Stainless Steel 1.4552 HT-STAB
Heat-treated state
EN 1.4552 · UNS J92710 · ASTM A351 CF8C
Choose for long-term 425–815 °C service or highly aggressive nitric/polythionic acid duty, where carbon is deliberately tied up as NbC before service.
Values for the HT-STAB condition
Other 1.4552 tempers and conditions
1.4552 is listed in 5 conditions; see the grade overview at 1.4552.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
HTDefault Solution heat treated and quenched | Standard commercial supply condition: ≥1040 °C solution treat and rapid quench, giving fully dissolved matrix with maximum ductility and corrosion resistance. | 250 | 530 | 39 | 149 HB | — |
hot isostatically pressed then solution heat treated | Specified for pressure-critical or radiographically demanding castings; HIP closes internal shrinkage porosity and raises ductility, fatigue and toughness. | 255 | 545 | 45 | 149 HB | 2.4 % IACS |
HT-STABThis page solution treated then stabilize annealed (approx. 885–925 °C, air cool) | Choose for long-term 425–815 °C service or highly aggressive nitric/polythionic acid duty, where carbon is deliberately tied up as NbC before service. | 260 | 540 | 35 | 155 HB | 2.4 % IACS |
As fabricated | Use only for non-critical, non-corrosive, low-temperature parts; interdendritic carbides and casting stresses remain, so intergranular corrosion resistance is not guaranteed. | 265 | 520 | 30 | 160 HB | 2.4 % IACS |
Centrifugally cast, solution heat treated | Pick for high-temperature piping and tube shells: directional grain structure and dense wall give slightly higher strength than static castings. | 270 | 550 | 35 | 155 HB | 2.4 % IACS |
What is 1.4552 HT-STAB?
1.4552 HT-STAB is 1.4552 heat treated to HT-STAB — choose for long-term 425–815 °C service or highly aggressive nitric/polythionic acid duty, where carbon is deliberately tied up as NbC before service. 1.4552 HT-STAB has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 84% of stainless steel grades. Elongation at break is 35% and the elastic modulus is 193 GPa (28 Msi). 1.4552 HT-STAB has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 68% of stainless steel grades. It melts at 1,400°C (2,552 °F). HT is the default condition FabDigit quotes; HT-STAB is available on request or by drawing note.
Advantages
- Readily welded — 80/100, better than 80% of stainless steel grades
- High service temperature — 815°C (1,499 °F), better than 77% of stainless steel grades
- Low embodied carbon — 3.8 kg CO₂/kg, better than 77% of stainless steel grades
Limitations
- Hard to polish — 55/100, worse than 89% of stainless steel grades
- Low strength — 260 MPa (37.7 ksi), worse than 84% of stainless steel grades
- Limited formability — 22/100, worse than 82% of stainless steel grades
1.4552 HT-STAB properties
Typical room-temperature values for 1.4552 HT-STAB; 22 are specific to this condition. Other listed values are 1.4552 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4552 HT-STAB has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 68% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical16
1.4552 HT-STAB has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 84% of stainless steel grades. Elongation at break is 35% and the elastic modulus is 193 GPa (28 Msi).
Thermal6
1.4552 HT-STAB is rated for continuous service to 815°C (1,499 °F). It conducts heat at 16.2 W/m·K (9.36 BTU/hr·ft·°F), better than 64% of stainless steel grades. Thermal expansion is 16.9 µm/m·K (9.39 µin/in·°F).
Electrical3
1.4552 HT-STAB conducts electricity at 2.4 % IACS, better than 67% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (68/100), better than 63% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4552 HT-STAB takes about 55 MJ of energy and emits 3.8 kg of CO₂ — more than 50% of stainless steel grades. Typical recycled content is 80%.
Manufacturability8
1.4552 HT-STAB's machinability is poor (33/100, worse than 57% of stainless steel grades); weldability very good (80/100); formability poor (22/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4552 HT-STAB
Is 1.4552 easy to machine?
Work-hardens rapidly — use rigid setups, positive-rake carbide, heavy constant feed, low-to-moderate speed and flood coolant; avoid dwelling to prevent glazing.
Can 1.4552 be welded?
Very good with GTAW/SMAW using ER347/E347 (or 308L for low-temperature service); no post-weld solution anneal needed thanks to Nb stabilization, but limit heat input and keep interpass low to avoid hot cracking.
Can 1.4552 be formed, bent or molded?
Sand or investment cast with generous risering and 2–2.5% shrink allowance; feed hot spots well and control delta ferrite (FN 5–15) to reduce hot tearing.
What surface finishes work on 1.4552?
Pickle and passivate (ASTM A967) or electropolish after grinding to restore the chromium oxide film; shot blast with stainless media only — never carbon steel grit.
1.4552 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 |
|---|---|---|
| CEN 1.4552 limits C to 0.07 max | ≤ 0.08 | 0.05 |
| SiEN 10213: 1.5 max | ≤ 2 | 1.2 |
| Mn | ≤ 1.5 | 1 |
| P | ≤ 0.04 | 0.03 |
| SEN: 0.030 max | ≤ 0.04 | 0.02 |
| CrEN 1.4552: 18.0–20.0 | 18 – 21 | 19.5 |
| NiEN 1.4552: 9.0–11.0 | 9 – 12 | 10 |
| Moresidual | ≤ 0.5 | 0.2 |
| NbNb ≥ 8×C (A351); Nb+Ta permitted | 0.4 – 1 | 0.7 |
| Fe | balance | — |
1.4552 HT-STAB — frequently asked
What is 1.4552 HT-STAB used for?
1.4552 HT-STAB is typically used for high-temperature valve bodies, exhaust system castings and furnace hardware. In short: stabilized cast 347; 815 °C service temperature; no post-weld anneal needed.
What is the yield strength of 1.4552 HT-STAB?
1.4552 HT-STAB has a typical yield strength of 260 MPa (37.7 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 84% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is 1.4552 HT-STAB easy to machine?
Not especially — machinability is rated poor (33/100, worse than 57% of stainless steel grades). Work-hardens rapidly — use rigid setups, positive-rake carbide, heavy constant feed, low-to-moderate speed and flood coolant; avoid dwelling to prevent glazing.
Can 1.4552 HT-STAB be welded?
Yes — weldability is rated very good (80/100). Very good with GTAW/SMAW using ER347/E347 (or 308L for low-temperature service); no post-weld solution anneal needed thanks to Nb stabilization, but limit heat input and keep interpass low to avoid hot cracking.
What surface finishes work on 1.4552 HT-STAB?
Pickle and passivate (ASTM A967) or electropolish after grinding to restore the chromium oxide film; shot blast with stainless media only — never carbon steel grit.
Can 1.4552 HT-STAB be formed, bent or molded?
Sand or investment cast with generous risering and 2–2.5% shrink allowance; feed hot spots well and control delta ferrite (FN 5–15) to reduce hot tearing.
What is the maximum service temperature of 1.4552 HT-STAB?
1.4552 HT-STAB is rated for continuous use to about 815°C (1,499 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4552-HT and 1.4552-CF?
HT is the default condition — standard commercial supply condition: ≥1040 °C solution treat and rapid quench, giving fully dissolved matrix with maximum ductility and corrosion resistance. CF: pick for high-temperature piping and tube shells: directional grain structure and dense wall give slightly higher strength than static castings. Yield strength is 250 MPa in HT versus 270 MPa in CF.
Sources
- ASTM A351/A351M — Castings, Austenitic, for Pressure-Containing Parts (CF8C) — ASTM International (2022)
- EN 10213 — Steel castings for pressure purposes (GX5CrNiNb19-11, 1.4552) — CEN (2016)
- ASTM A451/A451M — Centrifugally Cast Austenitic Steel Pipe (CPF8C) — ASTM International (2021)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- Steel Castings Handbook, 6th ed. — Steel Founders' Society of America / ASM (1995)
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.