Stainless Steel 253 MA Forged+SA
Heat-treated state
UNS S30815 · EN 1.4835, X9CrNiSiNCe21-9-2
Forged+SA = forged and solution annealed
For heavy sections, roller-hearth furnace rolls, grate bars and forged fittings where a homogeneous recrystallised structure is required.
Values for the Forged+SA condition
Other 253 MA tempers and conditions
253 MA is listed in 4 conditions; see the grade overview at 253 MA.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Forged+SAThis page Forged and solution annealed | For heavy sections, roller-hearth furnace rolls, grate bars and forged fittings where a homogeneous recrystallised structure is required. | 340 | 660 | 42 | 185 HB | 2 % IACS |
AnnealedDefault Solution Annealed (1050–1150 °C, rapid cool) | Standard stocked condition for plate, sheet, bar and tube destined for furnace and high-temperature service. | 350 | 680 | 45 | 180 HB | 2 % IACS |
As-welded deposit | Property level to assume for undiluted weld metal in fabricated furnace assemblies; slightly higher strength and lower ductility than base metal. | 420 | 660 | 32 | 195 HB | 2 % IACS |
Cold drawn | Choose for small-diameter bar and fastener stock needing closer tolerance and higher room-temperature strength; strength gain is lost after high-temperature service. | 560 | 800 | 25 | 24 HRC | 2 % IACS |
What is 253 MA Forged+SA?
253 MA Forged+SA is 253 MA heat treated to Forged+SA — for heavy sections, roller-hearth furnace rolls, grate bars and forged fittings where a homogeneous recrystallised structure is required. 253 MA Forged+SA has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 660 MPa (95.7 ksi) — weaker than 55% of stainless steel grades. Elongation at break is 42% and the elastic modulus is 200 GPa (29 Msi). 253 MA Forged+SA has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,370°C (2,498 °F). Annealed is the default condition FabDigit quotes; Forged+SA is available on request or by drawing note.
Advantages
- High service temperature — 1,100°C (2,012 °F), better than 96% of stainless steel grades
Limitations
- High embodied carbon — 5.6 kg CO₂/kg, worse than 83% of stainless steel grades
- Hard to polish — 60/100, worse than 80% of stainless steel grades
- Low electrical conductivity — 2 % IACS, worse than 77% of stainless steel grades
253 MA Forged+SA properties
Typical room-temperature values for 253 MA Forged+SA; 22 are specific to this condition. Other listed values are 253 MA reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
253 MA Forged+SA has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,370°C (2,498 °F).
Mechanical16
253 MA Forged+SA has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 660 MPa (95.7 ksi) — weaker than 55% of stainless steel grades. Elongation at break is 42% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
253 MA Forged+SA is rated for continuous service to 1,100°C (2,012 °F). It conducts heat at 15 W/m·K (8.67 BTU/hr·ft·°F), worse than 59% of stainless steel grades. Thermal expansion is 17 µm/m·K (9.44 µin/in·°F).
Electrical3
253 MA Forged+SA conducts electricity at 2 % IACS, worse than 77% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (66/100), better than 59% of stainless steel grades.
Sustainability4
Producing a kilogram of 253 MA Forged+SA takes about 56 MJ of energy and emits 5.6 kg of CO₂ — more than 59% of stainless steel grades. Typical recycled content is 55%.
Manufacturability6
253 MA Forged+SA's machinability is fair (36/100, better than 57% of stainless steel grades); weldability very good (72/100); formability fair (48/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 253 MA Forged+SA
Is 253 MA easy to machine?
Cut at ~70–80 % of 304 speeds with rigid setups, positive-rake coated carbide, heavy constant feed and generous coolant — the Si+N alloying makes it gummy and strongly work-hardening.
Can 253 MA be welded?
Readily welded by GTAW/GMAW/SMAW with matching 253 MA or 22.12.HT filler, low heat input, no preheat and no post-weld heat treatment required for most furnace fabrications.
Can 253 MA be formed, bent or molded?
Cold forms like a high-strength austenitic (allow ~30 % higher press loads and more springback than 304); hot forming 1150–900 °C followed by solution annealing at 1050–1150 °C and rapid cooling.
What surface finishes work on 253 MA?
Pickle in HNO3-HF or blast to remove high-temperature scale; passivates naturally, takes standard mechanical polishing but is not anodizable and rarely plated.
253 MA chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| C | 0.05 – 0.1 | 0.08 |
| Sikey scale former with Ce | 1.4 – 2 | 1.7 |
| Mn | ≤ 0.8 | 0.6 |
| P | ≤ 0.04 | — |
| S | ≤ 0.03 | — |
| Cr | 20 – 22 | 21 |
| Ni | 10 – 12 | 11 |
| Nraises proof and creep strength | 0.14 – 0.2 | 0.17 |
| Cerare-earth addition improving scale adhesion | 0.03 – 0.08 | 0.05 |
| Fe | balance | — |
253 MA Forged+SA — frequently asked
What is 253 MA Forged+SA used for?
253 MA Forged+SA is typically used for furnace rollers, boiler hangers, incinerator components and kiln parts. In short: scaling resistance to 1150 °C; creep-strong heat-resistant austenitic; matching filler available.
What is the yield strength of 253 MA Forged+SA?
253 MA Forged+SA has a typical yield strength of 340 MPa (49.3 ksi) and a tensile strength of 660 MPa (95.7 ksi) — weaker than 55% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is 253 MA Forged+SA easy to machine?
Not especially — machinability is rated fair (36/100, better than 57% of stainless steel grades). Cut at ~70–80 % of 304 speeds with rigid setups, positive-rake coated carbide, heavy constant feed and generous coolant — the Si+N alloying makes it gummy and strongly work-hardening.
Can 253 MA Forged+SA be welded?
Yes — weldability is rated very good (72/100). Readily welded by GTAW/GMAW/SMAW with matching 253 MA or 22.12.HT filler, low heat input, no preheat and no post-weld heat treatment required for most furnace fabrications.
What surface finishes work on 253 MA Forged+SA?
Pickle in HNO3-HF or blast to remove high-temperature scale; passivates naturally, takes standard mechanical polishing but is not anodizable and rarely plated.
Can 253 MA Forged+SA be formed, bent or molded?
Cold forms like a high-strength austenitic (allow ~30 % higher press loads and more springback than 304); hot forming 1150–900 °C followed by solution annealing at 1050–1150 °C and rapid cooling.
What is the maximum service temperature of 253 MA Forged+SA?
253 MA Forged+SA is rated for continuous use to about 1,100°C (2,012 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 253 MA Annealed and 253 MA-CD?
Annealed is the default condition — standard stocked condition for plate, sheet, bar and tube destined for furnace and high-temperature service. CD: choose for small-diameter bar and fastener stock needing closer tolerance and higher room-temperature strength; strength gain is lost after high-temperature service. Yield strength is 350 MPa in Annealed versus 560 MPa in CD.
Sources
- ASTM A240/A240M — Chromium and Chromium-Nickel Stainless Steel Plate, Sheet and Strip (UNS S30815) — ASTM International (2023)
- EN 10095 — Heat resisting steels and nickel alloys (1.4835) — CEN (1999)
- 253 MA heat-resistant austenitic stainless steel datasheet — Outokumpu (2022)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.