Stainless Steel 1.4922 +QT800
Heat-treated state
EN 1.4922
+QT800 = quenched and tempered ~700–720 °C, Rm 800–950 MPa
Higher-strength condition for high-temperature bolting, flanges and valve stems where Rp0.2 ≥600 MPa is required.
Values for the +QT800 condition
Other 1.4922 tempers and conditions
1.4922 is listed in 6 conditions; see the grade overview at 1.4922.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Softest supply state for heavy machining, deep drilling or cold straightening before final hardening. | 430 | 720 | 20 | 17 HRC | — |
+QT700Default Quenched and tempered ~730–780 °C, Rm 690–840 MPa | Default delivery condition for boiler tubes, pipe, forgings and rotors operating with creep loading up to ~565 °C. | 560 | 760 | 18 | 22 HRC | — |
+QT800This page Quenched and tempered ~700–720 °C, Rm 800–950 MPa | Higher-strength condition for high-temperature bolting, flanges and valve stems where Rp0.2 ≥600 MPa is required. | 700 | 870 | 15 | 27 HRC | — |
Quenched and tempered ~650–690 °C, Rm 900–1050 MPa | Maximum practical strength for turbine blades and short-time-loaded parts; toughness and long-term creep stability are reduced. | 800 | 970 | 13 | 31 HRC | — |
Normalized | Intermediate mill condition for forgings/tubes; because of the high hardenability it is essentially air-hardened and must be tempered before service. | 950 | 1,300 | 8 | 43 HRC | 2.7 % IACS |
Hardened (austenitize 1020–1070 °C, oil/air quench), untempered | As-quenched state only — brittle and highly stressed; temper immediately, never use as delivered condition. | 1,100 | 1,450 | 6 | 46 HRC | 2.7 % IACS |
What is 1.4922 +QT800?
1.4922 +QT800 is 1.4922 heat treated to +QT800 — higher-strength condition for high-temperature bolting, flanges and valve stems where Rp0.2 ≥600 MPa is required. 1.4922 +QT800 has a yield strength of 700 MPa (102 ksi) and a tensile strength of 870 MPa (126 ksi) — stronger than 92% of stainless steel grades. Elongation at break is 15% and the elastic modulus is 216 GPa (31.3 Msi). 1.4922 +QT800 has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,425°C (2,597 °F). +QT700 is the default condition FabDigit quotes; +QT800 is available on request or by drawing note.
Advantages
- High strength — 700 MPa (102 ksi), better than 92% of stainless steel grades
- Low embodied carbon — 3.5 kg CO₂/kg, better than 88% of stainless steel grades
- High electrical conductivity — 2.9 % IACS, better than 87% of stainless steel grades
- Conducts heat well — 24.5 W/m·K (14.2 BTU/hr·ft·°F), better than 85% of stainless steel grades
Limitations
- Needs corrosion protection — 38/100, worse than 95% of stainless steel grades
- Limited ductility — 15%, worse than 89% of stainless steel grades
- Difficult to weld — 30/100, worse than 88% of stainless steel grades
- Hard to polish — 60/100, worse than 80% of stainless steel grades
- Limited formability — 25/100, worse than 78% of stainless steel grades
1.4922 +QT800 properties
Typical room-temperature values for 1.4922 +QT800; 12 are specific to this condition. Other listed values are 1.4922 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4922 +QT800 has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,425°C (2,597 °F).
Mechanical16
1.4922 +QT800 has a yield strength of 700 MPa (102 ksi) and a tensile strength of 870 MPa (126 ksi) — stronger than 92% of stainless steel grades. Elongation at break is 15% and the elastic modulus is 216 GPa (31.3 Msi).
Thermal6
1.4922 +QT800 is rated for continuous service to 550°C (1,022 °F). It conducts heat at 24.5 W/m·K (14.2 BTU/hr·ft·°F), better than 85% of stainless steel grades. Thermal expansion is 10.8 µm/m·K (6 µin/in·°F).
Electrical3
1.4922 +QT800 conducts electricity at 2.9 % IACS, better than 87% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (38/100), worse than 95% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4922 +QT800 takes about 50 MJ of energy and emits 3.5 kg of CO₂ — less than 80% of stainless steel grades. Typical recycled content is 45%.
Manufacturability6
1.4922 +QT800's machinability is poor (34/100, worse than 55% of stainless steel grades); weldability poor (30/100); formability poor (25/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4922 +QT800
Is 1.4922 easy to machine?
Machine in the annealed or +QT700 state with rigid setups, sharp carbide tooling, low-to-moderate speed and generous coolant; work-hardening and gummy chips above ~28 HRC.
Can 1.4922 be welded?
Weldable with matched 12Cr-Mo-V filler (or Ni-base for dissimilar joints) but requires 300–400 °C preheat/interpass, no cooling below Ms before PWHT, and 730–760 °C tempering to restore toughness.
Can 1.4922 be formed, bent or molded?
Hot form at 1100–850 °C followed by slow cool/anneal; cold forming is limited to gentle bends in the annealed condition.
What surface finishes work on 1.4922?
Takes a good ground/polished finish; passivation or light chrome/nitride treatment improves wet-service rust resistance, and shot peening is common on blade roots.
1.4922 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 | 0.17 – 0.23 | 0.2 |
| Si | 0.1 – 0.5 | 0.3 |
| Mn | 0.3 – 0.8 | 0.55 |
| P | ≤ 0.03 | — |
| S | ≤ 0.02 | — |
| Cr | 10 – 12.5 | 11.3 |
| Mo | 0.8 – 1.2 | 1 |
| Nicontrols delta ferrite / toughness | 0.3 – 0.8 | 0.55 |
| V | 0.25 – 0.35 | 0.3 |
| Fe | balance | — |
1.4922 +QT800 — frequently asked
What is 1.4922 +QT800 used for?
1.4922 +QT800 is typically used for steam turbine rotors and blades, high-temperature bolts, boiler components and power plant valves. In short: best-machining 12Cr creep steel; proven turbine rotor grade; service to 565 °C.
What is the yield strength of 1.4922 +QT800?
1.4922 +QT800 has a typical yield strength of 700 MPa (102 ksi) and a tensile strength of 870 MPa (126 ksi) — stronger than 92% of stainless steel grades. Strength varies by condition: see the 6 listed tempers.
Is 1.4922 +QT800 easy to machine?
Not especially — machinability is rated poor (34/100, worse than 55% of stainless steel grades). Machine in the annealed or +QT700 state with rigid setups, sharp carbide tooling, low-to-moderate speed and generous coolant; work-hardening and gummy chips above ~28 HRC.
Can 1.4922 +QT800 be welded?
Not readily — weldability is rated poor (30/100). Weldable with matched 12Cr-Mo-V filler (or Ni-base for dissimilar joints) but requires 300–400 °C preheat/interpass, no cooling below Ms before PWHT, and 730–760 °C tempering to restore toughness.
What surface finishes work on 1.4922 +QT800?
Takes a good ground/polished finish; passivation or light chrome/nitride treatment improves wet-service rust resistance, and shot peening is common on blade roots.
Can 1.4922 +QT800 be formed, bent or molded?
Hot form at 1100–850 °C followed by slow cool/anneal; cold forming is limited to gentle bends in the annealed condition.
What is the maximum service temperature of 1.4922 +QT800?
1.4922 +QT800 is rated for continuous use to about 550°C (1,022 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- DIN 17175 — Seamless tubes of heat-resistant steels (X20CrMoV12-1) — DIN (1979)
- EN 10302 — Creep resisting steels, nickel and cobalt alloys — CEN (2008)
- EN 10222-2 — Steel forgings for pressure purposes: ferritic and martensitic steels with specified elevated temperature properties — CEN (2021)
- GB/T 1221 — Heat-resisting steel bars (1Cr11MoV) — SAC (2007)
- 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)
- X20CrMoV11-1 (1.4922) heat-resisting steel data sheet — European special steel producer (2020)
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.