Steel A1018 HSLAS-F Grade 50 HRPO
Finish state
ASTM A1018 HSLAS-F Grade 50
HRPO = hot-rolled, pickled and oiled
Choose when scale-free surface is needed for direct stamping, welding, e-coat or paint without shot blasting.
Values for the HRPO condition
Other A1018 HSLAS-F Grade 50 tempers and conditions
A1018 HSLAS-F Grade 50 is listed in 2 conditions; see the grade overview at A1018 HSLAS-F Grade 50.
- HR
- HRPO
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
HRDefault Hot rolled | Standard mill condition for heavy-thickness HSLAS-F coil — pick when the part is blasted, pickled or painted downstream. | 380 | 470 | 28 | 145 HB | 8.6 % IACS |
HRPOThis page Hot-rolled, pickled and oiled | Choose when scale-free surface is needed for direct stamping, welding, e-coat or paint without shot blasting. | 380 | 470 | 29 | 143 HB | 8.6 % IACS |
What is A1018 HSLAS-F Grade 50 HRPO?
A1018 HSLAS-F Grade 50 HRPO is A1018 HSLAS-F Grade 50 supplied in the HRPO condition — choose when scale-free surface is needed for direct stamping, welding, e-coat or paint without shot blasting. A1018 HSLAS-F Grade 50 HRPO has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 68% of steel grades. Elongation at break is 29% and the elastic modulus is 205 GPa (29.7 Msi). A1018 HSLAS-F Grade 50 HRPO has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,460°C (2,660 °F). HR is the default condition FabDigit quotes; HRPO is available on request or by drawing note.
Advantages
- Ductile — tolerates forming and impact — 29%, better than 91% of steel grades
- Forms and bends easily — 72/100, better than 88% of steel grades
- Readily welded — 87/100, better than 85% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
A1018 HSLAS-F Grade 50 HRPO properties
Typical room-temperature values for A1018 HSLAS-F Grade 50 HRPO; 22 are specific to this condition. Other listed values are A1018 HSLAS-F Grade 50 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
A1018 HSLAS-F Grade 50 HRPO has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,460°C (2,660 °F).
Mechanical16
A1018 HSLAS-F Grade 50 HRPO has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 68% of steel grades. Elongation at break is 29% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
A1018 HSLAS-F Grade 50 HRPO is rated for continuous service to 400°C (752 °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).
Electrical3
A1018 HSLAS-F Grade 50 HRPO conducts electricity at 8.6 % IACS, better than 66% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (14/100), better than 70% of steel grades.
Sustainability4
Producing a kilogram of A1018 HSLAS-F Grade 50 HRPO takes about 24 MJ of energy and emits 2.1 kg of CO₂ — less than 97% of steel grades. Typical recycled content is 25%.
Manufacturability7
A1018 HSLAS-F Grade 50 HRPO's machinability is good (60/100, better than 83% of steel grades); weldability excellent (87/100); formability very good (72/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with A1018 HSLAS-F Grade 50 HRPO
Is A1018 HSLAS-F Grade 50 easy to machine?
Machines like a tough low-carbon steel — moderate speeds, sharp positive-rake tooling and good chip control to fight stringy chips; expect ~60 % of 1212 rates.
Can A1018 HSLAS-F Grade 50 be welded?
Excellent weldability (CE ≈ 0.30–0.38): GMAW/FCAW/RSW with 70-ksi-class filler; keep heat input moderate to avoid HAZ softening and loss of the micro-alloy strength.
Can A1018 HSLAS-F Grade 50 be formed, bent or molded?
Good roll forming and bending for its strength class — allow generous inside bend radii (≈1–2 t) and 6–10° extra springback versus mild steel; bend transverse to rolling direction when possible.
What surface finishes work on A1018 HSLAS-F Grade 50?
No inherent corrosion resistance: blast or pickle off scale, then phosphate + e-coat/paint, hot-dip or electro-galvanize; anodizing not applicable.
A1018 HSLAS-F Grade 50 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 |
|---|---|---|
| Cheat analysis maximum | ≤ 0.15 | 0.08 |
| Mn | ≤ 1.65 | 1.2 |
| Plow-P for improved formability | ≤ 0.02 | 0.01 |
| Ssulphide shape control / low S is the 'F' requirement | ≤ 0.02 | 0.01 |
| Si | ≤ 0.9 | 0.25 |
| Alaluminium killed | 0.01 – 0.1 | 0.04 |
| Cuwhen copper steel is specified | ≥ 0.2 | 0.25 |
| Nbmicro-alloy, Nb+V+Ti combination per producer practice | ≤ 0.1 | 0.03 |
| Vmicro-alloy | ≤ 0.15 | 0.04 |
| Timicro-alloy / sulphide shape control | ≤ 0.15 | 0.02 |
| N | ≤ 0.01 | 0.01 |
| Fe | balance | — |
A1018 HSLAS-F Grade 50 HRPO — frequently asked
What is A1018 HSLAS-F Grade 50 HRPO used for?
A1018 HSLAS-F Grade 50 HRPO is typically used for appliance panels, automotive body reinforcements and furniture stampings. In short: improved-formability HSLA sheet; 28 % elongation at 380 MPa; deep-stamping HSLA grade.
What is the yield strength of A1018 HSLAS-F Grade 50 HRPO?
A1018 HSLAS-F Grade 50 HRPO has a typical yield strength of 380 MPa (55.1 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 68% of steel grades. Strength varies by condition: see the 2 listed tempers.
Is A1018 HSLAS-F Grade 50 HRPO easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% of steel grades). Machines like a tough low-carbon steel — moderate speeds, sharp positive-rake tooling and good chip control to fight stringy chips; expect ~60 % of 1212 rates.
Can A1018 HSLAS-F Grade 50 HRPO be welded?
Yes — weldability is rated excellent (87/100). Excellent weldability (CE ≈ 0.30–0.38): GMAW/FCAW/RSW with 70-ksi-class filler; keep heat input moderate to avoid HAZ softening and loss of the micro-alloy strength.
What surface finishes work on A1018 HSLAS-F Grade 50 HRPO?
No inherent corrosion resistance: blast or pickle off scale, then phosphate + e-coat/paint, hot-dip or electro-galvanize; anodizing not applicable.
Can A1018 HSLAS-F Grade 50 HRPO be formed, bent or molded?
Good roll forming and bending for its strength class — allow generous inside bend radii (≈1–2 t) and 6–10° extra springback versus mild steel; bend transverse to rolling direction when possible.
What is the maximum service temperature of A1018 HSLAS-F Grade 50 HRPO?
A1018 HSLAS-F Grade 50 HRPO is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between A1018 HSLAS-F Grade 50-HR and A1018 HSLAS-F Grade 50 HRPO?
HR is the default condition — standard mill condition for heavy-thickness HSLAS-F coil — pick when the part is blasted, pickled or painted downstream. HRPO: choose when scale-free surface is needed for direct stamping, welding, e-coat or paint without shot blasting. Yield strength is 380 MPa in HR versus 380 MPa in HRPO.
Sources
- ASTM A1018/A1018M — Steel, Sheet and Strip, Heavy-Thickness Coils, Hot-Rolled, Carbon, Commercial, Drawing, Structural, HSLA and HSLA with Improved Formability — ASTM International (2023)
- ASTM A1011/A1011M (companion HSLAS-F grades) — ASTM International (2023)
- ASTM A370 — Mechanical Testing of Steel Products (hardness conversions) — ASTM International (2022)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.19 — Fatigue and Fracture — ASM International (1996)
- worldsteel LCI data for hot-rolled coil — World Steel Association (2023)
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.