Inconel 625 (CW6MC) Valve Seat Ring
ASTM A494 CW6MC / UNS N26625 (cast Inconel 625). 0.01–0.85 kg across 7 catalogued sizes.
The Valve Seat Ring is supplied as an investment casting in Inconel 625 (CW6MC) (ASTM A494 CW6MC / UNS N26625 (cast Inconel 625)). In this grade the 7 catalogued sizes weigh 0.01 to 0.85 kg as cast, before machining allowance. Where duplex is not enough: severe seawater, acid and sour service valve trim.
- Specification
- ASTM A494 CW6MC / UNS N26625 (cast Inconel 625)
- Corrosion
- Outstanding — resists pitting, crevice attack and chloride stress-corrosion cracking.
- Temperature
- approx. -196 C to +650 C
- Density
- 8.44 g/cm³
- Also known as
- ASTM A494 CW6MC, UNS N26625, Inconel 625, Alloy 625
- Casting weight
- 0.01 – 0.85 kg
Why Inconel 625 (CW6MC) for a valve seat ring
- Pressure boundary
- This part retains pressure, so the grade has to hold its rating at temperature and pass a hydrostatic shell test at 1.5 times that rating. Approx. -196 C to +650 C.
- Rotating duty
- The part is balanced after the bore and hub face are machined, because those are the datums the balance is measured against. Grade choice affects this through density: a change of alloy changes the mass and therefore the residual unbalance for the same geometry.
- Wear
- Abrasion or erosion sets the service life here, and hardness after heat treatment matters more than tensile strength. Machinability is the trade: difficult — gummy, work-hardens severely.
- Fabrication
- Machinability: difficult — gummy, work-hardens severely. Weldability: excellent. Both change the finished cost as much as the metal price does, and neither shows up on a materials comparison table.
Casting Weight in Inconel 625 (CW6MC)
As-cast weight per size, before machining allowance, scaled from the alloy density. Gates and risers are additional and are not part of the finished-part weight.
| Size | Casting weight in Inconel 625 (CW6MC) (kg) |
|---|---|
| Ø30 | 0.01 |
| Ø40 | 0.03 |
| Ø50 | 0.05 |
| Ø65 | 0.12 |
| Ø80 | 0.22 |
| Ø100 | 0.44 |
| Ø125 | 0.85 |
Alternatives to Inconel 625 (CW6MC) for This Part
The question is rarely "tell me about this grade" — it is "this grade, or something else?". These are the other grades this part is legitimately cast in.
| Grade | Specification | Corrosion | Temperature |
|---|---|---|---|
| CF8M | ASTM A351 CF8M / UNS J92900 (cast 316) | Good pitting and crevice resistance in chlorides; standard choice for seawater-adjacent and chemical process duty. | approx. -196 C to +550 C, derated for pressure-retaining service above 425 C |
| CF3M | ASTM A351 CF3M / UNS J92800 (cast 316L) | As CF8M, with the low carbon that prevents sensitization at welds. | approx. -196 C to +425 C |
| CF8 | ASTM A351 CF8 / UNS J92600 (cast 304) | Good general corrosion resistance in fresh water, steam and mild chemicals; not for chlorides. | approx. -196 C to +550 C |
| CF3 | ASTM A351 CF3 / UNS J92500 (cast 304L) | As CF8 with low carbon for welded assemblies. | approx. -196 C to +425 C |
| CA6NM | ASTM A743 CA6NM / UNS J91540 | Moderate — better than carbon steel in water, well short of CF8M in chlorides. | approx. -73 C to +370 C |
Alloys & Grades
The Valve Seat Ring is cast in 13 of the 63 grades we work in. Those are listed first; the full reference tree is underneath, with each designation shown alongside its ASTM/UNS, EN and GB equivalents.
- CF8M catalog grade ASTM A351 CF8M / UNS J92900 (cast 316)
- CF3M ASTM A351 CF3M / UNS J92800 (cast 316L)
- CF8 ASTM A351 CF8 / UNS J92600 (cast 304)
- CF3 ASTM A351 CF3 / UNS J92500 (cast 304L)
- CA6NM ASTM A743 CA6NM / UNS J91540
- CA15 ASTM A743 CA15 / UNS J91150 (cast 410)
- CB7Cu-1 (17-4 PH) ASTM A747 CB7Cu-1 / UNS J92180 (17-4 PH)
- CD3MN (2205) ASTM A890 Gr 4A / UNS J92205 (cast 2205 duplex)
- CE3MN (2507) ASTM A890 Gr 5A / UNS J93404 (cast 2507 super duplex)
- WCB ASTM A216 WCB / UNS J03002
- WCC ASTM A216 WCC / UNS J02503
- Inconel 625 (CW6MC) ASTM A494 CW6MC / UNS N26625 (cast Inconel 625)
- C95800 Nickel Aluminum Bronze ASTM B148 C95800 (nickel aluminum bronze)
Browse all 63 cast grades we work instainless · carbon & low-alloy · nickel & cobalt · copper · aluminium · titanium
Austenitic Cast Stainless Steel
- CF8 ASTM A351 CF8 · UNS J92600 · AISI 304 cast · EN 1.4308
- CF3 ASTM A351 CF3 · UNS J92500 · AISI 304L cast · EN 1.4309
- CF8M ASTM A351 CF8M · UNS J92900 · AISI 316 cast · EN 1.4408
- CF3M ASTM A351 CF3M · UNS J92800 · AISI 316L cast · EN 1.4409
- CF8C ASTM A351 CF8C · UNS J92710 · AISI 347 cast · EN 1.4552
- CG8M ASTM A351 CG8M · UNS J93000 · AISI 317 cast
- CN7M ASTM A351 CN7M · UNS N08007 · Alloy 20 cast · Carpenter 20
- CK3MCuN ASTM A351 CK3MCuN · UNS J93254 · 254 SMO cast · EN 1.4547
- CN3MN ASTM A351 CN3MN · UNS J94651 · AL-6XN cast
Martensitic Cast Stainless Steel
- CA15 ASTM A743 CA15 · UNS J91150 · AISI 410 cast · EN 1.4008
- CA40 ASTM A743 CA40 · UNS J91153 · AISI 420 cast · EN 1.4034
- CA6NM ASTM A743 CA6NM · UNS J91540 · EN 1.4313 · GX4CrNi13-4
- CA15M ASTM A743 CA15M · UNS J91151
- CA6N ASTM A743 CA6N · UNS J91650
Precipitation-Hardening Cast Stainless Steel
- CB7Cu-1 (17-4 PH) ASTM A747 CB7Cu-1 · UNS J92180 · 17-4 PH cast · AISI 630
- CB7Cu-2 (15-5 PH) ASTM A747 CB7Cu-2 · UNS J92110 · 15-5 PH cast
Duplex & Super Duplex Cast Stainless Steel
- CD3MN (2205) ASTM A890 Gr 4A · UNS J92205 · Duplex 2205 cast · EN 1.4470
- CE3MN (2507) ASTM A890 Gr 5A · UNS J93404 · Super Duplex 2507 cast · EN 1.4469
- CD4MCu ASTM A890 Gr 1A · UNS J93370
- CD3MWCuN (Zeron 100) ASTM A890 Gr 6A · UNS J93380 · Zeron 100 cast
Heat-Resistant Cast Stainless Steel
- HK30 ASTM A297 HK30 · UNS J94203 · GX40CrNiSi25-12
- HK40 ASTM A297 HK40 · UNS J94204 · EN 1.4848
- HH ASTM A297 HH · UNS J93503 · EN 1.4837 cast
- HT ASTM A297 HT · UNS J94605
- HP ASTM A297 HP · UNS J95705 · GX40NiCrSi35-25
Carbon Steel Castings
- WCB ASTM A216 WCB · UNS J03002 · GP240GH · EN 1.0619
- WCC ASTM A216 WCC · UNS J02503
- WCA ASTM A216 WCA · UNS J02502
- LCB ASTM A352 LCB · UNS J03003
- LCC ASTM A352 LCC · UNS J02505
- AISI 1045 Cast ASTM A732 Gr 1045 · UNS G10450 · C45 · 45#
Low-Alloy Steel Castings
- AISI 4140 Cast ASTM A732 Gr 4140 · UNS G41400 · 42CrMo4 · EN 1.7225
- AISI 8620 Cast ASTM A732 Gr 8620 · UNS G86200 · 20CrNiMo
- WC6 ASTM A217 WC6 · UNS J12072 · 1.25Cr-0.5Mo · G17CrMo5-5
- WC9 ASTM A217 WC9 · UNS J21890 · 2.25Cr-1Mo · G17CrMo9-10
- C5 ASTM A217 C5 · UNS J42045 · 5Cr-0.5Mo
- C12A ASTM A217 C12A · UNS J84090 · Grade 91 · 9Cr-1Mo-V
- AISI 4340 Cast ASTM A732 Gr 4340 · UNS G43400 · 40CrNiMoA
Nickel-Base Alloy Castings
- Inconel 625 (CW6MC) ASTM A494 CW6MC · UNS N26625 · Inconel 625 · Alloy 625
- Inconel 718 AMS 5383 · UNS N07718 · Alloy 718 · GH4169
- Inconel 713C AMS 5391 · UNS N07713 · Alloy 713C
- Hastelloy C (CW6M) ASTM A494 CW6M · UNS N30107 · Hastelloy C cast
- Hastelloy C-276 (CW12MW) ASTM A494 CW12MW · UNS N30002 · Alloy C-276 cast
- Monel M-35-1 ASTM A494 M35-1 · UNS N24135 · Monel 400 cast
Cobalt-Base Alloy Castings
- CoCrMo (ASTM F75) ASTM F75 · UNS R30075 · CoCr28Mo6
- Stellite 6 UNS R30006 · CoCr-A · Alloy 6
- Stellite 12 UNS R30012 · Alloy 12
- X-40 (Co-Cr-W) AMS 5382 · UNS R30031 · Haynes 31
Bronze Castings
- C95800 Nickel Aluminum Bronze ASTM B148 C95800 · UNS C95800 · NAB · CuAl10Fe5Ni5
- C95500 Nickel Aluminum Bronze ASTM B148 C95500 · UNS C95500
- C90300 Tin Bronze ASTM B584 C90300 · UNS C90300 · 88-8-0-4
- C93200 Bearing Bronze ASTM B584 C93200 · UNS C93200 · SAE 660
Brass Castings
- C83600 Red Brass ASTM B584 C83600 · UNS C83600 · 85-5-5-5
- C87600 Silicon Brass ASTM B584 C87600 · UNS C87600
- C86300 Manganese Bronze ASTM B584 C86300 · UNS C86300
Aluminum Alloy Castings
- A356 / A356-T6 ASTM B26 A356 · UNS A13560 · AlSi7Mg0.3 · EN AC-42000
- A357 ASTM B26 A357 · UNS A13570 · AlSi7Mg0.6
- 355 / C355 ASTM B26 355 · UNS A03550 · AlSi5Cu1Mg
- A201-T7 ASTM B26 A201 · UNS A02010 · AlCu4MgTi
Titanium Castings
- Ti-6Al-4V (Grade 5) ASTM B367 Gr C-5 · UNS R56400 · TC4 · Ti-6-4
- CP Titanium Grade 2 ASTM B367 Gr C-2 · UNS R50400
Special & Wear Alloys
- Ni-Resist D-2 ASTM A439 D-2 · UNS F43000
- High-Chrome White Iron ASTM A532 Class III · 25Cr white iron
Technical Drawing
Every parameter below is editable, and the drawing redraws to match the values you choose. Picking a size snaps the other fields to that size's values; you can then override any one of them.
Request a Quotation
The form follows the drawing configuration above. Attaching a drawing or a STEP file is the fastest route to a firm price.
Dimensions & Parameters
Nominal casting dimensions before machining allowance. Every row is a starting point for the customizer above.
| Size | Outer Diameter ØD (mm) | Overall Width W (mm) | Bore Diameter Ød (mm) | Hub Diameter ØD1 (mm) | Blade Thickness T (mm) | Blade Count | Fillet Radius R (mm) | Casting Weight (kg) |
|---|---|---|---|---|---|---|---|---|
| Ø30 | 30 | 7.2 | 18 | 24 | 3 | 0 | 2.5 | 0.01 |
| Ø40 | 40 | 9.6 | 24 | 32 | 3 | 0 | 2.5 | 0.03 |
| Ø50 | 50 | 12 | 32 | 40 | 3.5 | 0 | 3 | 0.05 |
| Ø65 | 65 | 15.6 | 40 | 52 | 4.6 | 0 | 3.5 | 0.11 |
| Ø80 | 80 | 19.2 | 50 | 64 | 5.6 | 0 | 4.5 | 0.21 |
| Ø100 | 100 | 24 | 62 | 80 | 7 | 0 | 5.5 | 0.41 |
| Ø125 | 125 | 30 | 78 | 100 | 8.8 | 0 | 7 | 0.8 |
Frequently Asked Questions
Is Inconel 625 (CW6MC) the right grade for a valve seat ring?
Where duplex is not enough: severe seawater, acid and sour service valve trim. Outstanding — resists pitting, crevice attack and chloride stress-corrosion cracking. Approx. -196 C to +650 C.
What does a valve seat ring weigh in Inconel 625 (CW6MC)?
Between 0.01 kg and 0.85 kg as cast across the 7 catalogued sizes, before machining allowance. The figure scales with the alloy density, so the same geometry in a different grade weighs proportionally more or less — which is why the weight is stated per grade rather than once for the part.
Can a valve seat ring in Inconel 625 (CW6MC) be welded or machined?
Machinability: difficult — gummy, work-hardens severely. Weldability: excellent. Both affect the finished cost as much as the metal price does, so state the machining scope on the RFQ rather than leaving it to be discovered.
How do I request a quotation?
Configure the drawing on this page — size, alloy, finish — and submit the form. Attaching a drawing or a STEP file is the fastest route to a firm price, and it lets us flag a castability issue before you commit to tooling.
More on the Valve Seat Ring
The full record for the valve seat ring — every catalogued size, the parametric drawing and the quote form — is on the Valve Seat Ring product page.
Each grade changes the price, the weight and what the part survives, so there is a page per grade for this part: CF8M (the catalog grade), WCB (the carbon-steel cost baseline), CA6NM (tough and cavitation resistant), CF3M (low carbon, for welded assemblies), CF8 (cheaper, where chlorides are absent) and CA15 (hardenable, for wear-loaded duty).
How it is shelled decides the tolerance and the surface you get, and the tolerance band is worked out against this part's own dimensions on each: Silica Sol Casting (DCTG 5 – 7, Ra 3.2 – 6.3 µm), Water Glass Casting (DCTG 7 – 9, Ra 6.3 – 12.5 µm) and Composite Shell Casting (DCTG 6 – 8, Ra 6.3 – 12.5 µm).
The specification and the testing change by sector more than the geometry does, so the valve seat ring is written up separately for Valve Manufacturing, Oil & Gas, Chemical Processing, Power Generation, Water & Wastewater and Marine & Offshore.
If the question is still whether a casting is the right way to make this part at all, the Valve Seat Ring application guide covers where it is used, what has to be decided before a price exists, and where investment casting is the wrong answer.