Steel A1011 SS Grade 50
ASTM A1011 SS Grade 50
A1011 SS Grade 50 is hot-rolled HSLA sheet and strip to ASTM A1011, the consolidated standard that replaced A570 and A607, supplied as SS 50 hot-rolled or pickled, HSLAS 50 Class 1 and Class 2, HSLAS-F 50 and cut-to-length coil.
Reference datasheet — A1011 SS Grade 50 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the SS50-HR condition
A1011 SS Grade 50 tempers and conditions
A1011 SS Grade 50 is supplied in 5 conditions, soft to hard. SS50-HR is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SS50-HRDefault SS Grade 50 | Default service-center stock: structural-quality hot-rolled sheet/coil for brackets, frames and weldments that will be painted. | 380 | 490 | 26 | 145 HB | 9 % IACS |
HSLAS Grade 50 Class 1 | Choose when 345 MPa yield is needed with maximum ductility/formability (lower minimum tensile than Class 2). | 380 | 460 | 26 | 140 HB | 9 % IACS |
HSLAS Grade 50 Class 2 | Use where a higher tensile-to-yield ratio (450 MPa min UTS) is specified, e.g. bolted structural and truck-frame parts. | 380 | 500 | 24 | 150 HB | 9 % IACS |
HSLAS-F Grade 50 | Best choice for tight roll-forming/stretch bends at 345 MPa yield: sulphide-shape-controlled, higher elongation and better bendability. | 380 | 460 | 28 | 140 HB | 9 % IACS |
SS/HSLAS Grade 50 | Order copper-bearing when mildly improved atmospheric corrosion resistance is wanted for exposed, painted or partly bare parts. | 385 | 495 | 25 | 148 HB | 8.5 % IACS |
Supply forms, finishes and certifications
Ways A1011 SS Grade 50 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
SS50-PO | SS Grade 50 | Surface finish |
What is A1011 SS Grade 50?
A1011 SS Grade 50 is hot-rolled HSLA sheet and strip to ASTM A1011, the consolidated standard that replaced A570 and A607, supplied as SS 50 hot-rolled or pickled, HSLAS 50 Class 1 and Class 2, HSLAS-F 50 and cut-to-length coil. Typical properties are 380 MPa yield, 490 MPa tensile, 26 % elongation and 145 HB (79 HRB), and it is one of the most commonly stocked structural sheet grades at US service centers. Weldability is excellent (score 85) but formability is only moderate (score 62) and the bare surface rusts quickly, so specify HSLAS-F 50 for tight bends and always coat for service. A1011 SS Grade 50 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). A1011 SS Grade 50 has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 490 MPa (71.1 ksi) — weaker than 68% of steel grades. Elongation at break is 26% and the elastic modulus is 205 GPa (29.7 Msi).
What is A1011 SS Grade 50 used for?
- structural stampings
- automotive brackets
- agricultural implements
Advantages
- Readily welded — 85/100, better than 83% of steel grades
- Ductile — tolerates forming and impact — 26%, better than 82% of steel grades
- Conducts heat well — 48 W/m·K (27.7 BTU/hr·ft·°F), better than 79% of steel grades
- Forms and bends easily — 62/100, better than 78% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
A1011 SS Grade 50 properties
Typical room-temperature values for A1011 SS Grade 50-SS50-HR; bars are the position among steel grades.
Physical3
A1011 SS Grade 50 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
A1011 SS Grade 50 has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 490 MPa (71.1 ksi) — weaker than 68% of steel grades. Elongation at break is 26% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
A1011 SS Grade 50 is rated for continuous service to 350°C (662 °F). It conducts heat at 48 W/m·K (27.7 BTU/hr·ft·°F), better than 79% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
A1011 SS Grade 50 conducts electricity at 9 % IACS, better than 71% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of A1011 SS Grade 50 takes about 25 MJ of energy and emits 2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 35%.
Manufacturability7
A1011 SS Grade 50's machinability is good (58/100, better than 75% of steel grades); weldability excellent (85/100); formability good (62/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the steel family
Yield strength against density for every steel grade FabDigit runs. A1011 SS Grade 50 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with A1011 SS Grade 50
Is A1011 SS Grade 50 easy to machine?
Machines like a C-Mn steel at ~58 % of 1212; sharp tools and rigid clamping stop thin-sheet chatter, and mill scale should be removed to protect edges.
Can A1011 SS Grade 50 be welded?
Excellent weldability by GMAW/GTAW/RSW/laser with ER70S-6 class filler; carbon equivalent is low enough that no preheat is normally needed below ~10 mm.
Can A1011 SS Grade 50 be formed, bent or molded?
Roll-forms and press-brake bends well but springback is higher than mild steel — allow larger bend radii (≈2t) and prefer HSLAS-F for tight bends.
A1011 SS 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 |
|---|---|---|
| CSS Gr 50 max 0.25; HSLAS Gr 50 max 0.23 | ≤ 0.25 | 0.12 |
| Mn | ≤ 1.35 | 0.85 |
| P0.04 max for HSLAS | ≤ 0.04 | 0.02 |
| Slower and shape-controlled for HSLAS-F | ≤ 0.04 | 0.01 |
| Sinot standard-limited for SS; typical mill value | ≤ 0.4 | 0.15 |
| Cuonly when copper-bearing steel is specified | ≥ 0.2 | 0.25 |
| NbHSLAS micro-alloying (Nb+V+Ti as agreed) | ≤ 0.1 | 0.03 |
| VHSLAS micro-alloying | ≤ 0.15 | 0.04 |
| TiHSLAS / HSLAS-F sulphide and grain control | ≤ 0.15 | 0.02 |
| Alkilled/deoxidized | ≤ 0.1 | 0.04 |
| Fe | balance |
What surface finishes work on A1011 SS Grade 50?
Not anodizable; specify pickled-and-oiled or blasted surface, then phosphate + e-coat, powder coat or hot-dip galvanize since the bare steel rusts quickly.
Surface treatments FabDigit runs on steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Organic Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Steel A1011 SS Grade 50 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- A1011 HSLAS Grade 50A1011-50A1011 SS Gr50
How much does A1011 SS Grade 50 cost?
A1011 SS Grade 50 is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
A1011 SS Grade 50 — frequently asked
What is A1011 SS Grade 50 used for?
A1011 SS Grade 50 is typically used for structural stampings, automotive brackets and agricultural implements. In short: widely stocked HSLA sheet; replaces A570 and A607; low-cost 50 ksi sheet.
What is the yield strength of A1011 SS Grade 50?
A1011 SS Grade 50 has a typical yield strength of 380 MPa (55.1 ksi) and a tensile strength of 490 MPa (71.1 ksi) — weaker than 68% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is A1011 SS Grade 50 easy to machine?
Reasonably — machinability is rated good (58/100, better than 75% of steel grades). Machines like a C-Mn steel at ~58 % of 1212; sharp tools and rigid clamping stop thin-sheet chatter, and mill scale should be removed to protect edges.
Can A1011 SS Grade 50 be welded?
Yes — weldability is rated excellent (85/100). Excellent weldability by GMAW/GTAW/RSW/laser with ER70S-6 class filler; carbon equivalent is low enough that no preheat is normally needed below ~10 mm.
What surface finishes work on A1011 SS Grade 50?
Not anodizable; specify pickled-and-oiled or blasted surface, then phosphate + e-coat, powder coat or hot-dip galvanize since the bare steel rusts quickly.
Can A1011 SS Grade 50 be formed, bent or molded?
Roll-forms and press-brake bends well but springback is higher than mild steel — allow larger bend radii (≈2t) and prefer HSLAS-F for tight bends.
What is the maximum service temperature of A1011 SS Grade 50?
A1011 SS Grade 50 is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between A1011 SS Grade 50 SS50-HR and A1011 SS Grade 50 SS50-CB?
SS50-HR is the default condition — default service-center stock: structural-quality hot-rolled sheet/coil for brackets, frames and weldments that will be painted. SS50-CB: order copper-bearing when mildly improved atmospheric corrosion resistance is wanted for exposed, painted or partly bare parts. Yield strength is 380 MPa in SS50-HR versus 385 MPa in SS50-CB.
How much does A1011 SS Grade 50 cost?
A1011 SS Grade 50 is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- ASTM A1011/A1011M — Standard Specification for Steel, Sheet and Strip, Hot-Rolled, Carbon, Structural, HSLA and UHSS — ASTM International (2018)
- ASTM A370 — Test Methods and Definitions for Mechanical Testing of Steel Products — ASTM International (2022)
- ASM Handbook Vol.1: Properties and Selection — Irons, Steels, and High-Performance Alloys (HSLA sheet steels) — ASM International (1990)
- ASM Handbook Vol.19: Fatigue and Fracture — ASM International (1996)
- Hot-rolled HSLA sheet and coil product data (A1011 SS/HSLAS grades) — Cleveland-Cliffs / Nucor (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.