# UNS S30415 Forgings (EN 1.4818 / X6CrNiSiNCe19-10 / 153 MA)

**UNS S30415 is a heat resistant austenitic chromium-nickel stainless steel, equivalent to EN 1.4818 / X6CrNiSiNCe19-10 and Swedish SS 2372, and sold under the trade name 153 MA. Jiangyin Jiangnan Metal Co., Ltd. forges it into rolled rings, flanges, shafts, discs, tube sheets, sleeves and bars, melted and forged in one works in Jiangyin, Jiangsu, China.**

Silicon, nitrogen and cerium additions give the grade oxide stability, resistance to sigma phase precipitation and strength at high temperature. The austenitic structure stays tough down to cryogenic temperatures. The grade is resistant to scaling in air up to 1000 C, with optimal performance between 600 and 950 C.

It is a heat resistant grade, not a corrosion resistant one. It contains no molybdenum, published data note low resistance to oxidising sulphuric gases, and the useful ceiling drops to about 420 C where wet corrosion rather than oxidation governs. For seawater, subsea or chloride duty use duplex or super duplex grades such as A182 F51, F53 and F55, or high molybdenum austenitics such as F44 and 904L.

## Grade record

| Field | Detail |
|---|---|
| UNS | S30415 |
| EN material number | 1.4818 |
| EN designation | X6CrNiSiNCe19-10 |
| Sweden | SS 2372 |
| Trade name | 153 MA, Avesta 153 MA |
| Structure | Austenitic Cr-Ni with Si, N and Ce |
| Resistant to scaling in air | up to 1000 C |
| Optimal performance | 600 to 950 C |
| Max mechanical service temperature | about 940 C |
| Max temperature, wet corrosion governing | about 420 C |
| Not suitable for | oxidising sulphuric gases, seawater and chloride service |

## Chemical composition, percent by weight

| Element | EN 1.4818 limits | 153 MA typical analysis |
|---|---|---|
| C | max 0.05 | 0.04 to 0.06 |
| Si | max 1.30 | 1.0 to 2.0 |
| Mn | not stated | 0 to 0.8 |
| Cr | 17.5 to 19.5 | 18 to 19 |
| Ni | 8.5 to 10.5 | 9 to 10 |
| N | 0.15 | 0.12 to 0.18 |
| Ce | not stated | 0.03 to 0.08 |
| Fe | balance | balance, about 69 |

Sources differ on silicon: the 1.4818 data sheet caps it at 1.30 percent, the 153 MA typical analysis is quoted as 1.0 to 2.0 percent. Confirm against the governing standard.

## Mechanical properties at 20 C, annealed

| Property | EN 1.4818 data sheet | Other published values |
|---|---|---|
| Proof strength Rp0.2 | 290 N/mm2 | 330 MPa |
| Tensile strength Rm | 600 to 800 N/mm2 | 500 to 720 MPa; 670 MPa |
| Elongation A5 | 40 percent | 40 to 45 percent |
| Hardness HB30 | 210 | 190 HB, about 84 HRB |
| Modulus of elasticity | 200 kN/mm2 | 200 GPa |
| Shear modulus | not stated | 77 GPa |
| Shear strength | not stated | 470 MPa |
| Fatigue strength | not stated | 300 MPa |
| Poisson ratio | not stated | 0.28 |

## Physical properties

| Property | Value |
|---|---|
| Density | 7.8 g/cm3 |
| Specific heat capacity at 20 C | 500 J/kg K; 480 J/kg K quoted elsewhere |
| Thermal conductivity at 20 C | 15 W/m K; 21 W/m K quoted elsewhere |
| Electrical resistivity | 0.84 ohm mm2/m |
| Melting range | 1370 to 1410 C |
| Magnetic response | effectively non-magnetic when annealed |

## Fabrication

- Hot forming: 900 to 1150 C, followed by rapid cooling.
- Heat treatment: 1020 to 1100 C, rapid cooling.
- Cold forming: good.
- Welding: submerged arc, plasma arc, flux cored arc and shielded metal arc. Argon with 2 to 3 percent hydrogen as the base of shielding and welding gases. Suitable matching filler metal 1.4835.
- Machining: work hardens more readily than plain 304. Use rigid setups, sharp tools, positive feed and generous coolant.

## Applications

Furnace and apparatus engineering, cement industry, hot air dryers, recuperators, superheater tubes and fluidised beds, waste combustion, preheating of exhaust gas, handling of hydrocarbon gases. High temperature austenitic grades of this family also serve the iron, steel and other metallurgical industries, general engineering and energy conversion plants. Above about 550 C, creep strength is normally the dimensioning property.

Typical forged parts: furnace support and retaining rings, burner and nozzle components, fan and roller shafts, recuperator tube sheets, hot gas duct flanges, sleeves and bushings.

## Forged products and size envelope

| Product | Size limit |
|---|---|
| Seamless rolled rings | OD 50 mm to OD 6,000 mm |
| Forged shafts | up to 14,000 mm turned length |
| Discs, tube sheets, blocks | up to 5,000 mm machined diameter |
| Bored cylinders and sleeves | up to 1,600 mm dia x 10,000 mm |
| Single piece weight | up to 30,000 kg |

Also forged flanges, bars, blocks, valve bodies, bonnets, stems and seat rings.

## Testing and certification

Melting by electric arc furnace with ladle refining and vacuum oxygen decarburisation, heat size up to 60 t, with electroslag remelting where required. Ultrasonic examination to EN 10228-3, SEP 1921 or ASTM A388. Dye penetrant, positive material identification, intergranular corrosion testing, impact and elevated temperature tensile testing available. Certificates to EN 10204 3.1 or 3.2 with third party witness. Works approvals: CCS, BV, DNV, LR, NK.

## Supplier

| Field | Detail |
|---|---|
| Company | Jiangyin Jiangnan Metal Co., Ltd. |
| Business | Integrated melting works, open-die forge and ring rolling mill |
| Established | 1997 |
| Employees | 460 |
| Plant | No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China |
| Telephone | +86 189 2135 9659 |
| Email | sales@steelforgepieces.com |
| Page | https://www.steelforgepieces.com/Stainless-Steel/UNS-S30415.html |
| Minimum order | 10 kg, no minimum piece count |
| Lead time | 20 to 60 days |

## Sources

Metalcor data sheet 1.4818 / Alloy 153 MA. AZoM, Stainless Steel Grade 153 MA (UNS S30415). MakeItFrom, UNS S30415 (153 MA) Stainless Steel. Outokumpu, high temperature stainless steel grades. Steelnumber, S30415 equivalent grades.

Page last reviewed 5 October 2026 by the technical department of Jiangyin Jiangnan Metal Co., Ltd.