Steel A352 Grade LCC Q+T
Heat-treated state
ASTM A352 Grade LCC · UNS J02505
Q+T = quenched and tempered
Chosen for heavy-section castings or when higher yield and more reliable −46 °C Charpy energy are required.
Values for the Q+T condition
Other A352 Grade LCC tempers and conditions
A352 Grade LCC is listed in 3 conditions; see the grade overview at A352 Grade LCC.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
N+T + post-weld heat treated / stress relieved after weld repair | Condition after weld repair or fabrication welding, stress-relieved below the tempering temperature to restore toughness and dimensional stability. | 305 | 510 | 26 | 148 HB | 9.6 % IACS |
N+TDefault Normalized and tempered | Standard supply condition for LCC valve and pump castings; best balance of toughness at −46 °C, cost and weldability. | 315 | 520 | 25 | 150 HB | — |
Q+TThis page Quenched and tempered | Chosen for heavy-section castings or when higher yield and more reliable −46 °C Charpy energy are required. | 380 | 560 | 24 | 170 HB | — |
What is A352 Grade LCC Q+T?
A352 Grade LCC Q+T is A352 Grade LCC heat treated to Q+T — chosen for heavy-section castings or when higher yield and more reliable −46 °C Charpy energy are required. A352 Grade LCC Q+T has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 68% of steel grades. Elongation at break is 24% and the elastic modulus is 202 GPa (29.3 Msi). A352 Grade LCC Q+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). N+T is the default condition FabDigit quotes; Q+T is available on request or by drawing note.
Advantages
- Tough — resists crack growth — 120 MPa·√m (109.2 ksi·√in), better than 81% of steel grades
- Readily welded — 74/100, better than 76% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
- Limited formability — 20/100, worse than 80% of steel grades
A352 Grade LCC Q+T properties
Typical room-temperature values for A352 Grade LCC Q+T; 12 are specific to this condition. Other listed values are A352 Grade LCC reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
A352 Grade LCC Q+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).
Mechanical15
A352 Grade LCC Q+T has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 68% of steel grades. Elongation at break is 24% and the elastic modulus is 202 GPa (29.3 Msi).
Thermal6
A352 Grade LCC Q+T is rated for continuous service to 425°C (797 °F). It conducts heat at 46 W/m·K (26.6 BTU/hr·ft·°F), better than 71% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical2
A352 Grade LCC Q+T has an electrical resistivity of 1.8×10⁻⁷ Ω·m.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of A352 Grade LCC Q+T takes about 26 MJ of energy and emits 2 kg of CO₂ — less than 64% of steel grades. Typical recycled content is 90%.
Manufacturability8
A352 Grade LCC Q+T's machinability is fair (54/100, better than 54% of steel grades); weldability very good (74/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with A352 Grade LCC Q+T
Is A352 Grade LCC easy to machine?
Machines like normalized 1025–1030 steel at ~60 % of AISI 1212; use rigid setups and expect scale/sand inclusions on the first cut of unmachined cast surfaces.
Can A352 Grade LCC be welded?
P-No.1 material — readily welded with E7018/ER70S-x, preheat 50–150 °C on heavy sections and stress relieve at 595–650 °C; weld repairs must be requalified for −46 °C Charpy.
Can A352 Grade LCC be formed, bent or molded?
Sand-cast in green sand or no-bake molds with generous risering (long freezing range, ~2 % solidification shrinkage); avoid abrupt section changes to limit hot tears and shrinkage porosity.
What surface finishes work on A352 Grade LCC?
No anodizing; specify shot blast plus epoxy/zinc-rich paint, hot-dip galvanizing, or electroless nickel/hardfaced seats for wetted valve surfaces.
A352 Grade LCC 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 |
|---|---|---|
| Cmax per ASTM A352 | ≤ 0.25 | 0.22 |
| Mn | ≤ 1.2 | 1.05 |
| Si | ≤ 0.6 | 0.45 |
| P | ≤ 0.04 | — |
| S | ≤ 0.05 | — |
| Curesidual element | ≤ 0.5 | — |
| Niresidual element | ≤ 0.5 | — |
| Crresidual element | ≤ 0.5 | — |
| Moresidual element | ≤ 0.2 | — |
| Vresidual element; total residuals ≤1.00 % | ≤ 0.03 | — |
| Fe | balance | — |
A352 Grade LCC Q+T — frequently asked
What is A352 Grade LCC Q+T used for?
A352 Grade LCC Q+T is typically used for valve bodies, pump casings and general low-temperature piping fittings. In short: lowest-cost A352 grade; best-welding cast pressure steel; baseline -46 °C casting.
What is the yield strength of A352 Grade LCC Q+T?
A352 Grade LCC Q+T has a typical yield strength of 380 MPa (55.1 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 68% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is A352 Grade LCC Q+T easy to machine?
Reasonably — machinability is rated fair (54/100, better than 54% of steel grades). Machines like normalized 1025–1030 steel at ~60 % of AISI 1212; use rigid setups and expect scale/sand inclusions on the first cut of unmachined cast surfaces.
Can A352 Grade LCC Q+T be welded?
Yes — weldability is rated very good (74/100). P-No.1 material — readily welded with E7018/ER70S-x, preheat 50–150 °C on heavy sections and stress relieve at 595–650 °C; weld repairs must be requalified for −46 °C Charpy.
What surface finishes work on A352 Grade LCC Q+T?
No anodizing; specify shot blast plus epoxy/zinc-rich paint, hot-dip galvanizing, or electroless nickel/hardfaced seats for wetted valve surfaces.
Can A352 Grade LCC Q+T be formed, bent or molded?
Sand-cast in green sand or no-bake molds with generous risering (long freezing range, ~2 % solidification shrinkage); avoid abrupt section changes to limit hot tears and shrinkage porosity.
What is the maximum service temperature of A352 Grade LCC Q+T?
A352 Grade LCC Q+T is rated for continuous use to about 425°C (797 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- ASTM A352/A352M — Steel Castings, Ferritic and Martensitic, for Pressure-Containing Parts, Suitable for Low-Temperature Service — ASTM International (2023)
- ASME B16.34 — Valves, Flanged, Threaded and Welding End (pressure–temperature ratings) — ASME (2020)
- ASME BPVC Section II Part D — Properties (Metric) — ASME (2023)
- ASM Handbook Vol.1: Properties and Selection — Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Steel Castings Handbook, 6th ed. — SFSA / ASM International (1995)
- 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.