1.4818 Forgings: X6CrNiSiNCe19-10 / UNS S30415 Heat-Resistant Stainless Steel
Open-die forged rings, flanges, bars, discs, shafts, sleeves and tube sheets in EN 1.4818, made to drawing.
Jiangyin Jiangnan Metal Co., Ltd., open-die forging factory, Jiangyin, Jiangsu, China. Page reviewed 25 September 2026. Request a quotation
EN 1.4818 is an austenitic heat-resistant stainless steel. Its EN designation is X6CrNiSiNCe19-10 and its UNS number is S30415. The composition runs 18-20% chromium and 9-11% nickel, with 1-2% silicon, 0.12-0.20% nitrogen and 0.03-0.08% cerium. Silicon and cerium improve how well the oxide scale stays attached to the metal during thermal cycling. Nitrogen raises strength without adding carbon. The grade resists scaling in air to about 1000°C (1832°F), has a maximum application temperature near 1050°C (1922°F), and is normally applied in the 600-950°C range. Its commercial trade name is 153 MA.
Jiangyin Jiangnan Metal Co., Ltd. supplies 1.4818 as open-die forgings and seamless rolled rings made to drawing, with EN 10204 3.1 or 3.2 certification and ultrasonic testing to EN 10228-3, SEP 1921 or ASTM A388.
- EN number1.4818
- EN nameX6CrNiSiNCe19-10
- UNSS30415
- Trade name153 MA
- Max. service temp. in air1050°C / 1922°F
- Density7.8 g/cm³
- Tensile strength (+AT)600-800 MPa
- Proof strength Rp0.2290 MPa min.
What 1.4818 is
1.4818 is a heat-resistant austenitic chromium-nickel stainless steel covered by EN 10095 (Heat resisting steels and nickel alloys) and listed in EN 10088-1. The EN name X6CrNiSiNCe19-10 states the alloy design: about 0.06% carbon, then chromium, nickel, silicon, nitrogen and cerium, at nominal levels of 19% Cr and 10% Ni.
It sits between the common 18/8 austenitics such as 1.4301 (304) and the 25/20 grades such as 1.4845 (310S). Against 304 it gains roughly 150-200°C of service temperature without the nickel content of a 310-type alloy. Three additions account for the difference:
- Cerium, 0.03-0.08%. A rare-earth addition that improves adhesion of the chromium oxide scale. The scale stays attached through heating and cooling cycles rather than spalling off, and it is scale loss that consumes chromium and ends the life of most heat-resistant parts.
- Silicon, 1.00-2.00%. Forms a silica sub-layer under the chromia scale, which slows oxygen ingress and helps in carburising atmospheres.
- Nitrogen, 0.12-0.20%. A solid-solution strengthener that raises strength at room and elevated temperature and improves creep resistance. Carbon stays low enough to limit sensitisation.
The composition also resists sigma-phase precipitation better than several higher-silicon and higher-chromium heat-resistant grades, so parts keep useful toughness after long exposure. The structure is fully austenitic: non-magnetic in the solution-annealed condition, tough at cryogenic temperatures, and not hardenable by heat treatment.
Grade selection note. 1.4818 is a heat-resistant grade, not a corrosion-resistant one. It contains no molybdenum, and its pitting and crevice resistance is on the level of 304. It should not be specified for seawater, desalination plant piping, firewater systems, subsea equipment, or sulphuric and other mineral acids. Those duties call for 6% Mo super-austenitics such as 1.4547 (S31254), super-duplex grades such as 1.4410 (S32750), or nickel alloys such as Alloy 625. Resistance to oxidising sulphurous gases at high temperature is also limited. If an enquiry is driven by corrosion rather than temperature, send the operating conditions and we will quote the correct grade.
Equivalent grades and applicable standards
| System or country | Designation |
|---|---|
| EN number, Europe | 1.4818 |
| EN name, Europe | X6CrNiSiNCe19-10 |
| UNS, USA | S30415 |
| SS, Sweden | 2372 |
| ISO 15510 | 4818-304-15-E |
| Trade name | 153 MA |
| Also written as | 1.4818 steel, DIN 1.4818, W.Nr. 1.4818, WNr 1.4818, X6CrNiSiNCe 19-10, Alloy 153MA |
| Standard | Scope |
|---|---|
| EN 10095 | Heat resisting steels and nickel alloys; chemistry and properties for 1.4818 |
| EN 10088-1 | Stainless steels, list of stainless steels |
| EN 10296-2 | Welded circular tubes for mechanical and general engineering, stainless steel |
| EN 10222-5 | Steel forgings for pressure purposes, austenitic stainless steels |
| EN 10250-4 | Open-die steel forgings for general engineering, stainless steels |
| EN 10204 | Inspection documents, type 3.1 and type 3.2 |
| EN 10228-3, SEP 1921, ASTM A388 | Ultrasonic examination of steel forgings |
153 MA is a trademark of Outokumpu, used here to identify the grade. Jiangyin Jiangnan Metal Co., Ltd. is not affiliated with or licensed by Outokumpu.
Chemical composition
Chemical composition of 1.4818 to EN 10095, in weight percent. Iron makes up the balance, about 68-70%.
| Element | Symbol | Content, % |
|---|---|---|
| Carbon | C | 0.04 - 0.08 |
| Silicon | Si | 1.00 - 2.00 |
| Manganese | Mn | 1.00 max |
| Phosphorus | P | 0.045 max |
| Sulphur | S | 0.015 max |
| Chromium | Cr | 18.00 - 20.00 |
| Nickel | Ni | 9.00 - 11.00 |
| Nitrogen | N | 0.12 - 0.20 |
| Cerium | Ce | 0.03 - 0.08 |
| Iron | Fe | Balance, about 68 - 70 |
We melt 1.4818 by EAF plus AOD or VOD. ESR (electroslag remelting) is available where the drawing, the section size or the NDT acceptance class calls for improved cleanliness and a more uniform structure. Remelting is quoted as an option rather than applied by default, since on many furnace-component geometries it adds cost without adding service life.
Mechanical properties
Values below are for the solution-annealed (+AT) condition at room temperature to EN 10095. Forgings are supplied solution annealed unless the order states otherwise. Results for a given forging depend on section size and are reported on the EN 10204 certificate for that heat and heat-treatment lot.
| Property | Metric | Imperial |
|---|---|---|
| Tensile strength, Rm | 600 - 800 MPa | 87 - 116 ksi |
| 0.2% proof strength, Rp0.2 | 290 MPa min. | 42 ksi min. |
| Elongation at fracture, A | 30 - 40% min. | 30 - 40% min. |
| Hardness, Brinell | 210 HB max. | 210 HB max. |
| Modulus of elasticity, 20°C | about 200 GPa | about 29,000 ksi |
The alloy is austenitic, so it work-hardens and does not respond to quench and temper. Strength cannot be raised by heat treatment. Where more strength is needed at temperature, the answer is a larger section or a different alloy.
Physical properties
| Property | Value |
|---|---|
| Density | 7.8 g/cm³ (0.282 lb/in³) |
| Structure | Fully austenitic, non-magnetic in +AT condition |
| Maximum application temperature in air | 1050°C (1922°F) |
| Continuous scaling resistance in air | to about 1000°C (1832°F) |
| Normal working range | 600 - 950°C (1112 - 1742°F) |
| Response to heat treatment | Not hardenable, supplied solution annealed |
High-temperature behaviour
Where the grade works
- Cyclic oxidation in air. The cerium-stabilised oxide is the main advantage. In furnace fixtures that heat and cool daily, 1.4818 normally outlasts 304 and 321 because the scale does not spall on each cycle.
- Carburising and nitriding atmospheres. The silicon sub-scale gives useful resistance in low-oxygen, carbon-bearing gas, which covers most heat-treatment and petrochemical furnace work.
- Structural stability after long exposure. Resistance to sigma-phase precipitation is better than in several higher-alloy heat-resistant grades, so parts stay repairable and reasonably tough after years in service.
- Low-temperature toughness. The austenitic structure holds impact toughness below zero, which matters for parts that cycle between ambient and elevated temperature.
Where it does not
- Oxidising sulphurous gases. Resistance is low. For sulphur-bearing hot gas, 1.4841 (314) or a dedicated grade is the correct choice.
- Aqueous corrosion. With no molybdenum, pitting and crevice resistance is on the level of 304. Chloride-bearing water, seawater and acids are out of scope.
- Above 1050°C. Past the maximum application temperature, move to 1.4835 (S30815), 1.4845 (310S), 1.4854 (S35315) or a nickel-base alloy such as Inconel 601 or Incoloy 800H.
- Sustained load at temperature. Creep governs design above roughly 550°C. Wall thickness has to come from creep-rupture data for the intended life, not from room-temperature tensile values.
1.4818 compared with other heat-resistant grades
The table below covers the comparison buyers usually need when deciding whether 1.4818 is sufficient or whether a higher grade is justified.
| Grade | UNS | Cr % | Ni % | Si % | Max. temp. | When to choose it |
|---|---|---|---|---|---|---|
| 1.4818 (153 MA) | S30415 | 18-20 | 9-11 | 1.0-2.0 | about 1050°C | Cyclic service to about 1000°C, at close to 304 alloy cost |
| 1.4301 (304) | S30400 | 17.5-19.5 | 8-10.5 | 1.0 max | about 870°C | General service, scale spalls under thermal cycling |
| 1.4835 (253 MA) | S30815 | 20-22 | 10-12 | 1.4-2.5 | about 1150°C | Same alloy design one step hotter, higher creep strength |
| 1.4845 (310S) | S31008 | 24-26 | 19-22 | 1.5 max | about 1050°C | Continuous rather than cyclic service, higher nickel cost |
| 1.4841 (314) | S31400 | 24-26 | 19-22 | 1.5-2.5 | about 1100°C | Sulphur-bearing hot gases, lower thermal expansion |
| Incoloy 800H | N08810 | 19-23 | 30-35 | 1.0 max | above 1100°C | Code-stamped pressure parts and long-life creep service |
1.4818 forged products
Every item listed is made to the customer drawing or specification. Shapes are produced by open-die forging and ring rolling rather than cut from stock plate or bar.
| Product form | Size range | Notes |
|---|---|---|
| Seamless rolled rings and forged rings | OD 200 - 4000 mm, height to 1000 mm | Radial-axial ring rolled, rectangular, stepped or profiled section |
| Forged flanges | OD 100 - 3000 mm | WN, SO, blind, lap-joint, orifice, to ASME B16.5, B16.47, EN 1092-1 or custom |
| Forged round bars | Dia. 60 - 1000 mm | Forged, peeled or rough-turned, cut to length |
| Forged discs and disks | OD 150 - 2500 mm | Solid or bored, upset forged for radial grain flow |
| Forged shafts and stepped shafts | Dia. 80 - 900 mm, length to 6000 mm | Includes eccentric and crank geometries |
| Forged sleeves and bushings | OD 100 - 1500 mm | Bored and rough-machined, ready for finish grinding |
| Forged hollow bars and tubes | OD 150 - 1200 mm | Trepanned or expanded, heavy wall |
| Forged tube sheets | OD to 3000 mm, thickness to 400 mm | Drilled to drawing on request |
| Forged blocks, slabs and rectangles | To 5000 kg per piece | Sawn to size |
| Valve bodies, valve seat rings and stems | To 2000 kg per piece | For ball, gate, globe, check and plug valves |
| Spindles, gears, nozzles and rolls | To 5000 kg per piece | Near-net or fully machined |
Manufacturing route
- Melting. EAF plus AOD or VOD. ESR on request for demanding cleanliness or NDT classes.
- Forging. Open-die forging or radial-axial ring rolling, with a controlled forging reduction ratio to break down the cast structure and give grain flow that follows the part contour.
- Solution annealing (+AT). Heat, hold and rapid quench to dissolve precipitates and restore the austenitic structure. Furnace charts are recorded and supplied.
- Machining. Rough or finish machining to drawing, including boring, drilling and turning.
- Testing and inspection. Chemistry, mechanical testing, ultrasonic examination, PMI and dimensional report.
- Marking and packing. Heat number and item mark hard-stamped or vibro-etched, export seaworthy packing.
Testing, inspection and certification
- Chemical analysis. Spectrometric, per heat, including cerium and nitrogen.
- Mechanical testing. Tensile, hardness, and impact testing where the specification requires it.
- Ultrasonic testing. To EN 10228-3, SEP 1921 class C, D or E, or ASTM A388, with the acceptance class stated on the order.
- PMI. Positive material identification on finished parts where specified.
- Intergranular corrosion testing. ASTM A262 practice E or EN ISO 3651-2 on request.
- Certification. EN 10204 3.1 as standard, EN 10204 3.2 witnessed by TUV, BV, SGS, Lloyd's or the customer inspector.
Typical applications
1.4818 is selected where parts run hot, cycle often, and sit in an oxidising or carburising atmosphere.
- Industrial furnaces and heat treatment. Muffle and bell furnace internals, retorts, radiant tubes, burner components, roller hearth rolls, heat-treatment trays, baskets and fixtures, charging arms, furnace rolls and roller shafts.
- Hot-side structural hardware. Refractory anchors and hangers, tube shields, damper shafts and blades, expansion joint and bellows components.
- Petrochemical and refining. Fired heater internals, cyclone dip tubes, cyclone and separator components in FCC service, hot-gas ducting flanges, thermowell and nozzle forgings.
- Cement, lime and mineral processing. Rotary kiln nose-ring and inlet segments, cooler grate parts, preheater components, impact separators.
- Power generation and waste to energy. Boiler support forgings, soot-blower components, hot gas-path fixtures, incinerator grate and hanger parts.
- Process equipment. Heat-exchanger tube sheets and shell flanges for hot-gas duty, conveyor belt link pins and rollers for continuous furnaces, sinter plant hardware.
- Automotive and engine test. Exhaust manifold and hot-gas test rig components.
Forging, welding and machining
Hot forging
Forge from about 1150°C and finish above 950°C, then solution anneal. The silicon and nitrogen make the alloy stiffer to deform than 304, so press capacity and reheat cycles need to allow for it. Reheating has to be uniform, since local cold spots crack at the die contact.
Welding
1.4818 welds by GTAW, GMAW, SMAW and SAW. Use a matching or over-alloyed filler: a 22/12 type consumable such as ER309 or ER309L, or a matching 153 MA type filler where available. No preheat is required. Keep interpass temperature moderate and heat input controlled to limit distortion. Post-weld solution annealing is normally unnecessary, though it can be specified for demanding cyclic service.
Machining
Machinability is comparable to other austenitic stainless steels and somewhat tougher than 304 because of the nitrogen. Use rigid setups, sharp positive-rake tooling, flood coolant, low to moderate surface speed and a heavy, consistent feed so the tool cuts under the work-hardened layer instead of rubbing on it. Avoid dwelling and avoid interrupted light cuts.
How to order
Send a drawing or a description and we will quote. The more of the following you supply, the firmer the quotation:
- Grade and specification, for example EN 1.4818 to EN 10095, solution annealed.
- Product form and dimensions, or a 2D drawing or STEP file.
- Quantity and required delivery date.
- Machining condition: as forged, rough machined with allowance, or finish machined.
- NDT requirement and acceptance class to EN 10228-3, SEP 1921 or ASTM A388.
- Certification required, EN 10204 3.1 or 3.2, and which third party.
- Additional testing: impact, IGC, PMI, hardness mapping, grain size.
- Marking, preservation and packing requirements.
Request a quotation for 1.4818 forgings
- Company
- Jiangyin Jiangnan Metal Co., Ltd., open-die forging factory
- Address
- No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China
- Phone, WhatsApp, WeChat
- +86 189 2135 9659
- sales@steelforgepieces.com
- Website
- www.steelforgepieces.com
- We manufacture
- Open-die forgings and seamless rolled rings in stainless steel, nickel alloy, carbon steel, alloy steel and tool steel
Frequently asked questions
What is 1.4818 stainless steel?
1.4818 is an austenitic heat-resistant stainless steel covered by EN 10095 under the name X6CrNiSiNCe19-10. It contains 18-20% chromium, 9-11% nickel, 1-2% silicon, 0.12-0.20% nitrogen and 0.03-0.08% cerium, with iron as the balance. The silicon and cerium give an oxide scale that resists spalling during thermal cycling, which is why the grade is used for furnace and heat-treatment components.
What is the UNS equivalent of 1.4818?
The UNS equivalent of EN 1.4818 is S30415. The Swedish designation is SS 2372 and the ISO 15510 reference is 4818-304-15-E. The trade name is 153 MA.
Is 1.4818 the same as 153 MA?
Yes. 153 MA is the trade name for the grade standardised as EN 1.4818 and UNS S30415. They are the same alloy. 153 MA is a trademark of Outokumpu. Jiangyin Jiangnan Metal Co., Ltd. supplies material to the EN 1.4818 specification and is not affiliated with Outokumpu.
What is the maximum service temperature of 1.4818?
The maximum application temperature in air is about 1050°C (1922°F). Continuous scaling resistance in air holds to about 1000°C (1832°F), and the normal working range is 600 to 950°C. Above 1050°C, move to 1.4835 (S30815), 1.4845 (310S), 1.4854 (S35315) or a nickel-base alloy. Under sustained load above roughly 550°C, creep rather than scaling governs the design.
What is the difference between 1.4818 and 1.4835?
Both use silicon, nitrogen and cerium added to an austenitic base for scale adhesion and strength. 1.4835 (S30815, 253 MA) is the higher-alloy version at 20-22% chromium and 10-12% nickel, with a maximum service temperature near 1150°C and higher creep strength. 1.4818 is the lower-cost choice where service stays below about 1000°C. For parts running above that, or carrying sustained load at temperature, 1.4835 is usually the correct specification.
Can 1.4818 be used in seawater or acid service?
No. 1.4818 contains no molybdenum, so its resistance to pitting, crevice corrosion and chloride stress corrosion cracking is on the level of 304. It is not suitable for seawater, desalination plants, firewater or subsea systems, nor for sulphuric or other mineral acids. Resistance to oxidising sulphurous gases at high temperature is also limited. For those duties, specify a 6% Mo super-austenitic such as 1.4547 (S31254), a super-duplex such as 1.4410 (S32750) or 1.4501 (S32760), or a nickel alloy such as Alloy 625 or Hastelloy C-276.
Is 1.4818 magnetic?
In the solution-annealed condition 1.4818 is fully austenitic and effectively non-magnetic. Heavy cold work can produce a small amount of deformation martensite and a slight magnetic response, which is not expected in hot-forged and solution-annealed parts.
Can 1.4818 be hardened by heat treatment?
No. As an austenitic grade it does not respond to quench and temper hardening. It is supplied solution annealed (+AT) and strengthens only by cold work. Where higher strength is required, the answer is a larger section or a different alloy family such as a precipitation-hardening or nickel-base grade.
What forged shapes are available in 1.4818?
Seamless rolled rings, forged rings, flanges, round bars, discs and disks, shafts and stepped shafts, sleeves, bushings, hollow bars and forged tubes, tube sheets, blocks and slabs, valve bodies and seat rings, spindles, gears, nozzles and rolls, all produced to the customer drawing by open-die forging or radial-axial ring rolling.
What certificates and testing are supplied with 1.4818 forgings?
EN 10204 3.1 certification is supplied as standard, and EN 10204 3.2 with third-party witness by TUV, BV, SGS, Lloyd's or the customer inspector on request. Ultrasonic examination is carried out to EN 10228-3, SEP 1921 or ASTM A388 at the acceptance class stated on the order. Chemical analysis, mechanical testing, PMI, intergranular corrosion testing to ASTM A262 practice E and dimensional reports are available.
What is the lead time for 1.4818 forgings?
Lead time depends on the size of the part, whether it is supplied as forged or machined, and the testing required. Send the drawing and quantity and we will confirm a delivery date with the quotation.
Is there a minimum order quantity?
We produce single pieces as well as series quantities. Because 1.4818 is melted and forged to order rather than taken from stock, small quantities carry a minimum charge. Ask for a piece price and a break-even quantity when you send the drawing.
About the manufacturer
Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China. The company produces open-die forgings and seamless rolled rings in stainless steel, nickel alloy, carbon steel, alloy steel and tool steel, supplied to customer drawings with EN 10204 3.1 or 3.2 certification.
Jiangyin sits in the special-steel cluster of southern Jiangsu, within road distance of Wuxi and Shanghai and close to Zhangjiagang and Shanghai ports. Enquiries in English are handled by the sales team at sales@steelforgepieces.com or +86 189 2135 9659.
Related grades
Standards and references
- EN 10095, Heat resisting steels and nickel alloys
- EN 10088-1, Stainless steels: list of stainless steels
- EN 10222-5, Steel forgings for pressure purposes: stainless steels
- EN 10250-4, Open-die steel forgings for general engineering: stainless steels
- EN 10204, Types of inspection documents
- EN 10228-3, SEP 1921, ASTM A388, Ultrasonic examination of forgings
- ISO 15510, Stainless steels: chemical composition
- ASTM A262, Detecting susceptibility to intergranular attack in austenitic stainless steels
Property values on this page are nominal figures taken from the standards above and are given for engineering guidance. They are not a warranty. Values for a specific delivery are those on the EN 10204 certificate issued for that heat and heat-treatment lot. Suitability for a given application remains the responsibility of the designer.
Page last updated 25 September 2026 by the technical sales team, Jiangyin Jiangnan Metal Co., Ltd.