Stainless Steel CB7Cu-1-H1075
Precip hard
UNS J92180 · ASTM A747 Grade CB7Cu-1
H1075 = aged 579 °C (1075 °F) for 4 h
Mid-range temper giving ~965 MPa tensile with good toughness and improved chloride SCC resistance.
Values for the H1075 condition
Other CB7Cu-1 tempers and conditions
CB7Cu-1 is listed in 9 conditions; see the grade overview at CB7Cu-1.
Compare all 9 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Double overaged 760 °C + 621 °C | Double-overaged condition ordered for sour (H2S) or low-temperature service where maximum toughness and hardness ≤ 22 HRC are required. | 590 | 790 | 18 | 20 HRC | — |
Solution annealed | Supply/intermediate condition for machining or further fabrication before the customer's own aging cycle; not a final service condition per A747. | 760 | 1,030 | 12 | 33 HRC | — |
H1150Default Overaged 621 °C (1150 °F) for 4 h, maximum toughness | Most widely ordered condition: best toughness, ductility and SCC/sour-service behaviour with still-high 790 MPa class yield — default for pump and valve castings. | 790 | 895 | 14 | 28 HRC | 18 W/m·K |
Aged 593 °C (1100 °F) for 4 h | Tougher, lower-hardness temper for parts needing impact resistance and better resistance to stress-corrosion cracking. | 860 | 950 | 13 | 30 HRC | — |
H1075This page Aged 579 °C (1075 °F) for 4 h | Mid-range temper giving ~965 MPa tensile with good toughness and improved chloride SCC resistance. | 930 | 1,000 | 12 | 32 HRC | — |
Aged 552 °C (1025 °F) for 4 h | High strength with usable impact toughness; a frequent choice for pump shafts, impellers and valve bodies. | 1,000 | 1,070 | 11 | 34 HRC | — |
Solution treated + aged 538 °C / 4 h | Balanced strength/toughness step between H925 and H1025; used when a specific 1000 MPa-class yield is required. | 1,070 | 1,140 | 10 | 36 HRC | — |
Aged 496 °C (925 °F) for 4 h | Near-peak strength with slightly better ductility and SCC behaviour than H900; common for high-pressure pump internals. | 1,170 | 1,260 | 9 | 40 HRC | — |
Aged 482 °C (900 °F) for 1 h, peak hardness | Maximum strength and hardness; choose for wear-prone valve trim and high-load parts where toughness and SCC resistance are secondary. | 1,240 | 1,350 | 8 | 42 HRC | 18 W/m·K |
What is CB7Cu-1-H1075?
CB7Cu-1-H1075 is CB7Cu-1 in the H1075 condition — mid-range temper giving ~965 MPa tensile with good toughness and improved chloride SCC resistance. CB7Cu-1-H1075 has a yield strength of 930 MPa (135 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 98% of stainless steel grades. Elongation at break is 12% and the elastic modulus is 196 GPa (28.4 Msi). CB7Cu-1-H1075 has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,404°C (2,559 °F). H1150 is the default condition FabDigit quotes; H1075 is available on request or by drawing note.
Advantages
- High strength — 930 MPa (135 ksi), better than 98% of stainless steel grades
Limitations
- Limited formability — 8/100, worse than 97% of stainless steel grades
- Limited ductility — 12%, worse than 95% of stainless steel grades
- Limited service temperature — 315°C (599 °F), worse than 85% of stainless steel grades
CB7Cu-1-H1075 properties
Typical room-temperature values for CB7Cu-1-H1075; 16 are specific to this condition. Other listed values are CB7Cu-1 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
CB7Cu-1-H1075 has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,404°C (2,559 °F).
Mechanical16
CB7Cu-1-H1075 has a yield strength of 930 MPa (135 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 98% of stainless steel grades. Elongation at break is 12% and the elastic modulus is 196 GPa (28.4 Msi).
Thermal6
CB7Cu-1-H1075 is rated for continuous service to 315°C (599 °F). It conducts heat at 18.3 W/m·K (10.6 BTU/hr·ft·°F), better than 73% of stainless steel grades. Thermal expansion is 10.9 µm/m·K (6.06 µin/in·°F).
Electrical3
CB7Cu-1-H1075 conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (57/100), worse than 66% of stainless steel grades.
Sustainability4
Producing a kilogram of CB7Cu-1-H1075 takes about 58 MJ of energy and emits 5 kg of CO₂ — more than 66% of stainless steel grades. Typical recycled content is 60%.
Manufacturability8
CB7Cu-1-H1075's machinability is fair (41/100, better than 77% of stainless steel grades); weldability good (60/100); formability not recommended (8/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CB7Cu-1-H1075
Is CB7Cu-1 easy to machine?
Machine in Condition A or H1150 with rigid setups, sharp positive-rake carbide, 60–110 m/min and heavy feeds to break the work-hardening skin; H900 parts should be finish-ground rather than turned.
Can CB7Cu-1 be welded?
Weldable by GTAW/GMAW with matching 17-4PH (AWS A5.9 ER630) filler, low heat input and no preheat needed on thin sections; re-solution treat and re-age after welding for full properties, or at minimum re-age at the specified H-temperature.
Can CB7Cu-1 be formed, bent or molded?
Cast only — good fluidity in sand and investment moulds, but design generous risers and 3–5 % solidification feed since the alloy is prone to shrinkage porosity in heavy sections; HIP is common for critical parts.
What surface finishes work on CB7Cu-1?
Passivate per ASTM A967 (nitric or citric) after machining; takes a good mechanical or electropolish; hard chrome, nitriding or PVD can be applied below the aging temperature to avoid over-tempering.
CB7Cu-1 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 | 0.8 |
| P | ≤ 0.04 | 0.02 |
| S | ≤ 0.03 | 0.02 |
| Cr | 15.5 – 17.7 | 16.5 |
| Ni | 3.6 – 4.6 | 4.1 |
| Cuprecipitation-hardening element | 2.5 – 3.2 | 2.9 |
| NbCb; stabilizer | 0.15 – 0.35 | 0.25 |
| Moresidual | ≤ 0.5 | 0.2 |
| Fe | balance | — |
CB7Cu-1-H1075 — frequently asked
What is CB7Cu-1-H1075 used for?
CB7Cu-1-H1075 is typically used for pump casings and impellers, valve bodies, marine hardware, aerospace structural castings and chemical processing equipment. In short: cast 17-4PH equivalent; high-strength PH casting; nine aging conditions.
What is the yield strength of CB7Cu-1-H1075?
CB7Cu-1-H1075 has a typical yield strength of 930 MPa (135 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 98% of stainless steel grades. Strength varies by condition: see the 9 listed tempers.
Is CB7Cu-1-H1075 easy to machine?
Not especially — machinability is rated fair (41/100, better than 77% of stainless steel grades). Machine in Condition A or H1150 with rigid setups, sharp positive-rake carbide, 60–110 m/min and heavy feeds to break the work-hardening skin; H900 parts should be finish-ground rather than turned.
Can CB7Cu-1-H1075 be welded?
Yes — weldability is rated good (60/100). Weldable by GTAW/GMAW with matching 17-4PH (AWS A5.9 ER630) filler, low heat input and no preheat needed on thin sections; re-solution treat and re-age after welding for full properties, or at minimum re-age at the specified H-temperature.
What surface finishes work on CB7Cu-1-H1075?
Passivate per ASTM A967 (nitric or citric) after machining; takes a good mechanical or electropolish; hard chrome, nitriding or PVD can be applied below the aging temperature to avoid over-tempering.
Can CB7Cu-1-H1075 be formed, bent or molded?
Cast only — good fluidity in sand and investment moulds, but design generous risers and 3–5 % solidification feed since the alloy is prone to shrinkage porosity in heavy sections; HIP is common for critical parts.
What is the maximum service temperature of CB7Cu-1-H1075?
CB7Cu-1-H1075 is rated for continuous use to about 315°C (599 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between CB7Cu-1-H1150 and CB7Cu-1-H900?
H1150 is the default condition — most widely ordered condition: best toughness, ductility and SCC/sour-service behaviour with still-high 790 MPa class yield — default for pump and valve castings. H900: maximum strength and hardness; choose for wear-prone valve trim and high-load parts where toughness and SCC resistance are secondary. Yield strength is 790 MPa in H1150 versus 1,240 MPa in H900.
Sources
- ASTM A747/A747M — Steel Castings, Stainless, Precipitation Hardening — ASTM International (2019)
- ASTM A564/A564M — Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars (17-4PH reference) — 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)
- 17-4 PH Stainless Steel Product Data Bulletin — AK Steel / Cleveland-Cliffs (2016)
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.