Steel SGCC · finish state
Steel SGCC Galvanized
Properties of the Galvanized condition, compared with the other SGCC tempers.
Default stocked SGCC condition: CR base + continuous hot-dip zinc, chromate-passivated and oiled, for indoor cabinets, ducts and brackets.
What is SGCC Galvanized?
SGCC Galvanized is SGCC supplied in the Galvanized condition — default stocked SGCC condition: CR base + continuous hot-dip zinc, chromate-passivated and oiled, for indoor cabinets, ducts and brackets. SGCC Galvanized has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 320 MPa (46.4 ksi) — weaker than 96% of steel grades. Elongation at break is 34% and the elastic modulus is 205 GPa (29.7 Msi). SGCC 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
- Conducts heat well — 52 W/m·K (30 BTU/hr·ft·°F), better than 98% of steel grades
- Good corrosion resistance — 35/100, better than 97% of steel grades
- Ductile — tolerates forming and impact — 34%, better than 96% of steel grades
- Easy to machine — 70/100, better than 96% of steel grades
- Forms and bends easily — 82/100, better than 94% of steel grades
Limitations
- Hard to polish — 30/100, worse than 100% of steel grades
- Low strength — 240 MPa (34.8 ksi), worse than 96% of steel grades
- Limited service temperature — 200°C (392 °F), worse than 93% of steel grades
SGCC Galvanized properties
Typical room-temperature values for SGCC Galvanized — 8 properties are specific to this condition; the rest are grade-level values shared by every SGCC temper. Each bar shows where the value sits among the steel grades in FabDigit's library — further right is higher.
Physical3
SGCC 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).
Mechanical13
SGCC Galvanized has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 320 MPa (46.4 ksi) — weaker than 96% of steel grades. Elongation at break is 34% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
SGCC 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
SGCC Galvanized conducts electricity at 10.5 % IACS, better than 89% of steel grades.
Chemical & Environmental3
Corrosion resistance is fair (35/100), better than 97% of steel grades.
Sustainability4
Producing a kilogram of SGCC Galvanized takes about 32 MJ of energy and emits 2.4 kg of CO₂ — more than 70% of steel grades. Typical recycled content is 25%.
Manufacturability7
SGCC Galvanized's machinability is very good (70/100, better than 96% of steel grades); weldability very good (72/100); formability very good (82/100).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other SGCC tempers and conditions
SGCC is also supplied in 12 other conditions. The full side-by-side table is on the SGCC overview.
- HRDefaultHot-rolled pickled substrate used for thicker galvanized coil (JIS designates it SGHC); pick for >2 mm ducting and structural brackets where surface finish is secondary.250 MPa yield · 58 HRB
- GalvanizedDefault stocked SGCC condition: CR base + continuous hot-dip zinc, chromate-passivated and oiled, for indoor cabinets, ducts and brackets.240 MPa yield · 55 HRB
- CRThe annealed cold-rolled substrate SGCC is made from; quoted when the coating is stripped, laser-cut edges dominate, or SPCC-equivalent base properties are needed.210 MPa yield · 50 HRB
Working with SGCC Galvanized
Is SGCC easy to machine?
Rarely machined — punch, laser or plasma cut; use sharp tooling and light lubrication to avoid burrs and zinc pick-up, and expect zinc dust extraction on laser lines.
Can SGCC be welded?
Excellent resistance spot/seam weldability with ~20–30 % higher current and more frequent tip dressing; for MIG use ER70S-6 with wider gap/slower travel to vent zinc, ventilate for zinc-oxide fume, and re-protect welds with zinc-rich paint.
Can SGCC be formed, bent or molded?
Good bending, roll forming and shallow drawing (commercial quality only — use SGCD1/SGCE for deep draws); keep bend radii ≥1t and coating side outward, heavy Z27 coating can powder on tight bends.
What surface finishes work on SGCC?
Do not anodize; degrease and remove passivation oil, then phosphate or Cr-free pretreat before powder coat / PCM paint; cut edges self-heal only a few mm so paint or seal exposed edges in wet service.
SGCC 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 |
|---|---|---|
| CJIS G3302 SGCC ladle analysis limit | ≤ 0.15 | 0.06 |
| Mn | ≤ 0.8 | 0.3 |
| P | ≤ 0.05 | 0.02 |
| S | ≤ 0.05 | 0.02 |
| Zn (coating)hot-dip coating; bath contains 0.15–0.25 % Al for coating adhesion; coating mass per Z-class | ≥ 99 | 99.5 |
| Febase steel balance | balance | — |
SGCC Galvanized — frequently asked
What is SGCC Galvanized used for?
SGCC Galvanized is typically used for electrical enclosures and cabinets, appliance housings and panels, HVAC ventilation ductwork, brackets and mounting plates, roof decking and industrial siding. In short: galvanized commercial coil.
What is the yield strength of SGCC Galvanized?
SGCC Galvanized has a typical yield strength of 240 MPa (34.8 ksi) and a tensile strength of 320 MPa (46.4 ksi) — weaker than 96% of steel grades. Strength varies by condition: see the 13 listed tempers.
Is SGCC Galvanized easy to machine?
Yes — machinability is rated very good (70/100, better than 96% of steel grades). Rarely machined — punch, laser or plasma cut; use sharp tooling and light lubrication to avoid burrs and zinc pick-up, and expect zinc dust extraction on laser lines.
Can SGCC Galvanized be welded?
Yes — weldability is rated very good (72/100). Excellent resistance spot/seam weldability with ~20–30 % higher current and more frequent tip dressing; for MIG use ER70S-6 with wider gap/slower travel to vent zinc, ventilate for zinc-oxide fume, and re-protect welds with zinc-rich paint.
What surface finishes work on SGCC Galvanized?
Do not anodize; degrease and remove passivation oil, then phosphate or Cr-free pretreat before powder coat / PCM paint; cut edges self-heal only a few mm so paint or seal exposed edges in wet service.
Can SGCC Galvanized be formed, bent or molded?
Good bending, roll forming and shallow drawing (commercial quality only — use SGCD1/SGCE for deep draws); keep bend radii ≥1t and coating side outward, heavy Z27 coating can powder on tight bends.
What is the maximum service temperature of SGCC Galvanized?
SGCC 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 SGCC-HR and SGCC-CR?
HR is the default condition — hot-rolled pickled substrate used for thicker galvanized coil (JIS designates it SGHC); pick for >2 mm ducting and structural brackets where surface finish is secondary. CR: the annealed cold-rolled substrate SGCC is made from; quoted when the coating is stripped, laser-cut edges dominate, or SPCC-equivalent base properties are needed. Yield strength is 250 MPa in HR versus 210 MPa in CR.
Can FabDigit make parts in SGCC Galvanized?
Yes — SGCC 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 3302 — Hot-dip zinc-coated steel sheet and strip — JSA (2019)
- ASTM A653/A653M — Steel Sheet, Zinc-Coated (Galvanized) by the Hot-Dip Process — ASTM (2023)
- Hot-dip galvanized steel sheet (GI) product guide — Nippon Steel (2022)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels — ASM International (1990)
- Zinc Coatings / Performance in Service — American Galvanizers Association (2019)
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.