Steel WC11 N+T
Heat-treated state · default condition
GB WC11 · ASTM A217 Grade WC11
N+T = normalized and tempered
Standard supply condition for pressure-retaining valve and pipe castings; best balance of strength, toughness and creep stability.
Values for the N+T condition
Other WC11 tempers and conditions
WC11 is listed in 4 conditions; see the grade overview at WC11.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Interim softening condition for heavy machining or weld repair; must be re-normalized/tempered before pressure service. | 310 | 520 | 26 | 155 HB | 7.9 % IACS |
Spheroidize annealed | Not a delivery condition under A217 — shown only for foundry-stage reference; properties are non-uniform and unqualified. | 380 | 600 | 14 | 14 HRC | 7.7 % IACS |
N+TDefaultThis page Normalized and tempered | Standard supply condition for pressure-retaining valve and pipe castings; best balance of strength, toughness and creep stability. | 415 | 620 | 22 | 190 HB | — |
Quenched and tempered | Chosen for heavy-section castings needing uniform properties and higher toughness at the upper end of the strength band. | 470 | 670 | 21 | 205 HB | — |
What is WC11 N+T?
WC11 N+T is WC11 heat treated to N+T — standard supply condition for pressure-retaining valve and pipe castings; best balance of strength, toughness and creep stability. WC11 N+T has a yield strength of 415 MPa (60.2 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 56% of steel grades. Elongation at break is 22% and the elastic modulus is 205 GPa (29.7 Msi). WC11 N+T has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F).
Advantages
- High service temperature — 565°C (1,049 °F), better than 96% of steel grades
WC11 N+T properties
Typical room-temperature values for WC11 N+T; 11 are specific to this condition. Other listed values are WC11 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
WC11 N+T has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F).
Mechanical16
WC11 N+T has a yield strength of 415 MPa (60.2 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 56% of steel grades. Elongation at break is 22% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
WC11 N+T is rated for continuous service to 565°C (1,049 °F). It conducts heat at 40 W/m·K (23.1 BTU/hr·ft·°F), worse than 64% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
WC11 N+T conducts electricity at 7.8 % IACS, worse than 57% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (16/100), better than 79% of steel grades.
Sustainability4
Producing a kilogram of WC11 N+T takes about 26 MJ of energy and emits 2 kg of CO₂ — less than 64% of steel grades. Typical recycled content is 80%.
Manufacturability7
WC11 N+T's machinability is good (55/100, better than 62% of steel grades); weldability good (60/100); formability poor (25/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with WC11 N+T
Is WC11 easy to machine?
Machines like normalized 4130 — carbide tooling, moderate speeds, expect hard skin and sand inclusions on unmachined cast surfaces.
Can WC11 be welded?
P-No. 4 Cr-Mo: preheat 200–260 °C, low-hydrogen E8018-B2/ER80S-B2 consumables, and PWHT at 690–730 °C.
Can WC11 be formed, bent or molded?
Sand-cast with generous risering; normalize + temper after casting and after any weld repair to restore uniform properties.
What surface finishes work on WC11?
Shot-blast and paint or apply high-temperature aluminium/zinc-rich coating; no anodizing, and unprotected surfaces rust quickly.
WC11 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 | 0.15 – 0.21 | 0.18 |
| Mn | 0.5 – 0.8 | 0.65 |
| Sisilicon-modified relative to WC6 | 0.3 – 0.6 | 0.5 |
| Cr | 1 – 1.75 | 1.35 |
| Mo | 0.45 – 0.65 | 0.55 |
| P | ≤ 0.02 | — |
| S | ≤ 0.02 | — |
| Fe | balance | — |
WC11 N+T — frequently asked
What is WC11 N+T used for?
WC11 N+T is typically used for steam valve bodies, elevated-temperature pipe fittings, power plant pressure castings, bypass and control valve bodies, pump casings for superheated steam and flanged steam line elbows. In short: strongest WC-series casting; silicon-modified WC6; 565 °C steam service.
What is the yield strength of WC11 N+T?
WC11 N+T has a typical yield strength of 415 MPa (60.2 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 56% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is WC11 N+T easy to machine?
Reasonably — machinability is rated good (55/100, better than 62% of steel grades). Machines like normalized 4130 — carbide tooling, moderate speeds, expect hard skin and sand inclusions on unmachined cast surfaces.
Can WC11 N+T be welded?
Yes — weldability is rated good (60/100). P-No. 4 Cr-Mo: preheat 200–260 °C, low-hydrogen E8018-B2/ER80S-B2 consumables, and PWHT at 690–730 °C.
What surface finishes work on WC11 N+T?
Shot-blast and paint or apply high-temperature aluminium/zinc-rich coating; no anodizing, and unprotected surfaces rust quickly.
Can WC11 N+T be formed, bent or molded?
Sand-cast with generous risering; normalize + temper after casting and after any weld repair to restore uniform properties.
What is the maximum service temperature of WC11 N+T?
WC11 N+T is rated for continuous use to about 565°C (1,049 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between WC11 N+T and WC11-ANN?
N+T is the default condition — standard supply condition for pressure-retaining valve and pipe castings; best balance of strength, toughness and creep stability. ANN: interim softening condition for heavy machining or weld repair; must be re-normalized/tempered before pressure service. Yield strength is 415 MPa in N+T versus 310 MPa in ANN.
Sources
- ASTM A217/A217M — Steel Castings, Martensitic Stainless and Alloy, for Pressure-Containing Parts, Suitable for High-Temperature Service — ASTM International (2021)
- ASME BPVC Section II Part D — Material Properties (Metric) — ASME (2023)
- ASME B16.34 — Valves, Flanged, Threaded and Welding End — ASME (2020)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Steel Castings Handbook — Steel Founders' Society of America (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.