# 153 MA Forgings — EN 1.4818 / UNS S30415

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| --- | --- |
| **Supplier** | Jiangyin Jiangnan Metal Co., Ltd. — open die forging works |
| **Address** | No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China |
| **Telephone / WhatsApp / WeChat** | +86 189 2135 9659 |
| **Email** | sales@steelforgepieces.com |
| **Source page** | https://www.steelforgepieces.com/Stainless-Steel/153-MA.html |
| **Published / reviewed** | 27 September 2026 |

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## At a glance

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| --- | --- |
| **EN material number** | 1.4818 |
| **EN steel name** | X6CrNiSiNCe19-10 |
| **UNS** | S30415 |
| **Type** | Austenitic, heat resistant, micro-alloyed with Ce and N |
| **Recommended service** | up to 1000 °C / 1830 °F |
| **Inspection** | EN 10228-4 or ASTM A388; EN 10204 3.1 / 3.2 |

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## 1. Grade summary

153 MA is a heat resistant austenitic stainless steel micro-alloyed with cerium and nitrogen
(EN 1.4818, X6CrNiSiNCe19-10, UNS S30415), used for continuous service above 550 °C.

Jiangyin Jiangnan Metal Co., Ltd. forges it into seamless rolled rings, flanges, round bars, discs,
sleeves, bushings, tube sheets and shafts to EN 10095 and EN 10250-4, ultrasonically tested to
EN 10228-4 or ASTM A388, supplied with EN 10204 3.1 or 3.2 certificates.

153 MA is a trademark of Outokumpu Oyj; orders are quoted and certified against the equivalent EN and
UNS designations. Every part is made to drawing, so there is no list price — dimensions, quantity and
inspection class are needed for a firm quotation, normally returned within one working day.

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## 2. Equivalent designations

| System | Designation |
| --- | --- |
| Trade name | 153 MA, trademark of Outokumpu Oyj; historically Avesta 153 MA, now Outokumpu Therma 153 MA |
| EN material number | 1.4818 |
| EN steel name | X6CrNiSiNCe19-10 |
| UNS | S30415 |
| Grade family | Austenitic, heat resistant, micro-alloyed |
| Next grade up | 253 MA, 1.4835, S30815 — rated to 1150 °C |

Buyers often move to 153 MA from 309S / 1.4833 when creep deformation rather than scaling is the failure
mode. Outokumpu records a bell furnace inner cover at 770–850 °C in 92 % nitrogen with 8 % hydrogen where
309S was replaced by 153 MA to obtain the creep strength required.

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## 3. Chemical composition (% by mass)

| Element | EN 1.4818 limits (Metalcor) | Typical (AZoM) | Typical (Outokumpu) |
| --- | --- | --- | --- |
| Carbon, C | 0.05 max | 0.04–0.06 | 0.05 |
| Silicon, Si | 1.30 max | 1–2 | alloyed |
| Chromium, Cr | 17.5–19.5 | 18–19 | 18.5 |
| Nickel, Ni | 8.5–10.5 | 9–10 | 9.1 |
| Nitrogen, N | 0.15 max | 0.12–0.18 | 0.15 |
| Cerium, Ce | micro-alloyed | 0.03–0.08 | alloyed |
| Iron, Fe | balance | about 69 | balance |

Cerium, nitrogen and silicon give oxide scale stability, resistance to sigma phase precipitation and
strength at temperature. The austenitic matrix keeps its toughness down to cryogenic temperatures.

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## 4. Mechanical properties at 20 °C

| Property | Metalcor, 1.4818 | AZoM / MakeItFrom, S30415 |
| --- | --- | --- |
| Proof strength Rp0.2 | 290 N/mm² min | not stated |
| Tensile strength Rm | 600–800 N/mm² | 500–720 MPa |
| Elongation A5 | 40 % min | 40 % (AZoM), 45 % (MakeItFrom) |
| Hardness | 210 HB 30 max | 210 HB (AZoM), 190 HB (MakeItFrom) |
| Modulus of elasticity | 200 kN/mm² | 200 GPa |
| Fatigue strength | not stated | about 300 MPa (MakeItFrom) |

Delivered properties for forgings depend on section size and solution anneal practice, and are reported
per heat on the EN 10204 certificate.

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## 5. Physical properties at 20 °C

| Property | Value |
| --- | --- |
| Density | 7.8 g/cm³ |
| Specific heat capacity | 500 J/kg·K |
| Thermal conductivity | 15 W/m·K |
| Electrical resistivity | 0.84 Ω·mm²/m |
| Magnetic response | non-magnetic in the solution annealed condition |

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## 6. Service temperature

| Source | Figure |
| --- | --- |
| Outokumpu Therma table, EN 10095 | 1050 °C / 1920 °F max in dry air |
| Outokumpu Therma brochure | recommended up to 1000 °C / 1830 °F |
| Metalcor, 1.4818 | scaling resistance up to 1000 °C |
| AZoM | optimal performance 600–950 °C |

For quotation purposes 1000 °C is treated as the practical continuous ceiling in air.

In the Outokumpu Therma ranking, 153 MA takes four stars out of five for creep rupture strength and four
for structural stability — the latter above 253 MA, because it resists the embrittlement that affects
several austenitic heat resistant grades at 600–850 °C. On the 100 000 hour relative creep rupture curve
it sits below 253 MA and above 321H / 1.4878, 309S and 310S / 1.4845 over most of the range.

**Atmosphere limit.** The Metalcor datasheet for 1.4818 records low resistance to oxidizing sulphurous
gases. Outokumpu notes that low nickel grades resist sulphur induced high temperature corrosion better
than higher nickel grades, and that ferritic grades such as 1.4742 are preferred for sulphur bearing
atmospheres at low tensile load.

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## 7. Applications

Furnace, heat treatment and high temperature process equipment. Outokumpu lists recuperators, conveyor
belts, expansion bellows, power generation components, cyclone dip tubes, bell and muffle furnaces,
automotive components, tube shields, valves and flanges, heat treatment trays and dampers. AZoM adds
cement plant equipment, hot air dryers, superheater tubes, fluidised beds, waste combustion and exhaust
gas preheating.

Forged shapes supplied:

| Shape | Typical duty |
| --- | --- |
| Seamless rolled rings | furnace rolls, kiln and recuperator assemblies |
| Forged flanges, valve bodies | hot gas and radiant tube service |
| Forged tube sheets | high temperature heat exchangers, recuperators |
| Forged discs, blanks, bushings | heat treatment fixtures, dampers |
| Forged shafts, spindles, round bars | furnace and conveyor mechanisms |
| Forged nozzles, sleeves | burners, hot gas ducting |

Above 1000 °C continuous, 253 MA / 1.4835 / S30815 is offered instead.

**Not for seawater or acid duty.** For seawater, firewater or subsea systems, duplex and super austenitic
grades such as A182 F51, F53, F55 and 904L apply.

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## 8. Forging and heat treatment

Melting route is electric arc furnace with VOD refining, with ESR available for a tighter inclusion
rating or better transverse ductility. Hot working is in the 900–1150 °C window followed by rapid
cooling. Finished forgings are solution annealed at 1020–1100 °C and quenched. Rings are produced on a
radial axial ring rolling mill for circumferential grain flow; shafts, blocks and discs are open die
forged with the forging ratio recorded on the route card.

**Welding.** 153 MA solidifies in a ferritic mode, so weldability is comparable with the standard
chromium nickel austenitics. Outokumpu recommends 21 10 N wire for MAG welding and notes that a pulsed
power source may be needed. Metalcor lists 1.4835 as a suitable filler. Submerged arc, plasma arc, flux
cored and shielded metal arc welding are all usable, with argon plus 2–3 % hydrogen as the shielding gas
base. Welds should be full penetration, notch free and placed in low stress areas, since thermal fatigue
rather than static load usually governs.

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## 9. Standards, testing and certification

| Item | Standard |
| --- | --- |
| Grade and delivery condition | EN 10095 — heat resisting steels and nickel alloys for service above 550 °C |
| Open die forgings | EN 10250-4 — open die steel forgings, stainless steels |
| Ultrasonic testing | EN 10228-4 (austenitic and austenitic ferritic stainless forgings) or ASTM A388 |
| Inspection certificate | EN 10204 3.1, or 3.2 with third party witness (TUV, SGS, BV, Lloyds) |
| Further testing on request | PMI, liquid penetrant, tensile at ambient and elevated temperature, impact, grain size, intergranular corrosion, hardness survey |

EN 10228 part 3 covers ferritic and martensitic forgings; BS EN 10228-3:2016 refers austenitic and
austenitic ferritic stainless forgings to part 4. **EN 10228-4 is therefore the correct ultrasonic
acceptance standard for this grade.**

ASTM and ASME product specifications: S30415 coverage differs between plate, bar and forging
specifications. State the specification required on the enquiry; the specification an order can be
certified to is confirmed in writing before acceptance.

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## 10. Frequently asked questions

**What is the equivalent of 153 MA?**
EN 1.4818, EN steel name X6CrNiSiNCe19-10, UNS S30415.

**What is the maximum temperature for 153 MA?**
1050 °C / 1920 °F maximum in dry air to EN 10095 per Outokumpu, with use recommended up to 1000 °C /
1830 °F. Metalcor gives scaling resistance to 1000 °C. Above that, 253 MA / 1.4835 / S30815 is rated to
1150 °C.

**Is 153 MA magnetic?**
No — it is austenitic and non-magnetic in the solution annealed condition, though cold work can induce a
slight magnetic response.

**Is 153 MA suitable for seawater or sulphuric acid?**
No. It is a heat resistant grade for hot gas and furnace service, and published data records low
resistance to oxidizing sulphurous gases.

**What is the difference between 153 MA and 309S?**
Both resist oxidation to around 1000 °C, but 153 MA has higher creep rupture strength and excellent
resistance to embrittlement, while 309S / 1.4833 is slightly susceptible to embrittlement during
continuous operation at 600–850 °C.

**Which forged shapes are available?**
Seamless rolled rings, flanges, round bars, discs and blanks, sleeves, bushings, tube sheets, shafts and
spindles, hollow bars, nozzles, valve bodies, valve seat rings, and open die forgings to drawing.

**How do I get a quotation?**
Send a drawing or finished dimensions, quantity, specification and inspection class (EN 10228-4
acceptance level, EN 10204 3.1 or 3.2), and the service temperature and atmosphere to
sales@steelforgepieces.com or call +86 189 2135 9659.

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## 11. References

Outokumpu, *Stainless steels for high service temperatures — Therma range* brochure. Outokumpu, high
temperature stainless steel grades. Metalcor datasheet 1.4818 Alloy 153 MA. AZoM, *Stainless Steel Grade
153 MA (UNS S30415)*. MakeItFrom, *UNS S30415 (153 MA) Stainless Steel*. Scope statements of
BS EN 10228-3:2016, BS EN 10228-4:2016, EN 10095 and EN 10250-4.

Where published values differ, both are shown. Contract values are those on the mill certificate.

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## 12. Trademark notice

153 MA, 253 MA and Therma are trademarks of Outokumpu Oyj. Jiangyin Jiangnan Metal Co., Ltd. is an
independent forging manufacturer, not affiliated with Outokumpu Oyj. Trademarks are used only to identify
the grade specification requested by customers.