 621 °C (1150 °F) for 4 h, maximum toughness | Pick for maximum toughness, ductility and best SCC/H₂ embrittlement resistance at the lowest strength level. | 760 | 900 | 16 | 30 HRC | — |
H1100Default Aged 593 °C (1100 °F) for 4 h | Most commonly stocked casting condition — good compromise of strength, toughness and corrosion resistance. | 860 | 1,000 | 13 | 33 HRC | — |
Aged 579 °C (1075 °F) for 4 h | Use when moderate strength with good impact toughness and easier machining is wanted. | 930 | 1,035 | 12 | 35 HRC | — |
Aged 552 °C (1025 °F) for 4 h | Balanced condition: ~1070 MPa tensile with clearly improved ductility over H900. | 1,035 | 1,105 | 11 | 38 HRC | — |
H925This page Aged 496 °C (925 °F) for 4 h | Slightly overaged from H900 for a small gain in toughness and SCC resistance at near-peak strength. | 1,140 | 1,240 | 10 | 42 HRC | — |
Aged 482 °C (900 °F) for 1 h, peak hardness | Choose for maximum strength and hardness where toughness and SCC resistance are secondary. | 1,210 | 1,350 | 8 | 44 HRC | — |
What is CB7Cu-2-H925?
CB7Cu-2-H925 is CB7Cu-2 in the H925 condition — slightly overaged from H900 for a small gain in toughness and SCC resistance at near-peak strength. CB7Cu-2-H925 has a yield strength of 1,140 MPa (165 ksi) and a tensile strength of 1,240 MPa (180 ksi) — stronger than 98% of stainless steel grades. Elongation at break is 10% and the elastic modulus is 196 GPa (28.4 Msi). CB7Cu-2-H925 has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,400°C (2,552 °F). H1100 is the default condition FabDigit quotes; H925 is available on request or by drawing note.
Advantages
- High strength — 1,140 MPa (165 ksi), better than 98% of stainless steel grades
Limitations
- Limited ductility — 10%, worse than 98% of stainless steel grades
- Limited service temperature — 300°C (572 °F), worse than 90% of stainless steel grades
- Limited formability — 20/100, worse than 86% of stainless steel grades
- Low fracture toughness — 72 MPa·√m (65.5 ksi·√in), worse than 82% of stainless steel grades
- Needs corrosion protection — 52/100, worse than 76% of stainless steel grades
CB7Cu-2-H925 properties
Typical room-temperature values for CB7Cu-2-H925; 15 are specific to this condition. Other listed values are CB7Cu-2 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
CB7Cu-2-H925 has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical16
CB7Cu-2-H925 has a yield strength of 1,140 MPa (165 ksi) and a tensile strength of 1,240 MPa (180 ksi) — stronger than 98% of stainless steel grades. Elongation at break is 10% and the elastic modulus is 196 GPa (28.4 Msi).
Thermal6
CB7Cu-2-H925 is rated for continuous service to 300°C (572 °F). It conducts heat at 17.8 W/m·K (10.3 BTU/hr·ft·°F), better than 72% of stainless steel grades. Thermal expansion is 10.8 µm/m·K (6 µin/in·°F).
Electrical3
CB7Cu-2-H925 conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (52/100), worse than 76% of stainless steel grades.
Sustainability4
Producing a kilogram of CB7Cu-2-H925 takes about 55 MJ of energy and emits 4.2 kg of CO₂ — more than 50% of stainless steel grades. Typical recycled content is 70%.
Manufacturability8
CB7Cu-2-H925's machinability is poor (30/100, worse than 70% of stainless steel grades); weldability good (65/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CB7Cu-2-H925
Is CB7Cu-2 easy to machine?
Machine in Condition A or after H1075–H1150 aging; rigid setups, sharp carbide with positive rake, 30–60 m/min, heavy feed to cut under the work-hardened skin — H900 parts should only be finish-ground.
Can CB7Cu-2 be welded?
Readily GTAW/GMAW welded with matching 15-5PH or 17-4PH (AMS 5826) filler, low heat input, no preheat needed; re-solution-treat and re-age (or at minimum re-age) for full properties in the weld and HAZ.
Can CB7Cu-2 be formed, bent or molded?
Sand or investment cast with generous risering and chills to avoid shrinkage porosity; HIP is common for aerospace castings, then solution treat ~1040 °C, air/oil quench and single-step age.
What surface finishes work on CB7Cu-2?
Passivate per ASTM A967 (nitric or citric) after machining; electropolish or fine-polish for hygienic surfaces; can be chrome-plated or nitrided if baked below the aging temperature to avoid hydrogen embrittlement — anodizing is not applicable.
CB7Cu-2 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 | ≤ 0.07 | 0.05 |
| Mn | ≤ 0.7 | 0.5 |
| Si | ≤ 1 | 0.6 |
| P | ≤ 0.04 | 0.02 |
| S | ≤ 0.03 | 0.01 |
| Cr | 14 – 15.5 | 14.8 |
| Ni | 4.5 – 5.5 | 5 |
| Cuprecipitation hardener (ε-Cu) | 2.5 – 3.2 | 2.9 |
| NbCb (+Ta) stabilizer | 0.15 – 0.35 | 0.25 |
| Fe | balance | — |
CB7Cu-2-H925 — frequently asked
What is CB7Cu-2-H925 used for?
CB7Cu-2-H925 is typically used for aerospace structural castings, pump and valve components, high-strength fasteners, turbine parts and food and chemical processing equipment. In short: cast 15-5PH equivalent; strongest cast PH stainless; aerospace casting grade.
What is the yield strength of CB7Cu-2-H925?
CB7Cu-2-H925 has a typical yield strength of 1,140 MPa (165 ksi) and a tensile strength of 1,240 MPa (180 ksi) — stronger than 98% of stainless steel grades. Strength varies by condition: see the 8 listed tempers.
Is CB7Cu-2-H925 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 70% of stainless steel grades). Machine in Condition A or after H1075–H1150 aging; rigid setups, sharp carbide with positive rake, 30–60 m/min, heavy feed to cut under the work-hardened skin — H900 parts should only be finish-ground.
Can CB7Cu-2-H925 be welded?
Yes — weldability is rated good (65/100). Readily GTAW/GMAW welded with matching 15-5PH or 17-4PH (AMS 5826) filler, low heat input, no preheat needed; re-solution-treat and re-age (or at minimum re-age) for full properties in the weld and HAZ.
What surface finishes work on CB7Cu-2-H925?
Passivate per ASTM A967 (nitric or citric) after machining; electropolish or fine-polish for hygienic surfaces; can be chrome-plated or nitrided if baked below the aging temperature to avoid hydrogen embrittlement — anodizing is not applicable.
Can CB7Cu-2-H925 be formed, bent or molded?
Sand or investment cast with generous risering and chills to avoid shrinkage porosity; HIP is common for aerospace castings, then solution treat ~1040 °C, air/oil quench and single-step age.
What is the maximum service temperature of CB7Cu-2-H925?
CB7Cu-2-H925 is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between CB7Cu-2-H1100 and CB7Cu-2-H900?
H1100 is the default condition — most commonly stocked casting condition — good compromise of strength, toughness and corrosion resistance. H900: choose for maximum strength and hardness where toughness and SCC resistance are secondary. Yield strength is 860 MPa in H1100 versus 1,210 MPa in H900.
Sources
- ASTM A747/A747M — Steel Castings, Stainless, Precipitation Hardening — ASTM International (2019)
- ASTM A957 — Investment Castings, Steel and Alloy, Common Requirements — ASTM International (2019)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Steel Castings Handbook, 6th ed. — Steel Founders' Society of America / ASM (1995)
- ATI 15-5PH (S15500) Precipitation Hardening Stainless Steel Technical Data — ATI Specialty Materials (2020)
- MMPDS-17 — 15-5PH stainless steel design allowables — Battelle/FAA (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.