Stainless Steel CA28MWV
ASTM CA28MWV · UNS J91422
CA28MWV is a high-strength Cr-Mo-W-V cast martensitic steel (UNS J91422, ASTM A217 Gr.
Reference datasheet — CA28MWV 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 N+T condition
CA28MWV tempers and conditions
CA28MWV is supplied in 5 conditions, soft to hard. N+T 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 |
|---|---|---|---|---|---|---|
Annealed | Foundry soft-anneal (~845–900 °C, slow cool) used only to rough-machine heavy castings before final normalize-and-temper. | 500 | 760 | 18 | 21 HRC | — |
N+T plus post-weld stress relief | Condition of finished weld-repaired or fabricated castings; slight strength drop but restored HAZ toughness and low residual stress. | 730 | 1,000 | 14 | 31 HRC | 2.9 % IACS |
Double tempered (two tempers ≥ 690 °C) for long-term high-temperature… | Specified for turbine casings held near 550–600 °C for tens of thousands of hours; second temper decomposes retained austenite and stabilises toughness. | 740 | 1,010 | 15 | 31 HRC | 2.9 % IACS |
N+TDefault Normalized and tempered | Standard ASTM A217 delivery condition for steam-turbine casings and valve bodies; meets 1000 MPa UTS / 690 MPa YS with tempered-martensite creep stability. | 760 | 1,035 | 13 | 32 HRC | — |
Quenched and tempered | Quenched version for heavy sections where air cooling is too slow to fully harden the core; slightly higher strength than N+T. | 800 | 1,080 | 12 | 34 HRC | — |
What is CA28MWV?
CA28MWV is a high-strength Cr-Mo-W-V cast martensitic steel (UNS J91422, ASTM A217 Gr. CA28MWV) developed for high-temperature, high-pressure steam service where standard CA grades lack creep strength. In the normalized-and-tempered condition it gives about 760 MPa yield, 1035 MPa tensile, 13% elongation and 302 HB (32 HRC), with service to 593 °C. Ductility is lower than CA15/CA15M and welding demands strict preheat, hydrogen control and a high-temperature PWHT; availability is limited to power-plant casting foundries. CA28MWV has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,420°C (2,588 °F). CA28MWV has a yield strength of 760 MPa (110 ksi) and a tensile strength of 1,035 MPa (150 ksi) — stronger than 94% of stainless steel grades. Elongation at break is 13% and the elastic modulus is 205 GPa (29.7 Msi).
What is CA28MWV used for?
- Steam turbine casings
- High-pressure steam valves
- Power generation components
Advantages
- Low embodied carbon — 3 kg CO₂/kg, better than 97% of stainless steel grades
- High strength — 760 MPa (110 ksi), better than 94% of stainless steel grades
- High electrical conductivity — 2.9 % IACS, better than 87% of stainless steel grades
- Conducts heat well — 24 W/m·K (13.9 BTU/hr·ft·°F), better than 81% of stainless steel grades
Limitations
- Limited formability — 10/100, worse than 95% of stainless steel grades
- Limited ductility — 13%, worse than 93% of stainless steel grades
- Needs corrosion protection — 42/100, worse than 90% of stainless steel grades
- Low fracture toughness — 60 MPa·√m (54.6 ksi·√in), worse than 88% of stainless steel grades
- Difficult to weld — 30/100, worse than 88% of stainless steel grades
CA28MWV properties
Typical room-temperature values for CA28MWV-N+T; bars are the position among stainless steel grades.
Physical3
CA28MWV has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,420°C (2,588 °F).
Mechanical16
CA28MWV has a yield strength of 760 MPa (110 ksi) and a tensile strength of 1,035 MPa (150 ksi) — stronger than 94% of stainless steel grades. Elongation at break is 13% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
CA28MWV is rated for continuous service to 593°C (1,099 °F). It conducts heat at 24 W/m·K (13.9 BTU/hr·ft·°F), better than 81% of stainless steel grades. Thermal expansion is 10.8 µm/m·K (6 µin/in·°F).
Electrical3
CA28MWV conducts electricity at 2.9 % IACS, better than 87% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (42/100), worse than 90% of stainless steel grades.
Sustainability4
Producing a kilogram of CA28MWV takes about 39 MJ of energy and emits 3 kg of CO₂ — less than 98% of stainless steel grades. Typical recycled content is 60%.
Manufacturability8
CA28MWV's machinability is poor (30/100, worse than 70% of stainless steel grades); weldability poor (30/100); formability not recommended (10/100).
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 stainless steel family
Yield strength against density for every stainless steel grade FabDigit runs. CA28MWV is highlighted; hover a dot for its name, or open the interactive family chart.
Working with CA28MWV
Is CA28MWV easy to machine?
Machine in the soft-annealed condition where possible; in N+T at ~300 HB use rigid setups, coated carbide, low speed (60–90 m/min) and heavy positive feeds to cut under the work-hardened skin.
Can CA28MWV be welded?
Weldable with matching 12Cr-Mo-W-V or E410NiMo consumables only with 250–300 °C preheat/interpass, no cooling below ~120 °C before PWHT, and a 690–730 °C temper; hydrogen control is critical.
Can CA28MWV be formed, bent or molded?
Casting alloy — no cold forming; feed heavy sections generously, avoid abrupt section changes and normalize-and-temper the whole casting to homogenize the as-cast dendritic structure.
CA28MWV 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 | 0.2 – 0.28 | 0.24 |
| Mn | 0.5 – 1 | 0.75 |
| Si | ≤ 1 | 0.6 |
| Pimpurity | ≤ 0.03 | |
| Simpurity | ≤ 0.03 | |
| Cr | 11 – 12.5 | 11.8 |
| Ni | 0.5 – 1 | 0.75 |
| Mo | 0.9 – 1.25 | 1.05 |
| W | 0.9 – 1.25 | 1.05 |
| Vforms fine VC/VN for creep strength | 0.2 – 0.3 | 0.25 |
| Fe | balance |
What surface finishes work on CA28MWV?
Shot blast and pickle/passivate for a stable Cr-oxide film; can be hard-chrome plated or nitrided on seating faces, and takes a good mechanical polish but is not anodizable.
Surface treatments FabDigit runs on stainless 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).
Passivation
Organic Coating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Stainless Steel CA28MWV in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- J91422
- ASTM
- A217 Gr. CA28MWV
How much does CA28MWV cost?
CA28MWV is a premium-cost stainless steel ($$$), cheaper than about 51% 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.
CA28MWV — frequently asked
What is CA28MWV used for?
CA28MWV is typically used for steam turbine casings, high-pressure steam valves and power generation components. In short: highest-strength CA casting; creep-resistant steam grade; lower ductility than CA15.
What is the yield strength of CA28MWV?
CA28MWV has a typical yield strength of 760 MPa (110 ksi) and a tensile strength of 1,035 MPa (150 ksi) — stronger than 94% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is CA28MWV easy to machine?
Not especially — machinability is rated poor (30/100, worse than 70% of stainless steel grades). Machine in the soft-annealed condition where possible; in N+T at ~300 HB use rigid setups, coated carbide, low speed (60–90 m/min) and heavy positive feeds to cut under the work-hardened skin.
Can CA28MWV be welded?
Not readily — weldability is rated poor (30/100). Weldable with matching 12Cr-Mo-W-V or E410NiMo consumables only with 250–300 °C preheat/interpass, no cooling below ~120 °C before PWHT, and a 690–730 °C temper; hydrogen control is critical.
What surface finishes work on CA28MWV?
Shot blast and pickle/passivate for a stable Cr-oxide film; can be hard-chrome plated or nitrided on seating faces, and takes a good mechanical polish but is not anodizable.
Can CA28MWV be formed, bent or molded?
Casting alloy — no cold forming; feed heavy sections generously, avoid abrupt section changes and normalize-and-temper the whole casting to homogenize the as-cast dendritic structure.
What is the maximum service temperature of CA28MWV?
CA28MWV is rated for continuous use to about 593°C (1,099 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between CA28MWV N+T and CA28MWV-ANN?
N+T is the default condition — standard ASTM A217 delivery condition for steam-turbine casings and valve bodies; meets 1000 MPa UTS / 690 MPa YS with tempered-martensite creep stability. ANN: foundry soft-anneal (~845–900 °C, slow cool) used only to rough-machine heavy castings before final normalize-and-temper. Yield strength is 760 MPa in N+T versus 500 MPa in ANN.
How much does CA28MWV cost?
CA28MWV is a premium-cost stainless steel ($$$), cheaper than about 51% 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
- ASTM A217/A217M — Steel Castings, Martensitic Stainless and Alloy, for Pressure-Containing Parts, Suitable for High-Temperature Service — ASTM International (2021)
- ASME B16.34 — Valves: Flanged, Threaded, and Welding End (material rating tables) — ASME (2020)
- ASM Specialty Handbook: Heat-Resistant Materials / Cast Stainless Steels — ASM International (1997)
- Steel Castings Handbook, 6th ed. — Steel Founders' Society of America / ASM International (1995)
- UNS J91422 alloy record (Metals & Alloys in the Unified Numbering System) — SAE/ASTM (2017)
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.