Steel A653 HSLAS50-1

Grade

ASTM A653

HSLAS50-1 = hSLAS Grade 50 [340] Class 1

Most common HSLA galvanized grade for chassis brackets, cross-members and heavy studs.

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Values for the HSLAS50-1 condition

Other A653 tempers and conditions

A653 is listed in 37 conditions; see the grade overview at A653.

Compare all 37 conditionsHide

Condition · open for datasheet	Best for	Yield MPa	Tensile MPa	Elong. %	Hardness	Conductivity
EDDS Extra Deep Drawing Steel	Highest-formability galvanized sheet for severe draws and visible automotive/appliance panels.	160	285	46	78 HB	12.5 % IACS
DDS-C DDS Type C	Non-aging deep-draw grade for parts stored before forming or drawn long after coating.	180	295	43	82 HB	12 % IACS
DDS-A DDS Type A	For deep-drawn parts (sinks, housings) needing high n and r values.	190	300	42	85 HB	11.5 % IACS
FS-A FS Type A	Pick for moderate stamping/bending where CS ductility is marginal.	210	310	40	90 HB	11 % IACS
CS-A CS Type A	Use when a tighter carbon/phosphorus limit is wanted for slightly better bending than Type B.	220	320	38	95 HB	11 % IACS
FS-B FS Type B	Use when press springback repeatability needs a bounded yield strength window.	220	315	40	92 HB	11 % IACS
CR Cold rolled	Standard route for 0.3–2.0 mm sheet needing good surface for paint/powder coat.	230	330	38	100 HB	10.5 % IACS
CS-B CS Type B	Default general-purpose galvanized sheet: bending, roll forming, mild drawing, ductwork and enclosures.	230	330	37	100 HB	10.5 % IACS
A60 zinc-iron alloy (galvannealed) coating, 180 g/m² total	Galvannealed matte surface for best paint adhesion and weldability; less sacrificial reserve than G90.	235	330	36	100 HB	10.5 % IACS
CS-C CS Type C	Economy commercial grade where rephosphorized scrap chemistry is acceptable and forming demands are low.	250	345	34	105 HB	10 % IACS
HRDefault Hot rolled	Cheapest route for thicker gauge galvanized coil/sheet where surface appearance is secondary.	260	360	32	110 HB	10.5 % IACS
SS33 SS Grade 33 [230]	Lightest structural grade for light-gauge framing, decking and roll-formed sections.	260	340	26	103 HB	10.5 % IACS
SS37 SS Grade 37 [255]	Intermediate structural grade when Grade 33 is not stiff enough but full formability is still needed.	285	380	24	112 HB	10.5 % IACS
SS40 SS Grade 40 [275]	Common decking / purlin grade balancing strength and roll-forming behaviour.	305	400	22	118 HB	10.3 % IACS
HSLAS45-1 HSLAS Grade 45 [310] Class 1	Microalloyed 45 ksi grade for stronger formed parts than SS40 at similar ductility.	345	470	25	135 HB	9.5 % IACS
HSLAS45-2 HSLAS Grade 45 [310] Class 2	Class 2 trades tensile strength for extra elongation and better bend/stretch behaviour.	345	440	27	128 HB	9.5 % IACS
SS50-1 SS Grade 50 [340] Class 1	Standard 50 ksi structural galvanized sheet for studs, track and deck.	375	480	18	140 HB	10 % IACS
SS50-3 SS Grade 50 [340] Class 3	Lower tensile-to-yield ratio version of Grade 50 for easier forming of framing members.	375	450	18	132 HB	10 % IACS
SS50-4 SS Grade 50 [340] Class 4	Class 4 is specified when both yield and tensile need to sit in a narrow band for cold-formed design.	375	455	18	134 HB	10 % IACS
HSLAS50-1This page HSLAS Grade 50 [340] Class 1	Most common HSLA galvanized grade for chassis brackets, cross-members and heavy studs.	375	500	23	145 HB	9.3 % IACS
HSLAS50-2 HSLAS Grade 50 [340] Class 2	Choose when 50 ksi yield must coexist with stretch-flanging.	375	450	26	131 HB	9.3 % IACS
HSLAS-F50 HSLAS-F Grade 50 [340]	Ti/Nb-treated, low-inclusion HSLA for stretch-flanged automotive parts at 340 MPa yield.	375	450	25	135 HB	9.8 % IACS
SS55 SS Grade 55 [380]	Higher-strength structural sheet where section depth is limited.	415	510	16	150 HB	9.8 % IACS
HSLAS55-1 HSLAS Grade 55 [380] Class 1	55 ksi microalloyed grade for moderately formed high-load parts.	415	520	20	152 HB	9.2 % IACS
HSLAS55-2 HSLAS Grade 55 [380] Class 2	Higher-ductility class of the 55 ksi HSLA grade.	415	490	24	143 HB	9.2 % IACS
SS60 SS Grade 60 [410]	Strength-driven roll-formed profiles with simple, generous bend radii.	450	520	12	155 HB	9.8 % IACS
HSLAS60-1 HSLAS Grade 60 [410] Class 1	60 ksi HSLA sheet for weight-reduced structural stampings.	450	550	18	160 HB	9.5 % IACS
HSLAS60-2 HSLAS Grade 60 [410] Class 2	Class 2 60 ksi grade when bends and flanges are tight.	450	500	22	150 HB	9.5 % IACS
HSLAS-F60 HSLAS-F Grade 60 [410]	410 MPa yield with hole-expansion capability for chassis stampings.	450	510	22	152 HB	9.5 % IACS
HSLAS65-1 HSLAS Grade 65 [450] Class 1	65 ksi microalloyed galvanized sheet for high-strength brackets.	490	580	16	170 HB	9.3 % IACS
HSLAS65-2 HSLAS Grade 65 [450] Class 2	Formability-improved class of the 65 ksi HSLA grade.	490	550	19	162 HB	9.3 % IACS
SS70 SS Grade 70 [480]	High-yield structural galvanized sheet for lightweight deck and framing; limited bending.	520	590	9	170 HB	10 % IACS
HSLAS70-1 HSLAS Grade 70 [480] Class 1	Top HSLAS strength level; use only for simple forms with generous radii.	520	620	15	183 HB	9 % IACS
HSLAS70-2 HSLAS Grade 70 [480] Class 2	70 ksi HSLA with relaxed tensile ceiling for better bending.	520	580	17	172 HB	9 % IACS
HSLAS-F70 HSLAS-F Grade 70 [480]	480 MPa yield HSLA-F for lightweighted structural parts with flanges.	520	580	19	175 HB	8.5 % IACS
SS80 SS Grade 80 [550]	Full-hard, low-ductility grade for corrugated roofing/siding and deck where only simple corrugations are formed.	590	600	3	180 HB	10.5 % IACS
HSLAS-F80 HSLAS-F Grade 80 [550]	Highest HSLAS-F level; ductile alternative to full-hard SS80 where forming is required.	590	650	17	195 HB	8 % IACS

What is A653 HSLAS50-1?

A653 HSLAS50-1 is A653 in the HSLAS50-1 grade — most common HSLA galvanized grade for chassis brackets, cross-members and heavy studs. A653 HSLAS50-1 has a yield strength of 375 MPa (54.4 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 70% of steel grades. Elongation at break is 23% and the elastic modulus is 200 GPa (29 Msi). A653 HSLAS50-1 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,495°C (2,723 °F). HR is the default condition FabDigit quotes; HSLAS50-1 is available on request or by drawing note.

Advantages

Good corrosion resistance — 38/100, better than 97% of steel grades
Forms and bends easily — 66/100, better than 83% of steel grades

Limitations

Hard to polish — 25/100, worse than 100% of steel grades
Limited service temperature — 200°C (392 °F), worse than 93% of steel grades
High embodied carbon — 2.5 kg CO₂/kg, worse than 82% of steel grades

A653 HSLAS50-1 properties

Typical room-temperature values for A653 HSLAS50-1; 20 are specific to this condition. Other listed values are A653 reference data and may not represent this condition. Bars are the position among steel grades.

Physical3

A653 HSLAS50-1 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,495°C (2,723 °F).

Density7.85 g/cm³0.28 lb/in³

Melting Point (Solidus)1,495°C2,723 °F

Liquidus Temperature1,520°C2,768 °F

Mechanical15

A653 HSLAS50-1 has a yield strength of 375 MPa (54.4 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 70% of steel grades. Elongation at break is 23% and the elastic modulus is 200 GPa (29 Msi).

Elastic (Young's) Modulus200 GPa29 Msi

Shear Modulus79 GPa11.5 Msi

Bulk Modulus160 GPa23.2 Msi

Poisson's Ratio0.29

Tensile Strength (Ultimate)500 MPa72.5 ksi

Yield Strength (0.2% offset)375 MPa54.4 ksi

Elongation at Break23%

Reduction in Area55%

Compressive Strength375 MPa54.4 ksi

Shear Strength330 MPa47.9 ksi

Fatigue Strength (Endurance Limit)225 MPa32.6 ksi

Charpy V-Notch Impact (RT)35 J25.8 ft·lbf

Hardness, Brinell145 HB

Hardness, Rockwell B78 HRB

Hardness, Vickers152 HV

Thermal6

A653 HSLAS50-1 is rated for continuous service to 200°C (392 °F). It conducts heat at 47 W/m·K (27.2 BTU/hr·ft·°F), better than 75% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).

Thermal Conductivity47 W/m·K27.2 BTU/hr·ft·°F

Specific Heat Capacity470 J/kg·K0.11 BTU/lb·°F

Thermal Expansion (CTE, 20–100 °C)12 µm/m·K6.7 µin/in·°F

Latent Heat of Fusion270 J/g116 BTU/lb

Max Service Temperature (continuous)200°C392 °F

Min Service Temperature-30°C-22 °F

Electrical3

A653 HSLAS50-1 conducts electricity at 9.3 % IACS, better than 73% of steel grades.

Electrical Conductivity9.3 % IACS

Electrical Resistivity1.85×10⁻⁷ Ω·m7.28 µΩ·in

Magnetic Responseferromagnetic

Chemical & Environmental3

Corrosion resistance is fair (38/100), better than 97% of steel grades.

Galvanic Potential (seawater, vs SCE)-1.02 V

Corrosion ResistanceFair38/100

Chemical Resistance SummaryGood in neutral atmospheric and dry indoor service; zinc gives sacrificial protection at cut edges and scratches. Attacked by acids (pH<6) and strong alkalis (pH>12), by chlorides/de-icing salt in wet-dry cycling, and by damp storage (white rust). Not for immersion or acidic condensate.

Sustainability4

Producing a kilogram of A653 HSLAS50-1 takes about 30 MJ of energy and emits 2.5 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 30%.

Embodied Energy (primary production)30 MJ/kg12,898 BTU/lb

Embodied Carbon (primary production)2.5 kg CO₂/kg

Embodied Water60 L/kg7.2 gal/lb

Typical Recycled Content30%

Manufacturability7

A653 HSLAS50-1's machinability is good (58/100, better than 75% of steel grades); weldability good (68/100); formability good (66/100).

MachinabilityGood58/100

Machinability Rating (AISI 1212 = 100 %)63%

WeldabilityGood68/100

Formability (cold)Good66/100

Brazeability / SolderabilityVery good70/100

PolishabilityPoor25/100

Anodizing Responsen/a — ferrous coated sheet; use passivation/chromate-free sealer, phosphate + powder coat or paint over zinc

Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.

Working with A653 HSLAS50-1

Is A653 easy to machine?

Shear, punch and laser/plasma cut readily; use sharp tooling and lubricant to avoid galling of the soft zinc, and re-protect cut edges (zinc-rich paint) since bare edges rely on sacrificial throw.

Can A653 be welded?

Resistance spot and MIG/brazing are standard but zinc vaporizes — extract fumes, expect porosity/spatter, increase current and electrode dressing, or specify galvannealed (A-series) for better weldability.

Can A653 be formed, bent or molded?

Excellent cold roll-forming, bending and drawing in CS/FS/DDS/EDDS; SS Grade 80 full-hard tolerates only simple corrugations, and HSLAS needs larger bend radii and springback compensation.

What surface finishes work on A653?

Do not anodize; phosphate or use a wash primer/chromate-free passivation before powder coat or paint. Skin-passed and chemically treated (passivated/oiled) coils are best for painting; galvannealed gives the best paint adhesion.

A653 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
CCS Type B limit; SS/HSLAS allow up to 0.20–0.25 %	0.02 – 0.15	0.06
Mnup to 1.35 % for SS, 1.65 % for HSLAS	≤ 0.6	0.3
PCS Type C and SS allow up to 0.10 %	≤ 0.02	0.01
S	≤ 0.04	0.01
Alaluminum-killed base metal	0.02 – 0.08	0.04
Cu0.20 min if copper-bearing specified	≤ 0.2	0.03
Niresidual	≤ 0.2	0.02
Crresidual	≤ 0.15	0.03
Moresidual	≤ 0.06	0.01
NbHSLAS/HSLAS-F microalloying (Nb+V+Ti)	≤ 0.08	0.03
VHSLAS microalloying	≤ 0.1	0.02
TiHSLAS-F / IF (EDDS) stabilization	≤ 0.15	0.03
N	≤ 0.01	0.01
Zn (coating)hot-dip coating, not base chemistry: G60 = 180 g/m², G90 = 275 g/m², G115 = 350 g/m² total both sides; ZF/A-series is Zn–Fe alloy (~10 % Fe)	—	—
Fe	balance	—

A653 HSLAS50-1 — frequently asked

What is A653 HSLAS50-1 used for?

A653 HSLAS50-1 is typically used for light-gauge steel framing studs and track, HVAC ductwork, roof decking, industrial siding and wall panels, cable tray and electrical enclosures and appliance housings. In short: galvanized commercial-quality coil.

What is the yield strength of A653 HSLAS50-1?

A653 HSLAS50-1 has a typical yield strength of 375 MPa (54.4 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 70% of steel grades. Strength varies by condition: see the 37 listed tempers.

Is A653 HSLAS50-1 easy to machine?

Reasonably — machinability is rated good (58/100, better than 75% of steel grades). Shear, punch and laser/plasma cut readily; use sharp tooling and lubricant to avoid galling of the soft zinc, and re-protect cut edges (zinc-rich paint) since bare edges rely on sacrificial throw.

Can A653 HSLAS50-1 be welded?

Yes — weldability is rated good (68/100). Resistance spot and MIG/brazing are standard but zinc vaporizes — extract fumes, expect porosity/spatter, increase current and electrode dressing, or specify galvannealed (A-series) for better weldability.

What surface finishes work on A653 HSLAS50-1?

Can A653 HSLAS50-1 be formed, bent or molded?

Excellent cold roll-forming, bending and drawing in CS/FS/DDS/EDDS; SS Grade 80 full-hard tolerates only simple corrugations, and HSLAS needs larger bend radii and springback compensation.

What is the maximum service temperature of A653 HSLAS50-1?

A653 HSLAS50-1 is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.

What is the difference between A653-HR and A653-SS80?

HR is the default condition — cheapest route for thicker gauge galvanized coil/sheet where surface appearance is secondary. SS80: full-hard, low-ductility grade for corrugated roofing/siding and deck where only simple corrugations are formed. Yield strength is 260 MPa in HR versus 590 MPa in SS80.

Can FabDigit make parts in A653 HSLAS50-1?

Yes — A653 HSLAS50-1 is available for sheet metal with instant online pricing. Upload a STEP file to get a price and a DFM check.

Sources

ASTM A653/A653M — Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process — ASTM International (2023)
ASTM A924/A924M — General Requirements for Steel Sheet, Metallic-Coated by the Hot-Dip Process — ASTM International (2022)
ASM Handbook Vol. 1: Properties and Selection — Irons, Steels, and High-Performance Alloys — ASM International (1990)
Cold-Formed Steel Design Manual / AISI S100 Commentary — American Iron and Steel Institute (2020)
Hot-dip galvanized and galvannealed sheet product data (CS/FS/DDS/SS/HSLAS grades) — Cleveland-Cliffs / Nucor / Baosteel (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.