Steel A1008 SS-45
Grade
ASTM A1008 · JIS SPCC
SS-45 = sS Grade 45 [310]
Higher-strength structural sheet where weight saving matters more than draw depth.
Values for the SS-45 condition
Other A1008 tempers and conditions
A1008 is listed in 31 conditions; see the grade overview at A1008.
- EDDS
- DDS
- DS-B
- DS-A
- SS-25
- BHS-180
- CS-C
- BHS-210
- CS-B
- SS-30
- CS-A
- SS-33
- BHS-240
- SS-40
- BHS-280
- SS-45
- HSLAS-45
- SS-50
- HSLAS-50
- HSLAS-F-50
- HSLAS-55
- HSLAS-60
- HSLAS-F-60
- SS-60
- HSLAS-65
- HSLAS-70
- HSLAS-F-70
- SS-70
- HSLAS-F-80
- SS-80
- UHSS
Compare all 31 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Extra deep drawing steel | IF steel for the most severe automotive/appliance draws; highest r-value and no aging. | 160 | 290 | 45 | 78 HB | 12 % IACS |
Deep drawing steel | Deep cups, appliance shells and severe draws where DS still splits. | 180 | 300 | 42 | 82 HB | 11.5 % IACS |
DS Type B | Drawing quality with non-aging behaviour — use when coils are stored before stamping. | 195 | 305 | 41 | 86 HB | 11.2 % IACS |
DS Type A | For parts that fail in CS because of moderate draws or tight radii. | 200 | 310 | 40 | 88 HB | 11 % IACS |
SS Grade 25 [170] | Lightly loaded structural sheet where a guaranteed minimum yield is required. | 200 | 320 | 30 | 98 HB | 10.8 % IACS |
BHS Grade 180 [26] | Soft for stamping, then gains ~30–40 MPa yield during paint bake — outer body panels. | 200 | 310 | 34 | 88 HB | 10.8 % IACS |
CS Type C | Choose when a slightly softer, cleaner-surface commercial sheet is needed for painting or light drawing. | 230 | 320 | 39 | 92 HB | 11 % IACS |
BHS Grade 210 [30] | Dent-resistance upgrade for skin panels with the same tooling as DDS. | 230 | 335 | 32 | 95 HB | 10.6 % IACS |
CS-BDefault CS Type B | The default stocked cold-rolled commercial sheet — best balance of price, weldability and moderate drawing. | 240 | 330 | 38 | 95 HB | 10.8 % IACS |
SS Grade 30 [205] | Entry structural grade for brackets and frames with modest forming. | 240 | 340 | 28 | 102 HB | 10.8 % IACS |
CS Type A | General sheet-metal work with mild bending/forming; standard carbon-killed commercial quality. | 250 | 340 | 36 | 98 HB | 10.8 % IACS |
SS Grade 33 [230] | Common light-structural grade; Type 2 has tighter chemistry limits for welding. | 265 | 360 | 26 | 107 HB | 10.8 % IACS |
BHS Grade 240 [35] | Higher-strength bake-hardenable panel steel for thinner gauges. | 265 | 365 | 30 | 105 HB | 10.4 % IACS |
SS Grade 40 [275] | Mid-strength structural sheet for shelving, panels and light framing. | 305 | 390 | 24 | 116 HB | 10.8 % IACS |
BHS Grade 280 [40] | Top bake-hardenable grade — max dent resistance after paint bake. | 305 | 400 | 28 | 115 HB | 10.2 % IACS |
SS-45This page SS Grade 45 [310] | Higher-strength structural sheet where weight saving matters more than draw depth. | 340 | 415 | 20 | 125 HB | 10.8 % IACS |
HSLAS Grade 45 [310] Class 1/2 | Nb/Ti/V microalloyed sheet giving SS-45 strength with much better bending and toughness; Class 2 trades tensile for formability. | 345 | 450 | 24 | 130 HB | 9.5 % IACS |
SS Grade 50 [340] | Strength-driven roll-formed sections and load-bearing panels. | 375 | 450 | 17 | 137 HB | 10.8 % IACS |
HSLAS Grade 50 [340] Class 1/2 | Most common HSLA cold-rolled grade for automotive brackets and reinforcements. | 375 | 480 | 22 | 140 HB | 9.5 % IACS |
HSLAS-F Grade 50 [340] | Sulphide-shape-controlled HSLA for deep-drawn high-strength parts. | 375 | 460 | 26 | 135 HB | 9.5 % IACS |
HSLAS Grade 55 [380] Class 1/2 | Step-up strength for weight reduction while keeping ~18–20 % elongation. | 415 | 510 | 19 | 150 HB | 9.3 % IACS |
HSLAS Grade 60 [410] Class 1/2 | High-strength stampings where SS-60 would crack at the bend radii. | 445 | 545 | 17 | 160 HB | 9.3 % IACS |
HSLAS-F Grade 60 [410] | 410 MPa yield with drawing-grade bendability for complex stampings. | 445 | 520 | 23 | 155 HB | 9.3 % IACS |
SS Grade 60 [410] | Cold-work-strengthened structural sheet for simple bends only. | 450 | 510 | 10 | 155 HB | 10.5 % IACS |
HSLAS Grade 65 [450] Class 1/2 | Structural reinforcements needing 450 MPa yield with usable ductility. | 485 | 580 | 15 | 172 HB | 9.2 % IACS |
HSLAS Grade 70 [480] Class 1/2 | Top conventional HSLA grade in A1008 — maximum strength before HSLAS-F/UHSS. | 515 | 620 | 13 | 185 HB | 9.2 % IACS |
HSLAS-F Grade 70 [480] | 480 MPa yield stampings with tight radii and good hole expansion. | 515 | 590 | 20 | 9 HRC | 9.5 % IACS |
SS Grade 70 [480] | High-strength flat or lightly formed parts, typically temper-rolled to strength. | 520 | 560 | 6 | 170 HB | 10.5 % IACS |
HSLAS-F Grade 80 [550] | Highest HSLAS-F grade; chassis and seat structures needing 550 MPa yield plus formability. | 590 | 660 | 18 | 14 HRC | 9.3 % IACS |
SS Grade 80 [550] | Full-hard sheet for flat, high-strength, essentially non-formed applications (e.g. deck, strapping). | 610 | 640 | 2 | 195 HB | 10.5 % IACS |
Ultra-high-strength (martensitic) cold-rolled sheet | Quenched martensitic sheet for intrusion beams, bumpers and roll-formed profiles; essentially no drawability and needs careful welding. | 900 | 1,100 | 5 | 38 HRC | — |
What is A1008 SS-45?
A1008 SS-45 is A1008 in the SS-45 grade — higher-strength structural sheet where weight saving matters more than draw depth. A1008 SS-45 has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 415 MPa (60.2 ksi) — weaker than 76% of steel grades. Elongation at break is 20% and the elastic modulus is 200 GPa (29 Msi). A1008 SS-45 has a density of 7.87 g/cm³ (0.284 lb/in³), heavier than 92% of steel grades. It melts at 1,495°C (2,723 °F). CS-B is the default condition FabDigit quotes; SS-45 is available on request or by drawing note.
Advantages
- High electrical conductivity — 10.8 % IACS, better than 94% of steel grades
- Conducts heat well — 51 W/m·K (29.5 BTU/hr·ft·°F), better than 92% of steel grades
- Readily welded — 90/100, better than 90% of steel grades
- Forms and bends easily — 65/100, better than 81% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
- Low strength — 340 MPa (49.3 ksi), worse than 76% of steel grades
A1008 SS-45 properties
Typical room-temperature values for A1008 SS-45; 22 are specific to this condition. Other listed values are A1008 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
A1008 SS-45 has a density of 7.87 g/cm³ (0.284 lb/in³), heavier than 92% of steel grades. It melts at 1,495°C (2,723 °F).
Mechanical16
A1008 SS-45 has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 415 MPa (60.2 ksi) — weaker than 76% of steel grades. Elongation at break is 20% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
A1008 SS-45 is rated for continuous service to 400°C (752 °F). It conducts heat at 51 W/m·K (29.5 BTU/hr·ft·°F), better than 92% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
A1008 SS-45 conducts electricity at 10.8 % IACS, better than 94% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (10/100), worse than 86% of steel grades.
Sustainability4
Producing a kilogram of A1008 SS-45 takes about 27 MJ of energy and emits 2.3 kg of CO₂ — less than 59% of steel grades. Typical recycled content is 25%.
Manufacturability7
A1008 SS-45's machinability is good (57/100, better than 71% of steel grades); weldability excellent (90/100); formability good (65/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with A1008 SS-45
Is A1008 easy to machine?
Soft and gummy — sharp tools, positive rake and good chip evacuation; blanking, laser and punching are the normal 'machining' routes for this thin sheet.
Can A1008 be welded?
Excellent for RSW, MIG, TIG and laser with ER70S-x filler; no preheat or PWHT needed on CS/DS/DDS, but UHSS and high HSLAS grades need controlled heat input to limit HAZ softening.
Can A1008 be formed, bent or molded?
Cold forming is the primary process — pick CS for bends, DS/DDS/EDDS as draw severity rises; watch stretcher strains/aging in non-killed CS and allow for springback in SS/HSLAS grades.
What surface finishes work on A1008?
Bare sheet must be protected: zinc/zinc-nickel plating, hot-dip galvanizing, zinc phosphate + e-coat, powder coat or oiling; it takes paint well after alkaline clean and phosphate.
A1008 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; DDS/EDDS much lower (≤0.02 C, IF steels ≤0.01) | 0.02 – 0.15 | 0.06 |
| Mnup to 1.65 in SS/HSLAS grades | ≤ 0.6 | 0.35 |
| P | ≤ 0.03 | 0.01 |
| S≤0.015 for HSLAS-F | ≤ 0.04 | 0.01 |
| Alaluminium-killed sheet | 0.01 – 0.1 | 0.04 |
| Cu0.20 min if copper-bearing ordered | ≤ 0.2 | 0.05 |
| Niunspecified-element limit | ≤ 0.2 | 0.02 |
| Crunspecified-element limit | ≤ 0.15 | 0.03 |
| Mounspecified-element limit | ≤ 0.06 | 0.01 |
| Nbmicroalloy addition in HSLAS/HSLAS-F only | ≤ 0.1 | — |
| TiIF (EDDS) stabilisation and HSLAS microalloying | ≤ 0.15 | — |
| VHSLAS microalloying | ≤ 0.1 | — |
| Fe | balance | — |
A1008 SS-45 — frequently asked
What is A1008 SS-45 used for?
A1008 SS-45 is typically used for stamped brackets, enclosures, automotive parts and appliance panels. In short: broadest US sheet spec; grades from EDDS to UHSS; SPCC/DC01 counterpart.
What is the yield strength of A1008 SS-45?
A1008 SS-45 has a typical yield strength of 340 MPa (49.3 ksi) and a tensile strength of 415 MPa (60.2 ksi) — weaker than 76% of steel grades. Strength varies by condition: see the 31 listed tempers.
Is A1008 SS-45 easy to machine?
Reasonably — machinability is rated good (57/100, better than 71% of steel grades). Soft and gummy — sharp tools, positive rake and good chip evacuation; blanking, laser and punching are the normal 'machining' routes for this thin sheet.
Can A1008 SS-45 be welded?
Yes — weldability is rated excellent (90/100). Excellent for RSW, MIG, TIG and laser with ER70S-x filler; no preheat or PWHT needed on CS/DS/DDS, but UHSS and high HSLAS grades need controlled heat input to limit HAZ softening.
What surface finishes work on A1008 SS-45?
Bare sheet must be protected: zinc/zinc-nickel plating, hot-dip galvanizing, zinc phosphate + e-coat, powder coat or oiling; it takes paint well after alkaline clean and phosphate.
Can A1008 SS-45 be formed, bent or molded?
Cold forming is the primary process — pick CS for bends, DS/DDS/EDDS as draw severity rises; watch stretcher strains/aging in non-killed CS and allow for springback in SS/HSLAS grades.
What is the maximum service temperature of A1008 SS-45?
A1008 SS-45 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 A1008 CS-B and A1008 UHSS?
CS-B is the default condition — the default stocked cold-rolled commercial sheet — best balance of price, weldability and moderate drawing. UHSS: quenched martensitic sheet for intrusion beams, bumpers and roll-formed profiles; essentially no drawability and needs careful welding. Yield strength is 240 MPa in CS-B versus 900 MPa in UHSS.
Sources
- ASTM A1008/A1008M Standard Specification for Steel, Sheet, Cold-Rolled, Carbon, Structural, High-Strength Low-Alloy, High-Strength Low-Alloy with Improved Formability, Solution Hardened, and Bake Hard — ASTM International (2021)
- JIS G 3141 Cold-reduced carbon steel sheets and strip (SPCC/SPCD/SPCE) — JISC (2021)
- EN 10130 Cold rolled low carbon steel flat products for cold forming (DC01–DC06) — CEN (2006)
- ASM Handbook Vol.1: Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.14B: Metalworking — Sheet Forming — ASM International (2006)
- Cold Rolled Steel Product Guides (CS/DS/DDS/EDDS, HSLAS, BH grades) — Cleveland-Cliffs / U.S. Steel / Nucor (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.