Steel SECC · finish state
Steel SECC Galvanized
Properties of the Galvanized condition, compared with the other SECC tempers.
Default stocked SECC coil/sheet: SPCC base, electroplated zinc both sides, chromate passivated, standard temper — general enclosure and bracket work.
What is SECC Galvanized?
SECC Galvanized is SECC supplied in the Galvanized condition — default stocked SECC coil/sheet: SPCC base, electroplated zinc both sides, chromate passivated, standard temper — general enclosure and bracket work. SECC Galvanized has a yield strength of 220 MPa (31.9 ksi) and a tensile strength of 305 MPa (44.2 ksi) — weaker than 98% of steel grades. Elongation at break is 38% and the elastic modulus is 205 GPa (29.7 Msi). SECC Galvanized has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,500°C (2,732 °F). HR is the default condition FabDigit quotes; Galvanized is available on request or by drawing note.
Advantages
- Ductile — tolerates forming and impact — 38%, better than 98% of steel grades
- Conducts heat well — 52 W/m·K (30 BTU/hr·ft·°F), better than 98% of steel grades
- High electrical conductivity — 11 % IACS, better than 98% of steel grades
- Forms and bends easily — 85/100, better than 96% of steel grades
- Good corrosion resistance — 30/100, better than 95% of steel grades
Limitations
- Hard to polish — 35/100, worse than 99% of steel grades
- Low strength — 220 MPa (31.9 ksi), worse than 98% 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
SECC Galvanized properties
Typical room-temperature values for SECC Galvanized — 8 properties are specific to this condition; the rest are grade-level values shared by every SECC temper. Each bar shows where the value sits among the steel grades in FabDigit's library — further right is higher.
Physical3
SECC Galvanized has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,500°C (2,732 °F).
Mechanical12
SECC Galvanized has a yield strength of 220 MPa (31.9 ksi) and a tensile strength of 305 MPa (44.2 ksi) — weaker than 98% of steel grades. Elongation at break is 38% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
SECC Galvanized is rated for continuous service to 200°C (392 °F). It conducts heat at 52 W/m·K (30 BTU/hr·ft·°F), better than 98% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
SECC Galvanized conducts electricity at 11 % IACS, better than 98% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (30/100), better than 95% of steel grades.
Sustainability4
Producing a kilogram of SECC Galvanized takes about 35 MJ of energy and emits 2.5 kg of CO₂ — more than 86% of steel grades. Typical recycled content is 25%.
Manufacturability7
SECC Galvanized's machinability is good (65/100, better than 93% of steel grades); weldability very good (80/100); formability excellent (85/100).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other SECC tempers and conditions
SECC is also supplied in 11 other conditions. The full side-by-side table is on the SECC overview.
- HRDefaultChoose hot-rolled stock when thickness and cost matter more than surface quality; tolerances and finish are coarser, with cold rolling or coating applied in later processing steps.summary only
- GalvanizedDefault stocked SECC coil/sheet: SPCC base, electroplated zinc both sides, chromate passivated, standard temper — general enclosure and bracket work.220 MPa yield · 45 HRB
Working with SECC Galvanized
Is SECC easy to machine?
Soft and gummy — punch, laser or shear rather than mill; use sharp tools, high rake and light feeds to avoid burrs and zinc smearing, and expect coating loss on all cut edges.
Can SECC be welded?
Excellent resistance spot/projection welding (use ~10–20 % higher current and more frequent tip dressing than bare CR); MIG/TIG needs fume extraction and post-weld zinc-rich touch-up because zinc burns off in the heat-affected zone.
Can SECC be formed, bent or molded?
Very good cold formability in A/S tempers — bends to 1T–2T, deep drawing possible in the soft temper; the zinc layer acts as a mild lubricant but heavy draws can flake it, so galling and die pick-up should be checked.
What surface finishes work on SECC?
Take as-supplied chromate or anti-fingerprint finish for indoor use; phosphate grade or a light alkaline clean plus conversion coat for powder coating; touch up cut edges, welds and drilled holes with zinc-rich primer for humid service.
SECC 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 |
|---|---|---|
| CSPCC base per JIS G3141 | ≤ 0.15 | 0.06 |
| Mn | ≤ 0.6 | 0.3 |
| P | ≤ 0.1 | 0.02 |
| S | ≤ 0.04 | 0.02 |
| Zn coatingElectroplated zinc, ≥99 % Zn; typical coating mass 20/20 g/m² per side (≈2.8 µm), range 8–40 g/m² per JIS G3313 designations E8–E40 | — | — |
| Febase steel | balance | — |
SECC Galvanized — frequently asked
What is SECC Galvanized used for?
SECC Galvanized is typically used for industrial enclosures, computer and server chassis, electrical cabinets and panels, appliance side and back panels, mounting brackets and trays and rack-mount hardware. In short: electro-galvanized commercial coil.
What is the yield strength of SECC Galvanized?
SECC Galvanized has a typical yield strength of 220 MPa (31.9 ksi) and a tensile strength of 305 MPa (44.2 ksi) — weaker than 98% of steel grades. Strength varies by condition: see the 12 listed tempers.
Is SECC Galvanized easy to machine?
Reasonably — machinability is rated good (65/100, better than 93% of steel grades). Soft and gummy — punch, laser or shear rather than mill; use sharp tools, high rake and light feeds to avoid burrs and zinc smearing, and expect coating loss on all cut edges.
Can SECC Galvanized be welded?
Yes — weldability is rated very good (80/100). Excellent resistance spot/projection welding (use ~10–20 % higher current and more frequent tip dressing than bare CR); MIG/TIG needs fume extraction and post-weld zinc-rich touch-up because zinc burns off in the heat-affected zone.
What surface finishes work on SECC Galvanized?
Take as-supplied chromate or anti-fingerprint finish for indoor use; phosphate grade or a light alkaline clean plus conversion coat for powder coating; touch up cut edges, welds and drilled holes with zinc-rich primer for humid service.
Can SECC Galvanized be formed, bent or molded?
Very good cold formability in A/S tempers — bends to 1T–2T, deep drawing possible in the soft temper; the zinc layer acts as a mild lubricant but heavy draws can flake it, so galling and die pick-up should be checked.
What is the maximum service temperature of SECC Galvanized?
SECC Galvanized 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 SECC-HR and SECC-1?
HR is the default condition — choose hot-rolled stock when thickness and cost matter more than surface quality; tolerances and finish are coarser, with cold rolling or coating applied in later processing steps. SECC-1: full-hard as-rolled temper — highest strength and flatness, essentially only for flat blanks, shearing and very light forming. Yield strength is 220 MPa in HR versus 540 MPa in SECC-1.
Can FabDigit make parts in SECC Galvanized?
Yes — SECC Galvanized is available for sheet metal with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- JIS G 3313 — Electrolytic zinc-coated steel sheet and strip — JSA (2021)
- JIS G 3141 — Cold-reduced carbon steel sheet and strip (SPCC base) — JSA (2021)
- GB/T 15675 / GB/T 5213 equivalents for — SAC (2020)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials (zinc coatings) — ASM International (2005)
- Electro-galvanized coil (SECC/SECC-N/SECC-AF) product data — Nippon Steel / POSCO / 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.