Stainless Steel 1.6982-QT1
Heat-treated state · default condition
EN 1.6982 · UNS J91540 · ASTM A743/A487 Gr. CA6NM
QT1 = austenitised ~1000–1050 °C, air/oil quenched, tempered 600–620 °C
Standard supply condition: best balance of strength, ductility and low-temperature toughness for hydro runners, pump and valve bodies.
Values for the QT1 condition
Other 1.6982 tempers and conditions
1.6982 is listed in 5 conditions; see the grade overview at 1.6982.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed | Choose when heavy machining or sour-service hardness limits (NACE ≤23 HRC) dominate over strength. | 520 | 720 | 22 | 18 HRC | — |
QT1DefaultThis page Austenitised ~1000–1050 °C, air/oil quenched, tempered 600–620 °C | Standard supply condition: best balance of strength, ductility and low-temperature toughness for hydro runners, pump and valve bodies. | 640 | 830 | 19 | 24 HRC | — |
ASTM A743/A487 Gr. CA6NM normalize/quench + temper, 285 HB max | Order this when US/ASTM pressure-casting certification (A743, A487 Class A, A352 CA6NM low-temp) is required. | 650 | 830 | 20 | 25 HRC | 2.9 % IACS |
Quenched and tempered at lower temperature for higher strength | Pick when higher yield strength is needed (highly loaded runners, blades) and some toughness/sour-service margin can be traded away. | 720 | 920 | 16 | 30 HRC | — |
As fabricated | Raw casting before heat treatment — hard, low toughness, essentially never shipped for service. | 850 | 1,100 | 7 | 42 HRC | 2.8 % IACS |
What is 1.6982-QT1?
1.6982-QT1 is 1.6982 heat treated to QT1 — standard supply condition: best balance of strength, ductility and low-temperature toughness for hydro runners, pump and valve bodies. 1.6982-QT1 has a yield strength of 640 MPa (92.8 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 90% of stainless steel grades. Elongation at break is 19% and the elastic modulus is 200 GPa (29 Msi). 1.6982-QT1 has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,450°C (2,642 °F).
Advantages
- Low embodied carbon — 2.8 kg CO₂/kg, better than 99% of stainless steel grades
- Conducts heat well — 25 W/m·K (14.4 BTU/hr·ft·°F), better than 93% of stainless steel grades
- High strength — 640 MPa (92.8 ksi), better than 90% of stainless steel grades
- High electrical conductivity — 2.9 % IACS, better than 87% of stainless steel grades
Limitations
- Limited formability — 15/100, worse than 91% of stainless steel grades
- Limited ductility — 19%, worse than 81% of stainless steel grades
1.6982-QT1 properties
Typical room-temperature values for 1.6982-QT1; 15 are specific to this condition. Other listed values are 1.6982 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.6982-QT1 has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,450°C (2,642 °F).
Mechanical16
1.6982-QT1 has a yield strength of 640 MPa (92.8 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 90% of stainless steel grades. Elongation at break is 19% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
1.6982-QT1 is rated for continuous service to 450°C (842 °F). It conducts heat at 25 W/m·K (14.4 BTU/hr·ft·°F), better than 93% of stainless steel grades. Thermal expansion is 10.5 µm/m·K (5.83 µin/in·°F).
Electrical3
1.6982-QT1 conducts electricity at 2.9 % IACS, better than 87% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 71% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.6982-QT1 takes about 36 MJ of energy and emits 2.8 kg of CO₂ — less than 99% of stainless steel grades. Typical recycled content is 70%.
Manufacturability8
1.6982-QT1's machinability is fair (42/100, better than 79% of stainless steel grades); weldability very good (70/100); formability poor (15/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.6982-QT1
Is 1.6982 easy to machine?
Machine in the tempered condition with rigid setups, sharp positive-rake carbide and generous coolant; low carbon makes it gummy and work-hardening, so keep feed constant and avoid dwelling.
Can 1.6982 be welded?
Very weldable for a martensitic grade: use 410NiMo (E410NiMo/ER410NiMo) filler, 100–160 °C preheat/interpass, and post-weld temper at 580–620 °C below the original tempering temperature to restore HAZ toughness.
Can 1.6982 be formed, bent or molded?
Sand or investment cast with well-fed heavy sections; homogenise/austenitise 1000–1050 °C then air or oil quench, double temper — no cold forming of the finished part.
What surface finishes work on 1.6982?
Passivate or electropolish after machining; grind/polish for cavitation surfaces, and hard-chrome, stellite or HVOF overlays are used on wear/erosion zones — no anodizing.
1.6982 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 GX3CrNi13-4 ≤0.05; CA6NM ≤0.06 | ≤ 0.06 | 0.03 |
| Si | ≤ 1 | 0.5 |
| Mn | ≤ 1 | 0.7 |
| P | ≤ 0.04 | 0.02 |
| S | ≤ 0.03 | 0.01 |
| CrCA6NM allows 11.5–14.0 | 12 – 13.5 | 12.8 |
| NiCA6NM 3.5–4.5 | 3.5 – 5 | 4.2 |
| MoCA6NM 0.4–1.0 | 0.3 – 0.7 | 0.5 |
| Nkept low for toughness | ≤ 0.02 | 0.02 |
| Fe | balance | — |
1.6982-QT1 — frequently asked
What is 1.6982-QT1 used for?
1.6982-QT1 is typically used for hydraulic turbine runners, pump impellers and weld-repaired large castings. In short: most weldable martensitic casting; standard hydro turbine grade; ultra-low-carbon 13Cr-4Ni.
What is the yield strength of 1.6982-QT1?
1.6982-QT1 has a typical yield strength of 640 MPa (92.8 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 90% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is 1.6982-QT1 easy to machine?
Not especially — machinability is rated fair (42/100, better than 79% of stainless steel grades). Machine in the tempered condition with rigid setups, sharp positive-rake carbide and generous coolant; low carbon makes it gummy and work-hardening, so keep feed constant and avoid dwelling.
Can 1.6982-QT1 be welded?
Yes — weldability is rated very good (70/100). Very weldable for a martensitic grade: use 410NiMo (E410NiMo/ER410NiMo) filler, 100–160 °C preheat/interpass, and post-weld temper at 580–620 °C below the original tempering temperature to restore HAZ toughness.
What surface finishes work on 1.6982-QT1?
Passivate or electropolish after machining; grind/polish for cavitation surfaces, and hard-chrome, stellite or HVOF overlays are used on wear/erosion zones — no anodizing.
Can 1.6982-QT1 be formed, bent or molded?
Sand or investment cast with well-fed heavy sections; homogenise/austenitise 1000–1050 °C then air or oil quench, double temper — no cold forming of the finished part.
What is the maximum service temperature of 1.6982-QT1?
1.6982-QT1 is rated for continuous use to about 450°C (842 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.6982-QT1 and 1.6982-F?
QT1 is the default condition — standard supply condition: best balance of strength, ductility and low-temperature toughness for hydro runners, pump and valve bodies. F: raw casting before heat treatment — hard, low toughness, essentially never shipped for service. Yield strength is 640 MPa in QT1 versus 850 MPa in F.
Sources
- EN 10213 — Steel castings for pressure purposes (GX3CrNi13-4 / 1.6982) — CEN (2016)
- ASTM A743/A743M — Castings, Iron-Chromium-Nickel, Corrosion Resistant (CA6NM) — ASTM (2021)
- ASTM A487/A487M — Steel Castings for Pressure-Containing Parts (CA6NM Class A) — ASTM (2020)
- ASTM A352/A352M — Ferritic and Martensitic Steel Castings for Low-Temperature Service — ASTM (2018)
- 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)
- GB/T 6967 / GB/T 2100 — ZG06Cr13Ni4Mo — SAC (2009)
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.