Grade reference
The alloy grades we cast, in one reference
Ni-Chrome casts everything from carbon and alloy steels to cobalt and nickel-based superalloys, with the stainless, heat-resistant, corrosion-resistant and wear-resistant families in between, to ASTM, ASME, BS and IS standards at our Visakhapatnam foundry. HK40, HP-Nb, CT-15C, 50Cr-50Ni-Nb, HH, HF, HN, WCB, WC9 and cast SS316 are in regular production; the rest are families our melt shop pours to standard or agreed chemistry on order. Figures are nominal and indicative. The standard edition on your purchase order governs. Full datasheets and test certificates are sent by email on request.
- Heat-resistant · A297 H-series
- Corrosion-resistant · A351 / A743
- Cobalt & nickel superalloys
- Carbon & low-alloy · A216 / A217
- Wear-resistant irons & steels
- Which grade for which job
- Datasheets & certificates
- Buyer questions
Marked grades are in regular production. Every other grade is a family we cast to standard on order.
ASTM A297 · A351 · A560 · A608
Which heat-resistant grades can Ni-Chrome cast?
The full iron-chromium-nickel H-series, from HD at 28Cr-5Ni up to HX at 66Ni-17Cr, plus the petrochemical specialty grades: 50Cr-50Ni-Nb for fuel-ash service and CT-15C for reformer outlets, both in regular production and in the class of critical alloys Ni-Chrome is EIL-approved for, and the proprietary Super 22H type at the top of the creep range. Statically cast to ASTM A297, A351 or A560; centrifugally cast versions to ASTM A608. Service temperatures are indicative figures for clean oxidising atmospheres.
| Grade | ASTM | UNS / EN | Nominal type | Max service temp | Typical use | Enquire |
|---|---|---|---|---|---|---|
| HD | A297 | J93005 | 28Cr-5Ni | ~1,090 °C | Grate bars and furnace parts in high-sulphur atmospheres | Enquire → |
| HE | A297 | J93403 | 28Cr-9Ni | ~1,090 °C | Kiln and furnace parts where hot-gas corrosion is severe | Enquire → |
| HF | A297 | J92603 · 1.4825 | 20Cr-10Ni | ~870 °C | Tube supports and boiler parts at moderate temperature | Enquire → |
| HH | A297 | J93503 · 1.4837 | 25Cr-12Ni | ~1,090 °C | Hangers, supports and radiant parts; the most widely used H-grade | Enquire → |
| HI | A297 | J94003 | 28Cr-15Ni | ~1,120 °C | Retorts and salt pots | Enquire → |
| HK | A297 | J94224 | 25Cr-20Ni | ~1,150 °C | High-creep furnace structural parts | Enquire → |
| HK40 | A351 | J94204 · 1.4848 | 25Cr-20Ni · 0.4C | ~1,100 °C | Reformer and heater tube sheets, tube supports and hangers | Enquire → |
| HL | A297 | N08604 · J94604 | 29Cr-20Ni | ~1,150 °C | Highest sulphur resistance of the H-series | Enquire → |
| HN | A297 | J94213 | 20Cr-25Ni | ~1,100 °C | Highly stressed furnace parts | Enquire → |
| HP | A297 | N08705 · J95705 · 1.4857 | 26Cr-35Ni | ~1,150 °C | Severe reformer and cracking-furnace service | Enquire → |
| HP-Nb | A297 mod. | 1.4852 | 25Cr-35Ni-Nb | ~1,120 °C | Reformer outlets and manifolds; higher creep-rupture strength | Enquire → |
| HT | A297 | N08605 · J94605 | 17Cr-35Ni | ~1,150 °C | Carburising furnace fixtures, trays and rolls | Enquire → |
| HU | A297 | J95405 · N08004 | 19Cr-39Ni | ~1,150 °C | Severe thermal cycling, carburising and nitriding service | Enquire → |
| HW | A297 | N08001 | 12Cr-60Ni | ~1,120 °C | Enamelling and hardening fixtures, retorts, muffles | Enquire → |
| HX | A297 | N06006 · J94805 | 17Cr-66Ni | ~1,150 °C | Severest carburising and cyanide-hardening service | Enquire → |
| 50Cr-50Ni-Nb | A560 | R20501 | 48-52Cr · bal Ni · 1.4-1.7Nb (IN657 type) | ~1,050 °C | Tube supports and hangers in oil-fired heaters; fuel-ash corrosion | Enquire → |
| CT-15C | A351 | N08151 | 20Cr-32Ni-Nb | ~1,100 °C | Reformer outlet manifolds, x-mas trees, furnace parts | Enquire → |
| Super 22H type | Proprietary | 2.4879 (22H) | 28Cr-48Ni-5W | ~1,150 °C | Top-end reformer and pyrolysis duty; higher creep-rupture strength than HP-Nb | Enquire → |
ASTM A351 · A743 · A744
Which corrosion-resistant stainless grades are available?
The cast C-series equivalents of the wrought 300-series: CF8 for 304, CF8M for 316, the low-carbon CF3 and CF3M for as-welded service, the niobium-stabilised CF8C, and CN7M (Alloy 20) for hot sulphuric acid. Pump, valve and process castings for fertilizer and chemical plants.
| Grade | ASTM | UNS / EN | Nominal type | Wrought equivalent | Typical use | Enquire |
|---|---|---|---|---|---|---|
| CF3 | A351 / A743 | J92500 · 1.4309 | 19Cr-10Ni · low C | 304L | Valve and pump bodies used as-welded | Enquire → |
| CF3M | A351 / A743 | J92800 · 1.4409 | 19Cr-10Ni-2.5Mo · low C | 316L | Chloride-bearing process duty, as-welded | Enquire → |
| CF8 | A351 / A743 | J92600 · 1.4308 | 19Cr-9Ni | 304 | General pump, valve and fitting castings | Enquire → |
| CF8M | A351 / A743 | J92900 · 1.4408 | 19Cr-10Ni-2.5Mo | 316 | Process castings and impellers; the cast form of SS316 | Enquire → |
| CF8C | A351 / A744 | J92710 · 1.4552 | 19Cr-10Ni-Nb | 347 | Stabilised grade for elevated-temperature process duty | Enquire → |
| CN7M | A351 / A743 / A744 | N08007 | 20Cr-29Ni-2.5Mo-3.5Cu | Alloy 20 | Hot sulphuric acid service | Enquire → |
Cobalt & nickel bases
Which cobalt and nickel-based superalloys are available?
Three families past the iron-based grades: Stellite-type cobalt-chromium alloys for wear faces that must stay hard at red heat, UMCo-50 for furnace parts hit by thermal shock and hot slag, and the ASTM A494 nickel grades that are the cast forms of Alloy 600, Alloy 625 and Monel 400. Nimonic-type and other proprietary nickel-chromium compositions are cast to agreed chemistry; for Alloy 800 service, CT-15C above is the usual cast answer. Trademarked names belong to their owners; we cast to the published or specified chemistry.
| Grade | Standard | UNS | Nominal type | Typical use | Enquire |
|---|---|---|---|---|---|
| Stellite-type 6 | Proprietary | R30006 | Co-28Cr-4.5W-1.1C | Valve seats and trim, wear pads; the general-purpose hot-hardness grade | Enquire → |
| Stellite-type 12 | Proprietary | R30012 | Co-30Cr-8.5W-1.5C | Higher-carbide wear parts: saw tips, bearing sleeves, cutting edges | Enquire → |
| Stellite-type 21 | Proprietary | R30021 | Co-27Cr-5.5Mo-0.25C | Tougher, low-carbon grade for impact, thermal shock and hot-forging dies | Enquire → |
| UMCo-50 | Proprietary | Co-28Cr-21Fe | Furnace and sinter-plant fixtures, burner parts; resists thermal shock, hot gases and slag | Enquire → | |
| CY40 | A494 | N06040 | Ni-16Cr-8Fe (cast Alloy 600) | Caustic and high-purity-water service; chloride stress-corrosion immunity | Enquire → |
| CW-6MC | A494 | N26625 | Ni-21Cr-9Mo-3.5Nb (cast Alloy 625) | Severe combined corrosion and temperature; seawater and sour service | Enquire → |
| M35-1 | A494 | N24135 | Ni-30Cu (cast Monel 400) | Seawater and brine valves and pump parts; hydrofluoric acid duty | Enquire → |
ASTM A216 · A217
Which carbon and low-alloy steel grades are available?
WCB for general pressure castings, and the A217 chromium-molybdenum ladder from WC1 to C12 for high-temperature pressure parts. WCB and WC9 are in regular production; the rest are cast to order. IS and BS equivalents matched on request.
| Grade | ASTM | UNS / EN | Nominal type | Max service temp | Typical use | Enquire |
|---|---|---|---|---|---|---|
| WCB | A216 | J03002 · 1.0619 | Carbon steel | ~425 °C | Valve bodies, flanges and general pressure castings | Enquire → |
| WC1 | A217 | J12524 | C-0.5Mo | ~470 °C | Pressure parts a step above plain carbon steel | Enquire → |
| WC6 | A217 | J12072 · 1.7357 | 1.25Cr-0.5Mo | ~595 °C | Steam and high-temperature valve castings | Enquire → |
| WC9 | A217 | J21890 · 1.7379 | 2.25Cr-1Mo | ~595 °C | High-temperature pressure parts; refinery and power duty | Enquire → |
| C5 | A217 | J42045 | 5Cr-0.5Mo | ~650 °C | Sulphur-bearing refinery streams | Enquire → |
| C12 | A217 | J82090 | 9Cr-1Mo | ~650 °C | High-temperature, high-pressure refinery service | Enquire → |
Wear duty
Which wear-resistant grades are available?
Ni-hard and high-chromium irons and austenitic manganese steel, for parts that grind coal, clinker and ore. These are hardness-rated rather than temperature-rated grades, typically 400 to 500 BHN depending on grade and heat treatment.
| Grade family | Standard | Nominal type | Hardness | Typical use | Enquire |
|---|---|---|---|---|---|
| Ni-hard / high-chrome iron | IS 4771 | Ni-Cr and high-Cr white irons | ~400-500 BHN | Liner plates, grinding bowls and discs, bull rings, crusher parts | Enquire → |
| Manganese steel | IS 276 | Austenitic 12-14Mn (Hadfield) | Work-hardening | Hammer tips, impact blades, bucket tooth points | Enquire → |
Cross-reference
What are the cast equivalents of common wrought and EN grades?
If you are working from a wrought AISI grade or an EN (W.-Nr) number on a drawing, this table names the cast grade to order from Ni-Chrome, with its ASTM specification and UNS number. UNS and EN numbers are cross-references for matching a designation, not proof that two grades are identical, so name the standard your order needs.
| You have | Order this casting | ASTM | UNS / EN |
|---|---|---|---|
| 304 stainless · EN 1.4308 | CF8 | A351 / A743 | J92600 |
| 304L stainless · EN 1.4309 | CF3 | A351 / A743 | J92500 |
| 316 stainless · EN 1.4408 | CF8M | A351 / A743 | J92900 |
| 316L stainless · EN 1.4409 | CF3M | A351 / A743 | J92800 |
| 347 stainless · EN 1.4552 | CF8C | A351 / A744 | J92710 |
| Alloy 20 | CN7M | A351 / A743 / A744 | N08007 |
| Alloy 600 (nickel) | CY40 | A494 | N06040 |
| Alloy 625 (nickel) | CW-6MC | A494 | N26625 |
| Monel 400 | M35-1 | A494 | N24135 |
| 25Cr-12Ni heat-resistant · EN 1.4837 | HH | A297 | J93503 |
| 25Cr-20Ni-0.4C heat-resistant · EN 1.4848 | HK40 | A351 | J94204 |
| 26Cr-35Ni heat-resistant · EN 1.4857 | HP | A297 | N08705 |
| 25Cr-35Ni-Nb reformer grade · EN 1.4852 | HP-Nb | A297 mod. | 1.4852 |
| Carbon steel · EN 1.0619 | WCB | A216 | J03002 |
| 1.25Cr-0.5Mo steel · EN 1.7357 | WC6 | A217 | J12072 |
| 2.25Cr-1Mo steel · EN 1.7379 | WC9 | A217 | J21890 |
Do not see your designation? Ni-Chrome casts to ASTM, EN, IS and customer specifications; send the grade or the drawing and we will confirm the cast equivalent.
Choosing a grade
Which grade for which job?
Match the grade to the way the part fails. Heat and creep call for the chromium-nickel H-series, wet corrosion for the stainless C-series, pressure at steam temperatures for the Cr-Mo steels, abrasion for white irons and manganese steel; where iron-based grades run out, the cobalt and nickel bases take over. The table below maps the common jobs to the grades on this page; the notes after it explain why the same few elements decide the choice.
| The job | Start with | Step up when |
|---|---|---|
| Reformer & heater tube sheets, supports and hangers | HK40 · HH | HP-Nb where tube-metal temperature runs hotter or sections must be thinner |
| Reformer outlet manifolds & x-mas trees | CT-15C | HP-Nb where the designer specifies it |
| Oil-fired heater internals attacked by vanadium / sulphur fuel ash | 50Cr-50Ni-Nb | This is the step up; lower-chromium grades are what it replaces |
| Carburising furnace trays, fixtures and rolls | HT | HU or HX for the severest carburising and thermal cycling |
| Pump, valve and process castings in chemical or fertilizer duty | CF8 · CF8M | CF3M for as-welded chloride duty; CN7M for hot sulphuric acid |
| Corrosion past what stainless takes: caustic, seawater, HF, sour streams | CY40 · M35-1 | CW-6MC where corrosion and temperature combine |
| Valve trim and wear faces that must stay hard at red heat | Stellite-type 6 | Type 12 for more abrasion; type 21 for impact and thermal shock |
| Steam and pressure parts | WCB | WC6 or WC9 above ~425 °C; C5 or C12 in sulphur-bearing refinery streams |
| Grinding, crushing and sliding abrasion | Ni-hard / high-Cr iron | Manganese steel where heavy impact dominates |
Why are these parts cast rather than fabricated?
Because most of these compositions exist only as castings. A grade like HK40 carries around 0.4% carbon, well above what wrought 310 stainless is allowed, and that carbon forms the chromium-carbide network that holds the part against creep near 1,000 °C. The same carbon makes the alloy impractical to forge or roll, so there is no plate or bar to fabricate from. Casting also gives the shape directly: a tube sheet or a manifold comes out of the mould as one part, with no welded joints to become the weak points at temperature.
What do chromium, nickel, carbon and niobium each do?
Chromium forms the oxide skin that protects the metal, so resistance to oxidation, sulphur attack and fuel ash rises with chromium: 20% in HF, 28% in HD, 48-52% in 50Cr-50Ni-Nb. Nickel keeps the structure stable and strong at temperature and resists carburisation, which is why the carburising-service grades climb from 35% Ni in HT to 66% in HX. Carbon forms the carbides that resist creep; it is the main reason a cast H-grade outlasts its wrought cousin in stationary hot parts. Niobium ties carbon into fine, stable carbides, raising creep-rupture strength in HP-Nb and CT-15C and stopping sensitisation in CF8C. Molybdenum does two separate jobs: 2-3% in CF8M and CF3M resists chlorides and pitting, while the Cr-Mo pressure steels from WC1 to C12 use it for strength at steam temperatures. Cobalt holds its carbides hard at red heat, which is why a Stellite-type seat keeps its edge where hardened steel softens. Tungsten strengthens those same carbides, and it is what gives Super 22H its extra creep strength.
How should I read these tables?
As a shortlist, not a specification. The compositions shown are nominal types; the governing ranges sit in the ASTM standard named in each row, and the edition on your purchase order is what we certify against. UNS and EN numbers are cross-references for matching a designation on a drawing, not proof that two grades are identical, so name the standard you actually need. The service temperatures are indicative maxima in clean oxidising atmospheres; carburising gas, sulphur, fuel ash and thermal cycling all pull the practical limit down, and load-bearing parts are sized from creep-rupture data rather than a single maximum. When in doubt, send the operating conditions with the drawing and let the data decide the grade.
Documents on request
Need the full datasheet or a test certificate?
Pick the grade and ask; both are sent by email on request. The datasheet carries the specified composition range, mechanical properties and heat-treatment condition for the grade. A test certificate shows the ladle chemistry and mechanical results of an actual heat poured here, in the format that ships with an order.
No files are hosted here. Each request goes to our metallurgists and the documents come back to your inbox.
Specifying a grade
Buyer questions, answered
What is HK40 and where is it used?
HK40 is a 25Cr-20Ni austenitic heat-resistant casting grade to ASTM A351, UNS J94204, EN 1.4848. It keeps its creep strength near 1,000 °C, which makes it the classic grade for reformer and heater tube sheets, tube supports and hangers. Ni-Chrome pours HK40 in regular production.
HK40 or HP-Nb: which grade for reformer service?
HP-Nb, the niobium-modified 25Cr-35Ni grade (EN 1.4852), carries higher creep-rupture strength and roughly 50 °C more capability than HK40, so it is specified where tube-metal temperatures run hotter or where the designer wants thinner sections. HK40 remains the economical choice for tube sheets and supports at moderate severity. Send the operating temperature and we will confirm the grade.
Which grade resists fuel-ash corrosion from vanadium and sulphur?
50Cr-50Ni-Nb to ASTM A560, UNS R20501, the grade often specified as IN657. Its chromium level resists the molten vanadium and sodium-sulphate ash that attacks lower-chromium alloys in oil-fired heaters. Ni-Chrome casts it in regular production and is EIL-approved for critical petrochemical-grade alloys.
Which grade for reformer outlet manifolds and x-mas trees?
CT-15C, UNS N08151, a 20Cr-32Ni niobium-bearing grade to ASTM A351, is the usual specification, with HP-Nb where the designer calls for it. Both are in regular production at our works.
Can Ni-Chrome cast a grade that is not in these tables?
Usually, yes. These tables list the families our melt shop pours to ASTM, ASME, BS and IS standards; they are not a claim that every listed heat is on the shelf. Proprietary alloys such as the Stellite types, Super 22H or Nimonic-type compositions are cast to the published nominal chemistry or to the chemistry you specify. If your specification names a proprietary or borderline grade, send the chemistry and the standard and our metallurgists will come back with what it takes to cast it.
Have a grade and a drawing?
Name the grade, attach the drawing, and we'll come back with what it takes to cast it.