Stainless Steel 1.4919 AT-CG
Heat-treated state
EN 1.4919
AT-CG = high-temperature solution anneal, coarse grain
Anneal at the upper end (≈1100–1150 °C) to coarsen grain (ASTM 2–5) for maximum creep-rupture strength in long-term 550–650 °C steam service.
Values for the AT-CG condition
Other 1.4919 tempers and conditions
1.4919 is listed in 5 conditions; see the grade overview at 1.4919.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AT-CGThis page High-temperature solution anneal, coarse grain | Anneal at the upper end (≈1100–1150 °C) to coarsen grain (ASTM 2–5) for maximum creep-rupture strength in long-term 550–650 °C steam service. | 240 | 550 | 45 | 150 HB | 2.3 % IACS |
Hot finished (rolled/forged) and solution annealed | Hot-finished plate, seamless tube and forgings in the annealed, pickled condition — the usual pressure-part supply form. | 265 | 575 | 45 | 165 HB | 2.3 % IACS |
ATDefault Solution annealed | Standard supply condition for tube, plate and forgings — maximum corrosion resistance and ductility, basis of EN creep-rupture data. | 270 | 580 | 48 | 160 HB | 2.3 % IACS |
Cold drawn | Cold-drawn bar or tube for higher yield strength and better surface/tolerance, e.g. high-temperature bolting blanks per EN 10269. | 480 | 700 | 25 | 19 HRC | 2.3 % IACS |
Cold worked, half hard tube/strip | Heavily cold-worked small-diameter tube or strip where strength, not creep life, governs; not used above ~400 °C. | 620 | 850 | 15 | 26 HRC | 2.2 % IACS |
What is 1.4919 AT-CG?
1.4919 AT-CG is 1.4919 heat treated to AT-CG — anneal at the upper end (≈1100–1150 °C) to coarsen grain (ASTM 2–5) for maximum creep-rupture strength in long-term 550–650 °C steam service. 1.4919 AT-CG has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 96% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 200 GPa (29 Msi). 1.4919 AT-CG has a density of 7.98 g/cm³ (0.288 lb/in³), heavier than 85% of stainless steel grades. It melts at 1,390°C (2,534 °F). AT is the default condition FabDigit quotes; AT-CG is available on request or by drawing note.
Advantages
- Forms and bends easily — 75/100, better than 87% of stainless steel grades
- Tough — resists crack growth — 200 MPa·√m (182 ksi·√in), better than 86% of stainless steel grades
- Ductile — tolerates forming and impact — 45%, better than 76% of stainless steel grades
Limitations
- Low strength — 240 MPa (34.8 ksi), worse than 96% of stainless steel grades
1.4919 AT-CG properties
Typical room-temperature values for 1.4919 AT-CG; 22 are specific to this condition. Other listed values are 1.4919 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4919 AT-CG has a density of 7.98 g/cm³ (0.288 lb/in³), heavier than 85% of stainless steel grades. It melts at 1,390°C (2,534 °F).
Mechanical16
1.4919 AT-CG has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 96% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
1.4919 AT-CG is rated for continuous service to 650°C (1,202 °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 16 µm/m·K (8.89 µin/in·°F).
Electrical3
1.4919 AT-CG conducts electricity at 2.3 % IACS, better than 55% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (68/100), better than 63% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4919 AT-CG takes about 53 MJ of energy and emits 5 kg of CO₂ — less than 67% of stainless steel grades. Typical recycled content is 60%.
Manufacturability7
1.4919 AT-CG's machinability is fair (42/100, better than 79% of stainless steel grades); weldability very good (72/100); formability very good (75/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4919 AT-CG
Is 1.4919 easy to machine?
Machines like 316 — gummy, work-hardening chip; use rigid setups, positive-rake coated carbide, 40–120 m/min, heavy feed and copious coolant to avoid glazing.
Can 1.4919 be welded?
Weldable by TIG/MIG/SAW with 316L/16-8-2 filler and low heat input; boron increases hot-cracking risk, so keep interpass < 150 °C, minimise restraint and control ferrite in the weld metal.
Can 1.4919 be formed, bent or molded?
Excellent cold formability with high work-hardening — allow extra springback and interstage anneal at 1050–1100 °C; hot work at 1150–1200 °C, finish above 900 °C, then solution anneal and quench.
What surface finishes work on 1.4919?
Pickle and passivate (HNO3/HF) after hot work or welding; electropolishing gives the best surface for steam/nuclear cleanliness. Anodising is not applicable.
1.4919 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 | 0.04 – 0.08 | 0.06 |
| Si | ≤ 0.75 | 0.4 |
| Mn | ≤ 2 | 1.5 |
| P | ≤ 0.04 | — |
| S | ≤ 0.02 | — |
| Cr | 16 – 18 | 17 |
| Ni | 12 – 14 | 13 |
| Mo | 2 – 2.5 | 2.25 |
| Bboron addition for grain-boundary strengthening / creep rupture life | 0 – 0.01 | 0 |
| N | ≤ 0.11 | 0.05 |
| Fe | balance | — |
1.4919 AT-CG — frequently asked
What is 1.4919 AT-CG used for?
1.4919 AT-CG is typically used for nuclear reactor internals, spent fuel storage baskets, neutron shielding components and chemical process equipment. In short: boron-modified 316 variant; neutron absorption with Mo corrosion resistance; nuclear specialty stock.
What is the yield strength of 1.4919 AT-CG?
1.4919 AT-CG has a typical yield strength of 240 MPa (34.8 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 96% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is 1.4919 AT-CG easy to machine?
Not especially — machinability is rated fair (42/100, better than 79% of stainless steel grades). Machines like 316 — gummy, work-hardening chip; use rigid setups, positive-rake coated carbide, 40–120 m/min, heavy feed and copious coolant to avoid glazing.
Can 1.4919 AT-CG be welded?
Yes — weldability is rated very good (72/100). Weldable by TIG/MIG/SAW with 316L/16-8-2 filler and low heat input; boron increases hot-cracking risk, so keep interpass < 150 °C, minimise restraint and control ferrite in the weld metal.
What surface finishes work on 1.4919 AT-CG?
Pickle and passivate (HNO3/HF) after hot work or welding; electropolishing gives the best surface for steam/nuclear cleanliness. Anodising is not applicable.
Can 1.4919 AT-CG be formed, bent or molded?
Excellent cold formability with high work-hardening — allow extra springback and interstage anneal at 1050–1100 °C; hot work at 1150–1200 °C, finish above 900 °C, then solution anneal and quench.
What is the maximum service temperature of 1.4919 AT-CG?
1.4919 AT-CG is rated for continuous use to about 650°C (1,202 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4919-AT and 1.4919 CW-HH?
AT is the default condition — standard supply condition for tube, plate and forgings — maximum corrosion resistance and ductility, basis of EN creep-rupture data. CW-HH: heavily cold-worked small-diameter tube or strip where strength, not creep life, governs; not used above ~400 °C. Yield strength is 270 MPa in AT versus 620 MPa in CW-HH.
Sources
- EN 10216-5 Seamless steel tubes for pressure purposes — stainless steel tubes — CEN (2021)
- EN 10222-5 Steel forgings for pressure purposes — martensitic, austenitic and austenitic-ferritic stainless steels — CEN (2017)
- EN 10269 Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties — CEN (2013)
- EN 10302 Creep resisting steels, nickel and cobalt alloys — CEN (2008)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials — ASM International (2005)
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.