Steel A352 Grade LC1 Q+T
Heat-treated state
ASTM A352 Grade LC1 · UNS J12522
Q+T = quenched and tempered
Choose when heavier sections need uniform properties and higher, more reliable −59 °C impact energy; slightly higher strength and hardness.
Values for the Q+T condition
Other A352 Grade LC1 tempers and conditions
A352 Grade LC1 is listed in 2 conditions; see the grade overview at A352 Grade LC1.
- N+T
- Q+T
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
N+TDefault Normalized and tempered | Standard supply condition for A352 LC1 pressure castings; best balance of low-temperature toughness, weldability and cost. | 285 | 500 | 28 | 150 HB | — |
Q+TThis page Quenched and tempered | Choose when heavier sections need uniform properties and higher, more reliable −59 °C impact energy; slightly higher strength and hardness. | 330 | 540 | 27 | 165 HB | — |
What is A352 Grade LC1 Q+T?
A352 Grade LC1 Q+T is A352 Grade LC1 heat treated to Q+T — choose when heavier sections need uniform properties and higher, more reliable −59 °C impact energy; slightly higher strength and hardness. A352 Grade LC1 Q+T has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 78% of steel grades. Elongation at break is 27% and the elastic modulus is 200 GPa (29 Msi). A352 Grade LC1 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 — 130 MPa·√m (118.3 ksi·√in), better than 89% of steel grades
- Ductile — tolerates forming and impact — 27%, better than 86% of steel grades
- High service temperature — 450°C (842 °F), better than 86% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
- Low strength — 330 MPa (47.9 ksi), worse than 78% of steel grades
A352 Grade LC1 Q+T properties
Typical room-temperature values for A352 Grade LC1 Q+T; 12 are specific to this condition. Other listed values are A352 Grade LC1 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
A352 Grade LC1 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).
Mechanical16
A352 Grade LC1 Q+T has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 78% of steel grades. Elongation at break is 27% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
A352 Grade LC1 Q+T is rated for continuous service to 450°C (842 °F). It conducts heat at 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 56% of steel grades. Thermal expansion is 12.2 µm/m·K (6.78 µin/in·°F).
Electrical3
A352 Grade LC1 Q+T conducts electricity at 8.6 % IACS, better than 66% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of A352 Grade LC1 Q+T takes about 30 MJ of energy and emits 2.1 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 85%.
Manufacturability7
A352 Grade LC1 Q+T's machinability is good (55/100, better than 62% of steel grades); weldability good (68/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with A352 Grade LC1 Q+T
Is A352 Grade LC1 easy to machine?
Machines like normalized low-alloy carbon steel at ~60% of AISI 1212; use rigid setups and watch for hard spots or sand inclusions at the as-cast skin.
Can A352 Grade LC1 be welded?
Readily weldable with matching C-Mo (E/ER80S-D2, E7018-A1) consumables; preheat 95–150 °C for heavy sections and PWHT at 595–650 °C to restore −59 °C toughness after weld repair.
Can A352 Grade LC1 be formed, bent or molded?
Sand-cast grade with good fluidity and moderate shrinkage; risers and directional solidification needed to keep radiographic soundness in valve-body sections.
What surface finishes work on A352 Grade LC1?
No anodizing; shot blast then epoxy/zinc-rich paint, or electroless nickel/phosphate for corrosion protection—surface rusts quickly if left bare.
A352 Grade LC1 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 | ≤ 0.25 | 0.2 |
| Mn | 0.5 – 0.8 | 0.65 |
| Si | ≤ 0.6 | 0.4 |
| Mo | 0.45 – 0.65 | 0.55 |
| P | ≤ 0.04 | 0.02 |
| S | ≤ 0.05 | 0.02 |
| Curesidual element limit | ≤ 0.5 | — |
| Niresidual element limit | ≤ 0.5 | — |
| Crresidual element limit | ≤ 0.5 | — |
| Wresidual element limit | ≤ 0.1 | — |
| Vresidual element limit; total residuals 1.00 max | ≤ 0.03 | — |
| Fe | balance | — |
A352 Grade LC1 Q+T — frequently asked
What is A352 Grade LC1 Q+T used for?
A352 Grade LC1 Q+T is typically used for valve bodies, pump casings and low-temperature piping fittings. In short: low-temperature pressure casting; good weldability, rating 72; toughness to −46 °C (−50 °F).
What is the yield strength of A352 Grade LC1 Q+T?
A352 Grade LC1 Q+T has a typical yield strength of 330 MPa (47.9 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 78% of steel grades. Strength varies by condition: see the 2 listed tempers.
Is A352 Grade LC1 Q+T easy to machine?
Reasonably — machinability is rated good (55/100, better than 62% of steel grades). Machines like normalized low-alloy carbon steel at ~60% of AISI 1212; use rigid setups and watch for hard spots or sand inclusions at the as-cast skin.
Can A352 Grade LC1 Q+T be welded?
Yes — weldability is rated good (68/100). Readily weldable with matching C-Mo (E/ER80S-D2, E7018-A1) consumables; preheat 95–150 °C for heavy sections and PWHT at 595–650 °C to restore −59 °C toughness after weld repair.
What surface finishes work on A352 Grade LC1 Q+T?
No anodizing; shot blast then epoxy/zinc-rich paint, or electroless nickel/phosphate for corrosion protection—surface rusts quickly if left bare.
Can A352 Grade LC1 Q+T be formed, bent or molded?
Sand-cast grade with good fluidity and moderate shrinkage; risers and directional solidification needed to keep radiographic soundness in valve-body sections.
What is the maximum service temperature of A352 Grade LC1 Q+T?
A352 Grade LC1 Q+T 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.
Sources
- ASTM A352/A352M — Steel Castings, Ferritic and Martensitic, for Pressure-Containing Parts, Suitable for Low-Temperature Service — ASTM International (2023)
- ASME BPVC Section II Part D — Properties (Metric) — ASME (2023)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (Steel Castings) — ASM International (1990)
- Steel Castings Handbook, 6th ed. — Steel Founders' Society of America / ASM (1995)
- ASME B16.34 — Valves: Flanged, Threaded and Welding End (low-temperature material ratings) — ASME (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.